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 // Copyright (c) 2010 Google Inc.

 // All rights reserved.

 //

 // Redistribution and use in source and binary forms, with or without

 // modification, are permitted provided that the following conditions are

 // met:

 //

 //     * Redistributions of source code must retain the above copyright

 // notice, this list of conditions and the following disclaimer.

 //     * Redistributions in binary form must reproduce the above

 // copyright notice, this list of conditions and the following disclaimer

 // in the documentation and/or other materials provided with the

 // distribution.

 //     * Neither the name of Google Inc. nor the names of its

 // contributors may be used to endorse or promote products derived from

 // this software without specific prior written permission.

 //

 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 // minidump.cc: A minidump reader.

 //

 // See minidump.h for documentation.

 //

 // Author: Mark Mentovai

 #include "google_breakpad/processor/minidump.h"

 #include <assert.h>

 #include <fcntl.h>

 #include <stddef.h>

 #include <stdio.h>

 #include <string.h>

 #include <time.h>

 #ifdef _WIN32

 #include <io.h>

 #define PRIx64 "llx"

 #define PRIx32 "lx"

 #define snprintf _snprintf

 #else  // _WIN32

 #include <unistd.h>

 #define O_BINARY 0

 #endif  // _WIN32

 #include <fstream>

 #include <iostream>

 #include <limits>

 #include <map>

 #include <vector>

 #include "processor/range_map-inl.h"

 #include "common/scoped_ptr.h"

 #include "processor/basic_code_module.h"

 #include "processor/basic_code_modules.h"

 #include "common/logging.h"

 namespace google_breakpad {

 using std::istream;

 using std::ifstream;

 using std::numeric_limits;

 using std::vector;

 //

 // Swapping routines

 //

 // Inlining these doesn't increase code size significantly, and it saves

 // a whole lot of unnecessary jumping back and forth.

 //

 // Swapping an 8-bit quantity is a no-op.  This function is only provided

 // to account for certain templatized operations that require swapping for

 // wider types but handle uint8_t too

 // (MinidumpMemoryRegion::GetMemoryAtAddressInternal).

 static inline void Swap(uint8_t* value) {

 }

 // Optimization: don't need to AND the furthest right shift, because we're

 // shifting an unsigned quantity.  The standard requires zero-filling in this

 // case.  If the quantities were signed, a bitmask whould be needed for this

 // right shift to avoid an arithmetic shift (which retains the sign bit).

 // The furthest left shift never needs to be ANDed bitmask.

 static inline void Swap(uint16_t* value) {

   *value = (*value >> 8) |

            (*value << 8);

 }

 static inline void Swap(uint32_t* value) {

   *value =  (*value >> 24) |

            ((*value >> 8)  & 0x0000ff00) |

            ((*value << 8)  & 0x00ff0000) |

             (*value << 24);

 }

 static inline void Swap(uint64_t* value) {

   uint32_t* value32 = reinterpret_cast<uint32_t*>(value);

   Swap(&value32[0]);

   Swap(&value32[1]);

   uint32_t temp = value32[0];

   value32[0] = value32[1];

   value32[1] = temp;

 }

 // Given a pointer to a 128-bit int in the minidump data, set the "low"

 // and "high" fields appropriately.

 static void Normalize128(uint128_struct* value, bool is_big_endian) {

   // The struct format is [high, low], so if the format is big-endian,

   // the most significant bytes will already be in the high field.

   if (!is_big_endian) {

     uint64_t temp = value->low;

     value->low = value->high;

     value->high = temp;

   }

 }

 // This just swaps each int64 half of the 128-bit value.

 // The value should also be normalized by calling Normalize128().

 static void Swap(uint128_struct* value) {

   Swap(&value->low);

   Swap(&value->high);

 }

 static inline void Swap(MDLocationDescriptor* location_descriptor) {

   Swap(&location_descriptor->data_size);

   Swap(&location_descriptor->rva);

 }

 static inline void Swap(MDMemoryDescriptor* memory_descriptor) {

   Swap(&memory_descriptor->start_of_memory_range);

   Swap(&memory_descriptor->memory);

 }

 static inline void Swap(MDGUID* guid) {

   Swap(&guid->data1);

   Swap(&guid->data2);

   Swap(&guid->data3);

   // Don't swap guid->data4[] because it contains 8-bit quantities.

 }

 //

 // Character conversion routines

 //

 // Standard wide-character conversion routines depend on the system's own

 // idea of what width a wide character should be: some use 16 bits, and

 // some use 32 bits.  For the purposes of a minidump, wide strings are

 // always represented with 16-bit UTF-16 chracters.  iconv isn't available

 // everywhere, and its interface varies where it is available.  iconv also

 // deals purely with char* pointers, so in addition to considering the swap

 // parameter, a converter that uses iconv would also need to take the host

 // CPU's endianness into consideration.  It doesn't seems worth the trouble

 // of making it a dependency when we don't care about anything but UTF-16.

 static string* UTF16ToUTF8(const vector<uint16_t>& in,

                            bool                     swap) {

   scoped_ptr<string> out(new string());

   // Set the string's initial capacity to the number of UTF-16 characters,

   // because the UTF-8 representation will always be at least this long.

   // If the UTF-8 representation is longer, the string will grow dynamically.

   out->reserve(in.size());

   for (vector<uint16_t>::const_iterator iterator = in.begin();

        iterator != in.end();

        ++iterator) {

     // Get a 16-bit value from the input

     uint16_t in_word = *iterator;

     if (swap)

       Swap(&in_word);

     // Convert the input value (in_word) into a Unicode code point (unichar).

     uint32_t unichar;

     if (in_word >= 0xdc00 && in_word <= 0xdcff) {

       BPLOG(ERROR) << "UTF16ToUTF8 found low surrogate " <<

                       HexString(in_word) << " without high";

       return NULL;

     } else if (in_word >= 0xd800 && in_word <= 0xdbff) {

       // High surrogate.

       unichar = (in_word - 0xd7c0) << 10;

       if (++iterator == in.end()) {

         BPLOG(ERROR) << "UTF16ToUTF8 found high surrogate " <<

                         HexString(in_word) << " at end of string";

         return NULL;

       }

       uint32_t high_word = in_word;

       in_word = *iterator;

       if (in_word < 0xdc00 || in_word > 0xdcff) {

         BPLOG(ERROR) << "UTF16ToUTF8 found high surrogate " <<

                         HexString(high_word) << " without low " <<

                         HexString(in_word);

         return NULL;

       }

       unichar |= in_word & 0x03ff;

     } else {

       // The ordinary case, a single non-surrogate Unicode character encoded

       // as a single 16-bit value.

       unichar = in_word;

     }

     // Convert the Unicode code point (unichar) into its UTF-8 representation,

     // appending it to the out string.

     if (unichar < 0x80) {

       (*out) += unichar;

     } else if (unichar < 0x800) {

       (*out) += 0xc0 | (unichar >> 6);

       (*out) += 0x80 | (unichar & 0x3f);

     } else if (unichar < 0x10000) {

       (*out) += 0xe0 | (unichar >> 12);

       (*out) += 0x80 | ((unichar >> 6) & 0x3f);

       (*out) += 0x80 | (unichar & 0x3f);

     } else if (unichar < 0x200000) {

       (*out) += 0xf0 | (unichar >> 18);

       (*out) += 0x80 | ((unichar >> 12) & 0x3f);

       (*out) += 0x80 | ((unichar >> 6) & 0x3f);

       (*out) += 0x80 | (unichar & 0x3f);

     } else {

       BPLOG(ERROR) << "UTF16ToUTF8 cannot represent high value " <<

                       HexString(unichar) << " in UTF-8";

       return NULL;

     }

   }

   return out.release();

 }

 // Return the smaller of the number of code units in the UTF-16 string,

 // not including the terminating null word, or maxlen.

 static size_t UTF16codeunits(const uint16_t *string, size_t maxlen) {

   size_t count = 0;

   while (count < maxlen && string[count] != 0)

     count++;

   return count;

 }

 //

 // MinidumpObject

 //

 MinidumpObject::MinidumpObject(Minidump* minidump)

     : minidump_(minidump),

       valid_(false) {

 }

 //

 // MinidumpStream

 //

 MinidumpStream::MinidumpStream(Minidump* minidump)

     : MinidumpObject(minidump) {

 }

 //

 // MinidumpContext

 //

 MinidumpContext::MinidumpContext(Minidump* minidump)

     : MinidumpStream(minidump),

       context_(),

       context_flags_(0) {

 }

 MinidumpContext::~MinidumpContext() {

   FreeContext();

 }

 bool MinidumpContext::Read(uint32_t expected_size) {

   valid_ = false;

   FreeContext();

   // First, figure out what type of CPU this context structure is for.

   // For some reason, the AMD64 Context doesn't have context_flags

   // at the beginning of the structure, so special case it here.

   if (expected_size == sizeof(MDRawContextAMD64)) {

     BPLOG(INFO) << "MinidumpContext: looks like AMD64 context";

     scoped_ptr<MDRawContextAMD64> context_amd64(new MDRawContextAMD64());

     if (!minidump_->ReadBytes(context_amd64.get(),

                               sizeof(MDRawContextAMD64))) {

       BPLOG(ERROR) << "MinidumpContext could not read amd64 context";

       return false;

     }

     if (minidump_->swap())

       Swap(&context_amd64->context_flags);

     uint32_t cpu_type = context_amd64->context_flags & MD_CONTEXT_CPU_MASK;

     if (cpu_type == 0) {

       if (minidump_->GetContextCPUFlagsFromSystemInfo(&cpu_type)) {

         context_amd64->context_flags |= cpu_type;

       } else {

         BPLOG(ERROR) << "Failed to preserve the current stream position";

         return false;

       }

     }

     if (cpu_type != MD_CONTEXT_AMD64) {

       //TODO: fall through to switch below?

       // need a Tell method to be able to SeekSet back to beginning

       // http://code.google.com/p/google-breakpad/issues/detail?id=224

       BPLOG(ERROR) << "MinidumpContext not actually amd64 context";

       return false;

     }

     // Do this after reading the entire MDRawContext structure because

     // GetSystemInfo may seek minidump to a new position.

     if (!CheckAgainstSystemInfo(cpu_type)) {

       BPLOG(ERROR) << "MinidumpContext amd64 does not match system info";

       return false;

     }

     // Normalize the 128-bit types in the dump.

