aae73e748c
This lets us share zip archive processing code with both the runtime (Art, dalvik) and critical java code (StrictJarFile). This change also moves several utility methods to ZipUtils and dedups code across several zip inflation methods. One of the side effects of this change is that several processing loops are now O(n) instead of O(n^2). bug: 10193060 (cherry picked from commit afd31e08299008fdc5c2813f21b2573f29dc53df) Change-Id: Iae67e62f1dc6dfc3f43e29bc38e3ffd1cb14d191
84 lines
2.7 KiB
C++
84 lines
2.7 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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#include <time.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(FILE* fp, void* buf, long uncompressedLen,
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long compressedLen);
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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(void *in, 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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/*
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* Utility function to convert ZIP's time format to a timespec struct.
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*/
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static inline void zipTimeToTimespec(long when, struct tm* timespec) {
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const long date = when >> 16;
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timespec->tm_year = ((date >> 9) & 0x7F) + 80; // Zip is years since 1980
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timespec->tm_mon = (date >> 5) & 0x0F;
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timespec->tm_mday = date & 0x1F;
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timespec->tm_hour = (when >> 11) & 0x1F;
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timespec->tm_min = (when >> 5) & 0x3F;
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timespec->tm_sec = (when & 0x1F) << 1;
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}
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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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