// SPDX-License-Identifier: GPL-2.0
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#include <string.h>
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#include "util/compress.h"
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#include "util/debug.h"
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int zstd_init(struct zstd_data *data, int level)
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{
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size_t ret;
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data->dstream = ZSTD_createDStream();
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if (data->dstream == NULL) {
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pr_err("Couldn't create decompression stream.\n");
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return -1;
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}
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ret = ZSTD_initDStream(data->dstream);
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if (ZSTD_isError(ret)) {
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pr_err("Failed to initialize decompression stream: %s\n", ZSTD_getErrorName(ret));
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return -1;
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}
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if (!level)
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return 0;
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data->cstream = ZSTD_createCStream();
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if (data->cstream == NULL) {
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pr_err("Couldn't create compression stream.\n");
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return -1;
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}
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ret = ZSTD_initCStream(data->cstream, level);
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if (ZSTD_isError(ret)) {
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pr_err("Failed to initialize compression stream: %s\n", ZSTD_getErrorName(ret));
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return -1;
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}
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return 0;
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}
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int zstd_fini(struct zstd_data *data)
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{
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if (data->dstream) {
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ZSTD_freeDStream(data->dstream);
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data->dstream = NULL;
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}
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if (data->cstream) {
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ZSTD_freeCStream(data->cstream);
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data->cstream = NULL;
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}
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return 0;
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}
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size_t zstd_compress_stream_to_records(struct zstd_data *data, void *dst, size_t dst_size,
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void *src, size_t src_size, size_t max_record_size,
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size_t process_header(void *record, size_t increment))
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{
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size_t ret, size, compressed = 0;
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ZSTD_inBuffer input = { src, src_size, 0 };
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ZSTD_outBuffer output;
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void *record;
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while (input.pos < input.size) {
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record = dst;
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size = process_header(record, 0);
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compressed += size;
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dst += size;
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dst_size -= size;
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output = (ZSTD_outBuffer){ dst, (dst_size > max_record_size) ?
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max_record_size : dst_size, 0 };
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ret = ZSTD_compressStream(data->cstream, &output, &input);
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ZSTD_flushStream(data->cstream, &output);
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if (ZSTD_isError(ret)) {
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pr_err("failed to compress %ld bytes: %s\n",
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(long)src_size, ZSTD_getErrorName(ret));
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memcpy(dst, src, src_size);
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return src_size;
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}
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size = output.pos;
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size = process_header(record, size);
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compressed += size;
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dst += size;
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dst_size -= size;
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}
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return compressed;
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}
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size_t zstd_decompress_stream(struct zstd_data *data, void *src, size_t src_size,
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void *dst, size_t dst_size)
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{
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size_t ret;
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ZSTD_inBuffer input = { src, src_size, 0 };
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ZSTD_outBuffer output = { dst, dst_size, 0 };
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while (input.pos < input.size) {
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ret = ZSTD_decompressStream(data->dstream, &output, &input);
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if (ZSTD_isError(ret)) {
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pr_err("failed to decompress (B): %zd -> %zd, dst_size %zd : %s\n",
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src_size, output.size, dst_size, ZSTD_getErrorName(ret));
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break;
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}
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output.dst = dst + output.pos;
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output.size = dst_size - output.pos;
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}
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return output.pos;
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}
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