     // Since this is AMD64, by definition, the values are little-endian.

     for (unsigned int vr_index = 0;

          vr_index < MD_CONTEXT_AMD64_VR_COUNT;

          ++vr_index)

       Normalize128(&context_amd64->vector_register[vr_index], false);

     if (minidump_->swap()) {

       Swap(&context_amd64->p1_home);

       Swap(&context_amd64->p2_home);

       Swap(&context_amd64->p3_home);

       Swap(&context_amd64->p4_home);

       Swap(&context_amd64->p5_home);

       Swap(&context_amd64->p6_home);

       // context_flags is already swapped

       Swap(&context_amd64->mx_csr);

       Swap(&context_amd64->cs);

       Swap(&context_amd64->ds);

       Swap(&context_amd64->es);

       Swap(&context_amd64->fs);

       Swap(&context_amd64->ss);

       Swap(&context_amd64->eflags);

       Swap(&context_amd64->dr0);

       Swap(&context_amd64->dr1);

       Swap(&context_amd64->dr2);

       Swap(&context_amd64->dr3);

       Swap(&context_amd64->dr6);

       Swap(&context_amd64->dr7);

       Swap(&context_amd64->rax);

       Swap(&context_amd64->rcx);

       Swap(&context_amd64->rdx);

       Swap(&context_amd64->rbx);

       Swap(&context_amd64->rsp);

       Swap(&context_amd64->rbp);

       Swap(&context_amd64->rsi);

       Swap(&context_amd64->rdi);

       Swap(&context_amd64->r8);

       Swap(&context_amd64->r9);

       Swap(&context_amd64->r10);

       Swap(&context_amd64->r11);

       Swap(&context_amd64->r12);

       Swap(&context_amd64->r13);

       Swap(&context_amd64->r14);

       Swap(&context_amd64->r15);

       Swap(&context_amd64->rip);

       //FIXME: I'm not sure what actually determines

       // which member of the union {flt_save, sse_registers}

       // is valid.  We're not currently using either,

       // but it would be good to have them swapped properly.

       for (unsigned int vr_index = 0;

            vr_index < MD_CONTEXT_AMD64_VR_COUNT;

            ++vr_index)

         Swap(&context_amd64->vector_register[vr_index]);

       Swap(&context_amd64->vector_control);

       Swap(&context_amd64->debug_control);

       Swap(&context_amd64->last_branch_to_rip);

       Swap(&context_amd64->last_branch_from_rip);

       Swap(&context_amd64->last_exception_to_rip);

       Swap(&context_amd64->last_exception_from_rip);

     }

     context_flags_ = context_amd64->context_flags;

     context_.amd64 = context_amd64.release();

   }

   else {

     uint32_t context_flags;

     if (!minidump_->ReadBytes(&context_flags, sizeof(context_flags))) {

       BPLOG(ERROR) << "MinidumpContext could not read context flags";

       return false;

     }

     if (minidump_->swap())

       Swap(&context_flags);

     uint32_t cpu_type = context_flags & MD_CONTEXT_CPU_MASK;

     if (cpu_type == 0) {

       // Unfortunately the flag for MD_CONTEXT_ARM that was taken

       // from a Windows CE SDK header conflicts in practice with

       // the CONTEXT_XSTATE flag. MD_CONTEXT_ARM has been renumbered,

       // but handle dumps with the legacy value gracefully here.

       if (context_flags & MD_CONTEXT_ARM_OLD) {

         context_flags |= MD_CONTEXT_ARM;

         context_flags &= ~MD_CONTEXT_ARM_OLD;

         cpu_type = MD_CONTEXT_ARM;

       }

     }

     if (cpu_type == 0) {

       if (minidump_->GetContextCPUFlagsFromSystemInfo(&cpu_type)) {

         context_flags |= cpu_type;

       } else {

         BPLOG(ERROR) << "Failed to preserve the current stream position";

         return false;

       }

     }

     // Allocate the context structure for the correct CPU and fill it.  The

     // casts are slightly unorthodox, but it seems better to do that than to

     // maintain a separate pointer for each type of CPU context structure

     // when only one of them will be used.

     switch (cpu_type) {

       case MD_CONTEXT_X86: {

         if (expected_size != sizeof(MDRawContextX86)) {

           BPLOG(ERROR) << "MinidumpContext x86 size mismatch, " <<

             expected_size << " != " << sizeof(MDRawContextX86);

           return false;

         }

         scoped_ptr<MDRawContextX86> context_x86(new MDRawContextX86());

         // Set the context_flags member, which has already been read, and

         // read the rest of the structure beginning with the first member

         // after context_flags.

         context_x86->context_flags = context_flags;

         size_t flags_size = sizeof(context_x86->context_flags);

         uint8_t* context_after_flags =

           reinterpret_cast<uint8_t*>(context_x86.get()) + flags_size;

         if (!minidump_->ReadBytes(context_after_flags,

                                   sizeof(MDRawContextX86) - flags_size)) {

           BPLOG(ERROR) << "MinidumpContext could not read x86 context";

           return false;

         }

         // Do this after reading the entire MDRawContext structure because

         // GetSystemInfo may seek minidump to a new position.

         if (!CheckAgainstSystemInfo(cpu_type)) {

           BPLOG(ERROR) << "MinidumpContext x86 does not match system info";

           return false;

         }

         if (minidump_->swap()) {

           // context_x86->context_flags was already swapped.

           Swap(&context_x86->dr0);

           Swap(&context_x86->dr1);

           Swap(&context_x86->dr2);

           Swap(&context_x86->dr3);

           Swap(&context_x86->dr6);

           Swap(&context_x86->dr7);

           Swap(&context_x86->float_save.control_word);

           Swap(&context_x86->float_save.status_word);

           Swap(&context_x86->float_save.tag_word);

           Swap(&context_x86->float_save.error_offset);

           Swap(&context_x86->float_save.error_selector);

           Swap(&context_x86->float_save.data_offset);

           Swap(&context_x86->float_save.data_selector);

           // context_x86->float_save.register_area[] contains 8-bit quantities

           // and does not need to be swapped.

           Swap(&context_x86->float_save.cr0_npx_state);

           Swap(&context_x86->gs);

           Swap(&context_x86->fs);

           Swap(&context_x86->es);

           Swap(&context_x86->ds);

           Swap(&context_x86->edi);

           Swap(&context_x86->esi);

           Swap(&context_x86->ebx);

           Swap(&context_x86->edx);

           Swap(&context_x86->ecx);

           Swap(&context_x86->eax);

           Swap(&context_x86->ebp);

           Swap(&context_x86->eip);

           Swap(&context_x86->cs);

           Swap(&context_x86->eflags);

           Swap(&context_x86->esp);

           Swap(&context_x86->ss);

           // context_x86->extended_registers[] contains 8-bit quantities and

           // does not need to be swapped.

         }

         context_.x86 = context_x86.release();

         break;

       }

       case MD_CONTEXT_PPC: {

         if (expected_size != sizeof(MDRawContextPPC)) {

           BPLOG(ERROR) << "MinidumpContext ppc size mismatch, " <<

             expected_size << " != " << sizeof(MDRawContextPPC);

           return false;

         }

         scoped_ptr<MDRawContextPPC> context_ppc(new MDRawContextPPC());

         // Set the context_flags member, which has already been read, and

         // read the rest of the structure beginning with the first member

         // after context_flags.

         context_ppc->context_flags = context_flags;

         size_t flags_size = sizeof(context_ppc->context_flags);

         uint8_t* context_after_flags =

           reinterpret_cast<uint8_t*>(context_ppc.get()) + flags_size;

         if (!minidump_->ReadBytes(context_after_flags,

                                   sizeof(MDRawContextPPC) - flags_size)) {

           BPLOG(ERROR) << "MinidumpContext could not read ppc context";

           return false;

         }

         // Do this after reading the entire MDRawContext structure because

         // GetSystemInfo may seek minidump to a new position.

         if (!CheckAgainstSystemInfo(cpu_type)) {

           BPLOG(ERROR) << "MinidumpContext ppc does not match system info";

           return false;

         }

         // Normalize the 128-bit types in the dump.

         // Since this is PowerPC, by definition, the values are big-endian.

         for (unsigned int vr_index = 0;

              vr_index < MD_VECTORSAVEAREA_PPC_VR_COUNT;

              ++vr_index) {

           Normalize128(&context_ppc->vector_save.save_vr[vr_index], true);

         }

         if (minidump_->swap()) {

           // context_ppc->context_flags was already swapped.

           Swap(&context_ppc->srr0);

           Swap(&context_ppc->srr1);

           for (unsigned int gpr_index = 0;

                gpr_index < MD_CONTEXT_PPC_GPR_COUNT;

                ++gpr_index) {

             Swap(&context_ppc->gpr[gpr_index]);

           }

           Swap(&context_ppc->cr);

           Swap(&context_ppc->xer);

           Swap(&context_ppc->lr);

           Swap(&context_ppc->ctr);

           Swap(&context_ppc->mq);

           Swap(&context_ppc->vrsave);

           for (unsigned int fpr_index = 0;

                fpr_index < MD_FLOATINGSAVEAREA_PPC_FPR_COUNT;

                ++fpr_index) {

             Swap(&context_ppc->float_save.fpregs[fpr_index]);

           }

           // Don't swap context_ppc->float_save.fpscr_pad because it is only

           // used for padding.

           Swap(&context_ppc->float_save.fpscr);

           for (unsigned int vr_index = 0;

                vr_index < MD_VECTORSAVEAREA_PPC_VR_COUNT;

                ++vr_index) {

             Swap(&context_ppc->vector_save.save_vr[vr_index]);

           }

           Swap(&context_ppc->vector_save.save_vscr);

           // Don't swap the padding fields in vector_save.

           Swap(&context_ppc->vector_save.save_vrvalid);

         }

         context_.ppc = context_ppc.release();

         break;

       }

       case MD_CONTEXT_SPARC: {

         if (expected_size != sizeof(MDRawContextSPARC)) {

           BPLOG(ERROR) << "MinidumpContext sparc size mismatch, " <<

             expected_size << " != " << sizeof(MDRawContextSPARC);

           return false;

         }

         scoped_ptr<MDRawContextSPARC> context_sparc(new MDRawContextSPARC());

         // Set the context_flags member, which has already been read, and

         // read the rest of the structure beginning with the first member

         // after context_flags.

         context_sparc->context_flags = context_flags;

         size_t flags_size = sizeof(context_sparc->context_flags);

         uint8_t* context_after_flags =

             reinterpret_cast<uint8_t*>(context_sparc.get()) + flags_size;

         if (!minidump_->ReadBytes(context_after_flags,

                                   sizeof(MDRawContextSPARC) - flags_size)) {

           BPLOG(ERROR) << "MinidumpContext could not read sparc context";

           return false;

         }

         // Do this after reading the entire MDRawContext structure because

         // GetSystemInfo may seek minidump to a new position.

         if (!CheckAgainstSystemInfo(cpu_type)) {

           BPLOG(ERROR) << "MinidumpContext sparc does not match system info";

           return false;

         }

         if (minidump_->swap()) {

           // context_sparc->context_flags was already swapped.

           for (unsigned int gpr_index = 0;

                gpr_index < MD_CONTEXT_SPARC_GPR_COUNT;

                ++gpr_index) {

             Swap(&context_sparc->g_r[gpr_index]);

           }

           Swap(&context_sparc->ccr);

           Swap(&context_sparc->pc);

           Swap(&context_sparc->npc);

           Swap(&context_sparc->y);

           Swap(&context_sparc->asi);

           Swap(&context_sparc->fprs);

           for (unsigned int fpr_index = 0;

                fpr_index < MD_FLOATINGSAVEAREA_SPARC_FPR_COUNT;

                ++fpr_index) {

             Swap(&context_sparc->float_save.regs[fpr_index]);

           }

           Swap(&context_sparc->float_save.filler);

           Swap(&context_sparc->float_save.fsr);

         }

         context_.ctx_sparc = context_sparc.release();

         break;

       }

       case MD_CONTEXT_ARM: {

         if (expected_size != sizeof(MDRawContextARM)) {

           BPLOG(ERROR) << "MinidumpContext arm size mismatch, " <<

             expected_size << " != " << sizeof(MDRawContextARM);

           return false;

         }

         scoped_ptr<MDRawContextARM> context_arm(new MDRawContextARM());

