FileRead( FILE* f )
: m_stream( LZ4_createStreamDecode() )
, m_file( f )
, m_buf( m_bufData[1] )
, m_second( m_bufData[0] )
, m_offset( 0 )
, m_lastBlock( 0 )
, m_signalSwitch( false )
, m_signalAvailable( false )
, m_exit( false )
{
char hdr[4];
if( fread( hdr, 1, sizeof( hdr ), m_file ) != sizeof( hdr ) ) throw NotTracyDump();
if( memcmp( hdr, Lz4Header, sizeof( hdr ) ) != 0 )
{
fseek( m_file, 0, SEEK_SET );
uint32_t sz;
static_assert( sizeof( sz ) == sizeof( hdr ), "Size mismatch" );
memcpy( &sz, hdr, sizeof( sz ) );
if( sz > LZ4Size ) throw NotTracyDump();
}
ReadBlock();
std::swap( m_buf, m_second );
m_decThread = std::thread( [this] { Worker(); } );
}
static void test_decompress(
FILE* outFp,
FILE* inpFp,
size_t messageMaxBytes,
size_t ringBufferBytes)
{
LZ4_streamDecode_t* const lz4StreamDecode = LZ4_createStreamDecode();
char* const cmpBuf = (char*) malloc(LZ4_COMPRESSBOUND(messageMaxBytes));
char* const decBuf = (char*) malloc(ringBufferBytes);
int decOffset = 0;
for ( ; ; )
{
uint16_t cmpBytes = 0;
if (read_uint16(inpFp, &cmpBytes) != 1) break;
if (cmpBytes <= 0) break;
if (read_bin(inpFp, cmpBuf, cmpBytes) != cmpBytes) break;
{
char* const decPtr = &decBuf[decOffset];
const int decBytes = LZ4_decompress_safe_continue(
lz4StreamDecode, cmpBuf, decPtr, cmpBytes, (int) messageMaxBytes);
if (decBytes <= 0) break;
write_bin(outFp, decPtr, decBytes);
// Add and wraparound the ringbuffer offset
decOffset += decBytes;
if ((size_t)decOffset >= ringBufferBytes - messageMaxBytes) decOffset = 0;
}
}
free(decBuf);
free(cmpBuf);
LZ4_freeStreamDecode(lz4StreamDecode);
}