Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 17 | #include "ziparchive/zip_writer.h" |
| 18 | |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 19 | #include <sys/param.h> |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 20 | #include <sys/stat.h> |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 21 | #include <zlib.h> |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 22 | #include <cstdio> |
| 23 | #define DEF_MEM_LEVEL 8 // normally in zutil.h? |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 24 | |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 25 | #include <memory> |
| 26 | #include <vector> |
| 27 | |
| 28 | #include "android-base/logging.h" |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 29 | |
| 30 | #include "entry_name_utils-inl.h" |
| 31 | #include "zip_archive_common.h" |
| 32 | |
Nick Kralevich | 622f9b3 | 2019-03-27 07:46:39 -0700 | [diff] [blame] | 33 | #undef powerof2 |
| 34 | #define powerof2(x) \ |
| 35 | ({ \ |
| 36 | __typeof__(x) _x = (x); \ |
| 37 | __typeof__(x) _x2; \ |
| 38 | __builtin_add_overflow(_x, -1, &_x2) ? 1 : ((_x2 & _x) == 0); \ |
| 39 | }) |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 40 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 41 | /* Zip compression methods we support */ |
| 42 | enum { |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 43 | kCompressStored = 0, // no compression |
| 44 | kCompressDeflated = 8, // standard deflate |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 45 | }; |
| 46 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 47 | // Size of the output buffer used for compression. |
| 48 | static const size_t kBufSize = 32768u; |
| 49 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 50 | // No error, operation completed successfully. |
| 51 | static const int32_t kNoError = 0; |
| 52 | |
| 53 | // The ZipWriter is in a bad state. |
| 54 | static const int32_t kInvalidState = -1; |
| 55 | |
| 56 | // There was an IO error while writing to disk. |
| 57 | static const int32_t kIoError = -2; |
| 58 | |
| 59 | // The zip entry name was invalid. |
| 60 | static const int32_t kInvalidEntryName = -3; |
| 61 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 62 | // An error occurred in zlib. |
| 63 | static const int32_t kZlibError = -4; |
| 64 | |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 65 | // The start aligned function was called with the aligned flag. |
| 66 | static const int32_t kInvalidAlign32Flag = -5; |
| 67 | |
| 68 | // The alignment parameter is not a power of 2. |
| 69 | static const int32_t kInvalidAlignment = -6; |
| 70 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 71 | static const char* sErrorCodes[] = { |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 72 | "Invalid state", "IO error", "Invalid entry name", "Zlib error", |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 73 | }; |
| 74 | |
| 75 | const char* ZipWriter::ErrorCodeString(int32_t error_code) { |
| 76 | if (error_code < 0 && (-error_code) < static_cast<int32_t>(arraysize(sErrorCodes))) { |
| 77 | return sErrorCodes[-error_code]; |
| 78 | } |
| 79 | return nullptr; |
| 80 | } |
| 81 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 82 | static void DeleteZStream(z_stream* stream) { |
| 83 | deflateEnd(stream); |
| 84 | delete stream; |
| 85 | } |
| 86 | |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 87 | ZipWriter::ZipWriter(FILE* f) |
| 88 | : file_(f), |
| 89 | seekable_(false), |
| 90 | current_offset_(0), |
| 91 | state_(State::kWritingZip), |
| 92 | z_stream_(nullptr, DeleteZStream), |
| 93 | buffer_(kBufSize) { |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 94 | // Check if the file is seekable (regular file). If fstat fails, that's fine, subsequent calls |
| 95 | // will fail as well. |
| 96 | struct stat file_stats; |