         // Set the context_flags member, which has already been read, and

         // read the rest of the structure beginning with the first member

         // after context_flags.

         context_arm->context_flags = context_flags;

         size_t flags_size = sizeof(context_arm->context_flags);

         uint8_t* context_after_flags =

             reinterpret_cast<uint8_t*>(context_arm.get()) + flags_size;

         if (!minidump_->ReadBytes(context_after_flags,

                                   sizeof(MDRawContextARM) - flags_size)) {

           BPLOG(ERROR) << "MinidumpContext could not read arm context";

           return false;

         }

         // Do this after reading the entire MDRawContext structure because

         // GetSystemInfo may seek minidump to a new position.

         if (!CheckAgainstSystemInfo(cpu_type)) {

           BPLOG(ERROR) << "MinidumpContext arm does not match system info";

           return false;

         }

         if (minidump_->swap()) {

           // context_arm->context_flags was already swapped.

           for (unsigned int ireg_index = 0;

                ireg_index < MD_CONTEXT_ARM_GPR_COUNT;

                ++ireg_index) {

             Swap(&context_arm->iregs[ireg_index]);

           }

           Swap(&context_arm->cpsr);

           Swap(&context_arm->float_save.fpscr);

           for (unsigned int fpr_index = 0;

                fpr_index < MD_FLOATINGSAVEAREA_ARM_FPR_COUNT;

                ++fpr_index) {

             Swap(&context_arm->float_save.regs[fpr_index]);

           }

           for (unsigned int fpe_index = 0;

                fpe_index < MD_FLOATINGSAVEAREA_ARM_FPEXTRA_COUNT;

                ++fpe_index) {

             Swap(&context_arm->float_save.extra[fpe_index]);

           }

         }

         context_.arm = context_arm.release();

         break;

       }

       default: {

         // Unknown context type - Don't log as an error yet. Let the

         // caller work that out.

         BPLOG(INFO) << "MinidumpContext unknown context type " <<

           HexString(cpu_type);

         return false;

         break;

       }

     }

     context_flags_ = context_flags;

   }

   valid_ = true;

   return true;

 }

 uint32_t MinidumpContext::GetContextCPU() const {

   if (!valid_) {

     // Don't log a message, GetContextCPU can be legitimately called with

     // valid_ false by FreeContext, which is called by Read.

     return 0;

   }

   return context_flags_ & MD_CONTEXT_CPU_MASK;

 }

 bool MinidumpContext::GetInstructionPointer(uint64_t* ip) const {

   BPLOG_IF(ERROR, !ip) << "MinidumpContext::GetInstructionPointer "

                           "requires |ip|";

   assert(ip);

   *ip = 0;

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpContext for GetInstructionPointer";

     return false;

   }

   switch (context_flags_ & MD_CONTEXT_CPU_MASK) {

   case MD_CONTEXT_AMD64:

     *ip = context_.amd64->rip;

     break;

   case MD_CONTEXT_ARM:

     *ip = context_.arm->iregs[MD_CONTEXT_ARM_REG_PC];

     break;

   case MD_CONTEXT_PPC:

     *ip = context_.ppc->srr0;

     break;

   case MD_CONTEXT_SPARC:

     *ip = context_.ctx_sparc->pc;

     break;

   case MD_CONTEXT_X86:

     *ip = context_.x86->eip;

     break;

   default:

     // This should never happen.

     BPLOG(ERROR) << "Unknown CPU architecture in GetInstructionPointer";

     return false;

   }

   return true;

 }

 const MDRawContextX86* MinidumpContext::GetContextX86() const {

   if (GetContextCPU() != MD_CONTEXT_X86) {

     BPLOG(ERROR) << "MinidumpContext cannot get x86 context";

     return NULL;

   }

   return context_.x86;

 }

 const MDRawContextPPC* MinidumpContext::GetContextPPC() const {

   if (GetContextCPU() != MD_CONTEXT_PPC) {

     BPLOG(ERROR) << "MinidumpContext cannot get ppc context";

     return NULL;

   }

   return context_.ppc;

 }

 const MDRawContextAMD64* MinidumpContext::GetContextAMD64() const {

   if (GetContextCPU() != MD_CONTEXT_AMD64) {

     BPLOG(ERROR) << "MinidumpContext cannot get amd64 context";

     return NULL;

   }

   return context_.amd64;

 }

 const MDRawContextSPARC* MinidumpContext::GetContextSPARC() const {

   if (GetContextCPU() != MD_CONTEXT_SPARC) {

     BPLOG(ERROR) << "MinidumpContext cannot get sparc context";

     return NULL;

   }

   return context_.ctx_sparc;

 }

 const MDRawContextARM* MinidumpContext::GetContextARM() const {

   if (GetContextCPU() != MD_CONTEXT_ARM) {

     BPLOG(ERROR) << "MinidumpContext cannot get arm context";

     return NULL;

   }

   return context_.arm;

 }

 void MinidumpContext::FreeContext() {

   switch (GetContextCPU()) {

     case MD_CONTEXT_X86:

       delete context_.x86;

       break;

     case MD_CONTEXT_PPC:

       delete context_.ppc;

       break;

     case MD_CONTEXT_AMD64:

       delete context_.amd64;

       break;

     case MD_CONTEXT_SPARC:

       delete context_.ctx_sparc;

       break;

     case MD_CONTEXT_ARM:

       delete context_.arm;

       break;

     default:

       // There is no context record (valid_ is false) or there's a

       // context record for an unknown CPU (shouldn't happen, only known

       // records are stored by Read).

       break;

   }

   context_flags_ = 0;

   context_.base = NULL;

 }

 bool MinidumpContext::CheckAgainstSystemInfo(uint32_t context_cpu_type) {

   // It's OK if the minidump doesn't contain an MD_SYSTEM_INFO_STREAM,

   // as this function just implements a sanity check.

   MinidumpSystemInfo* system_info = minidump_->GetSystemInfo();

   if (!system_info) {

     BPLOG(INFO) << "MinidumpContext could not be compared against "

                    "MinidumpSystemInfo";

     return true;

   }

   // If there is an MD_SYSTEM_INFO_STREAM, it should contain valid system info.

   const MDRawSystemInfo* raw_system_info = system_info->system_info();

   if (!raw_system_info) {

     BPLOG(INFO) << "MinidumpContext could not be compared against "

                    "MDRawSystemInfo";

     return false;

   }

   MDCPUArchitecture system_info_cpu_type = static_cast<MDCPUArchitecture>(

       raw_system_info->processor_architecture);

   // Compare the CPU type of the context record to the CPU type in the

   // minidump's system info stream.

   bool return_value = false;

   switch (context_cpu_type) {

     case MD_CONTEXT_X86:

       if (system_info_cpu_type == MD_CPU_ARCHITECTURE_X86 ||

           system_info_cpu_type == MD_CPU_ARCHITECTURE_X86_WIN64 ||

           system_info_cpu_type == MD_CPU_ARCHITECTURE_AMD64) {

         return_value = true;

       }

       break;

     case MD_CONTEXT_PPC:

       if (system_info_cpu_type == MD_CPU_ARCHITECTURE_PPC)

         return_value = true;

       break;

     case MD_CONTEXT_AMD64:

       if (system_info_cpu_type == MD_CPU_ARCHITECTURE_AMD64)

         return_value = true;

       break;

     case MD_CONTEXT_SPARC:

       if (system_info_cpu_type == MD_CPU_ARCHITECTURE_SPARC)

         return_value = true;

       break;

     case MD_CONTEXT_ARM:

       if (system_info_cpu_type == MD_CPU_ARCHITECTURE_ARM)

         return_value = true;

       break;

   }

   BPLOG_IF(ERROR, !return_value) << "MinidumpContext CPU " <<

                                     HexString(context_cpu_type) <<

                                     " wrong for MinidumpSystemInfo CPU " <<

                                     HexString(system_info_cpu_type);

   return return_value;

 }

 void MinidumpContext::Print() {

   if (!valid_) {

     BPLOG(ERROR) << "MinidumpContext cannot print invalid data";

     return;

   }

   switch (GetContextCPU()) {

     case MD_CONTEXT_X86: {

       const MDRawContextX86* context_x86 = GetContextX86();

       printf("MDRawContextX86\n");

       printf("  context_flags                = 0x%x\n",

              context_x86->context_flags);

       printf("  dr0                          = 0x%x\n", context_x86->dr0);

       printf("  dr1                          = 0x%x\n", context_x86->dr1);

       printf("  dr2                          = 0x%x\n", context_x86->dr2);

       printf("  dr3                          = 0x%x\n", context_x86->dr3);

       printf("  dr6                          = 0x%x\n", context_x86->dr6);

       printf("  dr7                          = 0x%x\n", context_x86->dr7);

       printf("  float_save.control_word      = 0x%x\n",

              context_x86->float_save.control_word);

       printf("  float_save.status_word       = 0x%x\n",

              context_x86->float_save.status_word);

       printf("  float_save.tag_word          = 0x%x\n",

              context_x86->float_save.tag_word);

       printf("  float_save.error_offset      = 0x%x\n",

              context_x86->float_save.error_offset);

       printf("  float_save.error_selector    = 0x%x\n",

              context_x86->float_save.error_selector);

       printf("  float_save.data_offset       = 0x%x\n",

              context_x86->float_save.data_offset);

       printf("  float_save.data_selector     = 0x%x\n",

              context_x86->float_save.data_selector);

       printf("  float_save.register_area[%2d] = 0x",

              MD_FLOATINGSAVEAREA_X86_REGISTERAREA_SIZE);

       for (unsigned int register_index = 0;

            register_index < MD_FLOATINGSAVEAREA_X86_REGISTERAREA_SIZE;

            ++register_index) {

         printf("%02x", context_x86->float_save.register_area[register_index]);

       }

       printf("\n");

       printf("  float_save.cr0_npx_state     = 0x%x\n",

              context_x86->float_save.cr0_npx_state);

       printf("  gs                           = 0x%x\n", context_x86->gs);

       printf("  fs                           = 0x%x\n", context_x86->fs);

       printf("  es                           = 0x%x\n", context_x86->es);

       printf("  ds                           = 0x%x\n", context_x86->ds);

       printf("  edi                          = 0x%x\n", context_x86->edi);

       printf("  esi                          = 0x%x\n", context_x86->esi);

       printf("  ebx                          = 0x%x\n", context_x86->ebx);

       printf("  edx                          = 0x%x\n", context_x86->edx);

       printf("  ecx                          = 0x%x\n", context_x86->ecx);

       printf("  eax                          = 0x%x\n", context_x86->eax);

       printf("  ebp                          = 0x%x\n", context_x86->ebp);

       printf("  eip                          = 0x%x\n", context_x86->eip);

       printf("  cs                           = 0x%x\n", context_x86->cs);

       printf("  eflags                       = 0x%x\n", context_x86->eflags);

       printf("  esp                          = 0x%x\n", context_x86->esp);

       printf("  ss                           = 0x%x\n", context_x86->ss);

       printf("  extended_registers[%3d]      = 0x",

              MD_CONTEXT_X86_EXTENDED_REGISTERS_SIZE);

       for (unsigned int register_index = 0;

            register_index < MD_CONTEXT_X86_EXTENDED_REGISTERS_SIZE;

            ++register_index) {

         printf("%02x", context_x86->extended_registers[register_index]);

