The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 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 | |
| 17 | // |
| 18 | // Read-only access to Zip archives, with minimal heap allocation. |
| 19 | // |
| 20 | #define LOG_TAG "zipro" |
| 21 | //#define LOG_NDEBUG 0 |
Mathias Agopian | f446ba9 | 2009-06-04 13:53:57 -0700 | [diff] [blame] | 22 | #include <utils/ZipFileRO.h> |
| 23 | #include <utils/Log.h> |
| 24 | #include <utils/misc.h> |
Kenny Root | fa98920 | 2010-09-24 07:57:37 -0700 | [diff] [blame] | 25 | #include <utils/threads.h> |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 26 | |
| 27 | #include <zlib.h> |
| 28 | |
| 29 | #include <string.h> |
| 30 | #include <fcntl.h> |
| 31 | #include <errno.h> |
| 32 | #include <assert.h> |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 33 | #include <unistd.h> |
| 34 | |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 35 | #if HAVE_PRINTF_ZD |
| 36 | # define ZD "%zd" |
| 37 | # define ZD_TYPE ssize_t |
| 38 | #else |
| 39 | # define ZD "%ld" |
| 40 | # define ZD_TYPE long |
| 41 | #endif |
| 42 | |
| 43 | /* |
| 44 | * We must open binary files using open(path, ... | O_BINARY) under Windows. |
| 45 | * Otherwise strange read errors will happen. |
| 46 | */ |
| 47 | #ifndef O_BINARY |
| 48 | # define O_BINARY 0 |
| 49 | #endif |
| 50 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 51 | /* |
| 52 | * TEMP_FAILURE_RETRY is defined by some, but not all, versions of |
| 53 | * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's |
| 54 | * not already defined, then define it here. |
| 55 | */ |
| 56 | #ifndef TEMP_FAILURE_RETRY |
| 57 | /* Used to retry syscalls that can return EINTR. */ |
| 58 | #define TEMP_FAILURE_RETRY(exp) ({ \ |
| 59 | typeof (exp) _rc; \ |
| 60 | do { \ |
| 61 | _rc = (exp); \ |
| 62 | } while (_rc == -1 && errno == EINTR); \ |
| 63 | _rc; }) |
| 64 | #endif |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 65 | |
| 66 | using namespace android; |
| 67 | |
| 68 | /* |
| 69 | * Zip file constants. |
| 70 | */ |
| 71 | #define kEOCDSignature 0x06054b50 |
| 72 | #define kEOCDLen 22 |
| 73 | #define kEOCDNumEntries 8 // offset to #of entries in file |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 74 | #define kEOCDSize 12 // size of the central directory |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 75 | #define kEOCDFileOffset 16 // offset to central directory |
| 76 | |
| 77 | #define kMaxCommentLen 65535 // longest possible in ushort |
| 78 | #define kMaxEOCDSearch (kMaxCommentLen + kEOCDLen) |
| 79 | |
| 80 | #define kLFHSignature 0x04034b50 |
| 81 | #define kLFHLen 30 // excluding variable-len fields |
| 82 | #define kLFHNameLen 26 // offset to filename length |
| 83 | #define kLFHExtraLen 28 // offset to extra length |
| 84 | |
| 85 | #define kCDESignature 0x02014b50 |
| 86 | #define kCDELen 46 // excluding variable-len fields |
| 87 | #define kCDEMethod 10 // offset to compression method |
| 88 | #define kCDEModWhen 12 // offset to modification timestamp |
| 89 | #define kCDECRC 16 // offset to entry CRC |
| 90 | #define kCDECompLen 20 // offset to compressed length |
| 91 | #define kCDEUncompLen 24 // offset to uncompressed length |
| 92 | #define kCDENameLen 28 // offset to filename length |
| 93 | #define kCDEExtraLen 30 // offset to extra length |
| 94 | #define kCDECommentLen 32 // offset to comment length |
| 95 | #define kCDELocalOffset 42 // offset to local hdr |
| 96 | |
| 97 | /* |
| 98 | * The values we return for ZipEntryRO use 0 as an invalid value, so we |
| 99 | * want to adjust the hash table index by a fixed amount. Using a large |
| 100 | * value helps insure that people don't mix & match arguments, e.g. to |
| 101 | * findEntryByIndex(). |
| 102 | */ |
| 103 | #define kZipEntryAdj 10000 |
| 104 | |
Kenny Root | dbf6f27 | 2010-10-01 18:28:28 -0700 | [diff] [blame] | 105 | ZipFileRO::~ZipFileRO() { |
| 106 | free(mHashTable); |
| 107 | if (mDirectoryMap) |
| 108 | mDirectoryMap->release(); |
| 109 | if (mFd >= 0) |
| 110 | TEMP_FAILURE_RETRY(close(mFd)); |
| 111 | if (mFileName) |
| 112 | free(mFileName); |
| 113 | } |
| 114 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 115 | /* |
| 116 | * Convert a ZipEntryRO to a hash table index, verifying that it's in a |
| 117 | * valid range. |
| 118 | */ |
| 119 | int ZipFileRO::entryToIndex(const ZipEntryRO entry) const |
| 120 | { |
| 121 | long ent = ((long) entry) - kZipEntryAdj; |
| 122 | if (ent < 0 || ent >= mHashTableSize || mHashTable[ent].name == NULL) { |
| 123 | LOGW("Invalid ZipEntryRO %p (%ld)\n", entry, ent); |
| 124 | return -1; |
| 125 | } |
| 126 | return ent; |
| 127 | } |
| 128 | |
| 129 | |
| 130 | /* |
| 131 | * Open the specified file read-only. We memory-map the entire thing and |
| 132 | * close the file before returning. |
| 133 | */ |
| 134 | status_t ZipFileRO::open(const char* zipFileName) |
| 135 | { |
| 136 | int fd = -1; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 137 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 138 | assert(mDirectoryMap == NULL); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 139 | |
| 140 | /* |
| 141 | * Open and map the specified file. |
| 142 | */ |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 143 | fd = ::open(zipFileName, O_RDONLY | O_BINARY); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 144 | if (fd < 0) { |