| 97 | if (fstat(fileno(f), &file_stats) == 0) { |
| 98 | seekable_ = S_ISREG(file_stats.st_mode); |
| 99 | } |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 100 | } |
| 101 | |
Chih-Hung Hsieh | bb79eac | 2018-09-25 11:16:22 -0700 | [diff] [blame] | 102 | ZipWriter::ZipWriter(ZipWriter&& writer) noexcept |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 103 | : file_(writer.file_), |
| 104 | seekable_(writer.seekable_), |
| 105 | current_offset_(writer.current_offset_), |
| 106 | state_(writer.state_), |
| 107 | files_(std::move(writer.files_)), |
| 108 | z_stream_(std::move(writer.z_stream_)), |
| 109 | buffer_(std::move(writer.buffer_)) { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 110 | writer.file_ = nullptr; |
| 111 | writer.state_ = State::kError; |
| 112 | } |
| 113 | |
Chih-Hung Hsieh | bb79eac | 2018-09-25 11:16:22 -0700 | [diff] [blame] | 114 | ZipWriter& ZipWriter::operator=(ZipWriter&& writer) noexcept { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 115 | file_ = writer.file_; |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 116 | seekable_ = writer.seekable_; |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 117 | current_offset_ = writer.current_offset_; |
| 118 | state_ = writer.state_; |
| 119 | files_ = std::move(writer.files_); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 120 | z_stream_ = std::move(writer.z_stream_); |
| 121 | buffer_ = std::move(writer.buffer_); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 122 | writer.file_ = nullptr; |
| 123 | writer.state_ = State::kError; |
| 124 | return *this; |
| 125 | } |
| 126 | |
| 127 | int32_t ZipWriter::HandleError(int32_t error_code) { |
| 128 | state_ = State::kError; |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 129 | z_stream_.reset(); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 130 | return error_code; |
| 131 | } |
| 132 | |
Yurii Zubrytskyi | 5338b87 | 2019-06-17 14:26:30 -0700 | [diff] [blame] | 133 | int32_t ZipWriter::StartEntry(std::string_view path, size_t flags) { |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 134 | uint32_t alignment = 0; |
| 135 | if (flags & kAlign32) { |
| 136 | flags &= ~kAlign32; |
| 137 | alignment = 4; |
| 138 | } |
| 139 | return StartAlignedEntryWithTime(path, flags, time_t(), alignment); |
| 140 | } |
| 141 | |
Yurii Zubrytskyi | 5338b87 | 2019-06-17 14:26:30 -0700 | [diff] [blame] | 142 | int32_t ZipWriter::StartAlignedEntry(std::string_view path, size_t flags, uint32_t alignment) { |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 143 | return StartAlignedEntryWithTime(path, flags, time_t(), alignment); |
| 144 | } |
| 145 | |
Yurii Zubrytskyi | 5338b87 | 2019-06-17 14:26:30 -0700 | [diff] [blame] | 146 | int32_t ZipWriter::StartEntryWithTime(std::string_view path, size_t flags, time_t time) { |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 147 | uint32_t alignment = 0; |
| 148 | if (flags & kAlign32) { |
| 149 | flags &= ~kAlign32; |
| 150 | alignment = 4; |
| 151 | } |
| 152 | return StartAlignedEntryWithTime(path, flags, time, alignment); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | static void ExtractTimeAndDate(time_t when, uint16_t* out_time, uint16_t* out_date) { |
| 156 | /* round up to an even number of seconds */ |
| 157 | when = static_cast<time_t>((static_cast<unsigned long>(when) + 1) & (~1)); |
| 158 | |
| 159 | struct tm* ptm; |
| 160 | #if !defined(_WIN32) |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 161 | struct tm tm_result; |
| 162 | ptm = localtime_r(&when, &tm_result); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 163 | #else |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 164 | ptm = localtime(&when); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 165 | #endif |
| 166 | |
| 167 | int year = ptm->tm_year; |
