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#include "clickhouse_config.h"
#if USE_SNAPPY
#include <fcntl.h>
#include <sys/types.h>
#include <memory>
#include <string>
#include <cstring>
#include <snappy-c.h>
#include "HadoopSnappyReadBuffer.h"
#include <IO/WithFileName.h>
namespace DB
{
namespace ErrorCodes
{
extern const int SNAPPY_UNCOMPRESS_FAILED;
}
inline bool HadoopSnappyDecoder::checkBufferLength(int max) const
{
return buffer_length >= 0 && buffer_length < max;
}
inline bool HadoopSnappyDecoder::checkAvailIn(size_t avail_in, int min)
{
return avail_in >= static_cast<size_t>(min);
}
inline void HadoopSnappyDecoder::copyToBuffer(size_t * avail_in, const char ** next_in)
{
assert(*avail_in + buffer_length <= sizeof(buffer));
memcpy(buffer + buffer_length, *next_in, *avail_in);
buffer_length += *avail_in;
*next_in += *avail_in;
*avail_in = 0;
}
inline uint32_t HadoopSnappyDecoder::readLength(const char * in)
{
uint32_t b1 = *(reinterpret_cast<const uint8_t *>(in));
uint32_t b2 = *(reinterpret_cast<const uint8_t *>(in + 1));
uint32_t b3 = *(reinterpret_cast<const uint8_t *>(in + 2));
uint32_t b4 = *(reinterpret_cast<const uint8_t *>(in + 3));
uint32_t res = ((b1 << 24) + (b2 << 16) + (b3 << 8) + b4);
return res;
}
inline HadoopSnappyDecoder::Status HadoopSnappyDecoder::readLength(size_t * avail_in, const char ** next_in, int * length)
{
char tmp[4] = {0};
if (!checkBufferLength(4))
return Status::INVALID_INPUT;
memcpy(tmp, buffer, buffer_length);
if (!checkAvailIn(*avail_in, 4 - buffer_length))
{
copyToBuffer(avail_in, next_in);
return Status::NEEDS_MORE_INPUT;
}
memcpy(tmp + buffer_length, *next_in, 4 - buffer_length);
*avail_in -= 4 - buffer_length;
*next_in += 4 - buffer_length;
buffer_length = 0;
*length = readLength(tmp);
return Status::OK;
}
inline HadoopSnappyDecoder::Status HadoopSnappyDecoder::readBlockLength(size_t * avail_in, const char ** next_in)
{
if (block_length < 0)
{
return readLength(avail_in, next_in, &block_length);
}
return Status::OK;
}
inline HadoopSnappyDecoder::Status HadoopSnappyDecoder::readCompressedLength(size_t * avail_in, const char ** next_in)
{
if (compressed_length < 0)
{
auto status = readLength(avail_in, next_in, &compressed_length);
if (unlikely(compressed_length > 0 && static_cast<size_t>(compressed_length) > sizeof(buffer)))
return Status::TOO_LARGE_COMPRESSED_BLOCK;
return status;
}
return Status::OK;
}
inline HadoopSnappyDecoder::Status
HadoopSnappyDecoder::readCompressedData(size_t * avail_in, const char ** next_in, size_t * avail_out, char ** next_out)
{
if (!checkBufferLength(compressed_length))
return Status::INVALID_INPUT;
if (!checkAvailIn(*avail_in, compressed_length - buffer_length))
{
copyToBuffer(avail_in, next_in);
return Status::NEEDS_MORE_INPUT;
}
const char * compressed = nullptr;
if (buffer_length > 0)
{
compressed = buffer;
memcpy(buffer + buffer_length, *next_in, compressed_length - buffer_length);
}
else
{
compressed = const_cast<char *>(*next_in);
}
size_t uncompressed_length = *avail_out;
auto status = snappy_uncompress(compressed, compressed_length, *next_out, &uncompressed_length);
if (status != SNAPPY_OK)
{
return Status(status);
}
*avail_in -= compressed_length - buffer_length;
*next_in += compressed_length - buffer_length;
*avail_out -= uncompressed_length;
*next_out += uncompressed_length;
total_uncompressed_length += uncompressed_length;
compressed_length = -1;
buffer_length = 0;
return Status::OK;
}
HadoopSnappyDecoder::Status HadoopSnappyDecoder::readBlock(size_t * avail_in, const char ** next_in, size_t * avail_out, char ** next_out)
{
if (*avail_in == 0)
{
if (buffer_length == 0 && block_length < 0 && compressed_length < 0)
return Status::OK;
return Status::NEEDS_MORE_INPUT;
}
HadoopSnappyDecoder::Status status = readBlockLength(avail_in, next_in);
if (status != Status::OK)
return status;
while (total_uncompressed_length < block_length)
{
status = readCompressedLength(avail_in, next_in);
if (status != Status::OK)
return status;
status = readCompressedData(avail_in, next_in, avail_out, next_out);
if (status != Status::OK)
return status;
}
if (total_uncompressed_length != block_length)
{
return Status::INVALID_INPUT;
}
return Status::OK;
}
HadoopSnappyReadBuffer::HadoopSnappyReadBuffer(std::unique_ptr<ReadBuffer> in_, size_t buf_size, char * existing_memory, size_t alignment)
: CompressedReadBufferWrapper(std::move(in_), buf_size, existing_memory, alignment)
, decoder(std::make_unique<HadoopSnappyDecoder>())
, in_available(0)
, in_data(nullptr)
, out_capacity(0)
, out_data(nullptr)
, eof(false)
{
}
HadoopSnappyReadBuffer::~HadoopSnappyReadBuffer() = default;
bool HadoopSnappyReadBuffer::nextImpl()
{
if (eof)
return false;
do
{
if (!in_available)
{
in->nextIfAtEnd();
in_available = in->buffer().end() - in->position();
in_data = in->position();
}
if (decoder->result == Status::NEEDS_MORE_INPUT && (!in_available || in->eof()))
{
throw Exception(
ErrorCodes::SNAPPY_UNCOMPRESS_FAILED,
"hadoop snappy decode error: {}{}",
statusToString(decoder->result),
getExceptionEntryWithFileName(*in));
}
out_capacity = internal_buffer.size();
out_data = internal_buffer.begin();
decoder->result = decoder->readBlock(&in_available, &in_data, &out_capacity, &out_data);
in->position() = in->buffer().end() - in_available;
}
while (decoder->result == Status::NEEDS_MORE_INPUT);
working_buffer.resize(internal_buffer.size() - out_capacity);
if (decoder->result == Status::OK)
{
decoder->reset();
if (in->eof())
{
eof = true;
return !working_buffer.empty();
}
return true;
}
else if (decoder->result != Status::NEEDS_MORE_INPUT)
{
throw Exception(
ErrorCodes::SNAPPY_UNCOMPRESS_FAILED,
"hadoop snappy decode error: {}{}",
statusToString(decoder->result),
getExceptionEntryWithFileName(*in));
}
return true;
}
}
#endif
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