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