| 168 | if (year < 80) { |
| 169 | year = 80; |
| 170 | } |
| 171 | |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 172 | *out_date = static_cast<uint16_t>((year - 80) << 9 | (ptm->tm_mon + 1) << 5 | ptm->tm_mday); |
| 173 | *out_time = static_cast<uint16_t>(ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 176 | static void CopyFromFileEntry(const ZipWriter::FileEntry& src, bool use_data_descriptor, |
| 177 | LocalFileHeader* dst) { |
| 178 | dst->lfh_signature = LocalFileHeader::kSignature; |
| 179 | if (use_data_descriptor) { |
| 180 | // Set this flag to denote that a DataDescriptor struct will appear after the data, |
| 181 | // containing the crc and size fields. |
| 182 | dst->gpb_flags |= kGPBDDFlagMask; |
| 183 | |
| 184 | // The size and crc fields must be 0. |
| 185 | dst->compressed_size = 0u; |
| 186 | dst->uncompressed_size = 0u; |
| 187 | dst->crc32 = 0u; |
| 188 | } else { |
| 189 | dst->compressed_size = src.compressed_size; |
| 190 | dst->uncompressed_size = src.uncompressed_size; |
| 191 | dst->crc32 = src.crc32; |
| 192 | } |
| 193 | dst->compression_method = src.compression_method; |
| 194 | dst->last_mod_time = src.last_mod_time; |
| 195 | dst->last_mod_date = src.last_mod_date; |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 196 | DCHECK_LE(src.path.size(), std::numeric_limits<uint16_t>::max()); |
| 197 | dst->file_name_length = static_cast<uint16_t>(src.path.size()); |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 198 | dst->extra_field_length = src.padding_length; |
| 199 | } |
| 200 | |
Yurii Zubrytskyi | 5338b87 | 2019-06-17 14:26:30 -0700 | [diff] [blame] | 201 | int32_t ZipWriter::StartAlignedEntryWithTime(std::string_view path, size_t flags, time_t time, |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 202 | uint32_t alignment) { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 203 | if (state_ != State::kWritingZip) { |
| 204 | return kInvalidState; |
| 205 | } |
| 206 | |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 207 | // Can only have 16535 entries because of zip records. |
| 208 | if (files_.size() == std::numeric_limits<uint16_t>::max()) { |
| 209 | return HandleError(kIoError); |
| 210 | } |
| 211 | |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 212 | if (flags & kAlign32) { |
| 213 | return kInvalidAlign32Flag; |
| 214 | } |
| 215 | |
| 216 | if (powerof2(alignment) == 0) { |
| 217 | return kInvalidAlignment; |
| 218 | } |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 219 | if (alignment > std::numeric_limits<uint16_t>::max()) { |
| 220 | return kInvalidAlignment; |
| 221 | } |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 222 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 223 | FileEntry file_entry = {}; |
| 224 | file_entry.local_file_header_offset = current_offset_; |
| 225 | file_entry.path = path; |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 226 | // No support for larger than 4GB files. |
| 227 | if (file_entry.local_file_header_offset > std::numeric_limits<uint32_t>::max()) { |
| 228 | return HandleError(kIoError); |
| 229 | } |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 230 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 231 | if (!IsValidEntryName(reinterpret_cast<const uint8_t*>(file_entry.path.data()), |
| 232 | file_entry.path.size())) { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 233 | return kInvalidEntryName; |
| 234 | } |
| 235 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 236 | if (flags & ZipWriter::kCompress) { |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 237 | file_entry.compression_method = kCompressDeflated; |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 238 | |
| 239 | int32_t result = PrepareDeflate(); |
| 240 | if (result != kNoError) { |
| 241 | return result; |
| 242 | } |
