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Add ZSTD max window size limit #5

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Add ZSTD max window size limit #5

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8 changes: 8 additions & 0 deletions src/common/zpq_stream.c
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,12 @@ struct ZpqStream
#include <zstd.h>

#define ZSTD_BUFFER_SIZE (8*1024)
/*
* Maximum allowed back-reference distance, expressed as power of 2.
* This setting controls max compressor/decompressor window size.
* More details https://github.com/facebook/zstd/blob/v1.4.7/lib/zstd.h#L536
*/
#define ZSTD_WINDOWLOG_LIMIT 23 /* set max window size to 8MB */

typedef struct ZstdStream
{
Expand Down Expand Up @@ -100,8 +106,10 @@ zstd_create(int level, zpq_tx_func tx_func, zpq_rx_func rx_func, void *arg, char

zs->tx_stream = ZSTD_createCStream();
ZSTD_initCStream(zs->tx_stream, level);
ZSTD_CCtx_setParameter(zs->tx_stream, ZSTD_c_windowLog, ZSTD_WINDOWLOG_LIMIT);
zs->rx_stream = ZSTD_createDStream();
ZSTD_initDStream(zs->rx_stream);
ZSTD_DCtx_setParameter(zs->rx_stream, ZSTD_d_windowLogMax, ZSTD_WINDOWLOG_LIMIT);
zs->tx.dst = zs->tx_buf;
zs->tx.pos = 0;
zs->tx.size = ZSTD_BUFFER_SIZE;
Expand Down