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