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#include "extract.h"
#include <errno.h>
#include <string.h>
#include <time.h>
#define ZSTD_STATIC_LINKING_ONLY // ZSTD_findDecompressedSize
#include <zstd.h>
static int nfl_extract_default(FILE *f, nfl_state_t *state);
static int nfl_extract_zstd(FILE *f, nfl_state_t *state);
static int nfl_extract_lz4(FILE *f, nfl_state_t *state);
static int nfl_verify_header(nfl_header_t *header) {
if (header->cksum != nfl_header_cksum(header)) {
debug("Header checksum mismatch: expected: 0x%x, got: 0x%x",
header->cksum, nfl_header_cksum(header));
return -1;
}
if (header->id > MAX_TRUNK_ID)
return -1;
if (header->max_n_entries < header->n_entries)
return -1;
time_t now = time(NULL);
if ((time_t)header->start_time >= now || (time_t)header->end_time >= now ||
header->start_time > header->end_time)
return -1;
return 0;
}
static int nfl_extract_default(FILE *f, nfl_state_t *state) {
int entries =
fread(state->store, sizeof(nfl_entry_t), state->header->n_entries, f);
WARN_RETURN(ferror(f), "%s", strerror(errno));
return entries;
}
static int nfl_extract_zstd(FILE *f, nfl_state_t *state) {
char *buf;
size_t const compressed_size = nfl_get_filesize(f) - sizeof(nfl_header_t),
expected_decom_size =
state->header->n_entries * sizeof(nfl_entry_t);
// It's possible that data or header is not written due to broken commit
WARN_RETURN(compressed_size <= 0, "%s", "zstd: no data in this trunk");
WARN_RETURN(!(buf = malloc(compressed_size)), "zstd: cannot malloc");
WARN_RETURN(!fread(buf, compressed_size, 1, f), "zstd: broken data section");
WARN_RETURN(ferror(f), "%s", strerror(errno));
size_t const estimate_decom_size =
ZSTD_findDecompressedSize(buf, compressed_size);
if (estimate_decom_size == ZSTD_CONTENTSIZE_ERROR)
FATAL("zstd: file was not compressed by zstd.\n");
else if (estimate_decom_size == ZSTD_CONTENTSIZE_UNKNOWN)
FATAL(
"zstd: original size unknown. Use streaming decompression instead");
size_t const actual_decom_size = ZSTD_decompress(
state->store, expected_decom_size, buf, compressed_size);
if (actual_decom_size != expected_decom_size) {
FATAL("zstd: error decoding current file: %s \n",
ZSTD_getErrorName(actual_decom_size));
}
free(buf);
return actual_decom_size / sizeof(nfl_entry_t);
}
static int nfl_extract_lz4(FILE *f, nfl_state_t *state) {
/* TODO */
return 0;
}
int nfl_extract_worker(const char *filename, nfl_state_t *state) {
FILE *f;
int got = 0, ret = 0;
nfl_header_t *h;
debug("Extracting from file %s", filename);
ERR((f = fopen(filename, "rb")) == NULL, "extract worker");
ERR(nfl_check_file(f) < 0, "extract worker");
// Read header
ERR(!(state->header = malloc(sizeof(nfl_header_t))),
"extract malloc header");
got = fread(state->header, sizeof(nfl_header_t), 1, f);
h = state->header;
// Check header validity
WARN_RETURN(ferror(f), "%s", strerror(errno));
WARN_RETURN(got == 0 || nfl_verify_header(h) < 0,
"File %s has corrupted header.", filename);
// Read body
ERR(!(state->store = malloc(sizeof(nfl_entry_t) * h->n_entries)),
"extract malloc store");
switch (h->compression_opt) {
case COMPRESS_NONE:
debug("Extract worker #%u: extract without compression\n", h->id);
ret = nfl_extract_default(f, state);
break;
case COMPRESS_LZ4:
debug("Extract worker #%u: extract with compression algorithm: lz4",
h->id);
ret = nfl_extract_lz4(f, state);
break;
case COMPRESS_ZSTD:
debug("Extract worker #%u: extract with compression algorithm: zstd",
h->id);
ret = nfl_extract_zstd(f, state);
break;
// Must not reach here ...
default:
FATAL("Unknown compression option detected");
}
fclose(f);
return ret;
}
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