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#include "stream.h"
#include "codecs.h"
#include <util/digest/murmur.h>
#include <util/generic/scope.h>
#include <util/generic/cast.h>
#include <util/generic/hash.h>
#include <util/generic/singleton.h>
#include <util/stream/mem.h>
#include <util/ysaveload.h>
using namespace NBlockCodecs;
namespace {
constexpr size_t MAX_BUF_LEN = 128 * 1024 * 1024;
typedef ui16 TCodecID;
typedef ui64 TBlockLen;
struct TIds {
inline TIds() {
const TCodecList lst = ListAllCodecs();
for (size_t i = 0; i < lst.size(); ++i) {
const ICodec* c = Codec(lst[i]);
ByID[CodecID(c)] = c;
}
}
static inline TCodecID CodecID(const ICodec* c) {
const TStringBuf name = c->Name();
union {
ui16 Parts[2];
ui32 Data;
} x;
x.Data = MurmurHash<ui32>(name.data(), name.size());
return x.Parts[1] ^ x.Parts[0];
}
inline const ICodec* Find(TCodecID id) const {
TByID::const_iterator it = ByID.find(id);
if (it != ByID.end()) {
return it->second;
}
ythrow yexception() << "can not find codec by id " << id;
}
typedef THashMap<TCodecID, const ICodec*> TByID;
TByID ByID;
};
TCodecID CodecID(const ICodec* c) {
return TIds::CodecID(c);
}
const ICodec* CodecByID(TCodecID id) {
return Singleton<TIds>()->Find(id);
}
}
TCodedOutput::TCodedOutput(IOutputStream* out, const ICodec* c, size_t bufLen)
: C_(c)
, D_(bufLen)
, S_(out)
{
if (bufLen > MAX_BUF_LEN) {
ythrow yexception() << TStringBuf("too big buffer size: ") << bufLen;
}
}
TCodedOutput::~TCodedOutput() {
try {
Finish();
} catch (...) {
}
}
void TCodedOutput::DoWrite(const void* buf, size_t len) {
const char* in = (const char*)buf;
while (len) {
const size_t avail = D_.Avail();
if (len < avail) {
D_.Append(in, len);
return;
}
D_.Append(in, avail);
Y_ASSERT(!D_.Avail());
in += avail;
len -= avail;
Y_VERIFY(FlushImpl(), "flush on writing failed");
}
}
bool TCodedOutput::FlushImpl() {
const bool ret = !D_.Empty();
const size_t payload = sizeof(TCodecID) + sizeof(TBlockLen);
O_.Reserve(C_->MaxCompressedLength(D_) + payload);
void* out = O_.Data() + payload;
const size_t olen = C_->Compress(D_, out);
{
TMemoryOutput mo(O_.Data(), payload);
::Save(&mo, CodecID(C_));
::Save(&mo, SafeIntegerCast<TBlockLen>(olen));
}
S_->Write(O_.Data(), payload + olen);
D_.Clear();
O_.Clear();
return ret;
}
void TCodedOutput::DoFlush() {
if (S_ && !D_.Empty()) {
FlushImpl();
}
}
void TCodedOutput::DoFinish() {
if (S_) {
Y_DEFER {
S_ = nullptr;
};
if (FlushImpl()) {
//always write zero-length block as eos marker
FlushImpl();
}
}
}
TDecodedInput::TDecodedInput(IInputStream* in)
: S_(in)
, C_(nullptr)
{
}
TDecodedInput::TDecodedInput(IInputStream* in, const ICodec* codec)
: S_(in)
, C_(codec)
{
}
TDecodedInput::~TDecodedInput() = default;
size_t TDecodedInput::DoUnboundedNext(const void** ptr) {
if (!S_) {
return 0;
}
TCodecID codecId;
TBlockLen blockLen;
{
const size_t payload = sizeof(TCodecID) + sizeof(TBlockLen);
char buf[32];
S_->LoadOrFail(buf, payload);
TMemoryInput in(buf, payload);
::Load(&in, codecId);
::Load(&in, blockLen);
}
if (!blockLen) {
S_ = nullptr;
return 0;
}
if (Y_UNLIKELY(blockLen > 1024 * 1024 * 1024)) {
ythrow yexception() << "block size exceeds 1 GiB";
}
TBuffer block;
block.Resize(blockLen);
S_->LoadOrFail(block.Data(), blockLen);
auto codec = CodecByID(codecId);
if (C_) {
Y_ENSURE(C_->Name() == codec->Name(), TStringBuf("incorrect stream codec"));
}
if (codec->DecompressedLength(block) > MAX_BUF_LEN) {
ythrow yexception() << "broken stream";
}
codec->Decode(block, D_);
*ptr = D_.Data();
return D_.Size();
}
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