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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-31 16:22:31 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-31 16:22:31 +0200
commit9b3d958fb7c37855a63ed75707281c61dc1d44c4 (patch)
tree053c117a09a7eb83b2d17dc582668979cf344102 /lib/comp/zstd.c
parentf7801346c0913032e99105088b962a986edb24f4 (diff)
Merge libcompress.a into libsquashfs.a
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/comp/zstd.c')
-rw-r--r--lib/comp/zstd.c188
1 files changed, 0 insertions, 188 deletions
diff --git a/lib/comp/zstd.c b/lib/comp/zstd.c
deleted file mode 100644
index e206338..0000000
--- a/lib/comp/zstd.c
+++ /dev/null
@@ -1,188 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * zstd.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <ctype.h>
-
-#include <zstd.h>
-
-#include "internal.h"
-
-#define ZSTD_DEFAULT_COMPRESSION_LEVEL 15
-
-typedef struct {
- compressor_t base;
- ZSTD_CCtx *zctx;
- int level;
-} zstd_compressor_t;
-
-typedef struct {
- uint32_t level;
-} zstd_options_t;
-
-static int zstd_write_options(compressor_t *base, int fd)
-{
- zstd_compressor_t *zstd = (zstd_compressor_t *)base;
- zstd_options_t opt;
- (void)fd;
-
- if (zstd->level == ZSTD_DEFAULT_COMPRESSION_LEVEL)
- return 0;
-
- opt.level = htole32(zstd->level);
- return generic_write_options(fd, &opt, sizeof(opt));
-}
-
-static int zstd_read_options(compressor_t *base, int fd)
-{
- zstd_options_t opt;
- (void)base;
-
- if (generic_read_options(fd, &opt, sizeof(opt)))
- return -1;
-
- opt.level = le32toh(opt.level);
- return 0;
-}
-
-static ssize_t zstd_comp_block(compressor_t *base, const uint8_t *in,
- size_t size, uint8_t *out, size_t outsize)
-{
- zstd_compressor_t *zstd = (zstd_compressor_t *)base;
- size_t ret;
-
- ret = ZSTD_compressCCtx(zstd->zctx, out, outsize, in, size,
- zstd->level);
-
- if (ZSTD_isError(ret)) {
- fprintf(stderr, "internal error in ZSTD compressor: %s\n",
- ZSTD_getErrorName(ret));
- return -1;
- }
-
- return ret < size ? ret : 0;
-}
-
-static ssize_t zstd_uncomp_block(compressor_t *base, const uint8_t *in,
- size_t size, uint8_t *out, size_t outsize)
-{
- size_t ret;
- (void)base;
-
- ret = ZSTD_decompress(out, outsize, in, size);
-
- if (ZSTD_isError(ret)) {
- fprintf(stderr, "error uncompressing ZSTD compressed data: %s",
- ZSTD_getErrorName(ret));
- return -1;
- }
-
- return ret;
-}
-
-static compressor_t *zstd_create_copy(compressor_t *cmp)
-{
- zstd_compressor_t *zstd = malloc(sizeof(*zstd));
-
- if (zstd == NULL) {
- perror("creating additional zstd compressor");
- return NULL;
- }
-
- memcpy(zstd, cmp, sizeof(*zstd));
-
- zstd->zctx = ZSTD_createCCtx();
-
- if (zstd->zctx == NULL) {
- fputs("error creating addtional zstd compression context\n",
- stderr);
- free(zstd);
- return NULL;
- }
-
- return (compressor_t *)zstd;
-}
-
-static void zstd_destroy(compressor_t *base)
-{
- zstd_compressor_t *zstd = (zstd_compressor_t *)base;
-
- ZSTD_freeCCtx(zstd->zctx);
- free(zstd);
-}
-
-compressor_t *create_zstd_compressor(bool compress, size_t block_size,
- char *options)
-{
- zstd_compressor_t *zstd = calloc(1, sizeof(*zstd));
- compressor_t *base = (compressor_t *)zstd;
- size_t i;
- (void)block_size;
-
- if (zstd == NULL) {
- perror("creating zstd compressor");
- return NULL;
- }
-
- zstd->level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
-
- if (options != NULL) {
- if (strncmp(options, "level=", 6) == 0) {
- options += 6;
-
- for (i = 0; isdigit(options[i]); ++i)
- ;
-
- if (i == 0 || options[i] != '\0' || i > 6)
- goto fail_level;
-
- zstd->level = atoi(options);
-
- if (zstd->level < 1 || zstd->level > ZSTD_maxCLevel())
- goto fail_level;
- } else {
- goto fail_opt;
- }
- }
-
- zstd->zctx = ZSTD_createCCtx();
- if (zstd->zctx == NULL) {
- fputs("error creating zstd compression context\n", stderr);
- free(zstd);
- return NULL;
- }
-
- base->destroy = zstd_destroy;
- base->do_block = compress ? zstd_comp_block : zstd_uncomp_block;
- base->write_options = zstd_write_options;
- base->read_options = zstd_read_options;
- base->create_copy = zstd_create_copy;
- return base;
-fail_level:
- fprintf(stderr, "zstd compression level must be a number in the range "
- "1...%d\n", ZSTD_maxCLevel());
- free(zstd);
- return NULL;
-fail_opt:
- fputs("Unsupported extra options for zstd compressor\n", stderr);
- free(zstd);
- return NULL;
-}
-
-void compressor_zstd_print_help(void)
-{
- printf("Available options for zstd compressor:\n"
- "\n"
- " level=<value> Set compression level. Defaults to %d.\n"
- " Maximum is %d.\n"
- "\n",
- ZSTD_DEFAULT_COMPRESSION_LEVEL, ZSTD_maxCLevel());
-}