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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "components/zip/zip_reader.h" | |
| 6 | |
| 7 #include "base/file_util.h" | |
| 8 #include "base/logging.h" | |
| 9 #include "base/string_util.h" | |
| 10 #include "base/utf_string_conversions.h" | |
| 11 #include "components/zip/zip_internal.h" | |
| 12 #include "net/base/file_stream.h" | |
| 13 | |
| 14 #if defined(USE_SYSTEM_MINIZIP) | |
| 15 #include <minizip/unzip.h> | |
| 16 #else | |
| 17 #include "third_party/zlib/contrib/minizip/unzip.h" | |
| 18 #if defined(OS_WIN) | |
| 19 #include "third_party/zlib/contrib/minizip/iowin32.h" | |
| 20 #endif // defined(OS_WIN) | |
| 21 #endif // defined(USE_SYSTEM_MINIZIP) | |
| 22 | |
| 23 namespace zip { | |
| 24 | |
| 25 // TODO(satorux): The implementation assumes that file names in zip files | |
| 26 // are encoded in UTF-8. This is true for zip files created by Zip() | |
| 27 // function in zip.h, but not true for user-supplied random zip files. | |
| 28 ZipReader::EntryInfo::EntryInfo(const std::string& file_name_in_zip, | |
| 29 const unz_file_info& raw_file_info) | |
| 30 : file_path_(base::FilePath::FromUTF8Unsafe(file_name_in_zip)), | |
| 31 is_directory_(false) { | |
| 32 original_size_ = raw_file_info.uncompressed_size; | |
| 33 | |
| 34 // Directory entries in zip files end with "/". | |
| 35 is_directory_ = EndsWith(file_name_in_zip, "/", false); | |
| 36 | |
| 37 // Check the file name here for directory traversal issues. In the name of | |
| 38 // simplicity and security, we might reject a valid file name such as "a..b". | |
| 39 is_unsafe_ = file_name_in_zip.find("..") != std::string::npos; | |
| 40 | |
| 41 // We also consider that the file name is unsafe, if it's invalid UTF-8. | |
| 42 string16 file_name_utf16; | |
| 43 if (!UTF8ToUTF16(file_name_in_zip.data(), file_name_in_zip.size(), | |
| 44 &file_name_utf16)) { | |
| 45 is_unsafe_ = true; | |
| 46 } | |
| 47 | |
| 48 // We also consider that the file name is unsafe, if it's absolute. | |
| 49 // On Windows, IsAbsolute() returns false for paths starting with "/". | |
| 50 if (file_path_.IsAbsolute() || StartsWithASCII(file_name_in_zip, "/", false)) | |
| 51 is_unsafe_ = true; | |
| 52 | |
| 53 // Construct the last modified time. The timezone info is not present in | |
| 54 // zip files, so we construct the time as local time. | |
| 55 base::Time::Exploded exploded_time = {}; // Zero-clear. | |
| 56 exploded_time.year = raw_file_info.tmu_date.tm_year; | |
| 57 // The month in zip file is 0-based, whereas ours is 1-based. | |
| 58 exploded_time.month = raw_file_info.tmu_date.tm_mon + 1; | |
| 59 exploded_time.day_of_month = raw_file_info.tmu_date.tm_mday; | |
| 60 exploded_time.hour = raw_file_info.tmu_date.tm_hour; | |
| 61 exploded_time.minute = raw_file_info.tmu_date.tm_min; | |
| 62 exploded_time.second = raw_file_info.tmu_date.tm_sec; | |
| 63 exploded_time.millisecond = 0; | |
| 64 if (exploded_time.HasValidValues()) { | |
| 65 last_modified_ = base::Time::FromLocalExploded(exploded_time); | |
| 66 } else { | |
| 67 // Use Unix time epoch if the time stamp data is invalid. | |
| 68 last_modified_ = base::Time::UnixEpoch(); | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 ZipReader::ZipReader() { | |
| 73 Reset(); | |
| 74 } | |
| 75 | |
| 76 ZipReader::~ZipReader() { | |
| 77 Close(); | |
| 78 } | |
| 79 | |
| 80 bool ZipReader::Open(const base::FilePath& zip_file_path) { | |
| 81 DCHECK(!zip_file_); | |
| 82 | |
| 83 // Use of "Unsafe" function does not look good, but there is no way to do | |
| 84 // this safely on Linux. See file_util.h for details. | |
| 85 zip_file_ = internal::OpenForUnzipping(zip_file_path.AsUTF8Unsafe()); | |
| 86 if (!zip_file_) { | |
| 87 return false; | |
| 88 } | |
| 89 | |
| 90 return OpenInternal(); | |
| 91 } | |
| 92 | |