| 145 | LOGW("Unable to open zip '%s': %s\n", zipFileName, strerror(errno)); |
| 146 | return NAME_NOT_FOUND; |
| 147 | } |
| 148 | |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 149 | mFileLength = lseek64(fd, 0, SEEK_END); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 150 | if (mFileLength < kEOCDLen) { |
Kenny Root | dbf6f27 | 2010-10-01 18:28:28 -0700 | [diff] [blame] | 151 | TEMP_FAILURE_RETRY(close(fd)); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 152 | return UNKNOWN_ERROR; |
| 153 | } |
| 154 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 155 | if (mFileName != NULL) { |
| 156 | free(mFileName); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 157 | } |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 158 | mFileName = strdup(zipFileName); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 159 | |
| 160 | mFd = fd; |
| 161 | |
| 162 | /* |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 163 | * Find the Central Directory and store its size and number of entries. |
| 164 | */ |
| 165 | if (!mapCentralDirectory()) { |
| 166 | goto bail; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Verify Central Directory and create data structures for fast access. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 171 | */ |
| 172 | if (!parseZipArchive()) { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 173 | goto bail; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | return OK; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 177 | |
| 178 | bail: |
| 179 | free(mFileName); |
| 180 | mFileName = NULL; |
Kenny Root | dbf6f27 | 2010-10-01 18:28:28 -0700 | [diff] [blame] | 181 | TEMP_FAILURE_RETRY(close(fd)); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 182 | return UNKNOWN_ERROR; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | /* |
| 186 | * Parse the Zip archive, verifying its contents and initializing internal |
| 187 | * data structures. |
| 188 | */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 189 | bool ZipFileRO::mapCentralDirectory(void) |
| 190 | { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 191 | ssize_t readAmount = kMaxEOCDSearch; |
| 192 | if (readAmount > (ssize_t) mFileLength) |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 193 | readAmount = mFileLength; |
| 194 | |
| 195 | unsigned char* scanBuf = (unsigned char*) malloc(readAmount); |
| 196 | if (scanBuf == NULL) { |
| 197 | LOGW("couldn't allocate scanBuf: %s", strerror(errno)); |
| 198 | free(scanBuf); |
| 199 | return false; |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * Make sure this is a Zip archive. |
| 204 | */ |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 205 | if (lseek64(mFd, 0, SEEK_SET) != 0) { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 206 | LOGW("seek to start failed: %s", strerror(errno)); |
| 207 | free(scanBuf); |
| 208 | return false; |
| 209 | } |
| 210 | |
| 211 | ssize_t actual = TEMP_FAILURE_RETRY(read(mFd, scanBuf, sizeof(int32_t))); |
| 212 | if (actual != (ssize_t) sizeof(int32_t)) { |
| 213 | LOGI("couldn't read first signature from zip archive: %s", strerror(errno)); |
| 214 | free(scanBuf); |
| 215 | return false; |
| 216 | } |
| 217 | |
| 218 | { |
| 219 | unsigned int header = get4LE(scanBuf); |
| 220 | if (header == kEOCDSignature) { |
| 221 | LOGI("Found Zip archive, but it looks empty\n"); |
| 222 | free(scanBuf); |
| 223 | return false; |
| 224 | } else if (header != kLFHSignature) { |
Steve Block | 6807e59 | 2011-10-20 11:56:00 +0100 | [diff] [blame^] | 225 | ALOGV("Not a Zip archive (found 0x%08x)\n", header); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 226 | free(scanBuf); |
| 227 | return false; |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * Perform the traditional EOCD snipe hunt. |
| 233 | * |
| 234 | * We're searching for the End of Central Directory magic number, |
| 235 | * which appears at the start of the EOCD block. It's followed by |
| 236 | * 18 bytes of EOCD stuff and up to 64KB of archive comment. We |
| 237 | * need to read the last part of the file into a buffer, dig through |
| 238 | * it to find the magic number, parse some values out, and use those |
| 239 | * to determine the extent of the CD. |
| 240 | * |
| 241 | * We start by pulling in the last part of the file. |
| 242 | */ |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 243 | off64_t searchStart = mFileLength - readAmount; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 244 | |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 245 | if (lseek64(mFd, searchStart, SEEK_SET) != searchStart) { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 246 | LOGW("seek %ld failed: %s\n", (long) searchStart, strerror(errno)); |
| 247 | free(scanBuf); |
| 248 | return false; |
| 249 | } |
| 250 | actual = TEMP_FAILURE_RETRY(read(mFd, scanBuf, readAmount)); |
| 251 | if (actual != (ssize_t) readAmount) { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 252 | LOGW("Zip: read " ZD ", expected " ZD ". Failed: %s\n", |
| 253 | (ZD_TYPE) actual, (ZD_TYPE) readAmount, strerror(errno)); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 254 | free(scanBuf); |
| 255 | return false; |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * Scan backward for the EOCD magic. In an archive without a trailing |
