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| 1 // Copyright (c) 2011 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 "chrome/common/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 "chrome/common/zip_internal.h" |
| 12 #include "net/base/file_stream.h" |
| 13 #include "third_party/zlib/contrib/minizip/unzip.h" |
| 14 #if defined(OS_WIN) |
| 15 #include "third_party/zlib/contrib/minizip/iowin32.h" |
| 16 #endif |
| 17 |
| 18 namespace zip { |
| 19 |
| 20 // TODO(satorux): The implementation assumes that file names in zip files |
| 21 // are encoded in UTF-8. This is true for zip files created by Zip() |
| 22 // function in zip.h, but not true for user-supplied random zip files. |
| 23 ZipReader::EntryInfo::EntryInfo(const std::string& file_name_in_zip, |
| 24 const unz_file_info& raw_file_info) |
| 25 : file_path_(FilePath::FromUTF8Unsafe(file_name_in_zip)), |
| 26 is_directory_(false) { |
| 27 original_size_ = raw_file_info.uncompressed_size; |
| 28 |
| 29 // Directory entries in zip files end with "/". |
| 30 is_directory_ = EndsWith(file_name_in_zip, "/", false); |
| 31 |
| 32 // Check the file name here for directory traversal issues. In the name of |
| 33 // simplicity and security, we might reject a valid file name such as "a..b". |
| 34 is_unsafe_ = file_name_in_zip.find("..") != std::string::npos; |
| 35 |
| 36 // We also consider that the file name is unsafe, if it's invalid UTF-8. |
| 37 string16 file_name_utf16; |
| 38 if (!UTF8ToUTF16(file_name_in_zip.data(), file_name_in_zip.size(), |
| 39 &file_name_utf16)) { |
| 40 is_unsafe_ = true; |
| 41 } |
| 42 |
| 43 // We also consider that the file name is unsafe, if it's absolute. |
| 44 // On Windows, IsAbsolute() returns false for paths starting with "/". |
| 45 if (file_path_.IsAbsolute() || StartsWithASCII(file_name_in_zip, "/", false)) |
| 46 is_unsafe_ = true; |
| 47 |
| 48 // Construct the last modified time. The timezone info is not present in |
| 49 // zip files, so we construct the time as local time. |
| 50 base::Time::Exploded exploded_time = {}; // Zero-clear. |
| 51 exploded_time.year = raw_file_info.tmu_date.tm_year; |
| 52 // The month in zip file is 0-based, whereas ours is 1-based. |
| 53 exploded_time.month = raw_file_info.tmu_date.tm_mon + 1; |
| 54 exploded_time.day_of_month = raw_file_info.tmu_date.tm_mday; |
| 55 exploded_time.hour = raw_file_info.tmu_date.tm_hour; |
| 56 exploded_time.minute = raw_file_info.tmu_date.tm_min; |
| 57 exploded_time.second = raw_file_info.tmu_date.tm_sec; |
| 58 exploded_time.millisecond = 0; |
| 59 if (exploded_time.HasValidValues()) { |
| 60 last_modified_ = base::Time::FromLocalExploded(exploded_time); |
| 61 } else { |
| 62 // Use Unix time epoch if the time stamp data is invalid. |
| 63 last_modified_ = base::Time::UnixEpoch(); |
| 64 } |
| 65 } |
| 66 |
| 67 ZipReader::ZipReader() { |
| 68 Reset(); |
| 69 } |
| 70 |
| 71 ZipReader::~ZipReader() { |
| 72 Close(); |
| 73 } |
| 74 |
| 75 bool ZipReader::Open(const FilePath& zip_file_path) { |
| 76 DCHECK(!zip_file_); |
| 77 |
| 78 // Use of "Unsafe" function does not look good, but there is no way to do |
| 79 // this safely on Linux. See file_util.h for details. |
| 80 zip_file_ = internal::OpenForUnzipping(zip_file_path.AsUTF8Unsafe()); |
| 81 if (!zip_file_) { |
| 82 return false; |
| 83 } |
| 84 |
| 85 unz_global_info zip_info = {}; // Zero-clear. |
| 86 if (unzGetGlobalInfo(zip_file_, &zip_info) != UNZ_OK) { |
| 87 return false; |
| 88 } |
| 89 num_entries_ = zip_info.number_entry; |
| 90 if (num_entries_ < 0) |
| 91 return false; |
| 92 |
| 93 // We are already at the end if the zip file is empty. |
| 94 reached_end_ = (num_entries_ == 0); |
| 95 return true; |
| 96 } |
| 97 |
| 98 void ZipReader::Close() { |
| 99 if (zip_file_) { |
| 100 unzClose(zip_file_); |
| 101 } |
| 102 Reset(); |
| 103 } |
| 104 |
| 105 bool ZipReader::HasMore() { |
| 106 return !reached_end_; |
| 107 } |
| 108 |
| 109 bool ZipReader::AdvanceToNextEntry() { |
| 110 DCHECK(zip_file_); |
| 111 |
| 112 // Should not go further if we already reached the end. |
| 113 if (reached_end_) |
| 114 return false; |
| 115 |
| 116 unz_file_pos position = {}; |
| 117 if (unzGetFilePos(zip_file_, &position) != UNZ_OK) |
