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bz2_stream.cpp
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bz2_stream.cpp
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/*********************************************************************
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Willow Garage, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Willow Garage, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
********************************************************************/
#include "rosbag/chunked_file.h"
#include <iostream>
#include <cstring>
#include "console_bridge/console.h"
using std::string;
namespace rosbag {
BZ2Stream::BZ2Stream(ChunkedFile* file) :
Stream(file),
verbosity_(0),
block_size_100k_(9),
work_factor_(30),
bzfile_(NULL),
bzerror_(0)
{ }
CompressionType BZ2Stream::getCompressionType() const {
return compression::BZ2;
}
void BZ2Stream::startWrite() {
bzfile_ = BZ2_bzWriteOpen(&bzerror_, getFilePointer(), block_size_100k_, verbosity_, work_factor_);
switch (bzerror_) {
case BZ_OK: break;
default: {
BZ2_bzWriteClose(&bzerror_, bzfile_, 0, NULL, NULL);
throw BagException("Error opening file for writing compressed stream");
}
}
setCompressedIn(0);
}
void BZ2Stream::write(void* ptr, size_t size) {
BZ2_bzWrite(&bzerror_, bzfile_, ptr, size);
switch (bzerror_) {
case BZ_IO_ERROR: throw BagException("BZ_IO_ERROR: error writing the compressed file");
}
setCompressedIn(getCompressedIn() + size);
}
void BZ2Stream::stopWrite() {
unsigned int nbytes_in;
unsigned int nbytes_out;
BZ2_bzWriteClose(&bzerror_, bzfile_, 0, &nbytes_in, &nbytes_out);
switch (bzerror_) {
case BZ_IO_ERROR: throw BagIOException("BZ_IO_ERROR");
}
advanceOffset(nbytes_out);
setCompressedIn(0);
}
void BZ2Stream::startRead() {
bzfile_ = BZ2_bzReadOpen(&bzerror_, getFilePointer(), verbosity_, 0, getUnused(), getUnusedLength());
switch (bzerror_) {
case BZ_OK: break;
default: {
BZ2_bzReadClose(&bzerror_, bzfile_);
throw BagException("Error opening file for reading compressed stream");
}
}
clearUnused();
}
void BZ2Stream::read(void* ptr, size_t size) {
BZ2_bzRead(&bzerror_, bzfile_, ptr, size);
advanceOffset(size);
switch (bzerror_) {
case BZ_OK: return;
case BZ_STREAM_END:
if (getUnused() || getUnusedLength() > 0)
logError("unused data already available");
else {
char* unused;
int nUnused;
BZ2_bzReadGetUnused(&bzerror_, bzfile_, (void**) &unused, &nUnused);
setUnused(unused);
setUnusedLength(nUnused);
}
return;
case BZ_IO_ERROR: throw BagIOException("BZ_IO_ERROR: error reading from compressed stream"); break;
case BZ_UNEXPECTED_EOF: throw BagIOException("BZ_UNEXPECTED_EOF: compressed stream ended before logical end-of-stream detected"); break;
case BZ_DATA_ERROR: throw BagIOException("BZ_DATA_ERROR: data integrity error detected in compressed stream"); break;
case BZ_DATA_ERROR_MAGIC: throw BagIOException("BZ_DATA_ERROR_MAGIC: stream does not begin with requisite header bytes"); break;
case BZ_MEM_ERROR: throw BagIOException("BZ_MEM_ERROR: insufficient memory available"); break;
}
}
void BZ2Stream::stopRead() {
BZ2_bzReadClose(&bzerror_, bzfile_);
switch (bzerror_) {
case BZ_IO_ERROR: throw BagIOException("BZ_IO_ERROR");
}
}
void BZ2Stream::decompress(uint8_t* dest, unsigned int dest_len, uint8_t* source, unsigned int source_len) {
int result = BZ2_bzBuffToBuffDecompress((char*) dest, &dest_len, (char*) source, source_len, 0, verbosity_);
switch (result) {
case BZ_OK: break;
case BZ_CONFIG_ERROR: throw BagException("library has been mis-compiled"); break;
case BZ_PARAM_ERROR: throw BagException("dest is NULL or destLen is NULL or small != 0 && small != 1 or verbosity < 0 or verbosity > 4"); break;
case BZ_MEM_ERROR: throw BagException("insufficient memory is available"); break;
case BZ_OUTBUFF_FULL: throw BagException("size of the compressed data exceeds *destLen"); break;
case BZ_DATA_ERROR: throw BagException("data integrity error was detected in the compressed data"); break;
case BZ_DATA_ERROR_MAGIC: throw BagException("compressed data doesn't begin with the right magic bytes"); break;
case BZ_UNEXPECTED_EOF: throw BagException("compressed data ends unexpectedly"); break;
}
}
} // namespace rosbag