| 260 | * comment, we'll find it on the first try. (We may want to consider |
| 261 | * doing an initial minimal read; if we don't find it, retry with a |
| 262 | * second read as above.) |
| 263 | */ |
| 264 | int i; |
| 265 | for (i = readAmount - kEOCDLen; i >= 0; i--) { |
| 266 | if (scanBuf[i] == 0x50 && get4LE(&scanBuf[i]) == kEOCDSignature) { |
Steve Block | 6807e59 | 2011-10-20 11:56:00 +0100 | [diff] [blame^] | 267 | ALOGV("+++ Found EOCD at buf+%d\n", i); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 268 | break; |
| 269 | } |
| 270 | } |
| 271 | if (i < 0) { |
| 272 | LOGD("Zip: EOCD not found, %s is not zip\n", mFileName); |
| 273 | free(scanBuf); |
| 274 | return false; |
| 275 | } |
| 276 | |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 277 | off64_t eocdOffset = searchStart + i; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 278 | const unsigned char* eocdPtr = scanBuf + i; |
| 279 | |
| 280 | assert(eocdOffset < mFileLength); |
| 281 | |
| 282 | /* |
| 283 | * Grab the CD offset and size, and the number of entries in the |
Kenny Root | 8f20e5e | 2010-08-04 16:30:40 -0700 | [diff] [blame] | 284 | * archive. After that, we can release our EOCD hunt buffer. |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 285 | */ |
| 286 | unsigned int numEntries = get2LE(eocdPtr + kEOCDNumEntries); |
| 287 | unsigned int dirSize = get4LE(eocdPtr + kEOCDSize); |
| 288 | unsigned int dirOffset = get4LE(eocdPtr + kEOCDFileOffset); |
Kenny Root | 8f20e5e | 2010-08-04 16:30:40 -0700 | [diff] [blame] | 289 | free(scanBuf); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 290 | |
Kenny Root | 8f20e5e | 2010-08-04 16:30:40 -0700 | [diff] [blame] | 291 | // Verify that they look reasonable. |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 292 | if ((long long) dirOffset + (long long) dirSize > (long long) eocdOffset) { |
| 293 | LOGW("bad offsets (dir %ld, size %u, eocd %ld)\n", |
| 294 | (long) dirOffset, dirSize, (long) eocdOffset); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 295 | return false; |
| 296 | } |
| 297 | if (numEntries == 0) { |
| 298 | LOGW("empty archive?\n"); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 299 | return false; |
| 300 | } |
| 301 | |
Steve Block | 6807e59 | 2011-10-20 11:56:00 +0100 | [diff] [blame^] | 302 | ALOGV("+++ numEntries=%d dirSize=%d dirOffset=%d\n", |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 303 | numEntries, dirSize, dirOffset); |
| 304 | |
| 305 | mDirectoryMap = new FileMap(); |
| 306 | if (mDirectoryMap == NULL) { |
| 307 | LOGW("Unable to create directory map: %s", strerror(errno)); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 308 | return false; |
| 309 | } |
| 310 | |
| 311 | if (!mDirectoryMap->create(mFileName, mFd, dirOffset, dirSize, true)) { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 312 | LOGW("Unable to map '%s' (" ZD " to " ZD "): %s\n", mFileName, |
| 313 | (ZD_TYPE) dirOffset, (ZD_TYPE) (dirOffset + dirSize), strerror(errno)); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 314 | return false; |
| 315 | } |
| 316 | |
| 317 | mNumEntries = numEntries; |
| 318 | mDirectoryOffset = dirOffset; |
| 319 | |
| 320 | return true; |
| 321 | } |
| 322 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 323 | bool ZipFileRO::parseZipArchive(void) |
| 324 | { |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 325 | bool result = false; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 326 | const unsigned char* cdPtr = (const unsigned char*) mDirectoryMap->getDataPtr(); |
| 327 | size_t cdLength = mDirectoryMap->getDataLength(); |
| 328 | int numEntries = mNumEntries; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 329 | |
| 330 | /* |
| 331 | * Create hash table. We have a minimum 75% load factor, possibly as |
| 332 | * low as 50% after we round off to a power of 2. |
| 333 | */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 334 | mHashTableSize = roundUpPower2(1 + (numEntries * 4) / 3); |
| 335 | mHashTable = (HashEntry*) calloc(mHashTableSize, sizeof(HashEntry)); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 336 | |
| 337 | /* |
| 338 | * Walk through the central directory, adding entries to the hash |
| 339 | * table. |
| 340 | */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 341 | const unsigned char* ptr = cdPtr; |
| 342 | for (int i = 0; i < numEntries; i++) { |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 343 | if (get4LE(ptr) != kCDESignature) { |
| 344 | LOGW("Missed a central dir sig (at %d)\n", i); |
| 345 | goto bail; |
| 346 | } |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 347 | if (ptr + kCDELen > cdPtr + cdLength) { |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 348 | LOGW("Ran off the end (at %d)\n", i); |
| 349 | goto bail; |
| 350 | } |
| 351 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 352 | long localHdrOffset = (long) get4LE(ptr + kCDELocalOffset); |
| 353 | if (localHdrOffset >= mDirectoryOffset) { |
| 354 | LOGW("bad LFH offset %ld at entry %d\n", localHdrOffset, i); |
| 355 | goto bail; |
| 356 | } |
| 357 | |
| 358 | unsigned int fileNameLen, extraLen, commentLen, hash; |
| 359 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 360 | fileNameLen = get2LE(ptr + kCDENameLen); |
