aboutsummaryrefslogtreecommitdiff
path: root/lib/comp/lz4.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/comp/lz4.c')
-rw-r--r--lib/comp/lz4.c159
1 files changed, 0 insertions, 159 deletions
diff --git a/lib/comp/lz4.c b/lib/comp/lz4.c
deleted file mode 100644
index abb6c5c..0000000
--- a/lib/comp/lz4.c
+++ /dev/null
@@ -1,159 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * lz4.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 <lz4.h>
-#include <lz4hc.h>
-
-#include "internal.h"
-
-typedef struct {
- compressor_t base;
- bool high_compression;
-} lz4_compressor_t;
-
-typedef struct {
- uint32_t version;
- uint32_t flags;
-} lz4_options;
-
-#define LZ4LEGACY 1
-#define LZ4_FLAG_HC 0x01
-
-static int lz4_write_options(compressor_t *base, int fd)
-{
- lz4_compressor_t *lz4 = (lz4_compressor_t *)base;
- lz4_options opt = {
- .version = htole32(LZ4LEGACY),
- .flags = htole32(lz4->high_compression ? LZ4_FLAG_HC : 0),
- };
-
- return generic_write_options(fd, &opt, sizeof(opt));
-}
-
-static int lz4_read_options(compressor_t *base, int fd)
-{
- lz4_options opt;
- (void)base;
-
- if (generic_read_options(fd, &opt, sizeof(opt)))
- return -1;
-
- opt.version = le32toh(opt.version);
- opt.flags = le32toh(opt.flags);
-
- if (opt.version != LZ4LEGACY) {
- fprintf(stderr, "unsupported lz4 version '%d'\n", opt.version);
- return -1;
- }
-
- return 0;
-}
-
-static ssize_t lz4_comp_block(compressor_t *base, const uint8_t *in,
- size_t size, uint8_t *out, size_t outsize)
-{
- lz4_compressor_t *lz4 = (lz4_compressor_t *)base;
- int ret;
-
- if (lz4->high_compression) {
- ret = LZ4_compress_HC((void *)in, (void *)out,
- size, outsize, LZ4HC_CLEVEL_MAX);
- } else {
- ret = LZ4_compress_default((void *)in, (void *)out,
- size, outsize);
- }
-
- if (ret < 0) {
- fputs("internal error in lz4 compressor\n", stderr);
- return -1;
- }
-
- return ret;
-}
-
-static ssize_t lz4_uncomp_block(compressor_t *base, const uint8_t *in,
- size_t size, uint8_t *out, size_t outsize)
-{
- int ret;
- (void)base;
-
- ret = LZ4_decompress_safe((void *)in, (void *)out, size, outsize);
-
- if (ret < 0) {
- fputs("internal error in lz4 decompressor\n", stderr);
- return -1;
- }
-
- return ret;
-}
-
-static compressor_t *lz4_create_copy(compressor_t *cmp)
-{
- lz4_compressor_t *lz4 = malloc(sizeof(*lz4));
-
- if (lz4 == NULL) {
- perror("creating additional lz4 compressor");
- return NULL;
- }
-
- memcpy(lz4, cmp, sizeof(*lz4));
- return (compressor_t *)lz4;
-}
-
-static void lz4_destroy(compressor_t *base)
-{
- free(base);
-}
-
-compressor_t *create_lz4_compressor(bool compress, size_t block_size,
- char *options)
-{
- lz4_compressor_t *lz4 = calloc(1, sizeof(*lz4));
- compressor_t *base = (compressor_t *)lz4;
- (void)block_size;
-
- if (lz4 == NULL) {
- perror("creating lz4 compressor");
- return NULL;
- }
-
- lz4->high_compression = false;
-
- if (options != NULL) {
- if (strcmp(options, "hc") == 0) {
- lz4->high_compression = true;
- } else {
- fputs("Unsupported extra options for lz4 "
- "compressor.\n", stderr);
- free(lz4);
- return NULL;
- }
- }
-
- base->destroy = lz4_destroy;
- base->do_block = compress ? lz4_comp_block : lz4_uncomp_block;
- base->write_options = lz4_write_options;
- base->read_options = lz4_read_options;
- base->create_copy = lz4_create_copy;
- return base;
-}
-
-void compressor_lz4_print_help(void)
-{
- fputs("Available options for lz4 compressor:\n"
- "\n"
- " hc If present, use slower but better compressing\n"
- " variant of lz4.\n"
- "\n",
- stdout);
-}