-/*
-unzstd -- .warc.zst decompressor
-Copyright (C) 2021-2022 Sergey Matveev <stargrave@stargrave.org>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, version 3 of the License.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
+// unzstd -- .warc.zst decompressor
+// Copyright (C) 2021-2024 Sergey Matveev <stargrave@stargrave.org>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
// https://iipc.github.io/warc-specifications/specifications/warc-zstd/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/endian.h>
#include <zstd.h>
#include <sysexits.h>
#endif // __FreeBSD__
+static uint32_t
+le32dec(const char buf[4])
+{
+ return (uint32_t)(buf[3]) << 24 | (uint32_t)(buf[2]) << 16 |
+ (uint32_t)(buf[1]) << 8 | (uint32_t)(buf[0]);
+}
+
int
main(int argc, char **argv)
{
fputs("can not initialize ZSTD_DCtx\n", stderr);
return 1;
}
- int rc = EXIT_FAILURE;
- char *bufIn = NULL;
- char *bufOut = NULL;
+ int rc = EXIT_FAILURE;
+ char *bufIn = NULL;
+ char *bufOut = NULL;
const size_t bufInSize = ZSTD_DStreamInSize();
- bufIn = malloc(bufInSize);
+ bufIn = malloc(bufInSize);
if (bufIn == NULL) {
fputs("no memory\n", stderr);
goto Exit;
}
const size_t bufOutSize = ZSTD_DStreamOutSize();
- bufOut = malloc(bufOutSize);
+ bufOut = malloc(bufOutSize);
if (bufOut == NULL) {
fputs("no memory\n", stderr);
goto Exit;
unsigned long long bufSize = 0;
- ZSTD_inBuffer bIn = {bufIn, 0, 0};
+ ZSTD_inBuffer bIn = {bufIn, 0, 0};
ZSTD_outBuffer bOut = {bufOut, 0, 0};
- bool isEmpty = true;
- bool lastBlock = false;
- size_t n = 0;
- size_t written = 0;
- size_t offset = 0;
+ bool isEmpty = true;
+ bool lastBlock = false;
+ size_t n = 0;
+ size_t written = 0;
+ size_t offset = 0;
size_t offsetPrev = 0;
- size_t zCode = 0;
+ size_t zCode = 0;
ReadAgain:
for (;;) {
n = fread(bufIn, 1, bufInSize, stdin);
if (n >= 8 && le32dec(bufIn) == 0x184D2A5D) {
// dictionary frame
size_t dictSize = (size_t)le32dec(bufIn + 4);
- char *dict = malloc(dictSize);
+ char *dict = malloc(dictSize);
if (dict == NULL) {
fprintf(stderr, "insufficient memory for dictionary: %zu\n", dictSize);
goto Exit;
const size_t alreadyRead = n - 8;
memcpy(dict, bufIn + 8, alreadyRead);
errno = 0;
- n = fread(dict + alreadyRead, 1, dictSize - alreadyRead, stdin);
+ n = fread(dict + alreadyRead, 1, dictSize - alreadyRead, stdin);
if (n != dictSize - alreadyRead) {
perror("can not read dictionary data");
free(dict);
goto Exit;
}
- offset = dictSize + 8;
+ offset = dictSize + 8;
offsetPrev = offset;
if (fdOff != NULL) {
fprintf(fdOff, "%zu\t0\n", offset);
goto Exit;
}
}
- isEmpty = false;
+ isEmpty = false;
bIn.size = n;
- bIn.pos = 0;
+ bIn.pos = 0;
while (bIn.pos < bIn.size) {
bOut.size = bufOutSize;
- bOut.pos = 0;
- zCode = ZSTD_decompressStream(ctx, &bOut, &bIn);
+ bOut.pos = 0;
+ zCode = ZSTD_decompressStream(ctx, &bOut, &bIn);
if ((zCode != 0) && (ZSTD_isError(zCode))) {
fprintf(stderr, "can not decompress: %s\n", ZSTD_getErrorName(zCode));
goto Exit;
fprintf(fdOff, "%zu\t%zu\n", offset - offsetPrev, written);
}
offsetPrev = offset + bIn.pos;
- written = 0;
+ written = 0;
}
}
if (lastBlock) {