| 361 | extraLen = get2LE(ptr + kCDEExtraLen); |
| 362 | commentLen = get2LE(ptr + kCDECommentLen); |
| 363 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 364 | /* add the CDE filename to the hash table */ |
| 365 | hash = computeHash((const char*)ptr + kCDELen, fileNameLen); |
| 366 | addToHash((const char*)ptr + kCDELen, fileNameLen, hash); |
| 367 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 368 | ptr += kCDELen + fileNameLen + extraLen + commentLen; |
| 369 | if ((size_t)(ptr - cdPtr) > cdLength) { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 370 | LOGW("bad CD advance (%d vs " ZD ") at entry %d\n", |
| 371 | (int) (ptr - cdPtr), (ZD_TYPE) cdLength, i); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 372 | goto bail; |
| 373 | } |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 374 | } |
Steve Block | 6807e59 | 2011-10-20 11:56:00 +0100 | [diff] [blame^] | 375 | ALOGV("+++ zip good scan %d entries\n", numEntries); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 376 | result = true; |
| 377 | |
| 378 | bail: |
| 379 | return result; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 380 | } |
| 381 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 382 | /* |
| 383 | * Simple string hash function for non-null-terminated strings. |
| 384 | */ |
| 385 | /*static*/ unsigned int ZipFileRO::computeHash(const char* str, int len) |
| 386 | { |
| 387 | unsigned int hash = 0; |
| 388 | |
| 389 | while (len--) |
| 390 | hash = hash * 31 + *str++; |
| 391 | |
| 392 | return hash; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Add a new entry to the hash table. |
| 397 | */ |
| 398 | void ZipFileRO::addToHash(const char* str, int strLen, unsigned int hash) |
| 399 | { |
| 400 | int ent = hash & (mHashTableSize-1); |
| 401 | |
| 402 | /* |
| 403 | * We over-allocate the table, so we're guaranteed to find an empty slot. |
| 404 | */ |
| 405 | while (mHashTable[ent].name != NULL) |
| 406 | ent = (ent + 1) & (mHashTableSize-1); |
| 407 | |
| 408 | mHashTable[ent].name = str; |
| 409 | mHashTable[ent].nameLen = strLen; |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * Find a matching entry. |
| 414 | * |
Kenny Root | 06dbe50 | 2010-10-21 15:18:28 -0700 | [diff] [blame] | 415 | * Returns NULL if not found. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 416 | */ |
| 417 | ZipEntryRO ZipFileRO::findEntryByName(const char* fileName) const |
| 418 | { |
Kenny Root | 06dbe50 | 2010-10-21 15:18:28 -0700 | [diff] [blame] | 419 | /* |
| 420 | * If the ZipFileRO instance is not initialized, the entry number will |
| 421 | * end up being garbage since mHashTableSize is -1. |
| 422 | */ |
| 423 | if (mHashTableSize <= 0) { |
| 424 | return NULL; |
| 425 | } |
| 426 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 427 | int nameLen = strlen(fileName); |
| 428 | unsigned int hash = computeHash(fileName, nameLen); |
| 429 | int ent = hash & (mHashTableSize-1); |
| 430 | |
| 431 | while (mHashTable[ent].name != NULL) { |
| 432 | if (mHashTable[ent].nameLen == nameLen && |
| 433 | memcmp(mHashTable[ent].name, fileName, nameLen) == 0) |
| 434 | { |
| 435 | /* match */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 436 | return (ZipEntryRO)(long)(ent + kZipEntryAdj); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 437 | } |
| 438 | |
| 439 | ent = (ent + 1) & (mHashTableSize-1); |
| 440 | } |
| 441 | |
| 442 | return NULL; |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Find the Nth entry. |
| 447 | * |
| 448 | * This currently involves walking through the sparse hash table, counting |
| 449 | * non-empty entries. If we need to speed this up we can either allocate |
| 450 | * a parallel lookup table or (perhaps better) provide an iterator interface. |
| 451 | */ |
| 452 | ZipEntryRO ZipFileRO::findEntryByIndex(int idx) const |
| 453 | { |
| 454 | if (idx < 0 || idx >= mNumEntries) { |
| 455 | LOGW("Invalid index %d\n", idx); |
| 456 | return NULL; |
| 457 | } |
| 458 | |
| 459 | for (int ent = 0; ent < mHashTableSize; ent++) { |
| 460 | if (mHashTable[ent].name != NULL) { |
| 461 | if (idx-- == 0) |
| 462 | return (ZipEntryRO) (ent + kZipEntryAdj); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | return NULL; |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * Get the useful fields from the zip entry. |
| 471 | * |
| 472 | * Returns "false" if the offsets to the fields or the contents of the fields |
| 473 | * appear to be bogus. |
| 474 | */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 475 | bool ZipFileRO::getEntryInfo(ZipEntryRO entry, int* pMethod, size_t* pUncompLen, |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 476 | size_t* pCompLen, off64_t* pOffset, long* pModWhen, long* pCrc32) const |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 477 | { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 478 | bool ret = false; |
| 479 | |
| 480 | const int ent = entryToIndex(entry); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 481 | if (ent < 0) |
| 482 | return false; |
| 483 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 484 | HashEntry hashEntry = mHashTable[ent]; |
| 485 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 486 | /* |
| 487 | * Recover the start of the central directory entry from the filename |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 488 | * pointer. The filename is the first entry past the fixed-size data, |
