1 // Protocol Buffers - Google's data interchange format 2 // Copyright 2008 Google Inc. All rights reserved. 3 // http://code.google.com/p/protobuf/ 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 // Author: ambrose (at) google.com (Ambrose Feinstein), 32 // kenton (at) google.com (Kenton Varda) 33 // 34 // Based on http://www.pkware.com/documents/casestudies/APPNOTE.TXT 35 36 #include <google/protobuf/compiler/zip_writer.h> 37 #include <google/protobuf/io/coded_stream.h> 38 39 namespace google { 40 namespace protobuf { 41 namespace compiler { 42 43 static const uint32 kCRC32Table[256] = { 44 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 45 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 46 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 47 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 48 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 49 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 50 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 51 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 52 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 53 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 54 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 55 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 56 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 57 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 58 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 59 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 60 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 61 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 62 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 63 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 64 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 65 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 66 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 67 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 68 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 69 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 70 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 71 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 72 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 73 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 74 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 75 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 76 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 77 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 78 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 79 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 80 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 81 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 82 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 83 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 84 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 85 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 86 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d 87 }; 88 89 static uint32 ComputeCRC32(const string &buf) { 90 uint32 x = ~0U; 91 for (int i = 0; i < buf.size(); ++i) { 92 unsigned char c = buf[i]; 93 x = kCRC32Table[(x ^ c) & 0xff] ^ (x >> 8); 94 } 95 return ~x; 96 } 97 98 static void WriteShort(io::CodedOutputStream *out, uint16 val) { 99 uint8 p[2]; 100 p[0] = static_cast<uint8>(val); 101 p[1] = static_cast<uint8>(val >> 8); 102 out->WriteRaw(p, 2); 103 } 104 105 ZipWriter::ZipWriter(io::ZeroCopyOutputStream* raw_output) 106 : raw_output_(raw_output) {} 107 ZipWriter::~ZipWriter() {} 108 109 bool ZipWriter::Write(const string& filename, const string& contents) { 110 FileInfo info; 111 112 info.name = filename; 113 uint16 filename_size = filename.size(); 114 info.offset = raw_output_->ByteCount(); 115 info.size = contents.size(); 116 info.crc32 = ComputeCRC32(contents); 117 118 files_.push_back(info); 119 120 // write file header 121 io::CodedOutputStream output(raw_output_); 122 output.WriteLittleEndian32(0x04034b50); // magic 123 WriteShort(&output, 10); // version needed to extract 124 WriteShort(&output, 0); // flags 125 WriteShort(&output, 0); // compression method: stored 126 WriteShort(&output, 0); // last modified time 127 WriteShort(&output, 0); // last modified date 128 output.WriteLittleEndian32(info.crc32); // crc-32 129 output.WriteLittleEndian32(info.size); // compressed size 130 output.WriteLittleEndian32(info.size); // uncompressed size 131 WriteShort(&output, filename_size); // file name length 132 WriteShort(&output, 0); // extra field length 133 output.WriteString(filename); // file name 134 output.WriteString(contents); // file data 135 136 return !output.HadError(); 137 } 138 139 bool ZipWriter::WriteDirectory() { 140 uint16 num_entries = files_.size(); 141 uint32 dir_ofs = raw_output_->ByteCount(); 142 143 // write central directory 144 io::CodedOutputStream output(raw_output_); 145 for (int i = 0; i < num_entries; ++i) { 146 const string &filename = files_[i].name; 147 uint16 filename_size = filename.size(); 148 uint32 crc32 = files_[i].crc32; 149 uint32 size = files_[i].size; 150 uint32 offset = files_[i].offset; 151 152 output.WriteLittleEndian32(0x02014b50); // magic 153 WriteShort(&output, 10); // version made by 154 WriteShort(&output, 10); // version needed to extract 155 WriteShort(&output, 0); // flags 156 WriteShort(&output, 0); // compression method: stored 157 WriteShort(&output, 0); // last modified time 158 WriteShort(&output, 0); // last modified date 159 output.WriteLittleEndian32(crc32); // crc-32 160 output.WriteLittleEndian32(size); // compressed size 161 output.WriteLittleEndian32(size); // uncompressed size 162 WriteShort(&output, filename_size); // file name length 163 WriteShort(&output, 0); // extra field length 164 WriteShort(&output, 0); // file comment length 165 WriteShort(&output, 0); // starting disk number 166 WriteShort(&output, 0); // internal file attributes 167 output.WriteLittleEndian32(0); // external file attributes 168 output.WriteLittleEndian32(offset); // local header offset 169 output.WriteString(filename); // file name 170 } 171 uint32 dir_len = output.ByteCount(); 172 173 // write end of central directory marker 174 output.WriteLittleEndian32(0x06054b50); // magic 175 WriteShort(&output, 0); // disk number 176 WriteShort(&output, 0); // disk with start of central directory 177 WriteShort(&output, num_entries); // central directory entries (this disk) 178 WriteShort(&output, num_entries); // central directory entries (total) 179 output.WriteLittleEndian32(dir_len); // central directory byte size 180 output.WriteLittleEndian32(dir_ofs); // central directory offset 181 WriteShort(&output, 0); // comment length 182 183 return output.HadError(); 184 } 185 186 } // namespace google 187 } // namespace protobuf 188 } // namespace compiler 189