| 93 bool ZipReader::OpenFromPlatformFile(base::PlatformFile zip_fd) { | |
| 94 DCHECK(!zip_file_); | |
| 95 | |
| 96 #if defined(OS_POSIX) | |
| 97 zip_file_ = internal::OpenFdForUnzipping(zip_fd); | |
| 98 #elif defined(OS_WIN) | |
| 99 zip_file_ = internal::OpenHandleForUnzipping(zip_fd); | |
| 100 #endif | |
| 101 if (!zip_file_) { | |
| 102 return false; | |
| 103 } | |
| 104 | |
| 105 return OpenInternal(); | |
| 106 } | |
| 107 | |
| 108 bool ZipReader::OpenFromString(const std::string& data) { | |
| 109 zip_file_ = internal::PreprareMemoryForUnzipping(data); | |
| 110 if (!zip_file_) | |
| 111 return false; | |
| 112 return OpenInternal(); | |
| 113 } | |
| 114 | |
| 115 void ZipReader::Close() { | |
| 116 if (zip_file_) { | |
| 117 unzClose(zip_file_); | |
| 118 } | |
| 119 Reset(); | |
| 120 } | |
| 121 | |
| 122 bool ZipReader::HasMore() { | |
| 123 return !reached_end_; | |
| 124 } | |
| 125 | |
| 126 bool ZipReader::AdvanceToNextEntry() { | |
| 127 DCHECK(zip_file_); | |
| 128 | |
| 129 // Should not go further if we already reached the end. | |
| 130 if (reached_end_) | |
| 131 return false; | |
| 132 | |
| 133 unz_file_pos position = {}; | |
| 134 if (unzGetFilePos(zip_file_, &position) != UNZ_OK) | |
| 135 return false; | |
| 136 const int current_entry_index = position.num_of_file; | |
| 137 // If we are currently at the last entry, then the next position is the | |
| 138 // end of the zip file, so mark that we reached the end. | |
| 139 if (current_entry_index + 1 == num_entries_) { | |
| 140 reached_end_ = true; | |
| 141 } else { | |
| 142 DCHECK_LT(current_entry_index + 1, num_entries_); | |
| 143 if (unzGoToNextFile(zip_file_) != UNZ_OK) { | |
| 144 return false; | |
| 145 } | |
| 146 } | |
| 147 current_entry_info_.reset(); | |
| 148 return true; | |
| 149 } | |
| 150 | |
| 151 bool ZipReader::OpenCurrentEntryInZip() { | |
| 152 DCHECK(zip_file_); | |
| 153 | |
| 154 unz_file_info raw_file_info = {}; | |
| 155 char raw_file_name_in_zip[internal::kZipMaxPath] = {}; | |
| 156 const int result = unzGetCurrentFileInfo(zip_file_, | |
| 157 &raw_file_info, | |
| 158 raw_file_name_in_zip, | |
| 159 sizeof(raw_file_name_in_zip) - 1, | |
| 160 NULL, // extraField. | |
| 161 0, // extraFieldBufferSize. | |
| 162 NULL, // szComment. | |
| 163 0); // commentBufferSize. | |
| 164 if (result != UNZ_OK) | |
| 165 return false; | |
| 166 if (raw_file_name_in_zip[0] == '\0') | |
| 167 return false; | |
| 168 current_entry_info_.reset( | |
| 169 new EntryInfo(raw_file_name_in_zip, raw_file_info)); | |
| 170 return true; | |
| 171 } | |
| 172 | |
| 173 bool ZipReader::LocateAndOpenEntry(const base::FilePath& path_in_zip) { | |
| 174 DCHECK(zip_file_); | |
| 175 | |
| 176 current_entry_info_.reset(); | |
| 177 reached_end_ = false; | |
| 178 const int kDefaultCaseSensivityOfOS = 0; | |
| 179 const int result = unzLocateFile(zip_file_, | |
| 180 path_in_zip.AsUTF8Unsafe().c_str(), | |
| 181 kDefaultCaseSensivityOfOS); | |
| 182 if (result != UNZ_OK) | |
| 183 return false; | |
| 184 | |
| 185 // Then Open the entry. | |
| 186 return OpenCurrentEntryInZip(); | |
| 187 } | |
| 188 | |
| 189 bool ZipReader::ExtractCurrentEntryToFilePath( | |
| 190 const base::FilePath& output_file_path) { | |
| 191 DCHECK(zip_file_); | |
| 192 | |
| 193 // If this is a directory, just create it and return. | |
| 194 if (current_entry_info()->is_directory()) | |
| 195 return file_util::CreateDirectory(output_file_path); | |
| 196 | |
| 197 const int open_result = unzOpenCurrentFile(zip_file_); | |
| 198 if (open_result != UNZ_OK) | |
| 199 return false; | |
| 200 | |
| 201 // We can't rely on parent directory entries being specified in the | |
| 202 // zip, so we make sure they are created. | |
| 203 base::FilePath output_dir_path = output_file_path.DirName(); | |
| 204 if (!file_util::CreateDirectory(output_dir_path)) | |