       }

       printf("\n\n");

       break;

     }

     case MD_CONTEXT_PPC: {

       const MDRawContextPPC* context_ppc = GetContextPPC();

       printf("MDRawContextPPC\n");

       printf("  context_flags            = 0x%x\n",

              context_ppc->context_flags);

       printf("  srr0                     = 0x%x\n", context_ppc->srr0);

       printf("  srr1                     = 0x%x\n", context_ppc->srr1);

       for (unsigned int gpr_index = 0;

            gpr_index < MD_CONTEXT_PPC_GPR_COUNT;

            ++gpr_index) {

         printf("  gpr[%2d]                  = 0x%x\n",

                gpr_index, context_ppc->gpr[gpr_index]);

       }

       printf("  cr                       = 0x%x\n", context_ppc->cr);

       printf("  xer                      = 0x%x\n", context_ppc->xer);

       printf("  lr                       = 0x%x\n", context_ppc->lr);

       printf("  ctr                      = 0x%x\n", context_ppc->ctr);

       printf("  mq                       = 0x%x\n", context_ppc->mq);

       printf("  vrsave                   = 0x%x\n", context_ppc->vrsave);

       for (unsigned int fpr_index = 0;

            fpr_index < MD_FLOATINGSAVEAREA_PPC_FPR_COUNT;

            ++fpr_index) {

         printf("  float_save.fpregs[%2d]    = 0x%" PRIx64 "\n",

                fpr_index, context_ppc->float_save.fpregs[fpr_index]);

       }

       printf("  float_save.fpscr         = 0x%x\n",

              context_ppc->float_save.fpscr);

       // TODO(mmentovai): print the 128-bit quantities in

       // context_ppc->vector_save.  This isn't done yet because printf

       // doesn't support 128-bit quantities, and printing them using

       // PRIx64 as two 64-bit quantities requires knowledge of the CPU's

       // byte ordering.

       printf("  vector_save.save_vrvalid = 0x%x\n",

              context_ppc->vector_save.save_vrvalid);

       printf("\n");

       break;

     }

     case MD_CONTEXT_AMD64: {

       const MDRawContextAMD64* context_amd64 = GetContextAMD64();

       printf("MDRawContextAMD64\n");

       printf("  p1_home       = 0x%" PRIx64 "\n",

              context_amd64->p1_home);

       printf("  p2_home       = 0x%" PRIx64 "\n",

              context_amd64->p2_home);

       printf("  p3_home       = 0x%" PRIx64 "\n",

              context_amd64->p3_home);

       printf("  p4_home       = 0x%" PRIx64 "\n",

              context_amd64->p4_home);

       printf("  p5_home       = 0x%" PRIx64 "\n",

              context_amd64->p5_home);

       printf("  p6_home       = 0x%" PRIx64 "\n",

              context_amd64->p6_home);

       printf("  context_flags = 0x%x\n",

              context_amd64->context_flags);

       printf("  mx_csr        = 0x%x\n",

              context_amd64->mx_csr);

       printf("  cs            = 0x%x\n", context_amd64->cs);

       printf("  ds            = 0x%x\n", context_amd64->ds);

       printf("  es            = 0x%x\n", context_amd64->es);

       printf("  fs            = 0x%x\n", context_amd64->fs);

       printf("  gs            = 0x%x\n", context_amd64->gs);

       printf("  ss            = 0x%x\n", context_amd64->ss);

       printf("  eflags        = 0x%x\n", context_amd64->eflags);

       printf("  dr0           = 0x%" PRIx64 "\n", context_amd64->dr0);

       printf("  dr1           = 0x%" PRIx64 "\n", context_amd64->dr1);

       printf("  dr2           = 0x%" PRIx64 "\n", context_amd64->dr2);

       printf("  dr3           = 0x%" PRIx64 "\n", context_amd64->dr3);

       printf("  dr6           = 0x%" PRIx64 "\n", context_amd64->dr6);

       printf("  dr7           = 0x%" PRIx64 "\n", context_amd64->dr7);

       printf("  rax           = 0x%" PRIx64 "\n", context_amd64->rax);

       printf("  rcx           = 0x%" PRIx64 "\n", context_amd64->rcx);

       printf("  rdx           = 0x%" PRIx64 "\n", context_amd64->rdx);

       printf("  rbx           = 0x%" PRIx64 "\n", context_amd64->rbx);

       printf("  rsp           = 0x%" PRIx64 "\n", context_amd64->rsp);

       printf("  rbp           = 0x%" PRIx64 "\n", context_amd64->rbp);

       printf("  rsi           = 0x%" PRIx64 "\n", context_amd64->rsi);

       printf("  rdi           = 0x%" PRIx64 "\n", context_amd64->rdi);

       printf("  r8            = 0x%" PRIx64 "\n", context_amd64->r8);

       printf("  r9            = 0x%" PRIx64 "\n", context_amd64->r9);

       printf("  r10           = 0x%" PRIx64 "\n", context_amd64->r10);

       printf("  r11           = 0x%" PRIx64 "\n", context_amd64->r11);

       printf("  r12           = 0x%" PRIx64 "\n", context_amd64->r12);

       printf("  r13           = 0x%" PRIx64 "\n", context_amd64->r13);

       printf("  r14           = 0x%" PRIx64 "\n", context_amd64->r14);

       printf("  r15           = 0x%" PRIx64 "\n", context_amd64->r15);

       printf("  rip           = 0x%" PRIx64 "\n", context_amd64->rip);

       //TODO: print xmm, vector, debug registers

       printf("\n");

       break;

     }

     case MD_CONTEXT_SPARC: {

       const MDRawContextSPARC* context_sparc = GetContextSPARC();

       printf("MDRawContextSPARC\n");

       printf("  context_flags       = 0x%x\n",

              context_sparc->context_flags);

       for (unsigned int g_r_index = 0;

            g_r_index < MD_CONTEXT_SPARC_GPR_COUNT;

            ++g_r_index) {

         printf("  g_r[%2d]             = 0x%" PRIx64 "\n",

                g_r_index, context_sparc->g_r[g_r_index]);

       }

       printf("  ccr                 = 0x%" PRIx64 "\n", context_sparc->ccr);

       printf("  pc                  = 0x%" PRIx64 "\n", context_sparc->pc);

       printf("  npc                 = 0x%" PRIx64 "\n", context_sparc->npc);

       printf("  y                   = 0x%" PRIx64 "\n", context_sparc->y);

       printf("  asi                 = 0x%" PRIx64 "\n", context_sparc->asi);

       printf("  fprs                = 0x%" PRIx64 "\n", context_sparc->fprs);

       for (unsigned int fpr_index = 0;

            fpr_index < MD_FLOATINGSAVEAREA_SPARC_FPR_COUNT;

            ++fpr_index) {

         printf("  float_save.regs[%2d] = 0x%" PRIx64 "\n",

                fpr_index, context_sparc->float_save.regs[fpr_index]);

       }

       printf("  float_save.filler   = 0x%" PRIx64 "\n",

              context_sparc->float_save.filler);

       printf("  float_save.fsr      = 0x%" PRIx64 "\n",

              context_sparc->float_save.fsr);

       break;

     }

     case MD_CONTEXT_ARM: {

       const MDRawContextARM* context_arm = GetContextARM();

       printf("MDRawContextARM\n");

       printf("  context_flags       = 0x%x\n",

              context_arm->context_flags);

       for (unsigned int ireg_index = 0;

            ireg_index < MD_CONTEXT_ARM_GPR_COUNT;

            ++ireg_index) {

         printf("  iregs[%2d]            = 0x%x\n",

                ireg_index, context_arm->iregs[ireg_index]);

       }

       printf("  cpsr                = 0x%x\n", context_arm->cpsr);

       printf("  float_save.fpscr     = 0x%" PRIx64 "\n",

              context_arm->float_save.fpscr);

       for (unsigned int fpr_index = 0;

            fpr_index < MD_FLOATINGSAVEAREA_ARM_FPR_COUNT;

            ++fpr_index) {

         printf("  float_save.regs[%2d] = 0x%" PRIx64 "\n",

                fpr_index, context_arm->float_save.regs[fpr_index]);

       }

       for (unsigned int fpe_index = 0;

            fpe_index < MD_FLOATINGSAVEAREA_ARM_FPEXTRA_COUNT;

            ++fpe_index) {

         printf("  float_save.extra[%2d] = 0x%" PRIx32 "\n",

                fpe_index, context_arm->float_save.extra[fpe_index]);

       }

       break;

     }

     default: {

       break;

     }

   }

 }

 //

 // MinidumpMemoryRegion

 //

 uint32_t MinidumpMemoryRegion::max_bytes_ = 1024 * 1024;  // 1MB

 MinidumpMemoryRegion::MinidumpMemoryRegion(Minidump* minidump)

     : MinidumpObject(minidump),

       descriptor_(NULL),

       memory_(NULL) {

 }

 MinidumpMemoryRegion::~MinidumpMemoryRegion() {

   delete memory_;

 }

 void MinidumpMemoryRegion::SetDescriptor(MDMemoryDescriptor* descriptor) {

   descriptor_ = descriptor;

   valid_ = descriptor &&

            descriptor_->memory.data_size <=

                numeric_limits<uint64_t>::max() -

                descriptor_->start_of_memory_range;

 }

 const uint8_t* MinidumpMemoryRegion::GetMemory() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpMemoryRegion for GetMemory";

     return NULL;

   }

   if (!memory_) {

     if (descriptor_->memory.data_size == 0) {

       BPLOG(ERROR) << "MinidumpMemoryRegion is empty";

       return NULL;

     }

     if (!minidump_->SeekSet(descriptor_->memory.rva)) {

       BPLOG(ERROR) << "MinidumpMemoryRegion could not seek to memory region";

       return NULL;

     }

     if (descriptor_->memory.data_size > max_bytes_) {

       BPLOG(ERROR) << "MinidumpMemoryRegion size " <<

                       descriptor_->memory.data_size << " exceeds maximum " <<

                       max_bytes_;

       return NULL;

     }

     scoped_ptr< vector<uint8_t> > memory(

         new vector<uint8_t>(descriptor_->memory.data_size));

     if (!minidump_->ReadBytes(&(*memory)[0], descriptor_->memory.data_size)) {

       BPLOG(ERROR) << "MinidumpMemoryRegion could not read memory region";

       return NULL;

     }

     memory_ = memory.release();

   }

   return &(*memory_)[0];

 }

 uint64_t MinidumpMemoryRegion::GetBase() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpMemoryRegion for GetBase";

     return static_cast<uint64_t>(-1);

   }

   return descriptor_->start_of_memory_range;

 }

 uint32_t MinidumpMemoryRegion::GetSize() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpMemoryRegion for GetSize";

     return 0;

   }

   return descriptor_->memory.data_size;

 }

 void MinidumpMemoryRegion::FreeMemory() {

   delete memory_;

   memory_ = NULL;

 }

 template<typename T>

 bool MinidumpMemoryRegion::GetMemoryAtAddressInternal(uint64_t address,

                                                       T*        value) const {

   BPLOG_IF(ERROR, !value) << "MinidumpMemoryRegion::GetMemoryAtAddressInternal "

                              "requires |value|";

   assert(value);

   *value = 0;

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpMemoryRegion for "

                     "GetMemoryAtAddressInternal";

     return false;

   }

   // Common failure case

   if (address < descriptor_->start_of_memory_range ||

       sizeof(T) > numeric_limits<uint64_t>::max() - address ||

       address + sizeof(T) > descriptor_->start_of_memory_range +

                             descriptor_->memory.data_size) {

     BPLOG(INFO) << "MinidumpMemoryRegion request out of range: " <<

                     HexString(address) << "+" << sizeof(T) << "/" <<

                     HexString(descriptor_->start_of_memory_range) << "+" <<

                     HexString(descriptor_->memory.data_size);

     return false;

   }

   const uint8_t* memory = GetMemory();

   if (!memory) {

     // GetMemory already logged a perfectly good message.

     return false;

   }

   // If the CPU requires memory accesses to be aligned, this can crash.

