tools/perf/util/zstd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <string.h>
   4
   5 #include "util/compress.h"
   6 #include "util/debug.h"
   7
   8 int 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
  16 int 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
  31 ssize_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
  81 size_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 }