root/tools/perf/util/zstd.c

DEFINITIONS

1. zstd_init
2. zstd_fini
3. zstd_compress_stream_to_records
4. zstd_decompress_stream

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