   // x86 and ppc are able to cope, though.

   *value = *reinterpret_cast<const T*>(

       &memory[address - descriptor_->start_of_memory_range]);

   if (minidump_->swap())

     Swap(value);

   return true;

 }

 bool MinidumpMemoryRegion::GetMemoryAtAddress(uint64_t  address,

                                               uint8_t*  value) const {

   return GetMemoryAtAddressInternal(address, value);

 }

 bool MinidumpMemoryRegion::GetMemoryAtAddress(uint64_t  address,

                                               uint16_t* value) const {

   return GetMemoryAtAddressInternal(address, value);

 }

 bool MinidumpMemoryRegion::GetMemoryAtAddress(uint64_t  address,

                                               uint32_t* value) const {

   return GetMemoryAtAddressInternal(address, value);

 }

 bool MinidumpMemoryRegion::GetMemoryAtAddress(uint64_t  address,

                                               uint64_t* value) const {

   return GetMemoryAtAddressInternal(address, value);

 }

 void MinidumpMemoryRegion::Print() {

   if (!valid_) {

     BPLOG(ERROR) << "MinidumpMemoryRegion cannot print invalid data";

     return;

   }

   const uint8_t* memory = GetMemory();

   if (memory) {

     printf("0x");

     for (unsigned int byte_index = 0;

          byte_index < descriptor_->memory.data_size;

          byte_index++) {

       printf("%02x", memory[byte_index]);

     }

     printf("\n");

   } else {

     printf("No memory\n");

   }

 }

 //

 // MinidumpThread

 //

 MinidumpThread::MinidumpThread(Minidump* minidump)

     : MinidumpObject(minidump),

       thread_(),

       memory_(NULL),

       context_(NULL) {

 }

 MinidumpThread::~MinidumpThread() {

   delete memory_;

   delete context_;

 }

 bool MinidumpThread::Read() {

   // Invalidate cached data.

   delete memory_;

   memory_ = NULL;

   delete context_;

   context_ = NULL;

   valid_ = false;

   if (!minidump_->ReadBytes(&thread_, sizeof(thread_))) {

     BPLOG(ERROR) << "MinidumpThread cannot read thread";

     return false;

   }

   if (minidump_->swap()) {

     Swap(&thread_.thread_id);

     Swap(&thread_.suspend_count);

     Swap(&thread_.priority_class);

     Swap(&thread_.priority);

     Swap(&thread_.teb);

     Swap(&thread_.stack);

     Swap(&thread_.thread_context);

   }

   // Check for base + size overflow or undersize.

   if (thread_.stack.memory.data_size == 0 ||

       thread_.stack.memory.data_size > numeric_limits<uint64_t>::max() -

                                        thread_.stack.start_of_memory_range) {

     // This is ok, but log an error anyway.

     BPLOG(ERROR) << "MinidumpThread has a memory region problem, " <<

                     HexString(thread_.stack.start_of_memory_range) << "+" <<

                     HexString(thread_.stack.memory.data_size);

   } else {

     memory_ = new MinidumpMemoryRegion(minidump_);

     memory_->SetDescriptor(&thread_.stack);

   }

   valid_ = true;

   return true;

 }

 MinidumpMemoryRegion* MinidumpThread::GetMemory() {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpThread for GetMemory";

     return NULL;

   }

   return memory_;

 }

 MinidumpContext* MinidumpThread::GetContext() {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpThread for GetContext";

     return NULL;

   }

   if (!context_) {

     if (!minidump_->SeekSet(thread_.thread_context.rva)) {

       BPLOG(ERROR) << "MinidumpThread cannot seek to context";

       return NULL;

     }

     scoped_ptr<MinidumpContext> context(new MinidumpContext(minidump_));

     if (!context->Read(thread_.thread_context.data_size)) {

       BPLOG(ERROR) << "MinidumpThread cannot read context";

       return NULL;

     }

     context_ = context.release();

   }

   return context_;

 }

 bool MinidumpThread::GetThreadID(uint32_t *thread_id) const {

   BPLOG_IF(ERROR, !thread_id) << "MinidumpThread::GetThreadID requires "

                                  "|thread_id|";

   assert(thread_id);

   *thread_id = 0;

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpThread for GetThreadID";

     return false;

   }

   *thread_id = thread_.thread_id;

   return true;

 }

 void MinidumpThread::Print() {

   if (!valid_) {

     BPLOG(ERROR) << "MinidumpThread cannot print invalid data";

     return;

   }

   printf("MDRawThread\n");

   printf("  thread_id                   = 0x%x\n",   thread_.thread_id);

   printf("  suspend_count               = %d\n",     thread_.suspend_count);

   printf("  priority_class              = 0x%x\n",   thread_.priority_class);

   printf("  priority                    = 0x%x\n",   thread_.priority);

   printf("  teb                         = 0x%" PRIx64 "\n", thread_.teb);

   printf("  stack.start_of_memory_range = 0x%" PRIx64 "\n",

          thread_.stack.start_of_memory_range);

   printf("  stack.memory.data_size      = 0x%x\n",

          thread_.stack.memory.data_size);

   printf("  stack.memory.rva            = 0x%x\n",   thread_.stack.memory.rva);

   printf("  thread_context.data_size    = 0x%x\n",

          thread_.thread_context.data_size);

   printf("  thread_context.rva          = 0x%x\n",

          thread_.thread_context.rva);

   MinidumpContext* context = GetContext();

   if (context) {

     printf("\n");

     context->Print();

   } else {

     printf("  (no context)\n");

     printf("\n");

   }

   MinidumpMemoryRegion* memory = GetMemory();

   if (memory) {

     printf("Stack\n");

     memory->Print();

   } else {

     printf("No stack\n");

   }

   printf("\n");

 }

 //

 // MinidumpThreadList

 //

 uint32_t MinidumpThreadList::max_threads_ = 4096;

 MinidumpThreadList::MinidumpThreadList(Minidump* minidump)

     : MinidumpStream(minidump),

       id_to_thread_map_(),

       threads_(NULL),

       thread_count_(0) {

 }

 MinidumpThreadList::~MinidumpThreadList() {

   delete threads_;

 }

 bool MinidumpThreadList::Read(uint32_t expected_size) {

   // Invalidate cached data.

   id_to_thread_map_.clear();

   delete threads_;

   threads_ = NULL;

   thread_count_ = 0;

   valid_ = false;

   uint32_t thread_count;

   if (expected_size < sizeof(thread_count)) {

     BPLOG(ERROR) << "MinidumpThreadList count size mismatch, " <<

                     expected_size << " < " << sizeof(thread_count);

     return false;

   }

   if (!minidump_->ReadBytes(&thread_count, sizeof(thread_count))) {

     BPLOG(ERROR) << "MinidumpThreadList cannot read thread count";

     return false;

   }

   if (minidump_->swap())

     Swap(&thread_count);

   if (thread_count > numeric_limits<uint32_t>::max() / sizeof(MDRawThread)) {

     BPLOG(ERROR) << "MinidumpThreadList thread count " << thread_count <<

                     " would cause multiplication overflow";

     return false;

   }

   if (expected_size != sizeof(thread_count) +

                        thread_count * sizeof(MDRawThread)) {

     // may be padded with 4 bytes on 64bit ABIs for alignment

     if (expected_size == sizeof(thread_count) + 4 +

                          thread_count * sizeof(MDRawThread)) {

       uint32_t useless;

       if (!minidump_->ReadBytes(&useless, 4)) {

         BPLOG(ERROR) << "MinidumpThreadList cannot read threadlist padded bytes";

         return false;

       }

     } else {

       BPLOG(ERROR) << "MinidumpThreadList size mismatch, " << expected_size <<

                     " != " << sizeof(thread_count) +

                     thread_count * sizeof(MDRawThread);

       return false;

     }

   }

   if (thread_count > max_threads_) {

     BPLOG(ERROR) << "MinidumpThreadList count " << thread_count <<

                     " exceeds maximum " << max_threads_;

     return false;

   }

   if (thread_count != 0) {

     scoped_ptr<MinidumpThreads> threads(

         new MinidumpThreads(thread_count, MinidumpThread(minidump_)));

     for (unsigned int thread_index = 0;

          thread_index < thread_count;

          ++thread_index) {

       MinidumpThread* thread = &(*threads)[thread_index];

       // Assume that the file offset is correct after the last read.

       if (!thread->Read()) {

         BPLOG(ERROR) << "MinidumpThreadList cannot read thread " <<

                         thread_index << "/" << thread_count;

         return false;

       }

       uint32_t thread_id;

       if (!thread->GetThreadID(&thread_id)) {

         BPLOG(ERROR) << "MinidumpThreadList cannot get thread ID for thread " <<

                         thread_index << "/" << thread_count;

         return false;

       }

       if (GetThreadByID(thread_id)) {

         // Another thread with this ID is already in the list.  Data error.

         BPLOG(ERROR) << "MinidumpThreadList found multiple threads with ID " <<

                         HexString(thread_id) << " at thread " <<

                         thread_index << "/" << thread_count;

         return false;

       }

       id_to_thread_map_[thread_id] = thread;

     }

     threads_ = threads.release();

   }

   thread_count_ = thread_count;

   valid_ = true;

   return true;

 }

 MinidumpThread* MinidumpThreadList::GetThreadAtIndex(unsigned int index)

     const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpThreadList for GetThreadAtIndex";

     return NULL;

   }

   if (index >= thread_count_) {

     BPLOG(ERROR) << "MinidumpThreadList index out of range: " <<

                     index << "/" << thread_count_;

     return NULL;

   }

   return &(*threads_)[index];

 }

 MinidumpThread* MinidumpThreadList::GetThreadByID(uint32_t thread_id) {

   // Don't check valid_.  Read calls this method before everything is

   // validated.  It is safe to not check valid_ here.

   return id_to_thread_map_[thread_id];

 }

 void MinidumpThreadList::Print() {

   if (!valid_) {

     BPLOG(ERROR) << "MinidumpThreadList cannot print invalid data";

     return;

   }

   printf("MinidumpThreadList\n");

   printf("  thread_count = %d\n", thread_count_);

   printf("\n");

   for (unsigned int thread_index = 0;

        thread_index < thread_count_;

        ++thread_index) {

     printf("thread[%d]\n", thread_index);

     (*threads_)[thread_index].Print();

   }

 }

 //

 // MinidumpModule

 //

 uint32_t MinidumpModule::max_cv_bytes_ = 32768;

 uint32_t MinidumpModule::max_misc_bytes_ = 32768;

 MinidumpModule::MinidumpModule(Minidump* minidump)