| 489 | * so we can just subtract back from that. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 490 | */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 491 | const unsigned char* ptr = (const unsigned char*) hashEntry.name; |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 492 | off64_t cdOffset = mDirectoryOffset; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 493 | |
| 494 | ptr -= kCDELen; |
| 495 | |
| 496 | int method = get2LE(ptr + kCDEMethod); |
| 497 | if (pMethod != NULL) |
| 498 | *pMethod = method; |
| 499 | |
| 500 | if (pModWhen != NULL) |
| 501 | *pModWhen = get4LE(ptr + kCDEModWhen); |
| 502 | if (pCrc32 != NULL) |
| 503 | *pCrc32 = get4LE(ptr + kCDECRC); |
| 504 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 505 | size_t compLen = get4LE(ptr + kCDECompLen); |
| 506 | if (pCompLen != NULL) |
| 507 | *pCompLen = compLen; |
| 508 | size_t uncompLen = get4LE(ptr + kCDEUncompLen); |
| 509 | if (pUncompLen != NULL) |
| 510 | *pUncompLen = uncompLen; |
| 511 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 512 | /* |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 513 | * If requested, determine the offset of the start of the data. All we |
| 514 | * have is the offset to the Local File Header, which is variable size, |
| 515 | * so we have to read the contents of the struct to figure out where |
| 516 | * the actual data starts. |
| 517 | * |
| 518 | * We also need to make sure that the lengths are not so large that |
| 519 | * somebody trying to map the compressed or uncompressed data runs |
| 520 | * off the end of the mapped region. |
| 521 | * |
| 522 | * Note we don't verify compLen/uncompLen if they don't request the |
| 523 | * dataOffset, because dataOffset is expensive to determine. However, |
| 524 | * if they don't have the file offset, they're not likely to be doing |
| 525 | * anything with the contents. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 526 | */ |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 527 | if (pOffset != NULL) { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 528 | long localHdrOffset = get4LE(ptr + kCDELocalOffset); |
| 529 | if (localHdrOffset + kLFHLen >= cdOffset) { |
| 530 | LOGE("ERROR: bad local hdr offset in zip\n"); |
| 531 | return false; |
| 532 | } |
| 533 | |
| 534 | unsigned char lfhBuf[kLFHLen]; |
Kenny Root | fa98920 | 2010-09-24 07:57:37 -0700 | [diff] [blame] | 535 | |
Kenny Root | 61ef747 | 2010-10-04 14:20:14 -0700 | [diff] [blame] | 536 | #ifdef HAVE_PREAD |
| 537 | /* |
| 538 | * This file descriptor might be from zygote's preloaded assets, |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 539 | * so we need to do an pread64() instead of a lseek64() + read() to |
Kenny Root | 61ef747 | 2010-10-04 14:20:14 -0700 | [diff] [blame] | 540 | * guarantee atomicity across the processes with the shared file |
| 541 | * descriptors. |
| 542 | */ |
| 543 | ssize_t actual = |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 544 | TEMP_FAILURE_RETRY(pread64(mFd, lfhBuf, sizeof(lfhBuf), localHdrOffset)); |
Kenny Root | 61ef747 | 2010-10-04 14:20:14 -0700 | [diff] [blame] | 545 | |
| 546 | if (actual != sizeof(lfhBuf)) { |
| 547 | LOGW("failed reading lfh from offset %ld\n", localHdrOffset); |
| 548 | return false; |
| 549 | } |
| 550 | |
| 551 | if (get4LE(lfhBuf) != kLFHSignature) { |
| 552 | LOGW("didn't find signature at start of lfh; wanted: offset=%ld data=0x%08x; " |
| 553 | "got: data=0x%08lx\n", |
| 554 | localHdrOffset, kLFHSignature, get4LE(lfhBuf)); |
| 555 | return false; |
| 556 | } |
| 557 | #else /* HAVE_PREAD */ |
| 558 | /* |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 559 | * For hosts don't have pread64() we cannot guarantee atomic reads from |
Kenny Root | 61ef747 | 2010-10-04 14:20:14 -0700 | [diff] [blame] | 560 | * an offset in a file. Android should never run on those platforms. |
| 561 | * File descriptors inherited from a fork() share file offsets and |
| 562 | * there would be nothing to protect from two different processes |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 563 | * calling lseek64() concurrently. |
Kenny Root | 61ef747 | 2010-10-04 14:20:14 -0700 | [diff] [blame] | 564 | */ |
| 565 | |
Kenny Root | fa98920 | 2010-09-24 07:57:37 -0700 | [diff] [blame] | 566 | { |
| 567 | AutoMutex _l(mFdLock); |
| 568 | |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 569 | if (lseek64(mFd, localHdrOffset, SEEK_SET) != localHdrOffset) { |
Kenny Root | fa98920 | 2010-09-24 07:57:37 -0700 | [diff] [blame] | 570 | LOGW("failed seeking to lfh at offset %ld\n", localHdrOffset); |
| 571 | return false; |
| 572 | } |
| 573 | |
| 574 | ssize_t actual = |
Kenny Root | 61ef747 | 2010-10-04 14:20:14 -0700 | [diff] [blame] | 575 | TEMP_FAILURE_RETRY(read(mFd, lfhBuf, sizeof(lfhBuf))); |
Kenny Root | fa98920 | 2010-09-24 07:57:37 -0700 | [diff] [blame] | 576 | if (actual != sizeof(lfhBuf)) { |
| 577 | LOGW("failed reading lfh from offset %ld\n", localHdrOffset); |
| 578 | return false; |
| 579 | } |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 580 | |
Kenny Root | dbf6f27 | 2010-10-01 18:28:28 -0700 | [diff] [blame] | 581 | if (get4LE(lfhBuf) != kLFHSignature) { |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 582 | off64_t actualOffset = lseek64(mFd, 0, SEEK_CUR); |
