1 /* 2 * Copyright (C) 2006 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 // General-purpose Zip archive access. This class allows both reading and 19 // writing to Zip archives, including deletion of existing entries. 20 // 21 #ifndef __LIBS_ZIPFILE_H 22 #define __LIBS_ZIPFILE_H 23 24 #include <utils/Vector.h> 25 #include <utils/Errors.h> 26 #include <stdio.h> 27 28 #include "ZipEntry.h" 29 30 namespace android { 31 32 /* 33 * Manipulate a Zip archive. 34 * 35 * Some changes will not be visible in the until until "flush" is called. 36 * 37 * The correct way to update a file archive is to make all changes to a 38 * copy of the archive in a temporary file, and then unlink/rename over 39 * the original after everything completes. Because we're only interested 40 * in using this for packaging, we don't worry about such things. Crashing 41 * after making changes and before flush() completes could leave us with 42 * an unusable Zip archive. 43 */ 44 class ZipFile { 45 public: 46 ZipFile(void) 47 : mZipFp(NULL), mReadOnly(false), mNeedCDRewrite(false) 48 {} 49 ~ZipFile(void) { 50 if (!mReadOnly) 51 flush(); 52 if (mZipFp != NULL) 53 fclose(mZipFp); 54 discardEntries(); 55 } 56 57 /* 58 * Open a new or existing archive. 59 */ 60 enum { 61 kOpenReadOnly = 0x01, 62 kOpenReadWrite = 0x02, 63 kOpenCreate = 0x04, // create if it doesn't exist 64 kOpenTruncate = 0x08, // if it exists, empty it 65 }; 66 status_t open(const char* zipFileName, int flags); 67 68 /* 69 * Add a file to the end of the archive. Specify whether you want the 70 * library to try to store it compressed. 71 * 72 * If "storageName" is specified, the archive will use that instead 73 * of "fileName". 74 * 75 * If there is already an entry with the same name, the call fails. 76 * Existing entries with the same name must be removed first. 77 * 78 * If "ppEntry" is non-NULL, a pointer to the new entry will be returned. 79 */ 80 status_t add(const char* fileName, int compressionMethod, 81 ZipEntry** ppEntry) 82 { 83 return add(fileName, fileName, compressionMethod, ppEntry); 84 } 85 status_t add(const char* fileName, const char* storageName, 86 int compressionMethod, ZipEntry** ppEntry) 87 { 88 return addCommon(fileName, NULL, 0, storageName, 89 compressionMethod, ppEntry); 90 } 91 92 /* 93 * Add a file from an in-memory data buffer. 94 * 95 * If "ppEntry" is non-NULL, a pointer to the new entry will be returned. 96 */ 97 status_t add(const void* data, size_t size, const char* storageName, 98 int compressionMethod, ZipEntry** ppEntry) 99 { 100 return addCommon(NULL, data, size, storageName, 101 compressionMethod, ppEntry); 102 } 103 104 /* 105 * Add an entry by copying it from another zip file. If "padding" is 106 * nonzero, the specified number of bytes will be added to the "extra" 107 * field in the header. 108 * 109 * If "ppEntry" is non-NULL, a pointer to the new entry will be returned. 110 */ 111 status_t add(const ZipFile* pSourceZip, const ZipEntry* pSourceEntry, 112 int padding, ZipEntry** ppEntry); 113 114 /* 115 * Add an entry by copying it from another zip file, recompressing with 116 * Zopfli if already compressed. 117 * 118 * If "ppEntry" is non-NULL, a pointer to the new entry will be returned. 119 */ 120 status_t addRecompress(const ZipFile* pSourceZip, const ZipEntry* pSourceEntry, 121 ZipEntry** ppEntry); 122 123 /* 124 * Mark an entry as having been removed. It is not actually deleted 125 * from the archive or our internal data structures until flush() is 126 * called. 