     : MinidumpObject(minidump),

       module_valid_(false),

       has_debug_info_(false),

       module_(),

       name_(NULL),

       cv_record_(NULL),

       cv_record_signature_(MD_CVINFOUNKNOWN_SIGNATURE),

       misc_record_(NULL) {

 }

 MinidumpModule::~MinidumpModule() {

   delete name_;

   delete cv_record_;

   delete misc_record_;

 }

 bool MinidumpModule::Read() {

   // Invalidate cached data.

   delete name_;

   name_ = NULL;

   delete cv_record_;

   cv_record_ = NULL;

   cv_record_signature_ = MD_CVINFOUNKNOWN_SIGNATURE;

   delete misc_record_;

   misc_record_ = NULL;

   module_valid_ = false;

   has_debug_info_ = false;

   valid_ = false;

   if (!minidump_->ReadBytes(&module_, MD_MODULE_SIZE)) {

     BPLOG(ERROR) << "MinidumpModule cannot read module";

     return false;

   }

   if (minidump_->swap()) {

     Swap(&module_.base_of_image);

     Swap(&module_.size_of_image);

     Swap(&module_.checksum);

     Swap(&module_.time_date_stamp);

     Swap(&module_.module_name_rva);

     Swap(&module_.version_info.signature);

     Swap(&module_.version_info.struct_version);

     Swap(&module_.version_info.file_version_hi);

     Swap(&module_.version_info.file_version_lo);

     Swap(&module_.version_info.product_version_hi);

     Swap(&module_.version_info.product_version_lo);

     Swap(&module_.version_info.file_flags_mask);

     Swap(&module_.version_info.file_flags);

     Swap(&module_.version_info.file_os);

     Swap(&module_.version_info.file_type);

     Swap(&module_.version_info.file_subtype);

     Swap(&module_.version_info.file_date_hi);

     Swap(&module_.version_info.file_date_lo);

     Swap(&module_.cv_record);

     Swap(&module_.misc_record);

     // Don't swap reserved fields because their contents are unknown (as

     // are their proper widths).

   }

   // Check for base + size overflow or undersize.

   if (module_.size_of_image == 0 ||

       module_.size_of_image >

           numeric_limits<uint64_t>::max() - module_.base_of_image) {

     BPLOG(ERROR) << "MinidumpModule has a module problem, " <<

                     HexString(module_.base_of_image) << "+" <<

                     HexString(module_.size_of_image);

     return false;

   }

   module_valid_ = true;

   return true;

 }

 bool MinidumpModule::ReadAuxiliaryData() {

   if (!module_valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for ReadAuxiliaryData";

     return false;

   }

   // Each module must have a name.

   name_ = minidump_->ReadString(module_.module_name_rva);

   if (!name_) {

     BPLOG(ERROR) << "MinidumpModule could not read name";

     return false;

   }

   // At this point, we have enough info for the module to be valid.

   valid_ = true;

   // CodeView and miscellaneous debug records are only required if the

   // module indicates that they exist.

   if (module_.cv_record.data_size && !GetCVRecord(NULL)) {

     BPLOG(ERROR) << "MinidumpModule has no CodeView record, "

                     "but one was expected";

     return false;

   }

   if (module_.misc_record.data_size && !GetMiscRecord(NULL)) {

     BPLOG(ERROR) << "MinidumpModule has no miscellaneous debug record, "

                     "but one was expected";

     return false;

   }

   has_debug_info_ = true;

   return true;

 }

 string MinidumpModule::code_file() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for code_file";

     return "";

   }

   return *name_;

 }

 string MinidumpModule::code_identifier() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for code_identifier";

     return "";

   }

   if (!has_debug_info_)

     return "";

   MinidumpSystemInfo *minidump_system_info = minidump_->GetSystemInfo();

   if (!minidump_system_info) {

     BPLOG(ERROR) << "MinidumpModule code_identifier requires "

                     "MinidumpSystemInfo";

     return "";

   }

   const MDRawSystemInfo *raw_system_info = minidump_system_info->system_info();

   if (!raw_system_info) {

     BPLOG(ERROR) << "MinidumpModule code_identifier requires MDRawSystemInfo";

     return "";

   }

   string identifier;

   switch (raw_system_info->platform_id) {

     case MD_OS_WIN32_NT:

     case MD_OS_WIN32_WINDOWS: {

       // Use the same format that the MS symbol server uses in filesystem

       // hierarchies.

       char identifier_string[17];

       snprintf(identifier_string, sizeof(identifier_string), "%08X%x",

                module_.time_date_stamp, module_.size_of_image);

       identifier = identifier_string;

       break;

     }

     case MD_OS_MAC_OS_X:

     case MD_OS_IOS:

     case MD_OS_SOLARIS:

     case MD_OS_ANDROID:

     case MD_OS_LINUX: {

       // TODO(mmentovai): support uuid extension if present, otherwise fall

       // back to version (from LC_ID_DYLIB?), otherwise fall back to something

       // else.

       identifier = "id";

       break;

     }

     default: {

       // Without knowing what OS generated the dump, we can't generate a good

       // identifier.  Return an empty string, signalling failure.

       BPLOG(ERROR) << "MinidumpModule code_identifier requires known platform, "

                       "found " << HexString(raw_system_info->platform_id);

       break;

     }

   }

   return identifier;

 }

 string MinidumpModule::debug_file() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for debug_file";

     return "";

   }

   if (!has_debug_info_)

     return "";

   string file;

   // Prefer the CodeView record if present.

   if (cv_record_) {

     if (cv_record_signature_ == MD_CVINFOPDB70_SIGNATURE) {

       // It's actually an MDCVInfoPDB70 structure.

       const MDCVInfoPDB70* cv_record_70 =

           reinterpret_cast<const MDCVInfoPDB70*>(&(*cv_record_)[0]);

       assert(cv_record_70->cv_signature == MD_CVINFOPDB70_SIGNATURE);

       // GetCVRecord guarantees pdb_file_name is null-terminated.

       file = reinterpret_cast<const char*>(cv_record_70->pdb_file_name);

     } else if (cv_record_signature_ == MD_CVINFOPDB20_SIGNATURE) {

       // It's actually an MDCVInfoPDB20 structure.

       const MDCVInfoPDB20* cv_record_20 =

           reinterpret_cast<const MDCVInfoPDB20*>(&(*cv_record_)[0]);

       assert(cv_record_20->cv_header.signature == MD_CVINFOPDB20_SIGNATURE);

       // GetCVRecord guarantees pdb_file_name is null-terminated.

       file = reinterpret_cast<const char*>(cv_record_20->pdb_file_name);

     }

     // If there's a CodeView record but it doesn't match a known signature,

     // try the miscellaneous record.

   }

   if (file.empty()) {

     // No usable CodeView record.  Try the miscellaneous debug record.

     if (misc_record_) {

       const MDImageDebugMisc* misc_record =

           reinterpret_cast<const MDImageDebugMisc *>(&(*misc_record_)[0]);

       if (!misc_record->unicode) {

         // If it's not Unicode, just stuff it into the string.  It's unclear

         // if misc_record->data is 0-terminated, so use an explicit size.

         file = string(

             reinterpret_cast<const char*>(misc_record->data),

             module_.misc_record.data_size - MDImageDebugMisc_minsize);

       } else {

         // There's a misc_record but it encodes the debug filename in UTF-16.

         // (Actually, because miscellaneous records are so old, it's probably

         // UCS-2.)  Convert it to UTF-8 for congruity with the other strings

         // that this method (and all other methods in the Minidump family)

         // return.

         unsigned int bytes =

             module_.misc_record.data_size - MDImageDebugMisc_minsize;

         if (bytes % 2 == 0) {

           unsigned int utf16_words = bytes / 2;

           // UTF16ToUTF8 expects a vector<uint16_t>, so create a temporary one

           // and copy the UTF-16 data into it.

           vector<uint16_t> string_utf16(utf16_words);

           if (utf16_words)

             memcpy(&string_utf16[0], &misc_record->data, bytes);

           // GetMiscRecord already byte-swapped the data[] field if it contains

           // UTF-16, so pass false as the swap argument.

           scoped_ptr<string> new_file(UTF16ToUTF8(string_utf16, false));

           file = *new_file;

         }

       }

     }

   }

   // Relatively common case

   BPLOG_IF(INFO, file.empty()) << "MinidumpModule could not determine "

                                   "debug_file for " << *name_;

   return file;

 }

 string MinidumpModule::debug_identifier() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for debug_identifier";

     return "";

   }

   if (!has_debug_info_)

     return "";

   string identifier;

   // Use the CodeView record if present.

   if (cv_record_) {

     if (cv_record_signature_ == MD_CVINFOPDB70_SIGNATURE) {

       // It's actually an MDCVInfoPDB70 structure.

       const MDCVInfoPDB70* cv_record_70 =

           reinterpret_cast<const MDCVInfoPDB70*>(&(*cv_record_)[0]);

       assert(cv_record_70->cv_signature == MD_CVINFOPDB70_SIGNATURE);

       // Use the same format that the MS symbol server uses in filesystem

       // hierarchies.

       char identifier_string[41];

       snprintf(identifier_string, sizeof(identifier_string),

                "%08X%04X%04X%02X%02X%02X%02X%02X%02X%02X%02X%x",

                cv_record_70->signature.data1,

                cv_record_70->signature.data2,

                cv_record_70->signature.data3,

                cv_record_70->signature.data4[0],

                cv_record_70->signature.data4[1],

                cv_record_70->signature.data4[2],

                cv_record_70->signature.data4[3],

                cv_record_70->signature.data4[4],

                cv_record_70->signature.data4[5],

                cv_record_70->signature.data4[6],

                cv_record_70->signature.data4[7],

                cv_record_70->age);

       identifier = identifier_string;

     } else if (cv_record_signature_ == MD_CVINFOPDB20_SIGNATURE) {

       // It's actually an MDCVInfoPDB20 structure.

       const MDCVInfoPDB20* cv_record_20 =

           reinterpret_cast<const MDCVInfoPDB20*>(&(*cv_record_)[0]);

       assert(cv_record_20->cv_header.signature == MD_CVINFOPDB20_SIGNATURE);

       // Use the same format that the MS symbol server uses in filesystem

       // hierarchies.

       char identifier_string[17];

       snprintf(identifier_string, sizeof(identifier_string),

                "%08X%x", cv_record_20->signature, cv_record_20->age);

       identifier = identifier_string;

     }

   }

   // TODO(mmentovai): if there's no usable CodeView record, there might be a

   // miscellaneous debug record.  It only carries a filename, though, and no

   // identifier.  I'm not sure what the right thing to do for the identifier

   // is in that case, but I don't expect to find many modules without a

   // CodeView record (or some other Breakpad extension structure in place of

   // a CodeView record).  Treat it as an error (empty identifier) for now.

   // TODO(mmentovai): on the Mac, provide fallbacks as in code_identifier().

   // Relatively common case

   BPLOG_IF(INFO, identifier.empty()) << "MinidumpModule could not determine "

                                         "debug_identifier for " << *name_;

   return identifier;

 }

 string MinidumpModule::version() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for version";

     return "";

   }

   string version;

   if (module_.version_info.signature == MD_VSFIXEDFILEINFO_SIGNATURE &&

       module_.version_info.struct_version & MD_VSFIXEDFILEINFO_VERSION) {

     char version_string[24];

     snprintf(version_string, sizeof(version_string), "%u.%u.%u.%u",

              module_.version_info.file_version_hi >> 16,

              module_.version_info.file_version_hi & 0xffff,

              module_.version_info.file_version_lo >> 16,

              module_.version_info.file_version_lo & 0xffff);

     version = version_string;

   }

   // TODO(mmentovai): possibly support other struct types in place of

   // the one used with MD_VSFIXEDFILEINFO_SIGNATURE.  We can possibly use

   // a different structure that better represents versioning facilities on

   // Mac OS X and Linux, instead of forcing them to adhere to the dotted

   // quad of 16-bit ints that Windows uses.