Kenny Root | dbf6f27 | 2010-10-01 18:28:28 -0700 | [diff] [blame] | 583 | LOGW("didn't find signature at start of lfh; wanted: offset=%ld data=0x%08x; " |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 584 | "got: offset=" ZD " data=0x%08lx\n", |
| 585 | localHdrOffset, kLFHSignature, (ZD_TYPE) actualOffset, get4LE(lfhBuf)); |
Kenny Root | dbf6f27 | 2010-10-01 18:28:28 -0700 | [diff] [blame] | 586 | return false; |
| 587 | } |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 588 | } |
Kenny Root | 61ef747 | 2010-10-04 14:20:14 -0700 | [diff] [blame] | 589 | #endif /* HAVE_PREAD */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 590 | |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 591 | off64_t dataOffset = localHdrOffset + kLFHLen |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 592 | + get2LE(lfhBuf + kLFHNameLen) + get2LE(lfhBuf + kLFHExtraLen); |
| 593 | if (dataOffset >= cdOffset) { |
| 594 | LOGW("bad data offset %ld in zip\n", (long) dataOffset); |
| 595 | return false; |
| 596 | } |
| 597 | |
| 598 | /* check lengths */ |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 599 | if ((off64_t)(dataOffset + compLen) > cdOffset) { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 600 | LOGW("bad compressed length in zip (%ld + " ZD " > %ld)\n", |
| 601 | (long) dataOffset, (ZD_TYPE) compLen, (long) cdOffset); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 602 | return false; |
| 603 | } |
| 604 | |
| 605 | if (method == kCompressStored && |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 606 | (off64_t)(dataOffset + uncompLen) > cdOffset) |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 607 | { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 608 | LOGE("ERROR: bad uncompressed length in zip (%ld + " ZD " > %ld)\n", |
| 609 | (long) dataOffset, (ZD_TYPE) uncompLen, (long) cdOffset); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 610 | return false; |
| 611 | } |
| 612 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 613 | *pOffset = dataOffset; |
| 614 | } |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 615 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 616 | return true; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Copy the entry's filename to the buffer. |
| 621 | */ |
| 622 | int ZipFileRO::getEntryFileName(ZipEntryRO entry, char* buffer, int bufLen) |
| 623 | const |
| 624 | { |
| 625 | int ent = entryToIndex(entry); |
| 626 | if (ent < 0) |
| 627 | return -1; |
| 628 | |
| 629 | int nameLen = mHashTable[ent].nameLen; |
| 630 | if (bufLen < nameLen+1) |
| 631 | return nameLen+1; |
| 632 | |
| 633 | memcpy(buffer, mHashTable[ent].name, nameLen); |
| 634 | buffer[nameLen] = '\0'; |
| 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * Create a new FileMap object that spans the data in "entry". |
| 640 | */ |
| 641 | FileMap* ZipFileRO::createEntryFileMap(ZipEntryRO entry) const |
| 642 | { |
| 643 | /* |
| 644 | * TODO: the efficient way to do this is to modify FileMap to allow |
| 645 | * sub-regions of a file to be mapped. A reference-counting scheme |
| 646 | * can manage the base memory mapping. For now, we just create a brand |
| 647 | * new mapping off of the Zip archive file descriptor. |
| 648 | */ |
| 649 | |
| 650 | FileMap* newMap; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 651 | size_t compLen; |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 652 | off64_t offset; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 653 | |
| 654 | if (!getEntryInfo(entry, NULL, NULL, &compLen, &offset, NULL, NULL)) |
| 655 | return NULL; |
| 656 | |
| 657 | newMap = new FileMap(); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 658 | if (!newMap->create(mFileName, mFd, offset, compLen, true)) { |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 659 | newMap->release(); |
| 660 | return NULL; |
| 661 | } |
| 662 | |
| 663 | return newMap; |
| 664 | } |
| 665 | |
| 666 | /* |
| 667 | * Uncompress an entry, in its entirety, into the provided output buffer. |
| 668 | * |
| 669 | * This doesn't verify the data's CRC, which might be useful for |
| 670 | * uncompressed data. The caller should be able to manage it. |
| 671 | */ |
| 672 | bool ZipFileRO::uncompressEntry(ZipEntryRO entry, void* buffer) const |
| 673 | { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 674 | const size_t kSequentialMin = 32768; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 675 | bool result = false; |
| 676 | int ent = entryToIndex(entry); |
| 677 | if (ent < 0) |
| 678 | return -1; |
| 679 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 680 | int method; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 681 | size_t uncompLen, compLen; |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 682 | off64_t offset; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 683 | const unsigned char* ptr; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 684 | |
| 685 | getEntryInfo(entry, &method, &uncompLen, &compLen, &offset, NULL, NULL); |
| 686 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 687 | FileMap* file = createEntryFileMap(entry); |
| 688 | if (file == NULL) { |
| 689 | goto bail; |
| 690 | } |
| 691 | |
