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#include "bzip2.h"
#include <util/memory/addstorage.h>
#include <util/generic/scope.h>
#include <contrib/libs/libbz2/bzlib.h>
class TBZipDecompress::TImpl: public TAdditionalStorage<TImpl> {
public:
inline TImpl(IInputStream* input)
: Stream_(input)
{
Zero(BzStream_);
Init();
}
inline ~TImpl() {
Clear();
}
inline void Init() {
if (BZ2_bzDecompressInit(&BzStream_, 0, 0) != BZ_OK) {
ythrow TBZipDecompressError() << "can not init bzip engine";
}
}
inline void Clear() noexcept {
BZ2_bzDecompressEnd(&BzStream_);
}
inline size_t Read(void* buf, size_t size) {
BzStream_.next_out = (char*)buf;
BzStream_.avail_out = size;
while (true) {
if (BzStream_.avail_in == 0) {
if (FillInputBuffer() == 0) {
return 0;
}
}
switch (BZ2_bzDecompress(&BzStream_)) {
case BZ_STREAM_END: {
Clear();
Init();
[[fallthrough]];
}
case BZ_OK: {
const size_t processed = size - BzStream_.avail_out;
if (processed) {
return processed;
}
break;
}
default:
ythrow TBZipDecompressError() << "bzip error";
}
}
}
inline size_t FillInputBuffer() {
BzStream_.next_in = (char*)AdditionalData();
BzStream_.avail_in = Stream_->Read(BzStream_.next_in, AdditionalDataLength());
return BzStream_.avail_in;
}
private:
IInputStream* Stream_;
bz_stream BzStream_;
};
TBZipDecompress::TBZipDecompress(IInputStream* input, size_t bufLen)
: Impl_(new (bufLen) TImpl(input))
{
}
TBZipDecompress::~TBZipDecompress() {
}
size_t TBZipDecompress::DoRead(void* buf, size_t size) {
return Impl_->Read(buf, size);
}
class TBZipCompress::TImpl: public TAdditionalStorage<TImpl> {
public:
inline TImpl(IOutputStream* stream, size_t level)
: Stream_(stream)
{
Zero(BzStream_);
if (BZ2_bzCompressInit(&BzStream_, level, 0, 0) != BZ_OK) {
ythrow TBZipCompressError() << "can not init bzip engine";
}
BzStream_.next_out = TmpBuf();
BzStream_.avail_out = TmpBufLen();
}
inline ~TImpl() {
BZ2_bzCompressEnd(&BzStream_);
}
inline void Write(const void* buf, size_t size) {
BzStream_.next_in = (char*)buf;
BzStream_.avail_in = size;
Y_DEFER {
BzStream_.next_in = 0;
BzStream_.avail_in = 0;
};
while (BzStream_.avail_in) {
const int ret = BZ2_bzCompress(&BzStream_, BZ_RUN);
switch (ret) {
case BZ_RUN_OK:
continue;
case BZ_PARAM_ERROR:
case BZ_OUTBUFF_FULL:
Stream_->Write(TmpBuf(), TmpBufLen() - BzStream_.avail_out);
BzStream_.next_out = TmpBuf();
BzStream_.avail_out = TmpBufLen();
break;
default:
ythrow TBZipCompressError() << "bzip error(" << ret << ", " << BzStream_.avail_out << ")";
}
}
}
inline void Flush() {
/*
* TODO ?
*/
}
inline void Finish() {
int ret = BZ2_bzCompress(&BzStream_, BZ_FINISH);
while (ret != BZ_STREAM_END) {
Stream_->Write(TmpBuf(), TmpBufLen() - BzStream_.avail_out);
BzStream_.next_out = TmpBuf();
BzStream_.avail_out = TmpBufLen();
ret = BZ2_bzCompress(&BzStream_, BZ_FINISH);
}
Stream_->Write(TmpBuf(), TmpBufLen() - BzStream_.avail_out);
}
private:
inline char* TmpBuf() noexcept {
return (char*)AdditionalData();
}
inline size_t TmpBufLen() const noexcept {
return AdditionalDataLength();
}
private:
IOutputStream* Stream_;
bz_stream BzStream_;
};
TBZipCompress::TBZipCompress(IOutputStream* out, size_t compressionLevel, size_t bufLen)
: Impl_(new (bufLen) TImpl(out, compressionLevel))
{
}
TBZipCompress::~TBZipCompress() {
try {
Finish();
} catch (...) {
}
}
void TBZipCompress::DoWrite(const void* buf, size_t size) {
if (!Impl_) {
ythrow TBZipCompressError() << "can not write to finished bzip stream";
}
Impl_->Write(buf, size);
}
void TBZipCompress::DoFlush() {
if (Impl_) {
Impl_->Flush();
}
}
void TBZipCompress::DoFinish() {
THolder<TImpl> impl(Impl_.Release());
if (impl) {
impl->Finish();
}
}
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