   BPLOG_IF(INFO, version.empty()) << "MinidumpModule could not determine "

                                      "version for " << *name_;

   return version;

 }

 const CodeModule* MinidumpModule::Copy() const {

   return new BasicCodeModule(this);

 }

 const uint8_t* MinidumpModule::GetCVRecord(uint32_t* size) {

   if (!module_valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for GetCVRecord";

     return NULL;

   }

   if (!cv_record_) {

     // This just guards against 0-sized CodeView records; more specific checks

     // are used when the signature is checked against various structure types.

     if (module_.cv_record.data_size == 0) {

       return NULL;

     }

     if (!minidump_->SeekSet(module_.cv_record.rva)) {

       BPLOG(ERROR) << "MinidumpModule could not seek to CodeView record";

       return NULL;

     }

     if (module_.cv_record.data_size > max_cv_bytes_) {

       BPLOG(ERROR) << "MinidumpModule CodeView record size " <<

                       module_.cv_record.data_size << " exceeds maximum " <<

                       max_cv_bytes_;

       return NULL;

     }

     // Allocating something that will be accessed as MDCVInfoPDB70 or

     // MDCVInfoPDB20 but is allocated as uint8_t[] can cause alignment

     // problems.  x86 and ppc are able to cope, though.  This allocation

     // style is needed because the MDCVInfoPDB70 or MDCVInfoPDB20 are

     // variable-sized due to their pdb_file_name fields; these structures

     // are not MDCVInfoPDB70_minsize or MDCVInfoPDB20_minsize and treating

     // them as such would result in incomplete structures or overruns.

     scoped_ptr< vector<uint8_t> > cv_record(

         new vector<uint8_t>(module_.cv_record.data_size));

     if (!minidump_->ReadBytes(&(*cv_record)[0], module_.cv_record.data_size)) {

       BPLOG(ERROR) << "MinidumpModule could not read CodeView record";

       return NULL;

     }

     uint32_t signature = MD_CVINFOUNKNOWN_SIGNATURE;

     if (module_.cv_record.data_size > sizeof(signature)) {

       MDCVInfoPDB70* cv_record_signature =

           reinterpret_cast<MDCVInfoPDB70*>(&(*cv_record)[0]);

       signature = cv_record_signature->cv_signature;

       if (minidump_->swap())

         Swap(&signature);

     }

     if (signature == MD_CVINFOPDB70_SIGNATURE) {

       // Now that the structure type is known, recheck the size.

       if (MDCVInfoPDB70_minsize > module_.cv_record.data_size) {

         BPLOG(ERROR) << "MinidumpModule CodeView7 record size mismatch, " <<

                         MDCVInfoPDB70_minsize << " > " <<

                         module_.cv_record.data_size;

         return NULL;

       }

       if (minidump_->swap()) {

         MDCVInfoPDB70* cv_record_70 =

             reinterpret_cast<MDCVInfoPDB70*>(&(*cv_record)[0]);

         Swap(&cv_record_70->cv_signature);

         Swap(&cv_record_70->signature);

         Swap(&cv_record_70->age);

         // Don't swap cv_record_70.pdb_file_name because it's an array of 8-bit

         // quantities.  (It's a path, is it UTF-8?)

       }

       // The last field of either structure is null-terminated 8-bit character

       // data.  Ensure that it's null-terminated.

       if ((*cv_record)[module_.cv_record.data_size - 1] != '\0') {

         BPLOG(ERROR) << "MinidumpModule CodeView7 record string is not "

                         "0-terminated";

         return NULL;

       }

     } else if (signature == MD_CVINFOPDB20_SIGNATURE) {

       // Now that the structure type is known, recheck the size.

       if (MDCVInfoPDB20_minsize > module_.cv_record.data_size) {

         BPLOG(ERROR) << "MinidumpModule CodeView2 record size mismatch, " <<

                         MDCVInfoPDB20_minsize << " > " <<

                         module_.cv_record.data_size;

         return NULL;

       }

       if (minidump_->swap()) {

         MDCVInfoPDB20* cv_record_20 =

             reinterpret_cast<MDCVInfoPDB20*>(&(*cv_record)[0]);

         Swap(&cv_record_20->cv_header.signature);

         Swap(&cv_record_20->cv_header.offset);

         Swap(&cv_record_20->signature);

         Swap(&cv_record_20->age);

         // Don't swap cv_record_20.pdb_file_name because it's an array of 8-bit

         // quantities.  (It's a path, is it UTF-8?)

       }

       // The last field of either structure is null-terminated 8-bit character

       // data.  Ensure that it's null-terminated.

       if ((*cv_record)[module_.cv_record.data_size - 1] != '\0') {

         BPLOG(ERROR) << "MindumpModule CodeView2 record string is not "

                         "0-terminated";

         return NULL;

       }

     }

     // If the signature doesn't match something above, it's not something

     // that Breakpad can presently handle directly.  Because some modules in

     // the wild contain such CodeView records as MD_CVINFOCV50_SIGNATURE,

     // don't bail out here - allow the data to be returned to the user,

     // although byte-swapping can't be done.

     // Store the vector type because that's how storage was allocated, but

     // return it casted to uint8_t*.

     cv_record_ = cv_record.release();

     cv_record_signature_ = signature;

   }

   if (size)

     *size = module_.cv_record.data_size;

   return &(*cv_record_)[0];

 }

 const MDImageDebugMisc* MinidumpModule::GetMiscRecord(uint32_t* size) {

   if (!module_valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModule for GetMiscRecord";

     return NULL;

   }

   if (!misc_record_) {

     if (module_.misc_record.data_size == 0) {

       return NULL;

     }

     if (MDImageDebugMisc_minsize > module_.misc_record.data_size) {

       BPLOG(ERROR) << "MinidumpModule miscellaneous debugging record "

                       "size mismatch, " << MDImageDebugMisc_minsize << " > " <<

                       module_.misc_record.data_size;

       return NULL;

     }

     if (!minidump_->SeekSet(module_.misc_record.rva)) {

       BPLOG(ERROR) << "MinidumpModule could not seek to miscellaneous "

                       "debugging record";

       return NULL;

     }

     if (module_.misc_record.data_size > max_misc_bytes_) {

       BPLOG(ERROR) << "MinidumpModule miscellaneous debugging record size " <<

                       module_.misc_record.data_size << " exceeds maximum " <<

                       max_misc_bytes_;

       return NULL;

     }

     // Allocating something that will be accessed as MDImageDebugMisc but

     // is allocated as uint8_t[] can cause alignment problems.  x86 and

     // ppc are able to cope, though.  This allocation style is needed

     // because the MDImageDebugMisc is variable-sized due to its data field;

     // this structure is not MDImageDebugMisc_minsize and treating it as such

     // would result in an incomplete structure or an overrun.

     scoped_ptr< vector<uint8_t> > misc_record_mem(

         new vector<uint8_t>(module_.misc_record.data_size));

     MDImageDebugMisc* misc_record =

         reinterpret_cast<MDImageDebugMisc*>(&(*misc_record_mem)[0]);

     if (!minidump_->ReadBytes(misc_record, module_.misc_record.data_size)) {

       BPLOG(ERROR) << "MinidumpModule could not read miscellaneous debugging "

                       "record";

       return NULL;

     }

     if (minidump_->swap()) {

       Swap(&misc_record->data_type);

       Swap(&misc_record->length);

       // Don't swap misc_record.unicode because it's an 8-bit quantity.

       // Don't swap the reserved fields for the same reason, and because

       // they don't contain any valid data.

       if (misc_record->unicode) {

         // There is a potential alignment problem, but shouldn't be a problem

         // in practice due to the layout of MDImageDebugMisc.

         uint16_t* data16 = reinterpret_cast<uint16_t*>(&(misc_record->data));

         unsigned int dataBytes = module_.misc_record.data_size -

                                  MDImageDebugMisc_minsize;

         unsigned int dataLength = dataBytes / 2;

         for (unsigned int characterIndex = 0;

              characterIndex < dataLength;

              ++characterIndex) {

           Swap(&data16[characterIndex]);

         }

       }

     }

     if (module_.misc_record.data_size != misc_record->length) {

       BPLOG(ERROR) << "MinidumpModule miscellaneous debugging record data "

                       "size mismatch, " << module_.misc_record.data_size <<

                       " != " << misc_record->length;

       return NULL;

     }

     // Store the vector type because that's how storage was allocated, but

     // return it casted to MDImageDebugMisc*.

     misc_record_ = misc_record_mem.release();

   }

   if (size)

     *size = module_.misc_record.data_size;

   return reinterpret_cast<MDImageDebugMisc*>(&(*misc_record_)[0]);

 }

 void MinidumpModule::Print() {

   if (!valid_) {

     BPLOG(ERROR) << "MinidumpModule cannot print invalid data";

     return;

   }

   printf("MDRawModule\n");

   printf("  base_of_image                   = 0x%" PRIx64 "\n",

          module_.base_of_image);

   printf("  size_of_image                   = 0x%x\n",

          module_.size_of_image);

   printf("  checksum                        = 0x%x\n",

          module_.checksum);

   printf("  time_date_stamp                 = 0x%x\n",

          module_.time_date_stamp);

   printf("  module_name_rva                 = 0x%x\n",

          module_.module_name_rva);

   printf("  version_info.signature          = 0x%x\n",

          module_.version_info.signature);

   printf("  version_info.struct_version     = 0x%x\n",

          module_.version_info.struct_version);

   printf("  version_info.file_version       = 0x%x:0x%x\n",

          module_.version_info.file_version_hi,

          module_.version_info.file_version_lo);

   printf("  version_info.product_version    = 0x%x:0x%x\n",

          module_.version_info.product_version_hi,

          module_.version_info.product_version_lo);

   printf("  version_info.file_flags_mask    = 0x%x\n",

          module_.version_info.file_flags_mask);

   printf("  version_info.file_flags         = 0x%x\n",

          module_.version_info.file_flags);

   printf("  version_info.file_os            = 0x%x\n",

          module_.version_info.file_os);

   printf("  version_info.file_type          = 0x%x\n",

          module_.version_info.file_type);

   printf("  version_info.file_subtype       = 0x%x\n",

          module_.version_info.file_subtype);

   printf("  version_info.file_date          = 0x%x:0x%x\n",

          module_.version_info.file_date_hi,

          module_.version_info.file_date_lo);

   printf("  cv_record.data_size             = %d\n",

          module_.cv_record.data_size);

   printf("  cv_record.rva                   = 0x%x\n",

          module_.cv_record.rva);

   printf("  misc_record.data_size           = %d\n",

          module_.misc_record.data_size);

   printf("  misc_record.rva                 = 0x%x\n",

          module_.misc_record.rva);

   printf("  (code_file)                     = \"%s\"\n", code_file().c_str());

   printf("  (code_identifier)               = \"%s\"\n",

          code_identifier().c_str());

   uint32_t cv_record_size;

   const uint8_t *cv_record = GetCVRecord(&cv_record_size);

   if (cv_record) {

     if (cv_record_signature_ == MD_CVINFOPDB70_SIGNATURE) {

       const MDCVInfoPDB70* cv_record_70 =

           reinterpret_cast<const MDCVInfoPDB70*>(cv_record);

       assert(cv_record_70->cv_signature == MD_CVINFOPDB70_SIGNATURE);

       printf("  (cv_record).cv_signature        = 0x%x\n",

              cv_record_70->cv_signature);

       printf("  (cv_record).signature           = %08x-%04x-%04x-%02x%02x-",

              cv_record_70->signature.data1,

              cv_record_70->signature.data2,

              cv_record_70->signature.data3,

              cv_record_70->signature.data4[0],

              cv_record_70->signature.data4[1]);

       for (unsigned int guidIndex = 2;

            guidIndex < 8;