| 243 | } else { |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 244 | file_entry.compression_method = kCompressStored; |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 245 | } |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 246 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 247 | ExtractTimeAndDate(time, &file_entry.last_mod_time, &file_entry.last_mod_date); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 248 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 249 | off_t offset = current_offset_ + sizeof(LocalFileHeader) + file_entry.path.size(); |
Yurii Zubrytskyi | bb0e58f | 2019-06-17 15:43:16 -0700 | [diff] [blame] | 250 | // prepare a pre-zeroed memory page in case when we need to pad some aligned data. |
| 251 | static constexpr auto kPageSize = 4096; |
| 252 | static constexpr char kSmallZeroPadding[kPageSize] = {}; |
| 253 | // use this buffer if our preallocated one is too small |
| 254 | std::vector<char> zero_padding_big; |
| 255 | const char* zero_padding = nullptr; |
| 256 | |
Christopher Ferris | 72082ab | 2016-01-19 10:33:03 -0800 | [diff] [blame] | 257 | if (alignment != 0 && (offset & (alignment - 1))) { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 258 | // Pad the extra field so the data will be aligned. |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 259 | uint16_t padding = static_cast<uint16_t>(alignment - (offset % alignment)); |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 260 | file_entry.padding_length = padding; |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 261 | offset += padding; |
Yurii Zubrytskyi | bb0e58f | 2019-06-17 15:43:16 -0700 | [diff] [blame] | 262 | if (padding <= std::size(kSmallZeroPadding)) { |
| 263 | zero_padding = kSmallZeroPadding; |
| 264 | } else { |
| 265 | zero_padding_big.resize(padding, 0); |
| 266 | zero_padding = zero_padding_big.data(); |
| 267 | } |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 268 | } |
| 269 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 270 | LocalFileHeader header = {}; |
| 271 | // Always start expecting a data descriptor. When the data has finished being written, |
| 272 | // if it is possible to seek back, the GPB flag will reset and the sizes written. |
| 273 | CopyFromFileEntry(file_entry, true /*use_data_descriptor*/, &header); |
| 274 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 275 | if (fwrite(&header, sizeof(header), 1, file_) != 1) { |
| 276 | return HandleError(kIoError); |
| 277 | } |
| 278 | |
Yurii Zubrytskyi | 5338b87 | 2019-06-17 14:26:30 -0700 | [diff] [blame] | 279 | if (fwrite(path.data(), 1, path.size(), file_) != path.size()) { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 280 | return HandleError(kIoError); |
| 281 | } |
| 282 | |
Yurii Zubrytskyi | bb0e58f | 2019-06-17 15:43:16 -0700 | [diff] [blame] | 283 | if (file_entry.padding_length != 0 && fwrite(zero_padding, 1, file_entry.padding_length, |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 284 | file_) != file_entry.padding_length) { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 285 | return HandleError(kIoError); |
| 286 | } |
| 287 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 288 | current_file_entry_ = std::move(file_entry); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 289 | current_offset_ = offset; |
| 290 | state_ = State::kWritingEntry; |
| 291 | return kNoError; |
| 292 | } |
| 293 | |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 294 | int32_t ZipWriter::DiscardLastEntry() { |
| 295 | if (state_ != State::kWritingZip || files_.empty()) { |
| 296 | return kInvalidState; |
| 297 | } |
| 298 | |
| 299 | FileEntry& last_entry = files_.back(); |
| 300 | current_offset_ = last_entry.local_file_header_offset; |
| 301 | if (fseeko(file_, current_offset_, SEEK_SET) != 0) { |
| 302 | return HandleError(kIoError); |
