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The Android Open Source Project9066cfe2009-03-03 19:31:44 -08001/*
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
25namespace android {
26
27/*
28 * Container class for utility functions, primarily for namespace reasons.
29 */
30class ZipUtils {
31public:
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
60private:
61 ZipUtils() {}
62 ~ZipUtils() {}
63};
64
65}; // namespace android
66
67#endif /*__LIBS_ZIPUTILS_H*/