            ++guidIndex) {

         printf("%02x", cv_record_70->signature.data4[guidIndex]);

       }

       printf("\n");

       printf("  (cv_record).age                 = %d\n",

              cv_record_70->age);

       printf("  (cv_record).pdb_file_name       = \"%s\"\n",

              cv_record_70->pdb_file_name);

     } else if (cv_record_signature_ == MD_CVINFOPDB20_SIGNATURE) {

       const MDCVInfoPDB20* cv_record_20 =

           reinterpret_cast<const MDCVInfoPDB20*>(cv_record);

       assert(cv_record_20->cv_header.signature == MD_CVINFOPDB20_SIGNATURE);

       printf("  (cv_record).cv_header.signature = 0x%x\n",

              cv_record_20->cv_header.signature);

       printf("  (cv_record).cv_header.offset    = 0x%x\n",

              cv_record_20->cv_header.offset);

       printf("  (cv_record).signature           = 0x%x\n",

              cv_record_20->signature);

       printf("  (cv_record).age                 = %d\n",

              cv_record_20->age);

       printf("  (cv_record).pdb_file_name       = \"%s\"\n",

              cv_record_20->pdb_file_name);

     } else {

       printf("  (cv_record)                     = ");

       for (unsigned int cv_byte_index = 0;

            cv_byte_index < cv_record_size;

            ++cv_byte_index) {

         printf("%02x", cv_record[cv_byte_index]);

       }

       printf("\n");

     }

   } else {

     printf("  (cv_record)                     = (null)\n");

   }

   const MDImageDebugMisc* misc_record = GetMiscRecord(NULL);

   if (misc_record) {

     printf("  (misc_record).data_type         = 0x%x\n",

            misc_record->data_type);

     printf("  (misc_record).length            = 0x%x\n",

            misc_record->length);

     printf("  (misc_record).unicode           = %d\n",

            misc_record->unicode);

     // Don't bother printing the UTF-16, we don't really even expect to ever

     // see this misc_record anyway.

     if (misc_record->unicode)

       printf("  (misc_record).data              = \"%s\"\n",

              misc_record->data);

     else

       printf("  (misc_record).data              = (UTF-16)\n");

   } else {

     printf("  (misc_record)                   = (null)\n");

   }

   printf("  (debug_file)                    = \"%s\"\n", debug_file().c_str());

   printf("  (debug_identifier)              = \"%s\"\n",

          debug_identifier().c_str());

   printf("  (version)                       = \"%s\"\n", version().c_str());

   printf("\n");

 }

 //

 // MinidumpModuleList

 //

 uint32_t MinidumpModuleList::max_modules_ = 1024;

 MinidumpModuleList::MinidumpModuleList(Minidump* minidump)

     : MinidumpStream(minidump),

       range_map_(new RangeMap<uint64_t, unsigned int>()),

       modules_(NULL),

       module_count_(0) {

 }

 MinidumpModuleList::~MinidumpModuleList() {

   delete range_map_;

   delete modules_;

 }

 bool MinidumpModuleList::Read(uint32_t expected_size) {

   // Invalidate cached data.

   range_map_->Clear();

   delete modules_;

   modules_ = NULL;

   module_count_ = 0;

   valid_ = false;

   uint32_t module_count;

   if (expected_size < sizeof(module_count)) {

     BPLOG(ERROR) << "MinidumpModuleList count size mismatch, " <<

                     expected_size << " < " << sizeof(module_count);

     return false;

   }

   if (!minidump_->ReadBytes(&module_count, sizeof(module_count))) {

     BPLOG(ERROR) << "MinidumpModuleList could not read module count";

     return false;

   }

   if (minidump_->swap())

     Swap(&module_count);

   if (module_count > numeric_limits<uint32_t>::max() / MD_MODULE_SIZE) {

     BPLOG(ERROR) << "MinidumpModuleList module count " << module_count <<

                     " would cause multiplication overflow";

     return false;

   }

   if (expected_size != sizeof(module_count) +

                        module_count * MD_MODULE_SIZE) {

     // may be padded with 4 bytes on 64bit ABIs for alignment

     if (expected_size == sizeof(module_count) + 4 +

                          module_count * MD_MODULE_SIZE) {

       uint32_t useless;

       if (!minidump_->ReadBytes(&useless, 4)) {

         BPLOG(ERROR) << "MinidumpModuleList cannot read modulelist padded bytes";

         return false;

       }

     } else {

       BPLOG(ERROR) << "MinidumpModuleList size mismatch, " << expected_size <<

                       " != " << sizeof(module_count) +

                       module_count * MD_MODULE_SIZE;

       return false;

     }

   }

   if (module_count > max_modules_) {

     BPLOG(ERROR) << "MinidumpModuleList count " << module_count_ <<

                     " exceeds maximum " << max_modules_;

     return false;

   }

   if (module_count != 0) {

     scoped_ptr<MinidumpModules> modules(

         new MinidumpModules(module_count, MinidumpModule(minidump_)));

     for (unsigned int module_index = 0;

          module_index < module_count;

          ++module_index) {

       MinidumpModule* module = &(*modules)[module_index];

       // Assume that the file offset is correct after the last read.

       if (!module->Read()) {

         BPLOG(ERROR) << "MinidumpModuleList could not read module " <<

                         module_index << "/" << module_count;

         return false;

       }

     }

     // Loop through the module list once more to read additional data and

     // build the range map.  This is done in a second pass because

     // MinidumpModule::ReadAuxiliaryData seeks around, and if it were

     // included in the loop above, additional seeks would be needed where

     // none are now to read contiguous data.

     for (unsigned int module_index = 0;

          module_index < module_count;

          ++module_index) {

       MinidumpModule* module = &(*modules)[module_index];

       // ReadAuxiliaryData fails if any data that the module indicates should

       // exist is missing, but we treat some such cases as valid anyway.  See

       // issue #222: if a debugging record is of a format that's too large to

       // handle, it shouldn't render the entire dump invalid.  Check module

       // validity before giving up.

       if (!module->ReadAuxiliaryData() && !module->valid()) {

         BPLOG(ERROR) << "MinidumpModuleList could not read required module "

                         "auxiliary data for module " <<

                         module_index << "/" << module_count;

         return false;

       }

       // It is safe to use module->code_file() after successfully calling

       // module->ReadAuxiliaryData or noting that the module is valid.

       uint64_t base_address = module->base_address();

       uint64_t module_size = module->size();

       if (base_address == static_cast<uint64_t>(-1)) {

         BPLOG(ERROR) << "MinidumpModuleList found bad base address "

                         "for module " << module_index << "/" << module_count <<

                         ", " << module->code_file();

         return false;

       }

       if (!range_map_->StoreRange(base_address, module_size, module_index)) {

         BPLOG(ERROR) << "MinidumpModuleList could not store module " <<

                         module_index << "/" << module_count << ", " <<

                         module->code_file() << ", " <<

                         HexString(base_address) << "+" <<

                         HexString(module_size);

         return false;

       }

     }

     modules_ = modules.release();

   }

   module_count_ = module_count;

   valid_ = true;

   return true;

 }

 const MinidumpModule* MinidumpModuleList::GetModuleForAddress(

     uint64_t address) const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModuleList for GetModuleForAddress";

     return NULL;

   }

   unsigned int module_index;

   if (!range_map_->RetrieveRange(address, &module_index, NULL, NULL)) {

     BPLOG(INFO) << "MinidumpModuleList has no module at " <<

                    HexString(address);

     return NULL;

   }

   return GetModuleAtIndex(module_index);

 }

 const MinidumpModule* MinidumpModuleList::GetMainModule() const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModuleList for GetMainModule";

     return NULL;

   }

   // The main code module is the first one present in a minidump file's

   // MDRawModuleList.

   return GetModuleAtIndex(0);

 }

 const MinidumpModule* MinidumpModuleList::GetModuleAtSequence(

     unsigned int sequence) const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModuleList for GetModuleAtSequence";

     return NULL;

   }

   if (sequence >= module_count_) {

     BPLOG(ERROR) << "MinidumpModuleList sequence out of range: " <<

                     sequence << "/" << module_count_;

     return NULL;

   }

   unsigned int module_index;

   if (!range_map_->RetrieveRangeAtIndex(sequence, &module_index, NULL, NULL)) {

     BPLOG(ERROR) << "MinidumpModuleList has no module at sequence " << sequence;

     return NULL;

   }

   return GetModuleAtIndex(module_index);

 }

 const MinidumpModule* MinidumpModuleList::GetModuleAtIndex(

     unsigned int index) const {

   if (!valid_) {

     BPLOG(ERROR) << "Invalid MinidumpModuleList for GetModuleAtIndex";

     return NULL;

   }

   if (index >= module_count_) {

     BPLOG(ERROR) << "MinidumpModuleList index out of range: " <<

                     index << "/" << module_count_;

     return NULL;

   }

   return &(*modules_)[index];

 }

 const CodeModules* MinidumpModuleList::Copy() const {

   return new BasicCodeModules(this);

 }

 void MinidumpModuleList::Print() {

   if (!valid_) {

     BPLOG(ERROR) << "MinidumpModuleList cannot print invalid data";

     return;

   }

   printf("MinidumpModuleList\n");

   printf("  module_count = %d\n", module_count_);

   printf("\n");

   for (unsigned int module_index = 0;

        module_index < module_count_;

        ++module_index) {

     printf("module[%d]\n", module_index);

     (*modules_)[module_index].Print();

   }

 }

 //

 // MinidumpMemoryList

 //

 uint32_t MinidumpMemoryList::max_regions_ = 4096;

 MinidumpMemoryList::MinidumpMemoryList(Minidump* minidump)

     : MinidumpStream(minidump),

       range_map_(new RangeMap<uint64_t, unsigned int>()),

       descriptors_(NULL),

       regions_(NULL),

       region_count_(0) {

 }

 MinidumpMemoryList::~MinidumpMemoryList() {

   delete range_map_;

   delete descriptors_;

   delete regions_;

 }

 bool MinidumpMemoryList::Read(uint32_t expected_size) {

   // Invalidate cached data.

   delete descriptors_;

   descriptors_ = NULL;

   delete regions_;

   regions_ = NULL;

   range_map_->Clear();

   region_count_ = 0;

   valid_ = false;

   uint32_t region_count;

   if (expected_size < sizeof(region_count)) {

     BPLOG(ERROR) << "MinidumpMemoryList count size mismatch, " <<