127 */ 128 status_t remove(ZipEntry* pEntry); 129 130 /* 131 * Flush changes. If mNeedCDRewrite is set, this writes the central dir. 132 */ 133 status_t flush(void); 134 135 /* 136 * Expand the data into the buffer provided. The buffer must hold 137 * at least <uncompressed len> bytes. Variation expands directly 138 * to a file. 139 * 140 * Returns "false" if an error was encountered in the compressed data. 141 */ 142 //bool uncompress(const ZipEntry* pEntry, void* buf) const; 143 //bool uncompress(const ZipEntry* pEntry, FILE* fp) const; 144 void* uncompress(const ZipEntry* pEntry) const; 145 146 /* 147 * Get an entry, by name. Returns NULL if not found. 148 * 149 * Does not return entries pending deletion. 150 */ 151 ZipEntry* getEntryByName(const char* fileName) const; 152 153 /* 154 * Get the Nth entry in the archive. 155 * 156 * This will return an entry that is pending deletion. 157 */ 158 int getNumEntries(void) const { return mEntries.size(); } 159 ZipEntry* getEntryByIndex(int idx) const; 160 161 private: 162 /* these are private and not defined */ 163 ZipFile(const ZipFile& src); 164 ZipFile& operator=(const ZipFile& src); 165 166 class EndOfCentralDir { 167 public: 168 EndOfCentralDir(void) : 169 mDiskNumber(0), 170 mDiskWithCentralDir(0), 171 mNumEntries(0), 172 mTotalNumEntries(0), 173 mCentralDirSize(0), 174 mCentralDirOffset(0), 175 mCommentLen(0), 176 mComment(NULL) 177 {} 178 virtual ~EndOfCentralDir(void) { 179 delete[] mComment; 180 } 181 182 status_t readBuf(const uint8_t* buf, int len); 183 status_t write(FILE* fp); 184 185 //uint32_t mSignature; 186 uint16_t mDiskNumber; 187 uint16_t mDiskWithCentralDir; 188 uint16_t mNumEntries; 189 uint16_t mTotalNumEntries; 190 uint32_t mCentralDirSize; 191 uint32_t mCentralDirOffset; // offset from first disk 192 uint16_t mCommentLen; 193 uint8_t* mComment; 194 195 enum { 196 kSignature = 0x06054b50, 197 kEOCDLen = 22, // EndOfCentralDir len, excl. comment 198 199 kMaxCommentLen = 65535, // longest possible in ushort 200 kMaxEOCDSearch = kMaxCommentLen + EndOfCentralDir::kEOCDLen, 201 202 }; 203 204 void dump(void) const; 205 }; 206 207 208 /* read all entries in the central dir */ 209 status_t readCentralDir(void); 210 211 /* crunch deleted entries out */ 212 status_t crunchArchive(void); 213 214 /* clean up mEntries */ 215 void discardEntries(void); 216 217 /* common handler for all "add" functions */ 218 status_t addCommon(const char* fileName, const void* data, size_t size, 219 const char* storageName, int compressionMethod, ZipEntry** ppEntry); 220 221 /* copy all of "srcFp" into "dstFp" */ 222 status_t copyFpToFp(FILE* dstFp, FILE* srcFp, uint32_t* pCRC32); 223 /* copy all of "data" into "dstFp" */ 224 status_t copyDataToFp(FILE* dstFp, 225 const void* data, size_t size, uint32_t* pCRC32); 226 /* copy some of "srcFp" into "dstFp" */ 227 status_t copyPartialFpToFp(FILE* dstFp, FILE* srcFp, size_t length, 228 uint32_t* pCRC32); 229 /* like memmove(), but on parts of a single file */ 230 status_t filemove(FILE* fp, off_t dest, off_t src, size_t n); 231 /* compress all of "srcFp" into "dstFp", using Deflate */ 232 status_t compressFpToFp(FILE* dstFp, FILE* srcFp, 233 const void* data, size_t size, uint32_t* pCRC32); 234 235 /* get modification date from a file descriptor */ 236 time_t getModTime(int fd); 237 238 /* 239 * We use stdio FILE*, which gives us buffering but makes dealing 240 * with files >2GB awkward. Until we support Zip64, we're fine. 241 */ 242 FILE* mZipFp; // Zip file pointer 243 244 /* one of these per file */ 245 EndOfCentralDir mEOCD; 246 247 /* did we open this read-only? */ 248 bool mReadOnly; 249 250 /* set this when we trash the central dir */ 251 bool mNeedCDRewrite; 252 253 /* 254 * One ZipEntry per entry in the zip file. I'm using pointers instead 255 * of objects because it's easier than making operator= work for the 256 * classes and sub-classes. 257 */ 258 Vector<ZipEntry*> mEntries; 259 }; 260 261 }; // namespace android 262 263 #endif // __LIBS_ZIPFILE_H 264
