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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// Miscellaneous zip/gzip utility functions.
//
#ifndef __LIBS_ZIPUTILS_H
#define __LIBS_ZIPUTILS_H
#include <stdio.h>
#include <time.h>
namespace android {
/*
* Container class for utility functions, primarily for namespace reasons.
*/
class ZipUtils {
public:
/*
* General utility function for uncompressing "deflate" data from a file
* to a buffer.
*/
static bool inflateToBuffer(FILE* fp, void* buf, long uncompressedLen,
long compressedLen);
static bool inflateToBuffer(int fd, void* buf, long uncompressedLen,
long compressedLen);
static bool inflateToBuffer(void *in, void* buf, long uncompressedLen,
long compressedLen);
/*
* Someday we might want to make this generic and handle bzip2 ".bz2"
* files too.
*
* We could declare gzip to be a sub-class of zip that has exactly
* one always-compressed entry, but we currently want to treat Zip
* and gzip as distinct, so there's no value.
*
* The zlib library has some gzip utilities, but it has no interface
* for extracting the uncompressed length of the file (you do *not*
* want to gzseek to the end).
*
* Pass in a seeked file pointer for the gzip file. If this is a gzip
* file, we set our return values appropriately and return "true" with
* the file seeked to the start of the compressed data.
*/
static bool examineGzip(FILE* fp, int* pCompressionMethod,
long* pUncompressedLen, long* pCompressedLen, unsigned long* pCRC32);
/*
* Utility function to convert ZIP's time format to a timespec struct.
*/
static inline void zipTimeToTimespec(long when, struct tm* timespec) {
const long date = when >> 16;
timespec->tm_year = ((date >> 9) & 0x7F) + 80; // Zip is years since 1980
timespec->tm_mon = (date >> 5) & 0x0F;
timespec->tm_mday = date & 0x1F;
timespec->tm_hour = (when >> 11) & 0x1F;
timespec->tm_min = (when >> 5) & 0x3F;
timespec->tm_sec = (when & 0x1F) << 1;
}
private:
ZipUtils() {}
~ZipUtils() {}
};
}; // namespace android
#endif /*__LIBS_ZIPUTILS_H*/
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