Line data Source code
1 : // Protocol Buffers - Google's data interchange format
2 : // Copyright 2008 Google Inc. All rights reserved.
3 : // https://developers.google.com/protocol-buffers/
4 : //
5 : // Redistribution and use in source and binary forms, with or without
6 : // modification, are permitted provided that the following conditions are
7 : // met:
8 : //
9 : // * Redistributions of source code must retain the above copyright
10 : // notice, this list of conditions and the following disclaimer.
11 : // * Redistributions in binary form must reproduce the above
12 : // copyright notice, this list of conditions and the following disclaimer
13 : // in the documentation and/or other materials provided with the
14 : // distribution.
15 : // * Neither the name of Google Inc. nor the names of its
16 : // contributors may be used to endorse or promote products derived from
17 : // this software without specific prior written permission.
18 : //
19 : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 :
31 : // Protocol Buffers - Google's data interchange format
32 : // Copyright 2008 Google Inc. All rights reserved.
33 : // https://developers.google.com/protocol-buffers/
34 : //
35 : // Redistribution and use in source and binary forms, with or without
36 : // modification, are permitted provided that the following conditions are
37 : // met:
38 : //
39 : // * Redistributions of source code must retain the above copyright
40 : // notice, this list of conditions and the following disclaimer.
41 : // * Redistributions in binary form must reproduce the above
42 : // copyright notice, this list of conditions and the following disclaimer
43 : // in the documentation and/or other materials provided with the
44 : // distribution.
45 : // * Neither the name of Google Inc. nor the names of its
46 : // contributors may be used to endorse or promote products derived from
47 : // this software without specific prior written permission.
48 : //
49 : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
50 : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
51 : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
52 : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
53 : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
54 : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
55 : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
59 : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
60 :
61 : // Author: ambrose@google.com (Ambrose Feinstein),
62 : // kenton@google.com (Kenton Varda)
63 : //
64 : // Based on http://www.pkware.com/documents/casestudies/APPNOTE.TXT
65 :
66 : #include <google/protobuf/compiler/zip_writer.h>
67 : #include <google/protobuf/io/coded_stream.h>
68 :
69 : namespace google {
70 : namespace protobuf {
71 : namespace compiler {
72 :
73 : static const uint32 kCRC32Table[256] = {
74 : 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
75 : 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
76 : 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
77 : 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
78 : 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
79 : 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
80 : 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
81 : 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
82 : 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
83 : 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
84 : 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
85 : 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
86 : 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
87 : 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
88 : 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
89 : 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
90 : 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
91 : 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
92 : 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
93 : 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
94 : 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
95 : 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
96 : 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
97 : 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
98 : 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
99 : 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
100 : 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
101 : 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
102 : 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
103 : 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
104 : 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
105 : 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
106 : 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
107 : 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
108 : 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
109 : 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
110 : 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
111 : 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
112 : 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
113 : 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
114 : 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
115 : 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
116 : 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
117 : };
118 :
119 : static uint32 ComputeCRC32(const string &buf) {
120 0 : uint32 x = ~0U;
121 0 : for (int i = 0; i < buf.size(); ++i) {
122 0 : unsigned char c = buf[i];
123 0 : x = kCRC32Table[(x ^ c) & 0xff] ^ (x >> 8);
124 : }
125 0 : return ~x;
126 : }
127 :
128 : static void WriteShort(io::CodedOutputStream *out, uint16 val) {
129 : uint8 p[2];
130 0 : p[0] = static_cast<uint8>(val);
131 0 : p[1] = static_cast<uint8>(val >> 8);
132 0 : out->WriteRaw(p, 2);
133 : }
134 :
135 0 : ZipWriter::ZipWriter(io::ZeroCopyOutputStream* raw_output)
136 0 : : raw_output_(raw_output) {}
137 0 : ZipWriter::~ZipWriter() {}
138 :
139 0 : bool ZipWriter::Write(const string& filename, const string& contents) {
140 : FileInfo info;
141 :
142 : info.name = filename;
143 0 : uint16 filename_size = filename.size();
144 0 : info.offset = raw_output_->ByteCount();
145 0 : info.size = contents.size();
146 0 : info.crc32 = ComputeCRC32(contents);
147 :
148 0 : files_.push_back(info);
149 :
150 : // write file header
151 0 : io::CodedOutputStream output(raw_output_);
152 0 : output.WriteLittleEndian32(0x04034b50); // magic
153 : WriteShort(&output, 10); // version needed to extract
154 : WriteShort(&output, 0); // flags
155 : WriteShort(&output, 0); // compression method: stored
156 : WriteShort(&output, 0); // last modified time
157 : WriteShort(&output, 0); // last modified date
158 0 : output.WriteLittleEndian32(info.crc32); // crc-32
159 0 : output.WriteLittleEndian32(info.size); // compressed size
160 0 : output.WriteLittleEndian32(info.size); // uncompressed size
161 0 : WriteShort(&output, filename_size); // file name length
162 : WriteShort(&output, 0); // extra field length
163 : output.WriteString(filename); // file name
164 : output.WriteString(contents); // file data
165 :
166 0 : return !output.HadError();
167 : }
168 :
169 0 : bool ZipWriter::WriteDirectory() {
170 0 : uint16 num_entries = files_.size();
171 0 : uint32 dir_ofs = raw_output_->ByteCount();
172 :
173 : // write central directory
174 0 : io::CodedOutputStream output(raw_output_);
175 0 : for (int i = 0; i < num_entries; ++i) {
176 0 : const string &filename = files_[i].name;
177 0 : uint16 filename_size = filename.size();
178 0 : uint32 crc32 = files_[i].crc32;
179 0 : uint32 size = files_[i].size;
180 0 : uint32 offset = files_[i].offset;
181 :
182 0 : output.WriteLittleEndian32(0x02014b50); // magic
183 : WriteShort(&output, 10); // version made by
184 : WriteShort(&output, 10); // version needed to extract
185 : WriteShort(&output, 0); // flags
186 : WriteShort(&output, 0); // compression method: stored
187 : WriteShort(&output, 0); // last modified time
188 : WriteShort(&output, 0); // last modified date
189 0 : output.WriteLittleEndian32(crc32); // crc-32
190 0 : output.WriteLittleEndian32(size); // compressed size
191 0 : output.WriteLittleEndian32(size); // uncompressed size
192 0 : WriteShort(&output, filename_size); // file name length
193 : WriteShort(&output, 0); // extra field length
194 : WriteShort(&output, 0); // file comment length
195 : WriteShort(&output, 0); // starting disk number
196 : WriteShort(&output, 0); // internal file attributes
197 0 : output.WriteLittleEndian32(0); // external file attributes
198 0 : output.WriteLittleEndian32(offset); // local header offset
199 : output.WriteString(filename); // file name
200 : }
201 0 : uint32 dir_len = output.ByteCount();
202 :
203 : // write end of central directory marker
204 0 : output.WriteLittleEndian32(0x06054b50); // magic
205 : WriteShort(&output, 0); // disk number
206 : WriteShort(&output, 0); // disk with start of central directory
207 0 : WriteShort(&output, num_entries); // central directory entries (this disk)
208 0 : WriteShort(&output, num_entries); // central directory entries (total)
209 0 : output.WriteLittleEndian32(dir_len); // central directory byte size
210 0 : output.WriteLittleEndian32(dir_ofs); // central directory offset
211 : WriteShort(&output, 0); // comment length
212 :
213 0 : return output.HadError();
214 : }
215 :
216 : } // namespace compiler
217 : } // namespace protobuf
218 : } // namespace google
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