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// SPDX-License-Identifier: GPL-3.0-or-later
#include "compression_zstd.h"
#ifdef ENABLE_ZSTD
#include <zstd.h>
void rrdpush_compressor_init_zstd(struct compressor_state *state) {
if(!state->initialized) {
state->initialized = true;
state->stream = ZSTD_createCStream();
if(state->level < 1)
state->level = 1;
if(state->level > ZSTD_maxCLevel())
state->level = ZSTD_maxCLevel();
size_t ret = ZSTD_initCStream(state->stream, state->level);
if(ZSTD_isError(ret))
netdata_log_error("STREAM: ZSTD_initCStream() returned error: %s", ZSTD_getErrorName(ret));
// ZSTD_CCtx_setParameter(state->stream, ZSTD_c_compressionLevel, 1);
// ZSTD_CCtx_setParameter(state->stream, ZSTD_c_strategy, ZSTD_fast);
}
}
void rrdpush_compressor_destroy_zstd(struct compressor_state *state) {
if(state->stream) {
ZSTD_freeCStream(state->stream);
state->stream = NULL;
}
}
size_t rrdpush_compress_zstd(struct compressor_state *state, const char *data, size_t size, const char **out) {
if(unlikely(!state || !size || !out))
return 0;
ZSTD_inBuffer inBuffer = {
.pos = 0,
.size = size,
.src = data,
};
size_t wanted_size = MAX(ZSTD_compressBound(inBuffer.size - inBuffer.pos), ZSTD_CStreamOutSize());
simple_ring_buffer_make_room(&state->output, wanted_size);
ZSTD_outBuffer outBuffer = {
.pos = 0,
.size = state->output.size,
.dst = (void *)state->output.data,
};
// compress
size_t ret = ZSTD_compressStream(state->stream, &outBuffer, &inBuffer);
// error handling
if(ZSTD_isError(ret)) {
netdata_log_error("STREAM: ZSTD_compressStream() return error: %s", ZSTD_getErrorName(ret));
return 0;
}
if(inBuffer.pos < inBuffer.size) {
netdata_log_error("STREAM: ZSTD_compressStream() left unprocessed input (source payload %zu bytes, consumed %zu bytes)",
inBuffer.size, inBuffer.pos);
return 0;
}
if(outBuffer.pos == 0) {
// ZSTD needs more input to flush the output, so let's flush it manually
ret = ZSTD_flushStream(state->stream, &outBuffer);
if(ZSTD_isError(ret)) {
netdata_log_error("STREAM: ZSTD_flushStream() return error: %s", ZSTD_getErrorName(ret));
return 0;
}
if(outBuffer.pos == 0) {
netdata_log_error("STREAM: ZSTD_compressStream() returned zero compressed bytes "
"(source is %zu bytes, output buffer can fit %zu bytes) "
, size, outBuffer.size);
return 0;
}
}
state->sender_locked.total_compressions++;
state->sender_locked.total_uncompressed += size;
state->sender_locked.total_compressed += outBuffer.pos;
// return values
*out = state->output.data;
return outBuffer.pos;
}
void rrdpush_decompressor_init_zstd(struct decompressor_state *state) {
if(!state->initialized) {
state->initialized = true;
state->stream = ZSTD_createDStream();
size_t ret = ZSTD_initDStream(state->stream);
if(ZSTD_isError(ret))
netdata_log_error("STREAM: ZSTD_initDStream() returned error: %s", ZSTD_getErrorName(ret));
simple_ring_buffer_make_room(&state->output, MAX(COMPRESSION_MAX_CHUNK, ZSTD_DStreamOutSize()));
}
}
void rrdpush_decompressor_destroy_zstd(struct decompressor_state *state) {
if (state->stream) {
ZSTD_freeDStream(state->stream);
state->stream = NULL;
}
}
size_t rrdpush_decompress_zstd(struct decompressor_state *state, const char *compressed_data, size_t compressed_size) {
if (unlikely(!state || !compressed_data || !compressed_size))
return 0;
// The state.output ring buffer is always EMPTY at this point,
// meaning that (state->output.read_pos == state->output.write_pos)
// However, THEY ARE NOT ZERO.
ZSTD_inBuffer inBuffer = {
.pos = 0,
.size = compressed_size,
.src = compressed_data,
};
ZSTD_outBuffer outBuffer = {
.pos = 0,
.dst = (char *)state->output.data,
.size = state->output.size,
};
size_t ret = ZSTD_decompressStream(
state->stream
, &outBuffer
, &inBuffer);
if(ZSTD_isError(ret)) {
netdata_log_error("STREAM: ZSTD_decompressStream() return error: %s", ZSTD_getErrorName(ret));
return 0;
}
if(inBuffer.pos < inBuffer.size)
fatal("RRDPUSH DECOMPRESS: ZSTD ZSTD_decompressStream() decompressed %zu bytes, "
"but %zu bytes of compressed data remain",
inBuffer.pos, inBuffer.size);
size_t decompressed_size = outBuffer.pos;
state->output.read_pos = 0;
state->output.write_pos = outBuffer.pos;
// statistics
state->total_compressed += compressed_size;
state->total_uncompressed += decompressed_size;
state->total_compressions++;
return decompressed_size;
}
#endif // ENABLE_ZSTD
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