| 205 return false; | |
| 206 | |
| 207 net::FileStream stream(NULL); | |
| 208 const int flags = (base::PLATFORM_FILE_CREATE_ALWAYS | | |
| 209 base::PLATFORM_FILE_WRITE); | |
| 210 if (stream.OpenSync(output_file_path, flags) != 0) | |
| 211 return false; | |
| 212 | |
| 213 bool success = true; // This becomes false when something bad happens. | |
| 214 while (true) { | |
| 215 char buf[internal::kZipBufSize]; | |
| 216 const int num_bytes_read = unzReadCurrentFile(zip_file_, buf, | |
| 217 internal::kZipBufSize); | |
| 218 if (num_bytes_read == 0) { | |
| 219 // Reached the end of the file. | |
| 220 break; | |
| 221 } else if (num_bytes_read < 0) { | |
| 222 // If num_bytes_read < 0, then it's a specific UNZ_* error code. | |
| 223 success = false; | |
| 224 break; | |
| 225 } else if (num_bytes_read > 0) { | |
| 226 // Some data is read. Write it to the output file. | |
| 227 if (num_bytes_read != stream.WriteSync(buf, num_bytes_read)) { | |
| 228 success = false; | |
| 229 break; | |
| 230 } | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 unzCloseCurrentFile(zip_file_); | |
| 235 return success; | |
| 236 } | |
| 237 | |
| 238 bool ZipReader::ExtractCurrentEntryIntoDirectory( | |
| 239 const base::FilePath& output_directory_path) { | |
| 240 DCHECK(current_entry_info_.get()); | |
| 241 | |
| 242 base::FilePath output_file_path = output_directory_path.Append( | |
| 243 current_entry_info()->file_path()); | |
| 244 return ExtractCurrentEntryToFilePath(output_file_path); | |
| 245 } | |
| 246 | |
| 247 #if defined(OS_POSIX) | |
| 248 bool ZipReader::ExtractCurrentEntryToFd(const int fd) { | |
| 249 DCHECK(zip_file_); | |
| 250 | |
| 251 // If this is a directory, there's nothing to extract to the file descriptor, | |
| 252 // so return false. | |
| 253 if (current_entry_info()->is_directory()) | |
| 254 return false; | |
| 255 | |
| 256 const int open_result = unzOpenCurrentFile(zip_file_); | |
| 257 if (open_result != UNZ_OK) | |
| 258 return false; | |
| 259 | |
| 260 bool success = true; // This becomes false when something bad happens. | |
| 261 while (true) { | |
| 262 char buf[internal::kZipBufSize]; | |
| 263 const int num_bytes_read = unzReadCurrentFile(zip_file_, buf, | |
| 264 internal::kZipBufSize); | |
| 265 if (num_bytes_read == 0) { | |
| 266 // Reached the end of the file. | |
| 267 break; | |
| 268 } else if (num_bytes_read < 0) { | |
| 269 // If num_bytes_read < 0, then it's a specific UNZ_* error code. | |
| 270 success = false; | |
| 271 break; | |
| 272 } else if (num_bytes_read > 0) { | |
| 273 // Some data is read. Write it to the output file descriptor. | |
| 274 if (num_bytes_read != | |
| 275 file_util::WriteFileDescriptor(fd, buf, num_bytes_read)) { | |
| 276 success = false; | |
| 277 break; | |
| 278 } | |
| 279 } | |
| 280 } | |
| 281 | |
| 282 unzCloseCurrentFile(zip_file_); | |
| 283 return success; | |
| 284 } | |
| 285 #endif // defined(OS_POSIX) | |
| 286 | |
| 287 bool ZipReader::OpenInternal() { | |
| 288 DCHECK(zip_file_); | |
| 289 | |
| 290 unz_global_info zip_info = {}; // Zero-clear. | |
| 291 if (unzGetGlobalInfo(zip_file_, &zip_info) != UNZ_OK) { | |
| 292 return false; | |
| 293 } | |
| 294 num_entries_ = zip_info.number_entry; | |
| 295 if (num_entries_ < 0) | |
| 296 return false; | |
| 297 | |
| 298 // We are already at the end if the zip file is empty. | |
| 299 reached_end_ = (num_entries_ == 0); | |
| 300 return true; | |
| 301 } | |
| 302 | |
| 303 void ZipReader::Reset() { | |
| 304 zip_file_ = NULL; | |
| 305 num_entries_ = 0; | |
| 306 reached_end_ = false; | |
| 307 current_entry_info_.reset(); | |
| 308 } | |
| 309 | |
| 310 } // namespace zip | |
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Chromium Code Reviews
Issue 14021015:
Move components/zip to third_party/zip (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src