| 303 | } |
| 304 | files_.pop_back(); |
| 305 | return kNoError; |
| 306 | } |
| 307 | |
| 308 | int32_t ZipWriter::GetLastEntry(FileEntry* out_entry) { |
| 309 | CHECK(out_entry != nullptr); |
| 310 | |
| 311 | if (files_.empty()) { |
| 312 | return kInvalidState; |
| 313 | } |
| 314 | *out_entry = files_.back(); |
| 315 | return kNoError; |
| 316 | } |
| 317 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 318 | int32_t ZipWriter::PrepareDeflate() { |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 319 | CHECK(state_ == State::kWritingZip); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 320 | |
| 321 | // Initialize the z_stream for compression. |
Jiyong Park | 6821cc8 | 2017-06-30 17:23:33 +0900 | [diff] [blame] | 322 | z_stream_ = std::unique_ptr<z_stream, void (*)(z_stream*)>(new z_stream(), DeleteZStream); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 323 | |
Colin Cross | df22776 | 2016-09-16 10:15:51 -0700 | [diff] [blame] | 324 | #pragma GCC diagnostic push |
| 325 | #pragma GCC diagnostic ignored "-Wold-style-cast" |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 326 | int zerr = deflateInit2(z_stream_.get(), Z_BEST_COMPRESSION, Z_DEFLATED, -MAX_WBITS, |
| 327 | DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY); |
Colin Cross | df22776 | 2016-09-16 10:15:51 -0700 | [diff] [blame] | 328 | #pragma GCC diagnostic pop |
| 329 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 330 | if (zerr != Z_OK) { |
| 331 | if (zerr == Z_VERSION_ERROR) { |
Elliott Hughes | 51cbbaa | 2018-10-19 16:09:39 -0700 | [diff] [blame] | 332 | LOG(ERROR) << "Installed zlib is not compatible with linked version (" << ZLIB_VERSION << ")"; |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 333 | return HandleError(kZlibError); |
| 334 | } else { |
Elliott Hughes | 51cbbaa | 2018-10-19 16:09:39 -0700 | [diff] [blame] | 335 | LOG(ERROR) << "deflateInit2 failed (zerr=" << zerr << ")"; |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 336 | return HandleError(kZlibError); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | z_stream_->next_out = buffer_.data(); |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 341 | DCHECK_EQ(buffer_.size(), kBufSize); |
| 342 | z_stream_->avail_out = static_cast<uint32_t>(buffer_.size()); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 343 | return kNoError; |
| 344 | } |
| 345 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 346 | int32_t ZipWriter::WriteBytes(const void* data, size_t len) { |
| 347 | if (state_ != State::kWritingEntry) { |
| 348 | return HandleError(kInvalidState); |
| 349 | } |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 350 | // Need to be able to mark down data correctly. |
| 351 | if (len + static_cast<uint64_t>(current_file_entry_.uncompressed_size) > |
| 352 | std::numeric_limits<uint32_t>::max()) { |
| 353 | return HandleError(kIoError); |
| 354 | } |
| 355 | uint32_t len32 = static_cast<uint32_t>(len); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 356 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 357 | int32_t result = kNoError; |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 358 | if (current_file_entry_.compression_method & kCompressDeflated) { |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 359 | result = CompressBytes(¤t_file_entry_, data, len32); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 360 | } else { |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 361 | result = StoreBytes(¤t_file_entry_, data, len32); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 364 | if (result != kNoError) { |
| 365 | return result; |
| 366 | } |
| 367 | |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 368 | current_file_entry_.crc32 = static_cast<uint32_t>( |
| 369 | crc32(current_file_entry_.crc32, reinterpret_cast<const Bytef*>(data), len32)); |
