e2fa7dc58e
The asset system and supporting libraries were using off_t instead of off64_t to access files larger than 2GB (32-bit signed). This change replaces all off_t with off64_t and lseek64. There is a new utils/Compat.h added for Mac OS compatibility. Also fixed some size-related compiler warnings. Bug: 3205336 Change-Id: I9097b3cb7a602e811fe52f245939d8975da55e9e
84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
/*
|
|
* Copyright (C) 2010 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.
|
|
*/
|
|
|
|
#ifndef __LIBS_STREAMINGZIPINFLATER_H
|
|
#define __LIBS_STREAMINGZIPINFLATER_H
|
|
|
|
#include <unistd.h>
|
|
#include <inttypes.h>
|
|
#include <zlib.h>
|
|
|
|
#include <utils/Compat.h>
|
|
|
|
namespace android {
|
|
|
|
class StreamingZipInflater {
|
|
public:
|
|
static const size_t INPUT_CHUNK_SIZE = 64 * 1024;
|
|
static const size_t OUTPUT_CHUNK_SIZE = 64 * 1024;
|
|
|
|
// Flavor that pages in the compressed data from a fd
|
|
StreamingZipInflater(int fd, off64_t compDataStart, size_t uncompSize, size_t compSize);
|
|
|
|
// Flavor that gets the compressed data from an in-memory buffer
|
|
StreamingZipInflater(class FileMap* dataMap, size_t uncompSize);
|
|
|
|
~StreamingZipInflater();
|
|
|
|
// read 'count' bytes of uncompressed data from the current position. outBuf may
|
|
// be NULL, in which case the data is consumed and discarded.
|
|
ssize_t read(void* outBuf, size_t count);
|
|
|
|
// seeking backwards requires uncompressing fom the beginning, so is very
|
|
// expensive. seeking forwards only requires uncompressing from the current
|
|
// position to the destination.
|
|
off64_t seekAbsolute(off64_t absoluteInputPosition);
|
|
|
|
private:
|
|
void initInflateState();
|
|
int readNextChunk();
|
|
|
|
// where to find the uncompressed data
|
|
int mFd;
|
|
off64_t mInFileStart; // where the compressed data lives in the file
|
|
class FileMap* mDataMap;
|
|
|
|
z_stream mInflateState;
|
|
bool mStreamNeedsInit;
|
|
|
|
// output invariants for this asset
|
|
uint8_t* mOutBuf; // output buf for decompressed bytes
|
|
size_t mOutBufSize; // allocated size of mOutBuf
|
|
size_t mOutTotalSize; // total uncompressed size of the blob
|
|
|
|
// current output state bookkeeping
|
|
off64_t mOutCurPosition; // current position in total offset
|
|
size_t mOutLastDecoded; // last decoded byte + 1 in mOutbuf
|
|
size_t mOutDeliverable; // next undelivered byte of decoded output in mOutBuf
|
|
|
|
// input invariants
|
|
uint8_t* mInBuf;
|
|
size_t mInBufSize; // allocated size of mInBuf;
|
|
size_t mInTotalSize; // total size of compressed data for this blob
|
|
|
|
// input state bookkeeping
|
|
size_t mInNextChunkOffset; // offset from start of blob at which the next input chunk lies
|
|
// the z_stream contains state about input block consumption
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|