| 692 | ptr = (const unsigned char*) file->getDataPtr(); |
| 693 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 694 | /* |
| 695 | * Experiment with madvise hint. When we want to uncompress a file, |
| 696 | * we pull some stuff out of the central dir entry and then hit a |
| 697 | * bunch of compressed or uncompressed data sequentially. The CDE |
| 698 | * visit will cause a limited amount of read-ahead because it's at |
| 699 | * the end of the file. We could end up doing lots of extra disk |
| 700 | * access if the file we're prying open is small. Bottom line is we |
| 701 | * probably don't want to turn MADV_SEQUENTIAL on and leave it on. |
| 702 | * |
| 703 | * So, if the compressed size of the file is above a certain minimum |
| 704 | * size, temporarily boost the read-ahead in the hope that the extra |
| 705 | * pair of system calls are negated by a reduction in page faults. |
| 706 | */ |
| 707 | if (compLen > kSequentialMin) |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 708 | file->advise(FileMap::SEQUENTIAL); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 709 | |
| 710 | if (method == kCompressStored) { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 711 | memcpy(buffer, ptr, uncompLen); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 712 | } else { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 713 | if (!inflateBuffer(buffer, ptr, uncompLen, compLen)) |
Kenny Root | b47eafa | 2010-09-24 09:11:28 -0700 | [diff] [blame] | 714 | goto unmap; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | if (compLen > kSequentialMin) |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 718 | file->advise(FileMap::NORMAL); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 719 | |
| 720 | result = true; |
| 721 | |
Kenny Root | b47eafa | 2010-09-24 09:11:28 -0700 | [diff] [blame] | 722 | unmap: |
| 723 | file->release(); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 724 | bail: |
| 725 | return result; |
| 726 | } |
| 727 | |
| 728 | /* |
| 729 | * Uncompress an entry, in its entirety, to an open file descriptor. |
| 730 | * |
| 731 | * This doesn't verify the data's CRC, but probably should. |
| 732 | */ |
| 733 | bool ZipFileRO::uncompressEntry(ZipEntryRO entry, int fd) const |
| 734 | { |
| 735 | bool result = false; |
| 736 | int ent = entryToIndex(entry); |
| 737 | if (ent < 0) |
| 738 | return -1; |
| 739 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 740 | int method; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 741 | size_t uncompLen, compLen; |
Kenny Root | 18092dd | 2010-11-24 12:56:06 -0800 | [diff] [blame] | 742 | off64_t offset; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 743 | const unsigned char* ptr; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 744 | |
| 745 | getEntryInfo(entry, &method, &uncompLen, &compLen, &offset, NULL, NULL); |
| 746 | |
Kenny Root | b47eafa | 2010-09-24 09:11:28 -0700 | [diff] [blame] | 747 | FileMap* file = createEntryFileMap(entry); |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 748 | if (file == NULL) { |
| 749 | goto bail; |
| 750 | } |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 751 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 752 | ptr = (const unsigned char*) file->getDataPtr(); |
| 753 | |
| 754 | if (method == kCompressStored) { |
| 755 | ssize_t actual = write(fd, ptr, uncompLen); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 756 | if (actual < 0) { |
| 757 | LOGE("Write failed: %s\n", strerror(errno)); |
Kenny Root | b47eafa | 2010-09-24 09:11:28 -0700 | [diff] [blame] | 758 | goto unmap; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 759 | } else if ((size_t) actual != uncompLen) { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 760 | LOGE("Partial write during uncompress (" ZD " of " ZD ")\n", |
| 761 | (ZD_TYPE) actual, (ZD_TYPE) uncompLen); |
Kenny Root | b47eafa | 2010-09-24 09:11:28 -0700 | [diff] [blame] | 762 | goto unmap; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 763 | } else { |
| 764 | LOGI("+++ successful write\n"); |
| 765 | } |
| 766 | } else { |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 767 | if (!inflateBuffer(fd, ptr, uncompLen, compLen)) |
Kenny Root | b47eafa | 2010-09-24 09:11:28 -0700 | [diff] [blame] | 768 | goto unmap; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | result = true; |
| 772 | |
Kenny Root | b47eafa | 2010-09-24 09:11:28 -0700 | [diff] [blame] | 773 | unmap: |
| 774 | file->release(); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 775 | bail: |
| 776 | return result; |
| 777 | } |
| 778 | |
| 779 | /* |
| 780 | * Uncompress "deflate" data from one buffer to another. |
| 781 | */ |
| 782 | /*static*/ bool ZipFileRO::inflateBuffer(void* outBuf, const void* inBuf, |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 783 | size_t uncompLen, size_t compLen) |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 784 | { |
| 785 | bool result = false; |
| 786 | z_stream zstream; |
| 787 | int zerr; |
| 788 | |
| 789 | /* |
| 790 | * Initialize the zlib stream struct. |
| 791 | */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 792 | memset(&zstream, 0, sizeof(zstream)); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 793 | zstream.zalloc = Z_NULL; |
| 794 | zstream.zfree = Z_NULL; |
| 795 | zstream.opaque = Z_NULL; |
