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 // Miscellaneous zip/gzip utility functions. 19 // 20 #ifndef __LIBS_ZIPUTILS_H 21 #define __LIBS_ZIPUTILS_H 22 23 #include <stdio.h> 24 25 namespace android { 26 27 /* 28 * Container class for utility functions, primarily for namespace reasons. 29 */ 30 class ZipUtils { 31 public: 32 /* 33 * General utility function for uncompressing "deflate" data from a file 34 * to a buffer. 35 */ 36 static bool inflateToBuffer(int fd, void* buf, long uncompressedLen, 37 long compressedLen); 38 static bool inflateToBuffer(FILE* fp, void* buf, long uncompressedLen, 39 long compressedLen); 40 41 /* 42 * Someday we might want to make this generic and handle bzip2 ".bz2" 43 * files too. 44 * 45 * We could declare gzip to be a sub-class of zip that has exactly 46 * one always-compressed entry, but we currently want to treat Zip 47 * and gzip as distinct, so there's no value. 48 * 49 * The zlib library has some gzip utilities, but it has no interface 50 * for extracting the uncompressed length of the file (you do *not* 51 * want to gzseek to the end). 52 * 53 * Pass in a seeked file pointer for the gzip file. If this is a gzip 54 * file, we set our return values appropriately and return "true" with 55 * the file seeked to the start of the compressed data. 56 */ 57 static bool examineGzip(FILE* fp, int* pCompressionMethod, 58 long* pUncompressedLen, long* pCompressedLen, unsigned long* pCRC32); 59 60 private: 61 ZipUtils() {} 62 ~ZipUtils() {} 63 }; 64 65 }; // namespace android 66 67 #endif /*__LIBS_ZIPUTILS_H*/ 68
