115 lines · c
1// SPDX-License-Identifier: GPL-2.02 3#include <string.h>4 5#include "util/compress.h"6#include "util/debug.h"7 8int zstd_init(struct zstd_data *data, int level)9{10 data->comp_level = level;11 data->dstream = NULL;12 data->cstream = NULL;13 return 0;14}15 16int zstd_fini(struct zstd_data *data)17{18 if (data->dstream) {19 ZSTD_freeDStream(data->dstream);20 data->dstream = NULL;21 }22 23 if (data->cstream) {24 ZSTD_freeCStream(data->cstream);25 data->cstream = NULL;26 }27 28 return 0;29}30 31ssize_t zstd_compress_stream_to_records(struct zstd_data *data, void *dst, size_t dst_size,32 void *src, size_t src_size, size_t max_record_size,33 size_t process_header(void *record, size_t increment))34{35 size_t ret, size, compressed = 0;36 ZSTD_inBuffer input = { src, src_size, 0 };37 ZSTD_outBuffer output;38 void *record;39 40 if (!data->cstream) {41 data->cstream = ZSTD_createCStream();42 if (data->cstream == NULL) {43 pr_err("Couldn't create compression stream.\n");44 return -1;45 }46 47 ret = ZSTD_initCStream(data->cstream, data->comp_level);48 if (ZSTD_isError(ret)) {49 pr_err("Failed to initialize compression stream: %s\n",50 ZSTD_getErrorName(ret));51 return -1;52 }53 }54 55 while (input.pos < input.size) {56 record = dst;57 size = process_header(record, 0);58 compressed += size;59 dst += size;60 dst_size -= size;61 output = (ZSTD_outBuffer){ dst, (dst_size > max_record_size) ?62 max_record_size : dst_size, 0 };63 ret = ZSTD_compressStream(data->cstream, &output, &input);64 ZSTD_flushStream(data->cstream, &output);65 if (ZSTD_isError(ret)) {66 pr_err("failed to compress %ld bytes: %s\n",67 (long)src_size, ZSTD_getErrorName(ret));68 memcpy(dst, src, src_size);69 return src_size;70 }71 size = output.pos;72 size = process_header(record, size);73 compressed += size;74 dst += size;75 dst_size -= size;76 }77 78 return compressed;79}80 81size_t zstd_decompress_stream(struct zstd_data *data, void *src, size_t src_size,82 void *dst, size_t dst_size)83{84 size_t ret;85 ZSTD_inBuffer input = { src, src_size, 0 };86 ZSTD_outBuffer output = { dst, dst_size, 0 };87 88 if (!data->dstream) {89 data->dstream = ZSTD_createDStream();90 if (data->dstream == NULL) {91 pr_err("Couldn't create decompression stream.\n");92 return 0;93 }94 95 ret = ZSTD_initDStream(data->dstream);96 if (ZSTD_isError(ret)) {97 pr_err("Failed to initialize decompression stream: %s\n",98 ZSTD_getErrorName(ret));99 return 0;100 }101 }102 while (input.pos < input.size) {103 ret = ZSTD_decompressStream(data->dstream, &output, &input);104 if (ZSTD_isError(ret)) {105 pr_err("failed to decompress (B): %zd -> %zd, dst_size %zd : %s\n",106 src_size, output.size, dst_size, ZSTD_getErrorName(ret));107 break;108 }109 output.dst = dst + output.pos;110 output.size = dst_size - output.pos;111 }112 113 return output.pos;114}115