| 796 | zstream.next_in = (Bytef*)inBuf; |
| 797 | zstream.avail_in = compLen; |
| 798 | zstream.next_out = (Bytef*) outBuf; |
| 799 | zstream.avail_out = uncompLen; |
| 800 | zstream.data_type = Z_UNKNOWN; |
| 801 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 802 | /* |
| 803 | * Use the undocumented "negative window bits" feature to tell zlib |
| 804 | * that there's no zlib header waiting for it. |
| 805 | */ |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 806 | zerr = inflateInit2(&zstream, -MAX_WBITS); |
| 807 | if (zerr != Z_OK) { |
| 808 | if (zerr == Z_VERSION_ERROR) { |
| 809 | LOGE("Installed zlib is not compatible with linked version (%s)\n", |
| 810 | ZLIB_VERSION); |
| 811 | } else { |
| 812 | LOGE("Call to inflateInit2 failed (zerr=%d)\n", zerr); |
| 813 | } |
| 814 | goto bail; |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Expand data. |
| 819 | */ |
| 820 | zerr = inflate(&zstream, Z_FINISH); |
| 821 | if (zerr != Z_STREAM_END) { |
| 822 | LOGW("Zip inflate failed, zerr=%d (nIn=%p aIn=%u nOut=%p aOut=%u)\n", |
| 823 | zerr, zstream.next_in, zstream.avail_in, |
| 824 | zstream.next_out, zstream.avail_out); |
| 825 | goto z_bail; |
| 826 | } |
| 827 | |
| 828 | /* paranoia */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 829 | if (zstream.total_out != uncompLen) { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 830 | LOGW("Size mismatch on inflated file (%ld vs " ZD ")\n", |
| 831 | zstream.total_out, (ZD_TYPE) uncompLen); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 832 | goto z_bail; |
| 833 | } |
| 834 | |
| 835 | result = true; |
| 836 | |
| 837 | z_bail: |
| 838 | inflateEnd(&zstream); /* free up any allocated structures */ |
| 839 | |
| 840 | bail: |
| 841 | return result; |
| 842 | } |
| 843 | |
| 844 | /* |
| 845 | * Uncompress "deflate" data from one buffer to an open file descriptor. |
| 846 | */ |
| 847 | /*static*/ bool ZipFileRO::inflateBuffer(int fd, const void* inBuf, |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 848 | size_t uncompLen, size_t compLen) |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 849 | { |
| 850 | bool result = false; |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 851 | const size_t kWriteBufSize = 32768; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 852 | unsigned char writeBuf[kWriteBufSize]; |
| 853 | z_stream zstream; |
| 854 | int zerr; |
| 855 | |
| 856 | /* |
| 857 | * Initialize the zlib stream struct. |
| 858 | */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 859 | memset(&zstream, 0, sizeof(zstream)); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 860 | zstream.zalloc = Z_NULL; |
| 861 | zstream.zfree = Z_NULL; |
| 862 | zstream.opaque = Z_NULL; |
| 863 | zstream.next_in = (Bytef*)inBuf; |
| 864 | zstream.avail_in = compLen; |
| 865 | zstream.next_out = (Bytef*) writeBuf; |
| 866 | zstream.avail_out = sizeof(writeBuf); |
| 867 | zstream.data_type = Z_UNKNOWN; |
| 868 | |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 869 | /* |
| 870 | * Use the undocumented "negative window bits" feature to tell zlib |
| 871 | * that there's no zlib header waiting for it. |
| 872 | */ |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 873 | zerr = inflateInit2(&zstream, -MAX_WBITS); |
| 874 | if (zerr != Z_OK) { |
| 875 | if (zerr == Z_VERSION_ERROR) { |
| 876 | LOGE("Installed zlib is not compatible with linked version (%s)\n", |
| 877 | ZLIB_VERSION); |
| 878 | } else { |
| 879 | LOGE("Call to inflateInit2 failed (zerr=%d)\n", zerr); |
| 880 | } |
| 881 | goto bail; |
| 882 | } |
| 883 | |
| 884 | /* |
| 885 | * Loop while we have more to do. |
| 886 | */ |
| 887 | do { |
| 888 | /* |
| 889 | * Expand data. |
| 890 | */ |
| 891 | zerr = inflate(&zstream, Z_NO_FLUSH); |
| 892 | if (zerr != Z_OK && zerr != Z_STREAM_END) { |
| 893 | LOGW("zlib inflate: zerr=%d (nIn=%p aIn=%u nOut=%p aOut=%u)\n", |
| 894 | zerr, zstream.next_in, zstream.avail_in, |
| 895 | zstream.next_out, zstream.avail_out); |
| 896 | goto z_bail; |
| 897 | } |
| 898 | |
| 899 | /* write when we're full or when we're done */ |
| 900 | if (zstream.avail_out == 0 || |
| 901 | (zerr == Z_STREAM_END && zstream.avail_out != sizeof(writeBuf))) |
| 902 | { |
| 903 | long writeSize = zstream.next_out - writeBuf; |
| 904 | int cc = write(fd, writeBuf, writeSize); |
| 905 | if (cc != (int) writeSize) { |
| 906 | LOGW("write failed in inflate (%d vs %ld)\n", cc, writeSize); |
| 907 | goto z_bail; |
| 908 | } |
| 909 | |
| 910 | zstream.next_out = writeBuf; |
| 911 | zstream.avail_out = sizeof(writeBuf); |
| 912 | } |
| 913 | } while (zerr == Z_OK); |
| 914 | |
| 915 | assert(zerr == Z_STREAM_END); /* other errors should've been caught */ |
| 916 | |
| 917 | /* paranoia */ |
Kenny Root | d4066a4 | 2010-04-22 18:28:29 -0700 | [diff] [blame] | 918 | if (zstream.total_out != uncompLen) { |
Raphael Moll | 2cf43c6 | 2010-10-13 19:13:48 -0700 | [diff] [blame] | 919 | LOGW("Size mismatch on inflated file (%ld vs " ZD ")\n", |
| 920 | zstream.total_out, (ZD_TYPE) uncompLen); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 921 | goto z_bail; |
| 922 | } |
| 923 | |
| 924 | result = true; |
| 925 | |
| 926 | z_bail: |
| 927 | inflateEnd(&zstream); /* free up any allocated structures */ |
| 928 | |
| 929 | bail: |
| 930 | return result; |
| 931 | } |