| 118 return false; |
| 119 const int current_entry_index = position.num_of_file; |
| 120 // If we are currently at the last entry, then the next position is the |
| 121 // end of the zip file, so mark that we reached the end. |
| 122 if (current_entry_index + 1 == num_entries_) { |
| 123 reached_end_ = true; |
| 124 } else { |
| 125 DCHECK_LT(current_entry_index + 1, num_entries_); |
| 126 if (unzGoToNextFile(zip_file_) != UNZ_OK) { |
| 127 return false; |
| 128 } |
| 129 } |
| 130 current_entry_info_.reset(); |
| 131 return true; |
| 132 } |
| 133 |
| 134 bool ZipReader::OpenCurrentEntryInZip() { |
| 135 DCHECK(zip_file_); |
| 136 |
| 137 unz_file_info raw_file_info = {}; |
| 138 char raw_file_name_in_zip[internal::kZipMaxPath] = {}; |
| 139 const int result = unzGetCurrentFileInfo(zip_file_, |
| 140 &raw_file_info, |
| 141 raw_file_name_in_zip, |
| 142 sizeof(raw_file_name_in_zip) - 1, |
| 143 NULL, // extraField. |
| 144 0, // extraFieldBufferSize. |
| 145 NULL, // szComment. |
| 146 0); // commentBufferSize. |
| 147 if (result != UNZ_OK) |
| 148 return NULL; |
| 149 if (raw_file_name_in_zip[0] == '\0') |
| 150 return NULL; |
| 151 current_entry_info_.reset( |
| 152 new EntryInfo(raw_file_name_in_zip, raw_file_info)); |
| 153 return true; |
| 154 } |
| 155 |
| 156 bool ZipReader::LocateAndOpenEntry(const FilePath& path_in_zip) { |
| 157 DCHECK(zip_file_); |
| 158 |
| 159 current_entry_info_.reset(); |
| 160 reached_end_ = false; |
| 161 const int kDefaultCaseSensivityOfOS = 0; |
| 162 const int result = unzLocateFile(zip_file_, |
| 163 path_in_zip.AsUTF8Unsafe().c_str(), |
| 164 kDefaultCaseSensivityOfOS); |
| 165 if (result != UNZ_OK) |
| 166 return false; |
| 167 |
| 168 // Then Open the entry. |
| 169 return OpenCurrentEntryInZip(); |
| 170 } |
| 171 |
| 172 bool ZipReader::ExtractCurrentEntryToFilePath( |
| 173 const FilePath& output_file_path) { |
| 174 DCHECK(zip_file_); |
| 175 |
| 176 // If this is a directory, just create it and return. |
| 177 if (current_entry_info()->is_directory()) |
| 178 return file_util::CreateDirectory(output_file_path); |
| 179 |
| 180 const int open_result = unzOpenCurrentFile(zip_file_); |
| 181 if (open_result != UNZ_OK) |
| 182 return false; |
| 183 |
| 184 // We can't rely on parent directory entries being specified in the |
| 185 // zip, so we make sure they are created. |
| 186 FilePath output_dir_path = output_file_path.DirName(); |
| 187 if (!file_util::CreateDirectory(output_dir_path)) |
| 188 return false; |
| 189 |
| 190 net::FileStream stream; |
| 191 const int flags = (base::PLATFORM_FILE_CREATE_ALWAYS | |
| 192 base::PLATFORM_FILE_WRITE); |
| 193 if (stream.Open(output_file_path, flags) != 0) |
| 194 return false; |
| 195 |
| 196 bool success = true; // This becomes false when something bad happens. |
| 197 while (true) { |
| 198 char buf[internal::kZipBufSize]; |
| 199 const int num_bytes_read = unzReadCurrentFile(zip_file_, buf, |
| 200 internal::kZipBufSize); |
| 201 if (num_bytes_read == 0) { |
| 202 // Reached the end of the file. |
| 203 break; |
| 204 } else if (num_bytes_read < 0) { |
| 205 // If num_bytes_read < 0, then it's a specific UNZ_* error code. |
| 206 success = false; |
| 207 break; |
| 208 } else if (num_bytes_read > 0) { |
| 209 // Some data is read. Write it to the output file. |
| 210 if (num_bytes_read != stream.Write(buf, num_bytes_read, |
| 211 net::CompletionCallback())) { |
| 212 success = false; |
| 213 break; |
| 214 } |
| 215 } |
| 216 } |
| 217 |
| 218 stream.Close(); |
| 219 unzCloseCurrentFile(zip_file_); |
| 220 return success; |
| 221 } |
| 222 |
| 223 bool ZipReader::ExtractCurrentEntryIntoDirectory( |
| 224 const FilePath& output_directory_path) { |
| 225 DCHECK(current_entry_info_.get()); |
| 226 |
| 227 FilePath output_file_path = output_directory_path.Append( |
| 228 current_entry_info()->file_path()); |
| 229 return ExtractCurrentEntryToFilePath(output_file_path); |
| 230 } |
| 231 |
| 232 void ZipReader::Reset() { |
| 233 zip_file_ = NULL; |
| 234 num_entries_ = 0; |
| 235 reached_end_ = false; |
| 236 current_entry_info_.reset(); |
| 237 } |
| 238 |
| 239 } // namespace zip |
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