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#include "compressed.h"
#include "wire_format.h"
#include <util/generic/yexception.h>
#include <contrib/libs/lz4/lz4.h>
#include <contrib/restricted/cityhash-1.0.2/city.h>
#define DBMS_MAX_COMPRESSED_SIZE 0x40000000ULL // 1GB
namespace NClickHouse {
TCompressedInput::TCompressedInput(TCodedInputStream* input)
: Input_(input)
{
}
TCompressedInput::~TCompressedInput() {
if (!Mem_.Exhausted()) {
Y_ABORT("some data was not read");
}
}
size_t TCompressedInput::DoNext(const void** ptr, size_t len) {
if (Mem_.Exhausted()) {
if (!Decompress()) {
return 0;
}
}
return Mem_.Next(ptr, len);
}
bool TCompressedInput::Decompress() {
CityHash_v1_0_2::uint128 hash;
ui32 compressed = 0;
ui32 original = 0;
ui8 method = 0;
if (!TWireFormat::ReadFixed(Input_, &hash)) {
return false;
}
if (!TWireFormat::ReadFixed(Input_, &method)) {
return false;
}
if (method != 0x82) {
ythrow yexception() << "unsupported compression method "
<< int(method);
} else {
if (!TWireFormat::ReadFixed(Input_, &compressed)) {
return false;
}
if (!TWireFormat::ReadFixed(Input_, &original)) {
return false;
}
if (compressed > DBMS_MAX_COMPRESSED_SIZE) {
ythrow yexception() << "compressed data too big";
}
TTempBuf tmp(compressed);
// Заполнить заголовок сжатых данных.
tmp.Append(&method, sizeof(method));
tmp.Append(&compressed, sizeof(compressed));
tmp.Append(&original, sizeof(original));
if (!TWireFormat::ReadBytes(Input_, tmp.Data() + 9, compressed - 9)) {
return false;
} else {
if (hash != CityHash_v1_0_2::CityHash128(tmp.Data(), compressed)) {
ythrow yexception() << "data was corrupted";
}
}
Data_ = TTempBuf(original);
if (LZ4_decompress_fast(tmp.Data() + 9, Data_.Data(), original) < 0) {
ythrow yexception() << "can't decompress data";
} else {
Mem_.Reset(Data_.Data(), original);
}
}
return true;
}
}
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