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 // Copyright (c) 2006, 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.

 #include <string.h>

 #include "common/convert_UTF.h"

 #include "common/scoped_ptr.h"

 #include "common/string_conversion.h"

 #include "common/using_std_string.h"

 namespace google_breakpad {

 using std::vector;

 void UTF8ToUTF16(const char *in, vector<uint16_t> *out) {

   size_t source_length = strlen(in);

   const UTF8 *source_ptr = reinterpret_cast<const UTF8 *>(in);

   const UTF8 *source_end_ptr = source_ptr + source_length;

   // Erase the contents and zero fill to the expected size

   out->clear();

   out->insert(out->begin(), source_length, 0);

   uint16_t *target_ptr = &(*out)[0];

   uint16_t *target_end_ptr = target_ptr + out->capacity() * sizeof(uint16_t);

   ConversionResult result = ConvertUTF8toUTF16(&source_ptr, source_end_ptr,

                                                &target_ptr, target_end_ptr,

                                                strictConversion);

   // Resize to be the size of the # of converted characters + NULL

   out->resize(result == conversionOK ? target_ptr - &(*out)[0] + 1: 0);

 }

 int UTF8ToUTF16Char(const char *in, int in_length, uint16_t out[2]) {

   const UTF8 *source_ptr = reinterpret_cast<const UTF8 *>(in);

   const UTF8 *source_end_ptr = source_ptr + sizeof(char);

   uint16_t *target_ptr = out;

   uint16_t *target_end_ptr = target_ptr + 2 * sizeof(uint16_t);

   out[0] = out[1] = 0;

   // Process one character at a time

   while (1) {

     ConversionResult result = ConvertUTF8toUTF16(&source_ptr, source_end_ptr,

                                                  &target_ptr, target_end_ptr,

                                                  strictConversion);

     if (result == conversionOK)

       return static_cast<int>(source_ptr - reinterpret_cast<const UTF8 *>(in));

     // Add another character to the input stream and try again

     source_ptr = reinterpret_cast<const UTF8 *>(in);

     ++source_end_ptr;

     if (source_end_ptr > reinterpret_cast<const UTF8 *>(in) + in_length)

       break;

   }

   return 0;

 }

 void UTF32ToUTF16(const wchar_t *in, vector<uint16_t> *out) {

   size_t source_length = wcslen(in);

   const UTF32 *source_ptr = reinterpret_cast<const UTF32 *>(in);

   const UTF32 *source_end_ptr = source_ptr + source_length;

   // Erase the contents and zero fill to the expected size

   out->clear();

   out->insert(out->begin(), source_length, 0);

   uint16_t *target_ptr = &(*out)[0];

   uint16_t *target_end_ptr = target_ptr + out->capacity() * sizeof(uint16_t);

   ConversionResult result = ConvertUTF32toUTF16(&source_ptr, source_end_ptr,

                                                 &target_ptr, target_end_ptr,

                                                 strictConversion);

   // Resize to be the size of the # of converted characters + NULL

   out->resize(result == conversionOK ? target_ptr - &(*out)[0] + 1: 0);

 }

 void UTF32ToUTF16Char(wchar_t in, uint16_t out[2]) {

   const UTF32 *source_ptr = reinterpret_cast<const UTF32 *>(&in);

   const UTF32 *source_end_ptr = source_ptr + 1;

   uint16_t *target_ptr = out;

   uint16_t *target_end_ptr = target_ptr + 2 * sizeof(uint16_t);

   out[0] = out[1] = 0;

   ConversionResult result = ConvertUTF32toUTF16(&source_ptr, source_end_ptr,

                                                 &target_ptr, target_end_ptr,

                                                 strictConversion);

   if (result != conversionOK) {

     out[0] = out[1] = 0;

   }

 }

 static inline uint16_t Swap(uint16_t value) {

   return (value >> 8) | static_cast<uint16_t>(value << 8);

 }

 string UTF16ToUTF8(const vector<uint16_t> &in, bool swap) {

   const UTF16 *source_ptr = &in[0];

   scoped_ptr<uint16_t> source_buffer;

   // If we're to swap, we need to make a local copy and swap each byte pair

   if (swap) {

     int idx = 0;

     source_buffer.reset(new uint16_t[in.size()]);

     UTF16 *source_buffer_ptr = source_buffer.get();

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

          it != in.end(); ++it, ++idx)

       source_buffer_ptr[idx] = Swap(*it);

     source_ptr = source_buffer.get();

   }

   // The maximum expansion would be 4x the size of the input string.

   const UTF16 *source_end_ptr = source_ptr + in.size();

   size_t target_capacity = in.size() * 4;

   scoped_array<UTF8> target_buffer(new UTF8[target_capacity]);

   UTF8 *target_ptr = target_buffer.get();

   UTF8 *target_end_ptr = target_ptr + target_capacity;

   ConversionResult result = ConvertUTF16toUTF8(&source_ptr, source_end_ptr, 

                                                &target_ptr, target_end_ptr,

                                                strictConversion);

   if (result == conversionOK) {

     const char *targetPtr = reinterpret_cast<const char *>(target_buffer.get());

     return targetPtr;

   }

   return "";

 }

 }  // namespace google_breakpad