| 370 | current_file_entry_.uncompressed_size += len32; |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 371 | return kNoError; |
| 372 | } |
| 373 | |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 374 | int32_t ZipWriter::StoreBytes(FileEntry* file, const void* data, uint32_t len) { |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 375 | CHECK(state_ == State::kWritingEntry); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 376 | |
| 377 | if (fwrite(data, 1, len, file_) != len) { |
| 378 | return HandleError(kIoError); |
| 379 | } |
| 380 | file->compressed_size += len; |
| 381 | current_offset_ += len; |
| 382 | return kNoError; |
| 383 | } |
| 384 | |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 385 | int32_t ZipWriter::CompressBytes(FileEntry* file, const void* data, uint32_t len) { |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 386 | CHECK(state_ == State::kWritingEntry); |
| 387 | CHECK(z_stream_); |
| 388 | CHECK(z_stream_->next_out != nullptr); |
| 389 | CHECK(z_stream_->avail_out != 0); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 390 | |
| 391 | // Prepare the input. |
| 392 | z_stream_->next_in = reinterpret_cast<const uint8_t*>(data); |
| 393 | z_stream_->avail_in = len; |
| 394 | |
| 395 | while (z_stream_->avail_in > 0) { |
| 396 | // We have more data to compress. |
| 397 | int zerr = deflate(z_stream_.get(), Z_NO_FLUSH); |
| 398 | if (zerr != Z_OK) { |
| 399 | return HandleError(kZlibError); |
| 400 | } |
| 401 | |
| 402 | if (z_stream_->avail_out == 0) { |
| 403 | // The output is full, let's write it to disk. |
Christopher Ferris | fcc081f | 2015-11-04 17:54:32 -0800 | [diff] [blame] | 404 | size_t write_bytes = z_stream_->next_out - buffer_.data(); |
| 405 | if (fwrite(buffer_.data(), 1, write_bytes, file_) != write_bytes) { |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 406 | return HandleError(kIoError); |
| 407 | } |
Christopher Ferris | fcc081f | 2015-11-04 17:54:32 -0800 | [diff] [blame] | 408 | file->compressed_size += write_bytes; |
| 409 | current_offset_ += write_bytes; |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 410 | |
| 411 | // Reset the output buffer for the next input. |
| 412 | z_stream_->next_out = buffer_.data(); |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 413 | DCHECK_EQ(buffer_.size(), kBufSize); |
| 414 | z_stream_->avail_out = static_cast<uint32_t>(buffer_.size()); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 415 | } |
| 416 | } |
| 417 | return kNoError; |
| 418 | } |
| 419 | |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 420 | int32_t ZipWriter::FlushCompressedBytes(FileEntry* file) { |
| 421 | CHECK(state_ == State::kWritingEntry); |
| 422 | CHECK(z_stream_); |
| 423 | CHECK(z_stream_->next_out != nullptr); |
| 424 | CHECK(z_stream_->avail_out != 0); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 425 | |
Christopher Ferris | fcc081f | 2015-11-04 17:54:32 -0800 | [diff] [blame] | 426 | // Keep deflating while there isn't enough space in the buffer to |
| 427 | // to complete the compress. |
| 428 | int zerr; |
| 429 | while ((zerr = deflate(z_stream_.get(), Z_FINISH)) == Z_OK) { |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 430 | CHECK(z_stream_->avail_out == 0); |
Christopher Ferris | fcc081f | 2015-11-04 17:54:32 -0800 | [diff] [blame] | 431 | size_t write_bytes = z_stream_->next_out - buffer_.data(); |
| 432 | if (fwrite(buffer_.data(), 1, write_bytes, file_) != write_bytes) { |
| 433 | return HandleError(kIoError); |
| 434 | } |
| 435 | file->compressed_size += write_bytes; |
| 436 | current_offset_ += write_bytes; |
| 437 | |
| 438 | z_stream_->next_out = buffer_.data(); |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 439 | DCHECK_EQ(buffer_.size(), kBufSize); |
| 440 | z_stream_->avail_out = static_cast<uint32_t>(buffer_.size()); |
