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      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