| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <string.h> |
| |
| #include "third_party/hunspell/google/bdict.h" |
| |
| // static |
| bool hunspell::BDict::Verify(const char* bdict_data, size_t bdict_length) { |
| if (bdict_length <= sizeof(hunspell::BDict::Header)) |
| return false; |
| |
| const BDict::Header* header = |
| reinterpret_cast<const hunspell::BDict::Header*>(bdict_data); |
| if (header->signature != hunspell::BDict::SIGNATURE || |
| header->major_version > hunspell::BDict::MAJOR_VERSION || |
| header->dic_offset > bdict_length) |
| return false; |
| |
| // Get the affix header, make sure there is enough room for it. |
| if (header->aff_offset + sizeof(hunspell::BDict::AffHeader) > bdict_length) |
| return false; |
| |
| // Make sure there is enough room for the affix group count dword. |
| const hunspell::BDict::AffHeader* aff_header = |
| reinterpret_cast<const hunspell::BDict::AffHeader*>( |
| &bdict_data[header->aff_offset]); |
| if (aff_header->affix_group_offset + sizeof(uint32_t) > bdict_length) |
| return false; |
| |
| // The new BDICT header has a MD5 digest of the dictionary data. Compare the |
| // MD5 digest of the data with the one in the BDICT header. |
| if (header->major_version >= 2) { |
| base::MD5Digest digest; |
| base::MD5Sum(aff_header, bdict_length - header->aff_offset, &digest); |
| if (memcmp(&digest, &header->digest, sizeof(digest))) |
| return false; |
| } |
| |
| return true; |
| } |