Ejemplo n.º 1
0
    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);
}