Christopher Ferris | fcc081f | 2015-11-04 17:54:32 -0800 | [diff] [blame] | 441 | } |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 442 | if (zerr != Z_STREAM_END) { |
| 443 | return HandleError(kZlibError); |
| 444 | } |
| 445 | |
Christopher Ferris | fcc081f | 2015-11-04 17:54:32 -0800 | [diff] [blame] | 446 | size_t write_bytes = z_stream_->next_out - buffer_.data(); |
| 447 | if (write_bytes != 0) { |
| 448 | if (fwrite(buffer_.data(), 1, write_bytes, file_) != write_bytes) { |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 449 | return HandleError(kIoError); |
| 450 | } |
Christopher Ferris | fcc081f | 2015-11-04 17:54:32 -0800 | [diff] [blame] | 451 | file->compressed_size += write_bytes; |
| 452 | current_offset_ += write_bytes; |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 453 | } |
| 454 | z_stream_.reset(); |
| 455 | return kNoError; |
| 456 | } |
| 457 | |
Donald Chai | 322a60b | 2019-07-02 17:25:03 -0700 | [diff] [blame] | 458 | bool ZipWriter::ShouldUseDataDescriptor() const { |
| 459 | // Only use a trailing "data descriptor" if the output isn't seekable. |
| 460 | return !seekable_; |
| 461 | } |
| 462 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 463 | int32_t ZipWriter::FinishEntry() { |
| 464 | if (state_ != State::kWritingEntry) { |
| 465 | return kInvalidState; |
| 466 | } |
| 467 | |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 468 | if (current_file_entry_.compression_method & kCompressDeflated) { |
| 469 | int32_t result = FlushCompressedBytes(¤t_file_entry_); |
Adam Lesinski | c322b43 | 2015-10-06 15:23:46 -0700 | [diff] [blame] | 470 | if (result != kNoError) { |
| 471 | return result; |
| 472 | } |
| 473 | } |
| 474 | |
Donald Chai | 322a60b | 2019-07-02 17:25:03 -0700 | [diff] [blame] | 475 | if (ShouldUseDataDescriptor()) { |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 476 | // Some versions of ZIP don't allow STORED data to have a trailing DataDescriptor. |
| 477 | // If this file is not seekable, or if the data is compressed, write a DataDescriptor. |
Tianjie | cc92463 | 2020-03-26 12:34:44 -0700 | [diff] [blame] | 478 | // We haven't supported zip64 format yet. Write both uncompressed size and compressed |
| 479 | // size as uint32_t. |
| 480 | std::vector<uint32_t> dataDescriptor = { |
| 481 | DataDescriptor::kOptSignature, current_file_entry_.crc32, |
| 482 | current_file_entry_.compressed_size, current_file_entry_.uncompressed_size}; |
| 483 | if (fwrite(dataDescriptor.data(), dataDescriptor.size() * sizeof(uint32_t), 1, file_) != 1) { |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 484 | return HandleError(kIoError); |
| 485 | } |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 486 | |
Tianjie | cc92463 | 2020-03-26 12:34:44 -0700 | [diff] [blame] | 487 | current_offset_ += sizeof(uint32_t) * dataDescriptor.size(); |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 488 | } else { |
| 489 | // Seek back to the header and rewrite to include the size. |
| 490 | if (fseeko(file_, current_file_entry_.local_file_header_offset, SEEK_SET) != 0) { |
| 491 | return HandleError(kIoError); |
| 492 | } |
| 493 | |
| 494 | LocalFileHeader header = {}; |
| 495 | CopyFromFileEntry(current_file_entry_, false /*use_data_descriptor*/, &header); |
| 496 | |
| 497 | if (fwrite(&header, sizeof(header), 1, file_) != 1) { |
| 498 | return HandleError(kIoError); |
| 499 | } |
| 500 | |
| 501 | if (fseeko(file_, current_offset_, SEEK_SET) != 0) { |
| 502 | return HandleError(kIoError); |
| 503 | } |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 504 | } |
| 505 | |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 506 | files_.emplace_back(std::move(current_file_entry_)); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 507 | state_ = State::kWritingZip; |
| 508 | return kNoError; |
