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#include "brotli.h"
#include <contrib/libs/brotli/include/brotli/decode.h>
#include <contrib/libs/brotli/include/brotli/encode.h>
#include <util/generic/yexception.h>
#include <util/memory/addstorage.h>
namespace {
struct TAllocator {
static void* Allocate(void* /* opaque */, size_t size) {
return ::operator new(size);
}
static void Deallocate(void* /* opaque */, void* ptr) noexcept {
::operator delete(ptr);
}
};
}
class TBrotliCompress::TImpl {
public:
TImpl(IOutputStream* slave, int quality)
: Slave_(slave)
, EncoderState_(BrotliEncoderCreateInstance(&TAllocator::Allocate, &TAllocator::Deallocate, nullptr))
{
if (!EncoderState_) {
ythrow yexception() << "Brotli encoder initialization failed";
}
auto res = BrotliEncoderSetParameter(
EncoderState_,
BROTLI_PARAM_QUALITY,
quality);
if (!res) {
BrotliEncoderDestroyInstance(EncoderState_);
ythrow yexception() << "Failed to set brotli encoder quality to " << quality;
}
}
~TImpl() {
BrotliEncoderDestroyInstance(EncoderState_);
}
void Write(const void* buffer, size_t size) {
DoWrite(buffer, size, BROTLI_OPERATION_PROCESS);
}
void Flush() {
DoWrite(nullptr, 0, BROTLI_OPERATION_FLUSH);
}
void Finish() {
Flush();
DoWrite(nullptr, 0, BROTLI_OPERATION_FINISH);
Y_VERIFY(BrotliEncoderIsFinished(EncoderState_));
}
private:
IOutputStream* Slave_;
BrotliEncoderState* EncoderState_;
void DoWrite(const void* buffer, size_t size, BrotliEncoderOperation operation) {
size_t availableOut = 0;
ui8* outputBuffer = nullptr;
const ui8* uBuffer = static_cast<const ui8*>(buffer);
do {
auto result = BrotliEncoderCompressStream(
EncoderState_,
operation,
&size,
&uBuffer,
&availableOut,
&outputBuffer,
nullptr);
if (result == BROTLI_FALSE) {
ythrow yexception() << "Brotli encoder failed to process buffer";
}
size_t outputLength = 0;
const ui8* output = BrotliEncoderTakeOutput(EncoderState_, &outputLength);
if (outputLength > 0) {
Slave_->Write(output, outputLength);
}
} while (size > 0 || BrotliEncoderHasMoreOutput(EncoderState_));
}
};
TBrotliCompress::TBrotliCompress(IOutputStream* slave, int quality) {
Impl_.Reset(new TImpl(slave, quality));
}
TBrotliCompress::~TBrotliCompress() {
try {
Finish();
} catch (...) {
}
}
void TBrotliCompress::DoWrite(const void* buffer, size_t size) {
Impl_->Write(buffer, size);
}
void TBrotliCompress::DoFlush() {
if (Impl_) {
Impl_->Flush();
}
}
void TBrotliCompress::DoFinish() {
THolder<TImpl> impl(Impl_.Release());
if (impl) {
impl->Finish();
}
}
////////////////////////////////////////////////////////////////////////////////
class TBrotliDecompress::TImpl: public TAdditionalStorage<TImpl> {
public:
TImpl(IInputStream* slave)
: Slave_(slave)
{
InitDecoder();
}
~TImpl() {
FreeDecoder();
}
size_t Read(void* buffer, size_t size) {
Y_ASSERT(size > 0);
ui8* outBuffer = static_cast<ui8*>(buffer);
size_t availableOut = size;
size_t decompressedSize = 0;
BrotliDecoderResult result;
do {
if (InputAvailable_ == 0 && !InputExhausted_) {
InputBuffer_ = TmpBuf();
InputAvailable_ = Slave_->Read((void*)InputBuffer_, TmpBufLen());
if (InputAvailable_ == 0) {
InputExhausted_ = true;
}
}
if (SubstreamFinished_ && !InputExhausted_) {
ResetState();
}
result = BrotliDecoderDecompressStream(
DecoderState_,
&InputAvailable_,
&InputBuffer_,
&availableOut,
&outBuffer,
nullptr);
decompressedSize = size - availableOut;
SubstreamFinished_ = (result == BROTLI_DECODER_RESULT_SUCCESS);
if (result == BROTLI_DECODER_RESULT_ERROR) {
BrotliDecoderErrorCode code = BrotliDecoderGetErrorCode(DecoderState_);
ythrow yexception() << "Brotli decoder failed to decompress buffer: "
<< BrotliDecoderErrorString(code);
} else if (result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT) {
Y_VERIFY(availableOut != size,
"Buffer passed to read in Brotli decoder is too small");
break;
}
} while (decompressedSize == 0 && result == BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT && !InputExhausted_);
if (!SubstreamFinished_ && decompressedSize == 0) {
ythrow yexception() << "Input stream is incomplete";
}
return decompressedSize;
}
private:
IInputStream* Slave_;
BrotliDecoderState* DecoderState_;
bool SubstreamFinished_ = false;
bool InputExhausted_ = false;
const ui8* InputBuffer_ = nullptr;
size_t InputAvailable_ = 0;
unsigned char* TmpBuf() noexcept {
return static_cast<unsigned char*>(AdditionalData());
}
size_t TmpBufLen() const noexcept {
return AdditionalDataLength();
}
void InitDecoder() {
DecoderState_ = BrotliDecoderCreateInstance(&TAllocator::Allocate, &TAllocator::Deallocate, nullptr);
if (!DecoderState_) {
ythrow yexception() << "Brotli decoder initialization failed";
}
}
void FreeDecoder() {
BrotliDecoderDestroyInstance(DecoderState_);
}
void ResetState() {
Y_VERIFY(BrotliDecoderIsFinished(DecoderState_));
FreeDecoder();
InitDecoder();
}
};
TBrotliDecompress::TBrotliDecompress(IInputStream* slave, size_t bufferSize)
: Impl_(new (bufferSize) TImpl(slave))
{
}
TBrotliDecompress::~TBrotliDecompress() = default;
size_t TBrotliDecompress::DoRead(void* buffer, size_t size) {
return Impl_->Read(buffer, size);
}
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