The Tor Browser: toolkit/crashreporter/google-breakpad/src/processor/static

toolkit/crashreporter/google-breakpad/src/processor/static_map-inl.h@b8a032363ba2 (annotated)

toolkit/crashreporter/google-breakpad/src/processor/static_map-inl.h

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 // Copyright 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.
 // static_map-inl.h: StaticMap implementation.
 //
 // See static_map.h for documentation.
 //
 // Author: Siyang Xie (lambxsy@google.com)
 #ifndef PROCESSOR_STATIC_MAP_INL_H__
 #define PROCESSOR_STATIC_MAP_INL_H__
 #include "processor/static_map.h"
 #include "processor/static_map_iterator-inl.h"
 #include "common/logging.h"
 namespace google_breakpad {
 template<typename Key, typename Value, typename Compare>
 StaticMap<Key, Value, Compare>::StaticMap(const char* raw_data)
     : raw_data_(raw_data),
       compare_() {
   // First 4 Bytes store the number of nodes.
   num_nodes_ = *(reinterpret_cast<const uint32_t*>(raw_data_));
   offsets_ = reinterpret_cast<const uint32_t*>(
       raw_data_ + sizeof(num_nodes_));
   keys_ = reinterpret_cast<const Key*>(
       raw_data_ + (1 + num_nodes_) * sizeof(uint32_t));
 }
 // find(), lower_bound() and upper_bound() implement binary search algorithm.
 template<typename Key, typename Value, typename Compare>
 StaticMapIterator<Key, Value, Compare>
 StaticMap<Key, Value, Compare>::find(const Key &key) const {
   int begin = 0;
   int end = num_nodes_;
   int middle;
   int compare_result;
   while (begin < end) {
     middle = begin + (end - begin) / 2;
     compare_result = compare_(key, GetKeyAtIndex(middle));
     if (compare_result == 0)
       return IteratorAtIndex(middle);
     if (compare_result < 0) {
       end = middle;
     } else {
       begin = middle + 1;
     }
   }
   return this->end();
 }
 template<typename Key, typename Value, typename Compare>
 StaticMapIterator<Key, Value, Compare>
 StaticMap<Key, Value, Compare>::lower_bound(const Key &key) const {
   int begin = 0;
   int end = num_nodes_;
   int middle;
   int comp_result;
   while (begin < end) {
     middle = begin + (end - begin) / 2;
     comp_result = compare_(key, GetKeyAtIndex(middle));
     if (comp_result == 0)
       return IteratorAtIndex(middle);
     if (comp_result < 0) {
       end = middle;
     } else {
       begin = middle + 1;
     }
   }
   return IteratorAtIndex(begin);
 }
 template<typename Key, typename Value, typename Compare>
 StaticMapIterator<Key, Value, Compare>
 StaticMap<Key, Value, Compare>::upper_bound(const Key &key) const {
   int begin = 0;
   int end = num_nodes_;
   int middle;
   int compare_result;
   while (begin < end) {
     middle = begin + (end - begin) / 2;
     compare_result = compare_(key, GetKeyAtIndex(middle));
     if (compare_result == 0)
       return IteratorAtIndex(middle + 1);
     if (compare_result < 0) {
       end = middle;
     } else {
       begin = middle + 1;
     }
   }
   return IteratorAtIndex(begin);
 }
 template<typename Key, typename Value, typename Compare>
 bool StaticMap<Key, Value, Compare>::ValidateInMemoryStructure() const {
   // check the number of nodes is non-negative:
   if (!raw_data_) return false;
   int32_t num_nodes = *(reinterpret_cast<const int32_t*>(raw_data_));
   if (num_nodes < 0) {
     BPLOG(INFO) << "StaticMap check failed: negative number of nodes";
     return false;
   }
   int node_index = 0;
   if (num_nodes_) {
     uint64_t first_offset = sizeof(int32_t) * (num_nodes_ + 1)
                            + sizeof(Key) * num_nodes_;
     // Num_nodes_ is too large.
     if (first_offset > 0xffffffffUL) {
       BPLOG(INFO) << "StaticMap check failed: size exceeds limit";
       return false;
     }
     if (offsets_[node_index] != static_cast<uint32_t>(first_offset)) {
       BPLOG(INFO) << "StaticMap check failed: first node offset is incorrect";
       return false;
     }
   }
   for (node_index = 1; node_index < num_nodes_; ++node_index) {
     // Check offsets[i] is strictly increasing:
     if (offsets_[node_index] <= offsets_[node_index - 1]) {
       BPLOG(INFO) << "StaticMap check failed: node offsets non-increasing";
       return false;
     }
     // Check Key[i] is strictly increasing as no duplicate keys are allowed.
     if (compare_(GetKeyAtIndex(node_index),
                  GetKeyAtIndex(node_index - 1)) <= 0) {
       BPLOG(INFO) << "StaticMap check failed: node keys non-increasing";
       return false;
     }
   }
   return true;
 }
 template<typename Key, typename Value, typename Compare>
 const Key StaticMap<Key, Value, Compare>::GetKeyAtIndex(int index) const {
   if (index < 0 || index >= num_nodes_) {
     BPLOG(ERROR) << "Key index out of range error";
     // Key type is required to be primitive type.  Return 0 if index is invalid.
     return 0;
   }
   return keys_[index];
 }
 }  // namespace google_breakpad
 #endif  // PROCESSOR_STATIC_MAP_INL_H__

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toolkit/crashreporter/google-breakpad/src/processor/static_map-inl.h@b8a032363ba2 (annotated)

toolkit/crashreporter/google-breakpad/src/processor/static_map-inl.h