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/*
* librdkafka - The Apache Kafka C/C++ library
*
* Copyright (c) 2018 Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "rdkafka_int.h"
#include "rdkafka_zstd.h"
#if WITH_ZSTD_STATIC
/* Enable advanced/unstable API for initCStream_srcSize */
#define ZSTD_STATIC_LINKING_ONLY
#endif
#include <zstd.h>
#include <zstd_errors.h>
rd_kafka_resp_err_t rd_kafka_zstd_decompress(rd_kafka_broker_t *rkb,
char *inbuf,
size_t inlen,
void **outbuf,
size_t *outlenp) {
unsigned long long out_bufsize = ZSTD_getFrameContentSize(inbuf, inlen);
switch (out_bufsize) {
case ZSTD_CONTENTSIZE_UNKNOWN:
/* Decompressed size cannot be determined, make a guess */
out_bufsize = inlen * 2;
break;
case ZSTD_CONTENTSIZE_ERROR:
/* Error calculating frame content size */
rd_rkb_dbg(rkb, MSG, "ZSTD",
"Unable to begin ZSTD decompression "
"(out buffer is %llu bytes): %s",
out_bufsize, "Error in determining frame size");
return RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
default:
break;
}
/* Increase output buffer until it can fit the entire result,
* capped by message.max.bytes */
while (out_bufsize <=
(unsigned long long)rkb->rkb_rk->rk_conf.recv_max_msg_size) {
size_t ret;
char *decompressed;
decompressed = rd_malloc((size_t)out_bufsize);
if (!decompressed) {
rd_rkb_dbg(rkb, MSG, "ZSTD",
"Unable to allocate output buffer "
"(%llu bytes for %" PRIusz
" compressed bytes): %s",
out_bufsize, inlen, rd_strerror(errno));
return RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE;
}
ret = ZSTD_decompress(decompressed, (size_t)out_bufsize, inbuf,
inlen);
if (!ZSTD_isError(ret)) {
*outlenp = ret;
*outbuf = decompressed;
return RD_KAFKA_RESP_ERR_NO_ERROR;
}
rd_free(decompressed);
/* Check if the destination size is too small */
if (ZSTD_getErrorCode(ret) == ZSTD_error_dstSize_tooSmall) {
/* Grow quadratically */
out_bufsize += RD_MAX(out_bufsize * 2, 4000);
rd_atomic64_add(&rkb->rkb_c.zbuf_grow, 1);
} else {
/* Fail on any other error */
rd_rkb_dbg(rkb, MSG, "ZSTD",
"Unable to begin ZSTD decompression "
"(out buffer is %llu bytes): %s",
out_bufsize, ZSTD_getErrorName(ret));
return RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
}
}
rd_rkb_dbg(rkb, MSG, "ZSTD",
"Unable to decompress ZSTD "
"(input buffer %" PRIusz
", output buffer %llu): "
"output would exceed message.max.bytes (%d)",
inlen, out_bufsize, rkb->rkb_rk->rk_conf.max_msg_size);
return RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
}
rd_kafka_resp_err_t rd_kafka_zstd_compress(rd_kafka_broker_t *rkb,
int comp_level,
rd_slice_t *slice,
void **outbuf,
size_t *outlenp) {
ZSTD_CStream *cctx;
size_t r;
rd_kafka_resp_err_t err = RD_KAFKA_RESP_ERR_NO_ERROR;
size_t len = rd_slice_remains(slice);
ZSTD_outBuffer out;
ZSTD_inBuffer in;
*outbuf = NULL;
out.pos = 0;
out.size = ZSTD_compressBound(len);
out.dst = rd_malloc(out.size);
if (!out.dst) {
rd_rkb_dbg(rkb, MSG, "ZSTDCOMPR",
"Unable to allocate output buffer "
"(%" PRIusz " bytes): %s",
out.size, rd_strerror(errno));
return RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE;
}
cctx = ZSTD_createCStream();
if (!cctx) {
rd_rkb_dbg(rkb, MSG, "ZSTDCOMPR",
"Unable to create ZSTD compression context");
err = RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE;
goto done;
}
#if defined(WITH_ZSTD_STATIC) && \
ZSTD_VERSION_NUMBER >= (1 * 100 * 100 + 2 * 100 + 1) /* v1.2.1 */
r = ZSTD_initCStream_srcSize(cctx, comp_level, len);
#else
/* libzstd not linked statically (or zstd version < 1.2.1):
* decompression in consumer may be more costly due to
* decompressed size not included in header by librdkafka producer */
r = ZSTD_initCStream(cctx, comp_level);
#endif
if (ZSTD_isError(r)) {
rd_rkb_dbg(rkb, MSG, "ZSTDCOMPR",
"Unable to begin ZSTD compression "
"(out buffer is %" PRIusz " bytes): %s",
out.size, ZSTD_getErrorName(r));
err = RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
goto done;
}
while ((in.size = rd_slice_reader(slice, &in.src))) {
in.pos = 0;
r = ZSTD_compressStream(cctx, &out, &in);
if (unlikely(ZSTD_isError(r))) {
rd_rkb_dbg(rkb, MSG, "ZSTDCOMPR",
"ZSTD compression failed "
"(at of %" PRIusz
" bytes, with "
"%" PRIusz
" bytes remaining in out buffer): "
"%s",
in.size, out.size - out.pos,
ZSTD_getErrorName(r));
err = RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
goto done;
}
/* No space left in output buffer,
* but input isn't fully consumed */
if (in.pos < in.size) {
err = RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
goto done;
}
}
if (rd_slice_remains(slice) != 0) {
rd_rkb_dbg(rkb, MSG, "ZSTDCOMPR",
"Failed to finalize ZSTD compression "
"of %" PRIusz " bytes: %s",
len, "Unexpected trailing data");
err = RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
goto done;
}
r = ZSTD_endStream(cctx, &out);
if (unlikely(ZSTD_isError(r) || r > 0)) {
rd_rkb_dbg(rkb, MSG, "ZSTDCOMPR",
"Failed to finalize ZSTD compression "
"of %" PRIusz " bytes: %s",
len, ZSTD_getErrorName(r));
err = RD_KAFKA_RESP_ERR__BAD_COMPRESSION;
goto done;
}
*outbuf = out.dst;
*outlenp = out.pos;
done:
if (cctx)
ZSTD_freeCStream(cctx);
if (err)
rd_free(out.dst);
return err;
}
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