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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "components/compression/compression_utils.h" | 5 #include "components/compression/compression_utils.h" |
6 | 6 |
| 7 #include <stddef.h> |
| 8 #include <stdint.h> |
| 9 #include <string.h> |
| 10 |
7 #include <vector> | 11 #include <vector> |
8 | 12 |
9 #include "base/basictypes.h" | |
10 #include "base/logging.h" | 13 #include "base/logging.h" |
11 #include "base/sys_byteorder.h" | 14 #include "base/sys_byteorder.h" |
12 #include "third_party/zlib/zlib.h" | 15 #include "third_party/zlib/zlib.h" |
13 | 16 |
14 namespace { | 17 namespace { |
15 | 18 |
16 // The difference in bytes between a zlib header and a gzip header. | 19 // The difference in bytes between a zlib header and a gzip header. |
17 const size_t kGzipZlibHeaderDifferenceBytes = 16; | 20 const size_t kGzipZlibHeaderDifferenceBytes = 16; |
18 | 21 |
19 // Pass an integer greater than the following get a gzip header instead of a | 22 // Pass an integer greater than the following get a gzip header instead of a |
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104 return Z_DATA_ERROR; | 107 return Z_DATA_ERROR; |
105 return err; | 108 return err; |
106 } | 109 } |
107 *dest_length = stream.total_out; | 110 *dest_length = stream.total_out; |
108 | 111 |
109 err = inflateEnd(&stream); | 112 err = inflateEnd(&stream); |
110 return err; | 113 return err; |
111 } | 114 } |
112 | 115 |
113 // Returns the uncompressed size from GZIP-compressed |compressed_data|. | 116 // Returns the uncompressed size from GZIP-compressed |compressed_data|. |
114 uint32 GetUncompressedSize(const std::string& compressed_data) { | 117 uint32_t GetUncompressedSize(const std::string& compressed_data) { |
115 // The uncompressed size is stored in the last 4 bytes of |input| in LE. | 118 // The uncompressed size is stored in the last 4 bytes of |input| in LE. |
116 uint32 size; | 119 uint32_t size; |
117 if (compressed_data.length() < sizeof(size)) | 120 if (compressed_data.length() < sizeof(size)) |
118 return 0; | 121 return 0; |
119 memcpy(&size, &compressed_data[compressed_data.length() - sizeof(size)], | 122 memcpy(&size, &compressed_data[compressed_data.length() - sizeof(size)], |
120 sizeof(size)); | 123 sizeof(size)); |
121 return base::ByteSwapToLE32(size); | 124 return base::ByteSwapToLE32(size); |
122 } | 125 } |
123 | 126 |
124 } // namespace | 127 } // namespace |
125 | 128 |
126 namespace compression { | 129 namespace compression { |
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152 &uncompressed_size, | 155 &uncompressed_size, |
153 bit_cast<const Bytef*>(input.data()), | 156 bit_cast<const Bytef*>(input.data()), |
154 static_cast<uLongf>(input.length())) == Z_OK) { | 157 static_cast<uLongf>(input.length())) == Z_OK) { |
155 output->swap(uncompressed_output); | 158 output->swap(uncompressed_output); |
156 return true; | 159 return true; |
157 } | 160 } |
158 return false; | 161 return false; |
159 } | 162 } |
160 | 163 |
161 } // namespace compression | 164 } // namespace compression |
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