| 509 | } |
| 510 | |
| 511 | int32_t ZipWriter::Finish() { |
| 512 | if (state_ != State::kWritingZip) { |
| 513 | return kInvalidState; |
| 514 | } |
| 515 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 516 | off_t startOfCdr = current_offset_; |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 517 | for (FileEntry& file : files_) { |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 518 | CentralDirectoryRecord cdr = {}; |
| 519 | cdr.record_signature = CentralDirectoryRecord::kSignature; |
Donald Chai | 322a60b | 2019-07-02 17:25:03 -0700 | [diff] [blame] | 520 | if (ShouldUseDataDescriptor()) { |
Adam Lesinski | 253cc06 | 2017-04-06 18:55:47 -0700 | [diff] [blame] | 521 | cdr.gpb_flags |= kGPBDDFlagMask; |
| 522 | } |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 523 | cdr.compression_method = file.compression_method; |
| 524 | cdr.last_mod_time = file.last_mod_time; |
| 525 | cdr.last_mod_date = file.last_mod_date; |
| 526 | cdr.crc32 = file.crc32; |
| 527 | cdr.compressed_size = file.compressed_size; |
| 528 | cdr.uncompressed_size = file.uncompressed_size; |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 529 | // Checked in IsValidEntryName. |
| 530 | DCHECK_LE(file.path.size(), std::numeric_limits<uint16_t>::max()); |
| 531 | cdr.file_name_length = static_cast<uint16_t>(file.path.size()); |
| 532 | // Checked in StartAlignedEntryWithTime. |
| 533 | DCHECK_LE(file.local_file_header_offset, std::numeric_limits<uint32_t>::max()); |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 534 | cdr.local_file_header_offset = static_cast<uint32_t>(file.local_file_header_offset); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 535 | if (fwrite(&cdr, sizeof(cdr), 1, file_) != 1) { |
| 536 | return HandleError(kIoError); |
| 537 | } |
| 538 | |
| 539 | if (fwrite(file.path.data(), 1, file.path.size(), file_) != file.path.size()) { |
| 540 | return HandleError(kIoError); |
| 541 | } |
| 542 | |
| 543 | current_offset_ += sizeof(cdr) + file.path.size(); |
| 544 | } |
| 545 | |
| 546 | EocdRecord er = {}; |
| 547 | er.eocd_signature = EocdRecord::kSignature; |
Adam Lesinski | a8d71d6 | 2015-10-20 12:41:49 -0700 | [diff] [blame] | 548 | er.disk_num = 0; |
| 549 | er.cd_start_disk = 0; |
Andreas Gampe | 5a5ffb5 | 2019-04-05 13:48:02 -0700 | [diff] [blame] | 550 | // Checked when adding entries. |
| 551 | DCHECK_LE(files_.size(), std::numeric_limits<uint16_t>::max()); |
| 552 | er.num_records_on_disk = static_cast<uint16_t>(files_.size()); |
| 553 | er.num_records = static_cast<uint16_t>(files_.size()); |
| 554 | if (current_offset_ > std::numeric_limits<uint32_t>::max()) { |
| 555 | return HandleError(kIoError); |
| 556 | } |
| 557 | er.cd_size = static_cast<uint32_t>(current_offset_ - startOfCdr); |
| 558 | er.cd_start_offset = static_cast<uint32_t>(startOfCdr); |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 559 | |
| 560 | if (fwrite(&er, sizeof(er), 1, file_) != 1) { |
| 561 | return HandleError(kIoError); |
| 562 | } |
| 563 | |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 564 | current_offset_ += sizeof(er); |
| 565 | |
| 566 | // Since we can BackUp() and potentially finish writing at an offset less than one we had |
| 567 | // already written at, we must truncate the file. |
| 568 | |
Adam Lesinski | f61aaf4 | 2017-03-29 16:10:11 -0700 | [diff] [blame] | 569 | if (ftruncate(fileno(file_), current_offset_) != 0) { |
Adam Lesinski | 2e216de | 2017-03-16 13:23:51 -0700 | [diff] [blame] | 570 | return HandleError(kIoError); |
| 571 | } |
| 572 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 573 | if (fflush(file_) != 0) { |
| 574 | return HandleError(kIoError); |
| 575 | } |
| 576 | |
Adam Lesinski | 622f304 | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 577 | state_ = State::kDone; |
| 578 | return kNoError; |
| 579 | } |