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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "extensions/common/crx_file.h" | |
| 6 | |
| 7 namespace extensions { | |
| 8 | |
| 9 namespace { | |
| 10 | |
| 11 // The current version of the crx format. | |
| 12 static const uint32 kCurrentVersion = 2; | |
| 13 | |
| 14 // The current version of the crx diff format. | |
| 15 static const uint32 kCurrentDiffVersion = 0; | |
| 16 | |
| 17 // The maximum size the crx parser will tolerate for a public key. | |
| 18 static const uint32 kMaxPublicKeySize = 1 << 16; | |
| 19 | |
| 20 // The maximum size the crx parser will tolerate for a signature. | |
| 21 static const uint32 kMaxSignatureSize = 1 << 16; | |
| 22 | |
| 23 } // namespace | |
| 24 | |
| 25 // The magic string embedded in the header. | |
| 26 const char kCrxFileHeaderMagic[] = "Cr24"; | |
| 27 const char kCrxDiffFileHeaderMagic[] = "CrOD"; | |
| 28 | |
| 29 scoped_ptr<CrxFile> CrxFile::Parse(const CrxFile::Header& header, | |
| 30 CrxFile::Error* error) { | |
| 31 if (HeaderIsValid(header, error)) | |
| 32 return scoped_ptr<CrxFile>(new CrxFile(header)); | |
| 33 return scoped_ptr<CrxFile>(); | |
| 34 } | |
| 35 | |
| 36 scoped_ptr<CrxFile> CrxFile::Create(const uint32 key_size, | |
| 37 const uint32 signature_size, | |
| 38 CrxFile::Error* error) { | |
| 39 CrxFile::Header header; | |
| 40 memcpy(&header.magic, kCrxFileHeaderMagic, kCrxFileHeaderMagicSize); | |
| 41 header.version = kCurrentVersion; | |
| 42 header.key_size = key_size; | |
| 43 header.signature_size = signature_size; | |
| 44 if (HeaderIsValid(header, error)) | |
| 45 return scoped_ptr<CrxFile>(new CrxFile(header)); | |
| 46 return scoped_ptr<CrxFile>(); | |
| 47 } | |
| 48 | |
| 49 CrxFile::CrxFile(const Header& header) : header_(header) { | |
| 50 } | |
| 51 | |
| 52 bool CrxFile::HeaderIsDelta(const CrxFile::Header& header) { | |
| 53 return !strncmp(kCrxDiffFileHeaderMagic, header.magic, sizeof(header.magic)); | |
| 54 } | |
| 55 | |
| 56 bool CrxFile::HeaderIsValid(const CrxFile::Header& header, | |
| 57 CrxFile::Error* error) { | |
| 58 bool valid = false; | |
| 59 bool diffCrx = false; | |
| 60 if (!strncmp(kCrxDiffFileHeaderMagic, header.magic, sizeof(header.magic))) | |
| 61 diffCrx = true; | |
| 62 if (strncmp(kCrxFileHeaderMagic, header.magic, sizeof(header.magic)) && | |
| 63 !diffCrx) | |
| 64 *error = kWrongMagic; | |
| 65 else if (header.version != kCurrentVersion | |
| 66 && !(diffCrx && header.version == kCurrentDiffVersion)) | |
| 67 *error = kInvalidVersion; | |
| 68 else if (header.key_size > kMaxPublicKeySize) | |
| 69 *error = kInvalidKeyTooLarge; | |
| 70 else if (header.key_size == 0) | |
| 71 *error = kInvalidKeyTooSmall; | |
| 72 else if (header.signature_size > kMaxSignatureSize) | |
| 73 *error = kInvalidSignatureTooLarge; | |
| 74 else if (header.signature_size == 0) | |
| 75 *error = kInvalidSignatureTooSmall; | |
| 76 else | |
| 77 valid = true; | |
| 78 return valid; | |
| 79 } | |
| 80 | |
| 81 } // namespace extensions | |
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Chromium Code Reviews
Issue 474633005:
Componentize component_updater: Split crx_file code off into its own component. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src