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#include "main.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define ZSTD_STATIC_LINKING_ONLY // ZSTD_findDecompressedSize
#include <zstd.h>
static bool extract_default(State *s, const void *src) {
s->store = malloc(s->header->raw_size);
memcpy(s->store, src, s->header->raw_size);
return true;
}
static bool extract_zstd(State *s, const void *src) {
assert(src);
size_t const expected_decom_size = s->header->nr_entries * sizeof(Entry);
size_t const r = ZSTD_findDecompressedSize(src, s->header->raw_size);
if (r == ZSTD_CONTENTSIZE_ERROR)
FATAL("zstd: file was not compressed by zstd.\n");
else if (r == ZSTD_CONTENTSIZE_UNKNOWN)
FATAL(
"zstd: original size unknown. Use streaming decompression instead");
if (r != expected_decom_size) {
WARN("zstd: expected decompressed size: %ld, got: %ld, skipping "
"decompression",
expected_decom_size, r);
return false;
}
s->store = malloc(expected_decom_size);
size_t const actual_decom_size = ZSTD_decompress(
s->store, expected_decom_size, src, s->header->raw_size);
if (actual_decom_size != expected_decom_size) {
FATAL("zstd: error decoding current file: %s \n",
ZSTD_getErrorName(actual_decom_size));
}
return true;
}
static bool extract_lz4(State *s, const void *src) {
// TODO
(void)s;
(void)src;
return true;
}
bool extract(State *s, const void *src) {
switch (s->header->compression_type) {
case COMPRESS_NONE:
DEBUG("extract: extract without compression\n");
return extract_default(s, src);
case COMPRESS_LZ4:
DEBUG("extract: extract with compression algorithm: lz4");
return extract_lz4(s, src);
case COMPRESS_ZSTD:
DEBUG("extract: extract with compression algorithm: zstd");
return extract_zstd(s, src);
// Must not reach here ...
default:
FATAL("Unknown compression option detected");
}
}
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