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Code Issues Releases Wiki Activity

Read offset (seek) support

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This commit is contained in:
Davide Berardi 2024-02-19 11:19:42 +01:00
parent b292926d43
commit f524a05782
1 changed files with 19 additions and 4 deletions
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23
snappy-fox.c
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@ -49,6 +49,8 @@ static uint32_t unframed_stream = 0;
static uint32_t ignore_offset_errors = 0;
/* Byte to substitute offset corrupted values with */
static uint8_t offset_dummy_byte = 0xff;
/* Read offset */
static uint32_t read_offset = 0;
/* Logarithm base two of the number */
static uint32_t log2_32(uint32_t n) {
@ -288,6 +290,13 @@ static FILE *open_read_file(const char *file) {
if (strcmp(file, "-") != 0)
in = fopen(file, "rb");
prdebug("Opening IN file: %s\n", file);
if (in == NULL)
return in;
if (read_offset != 0) {
prinfo("Seeking to offset %d\n", read_offset);
fseek(in, read_offset, SEEK_SET);
}
return in;
}
@ -520,9 +529,10 @@ static void usage(const char *progname) {
fprintf(stderr, " files can be specified as - for stdin or stdout\n");
fprintf(stderr, " Options:\n");
fprintf(stderr, " -E --ignore_offset_errors [substitution byte] Ignore any offset errors that occurs\n");
fprintf(stderr, " -u --unframed Assume Unframed stream in input file\n");
fprintf(stderr, " -h --help This Help\n");
fprintf(stderr, " -v --version Print Version and exit\n");
fprintf(stderr, " -O --read_offset [offset] Start reading file from offset\n");
fprintf(stderr, " -u --unframed Assume Unframed stream in input file\n");
fprintf(stderr, " -h --help This Help\n");
fprintf(stderr, " -v --version Print Version and exit\n");
}
int main(int argc, char **argv) {
@ -533,6 +543,7 @@ int main(int argc, char **argv) {
int option_idx = 0;
static struct option flags[] = {
{"ignore_offset_errors", optional_argument, 0, 'E'},
{"read_offset", required_argument, 0, 'O'},
{"unframed", no_argument, 0, 'u'},
{"version", no_argument, 0, 'v'},
{"help", no_argument, 0, 'h'},
@ -540,7 +551,7 @@ int main(int argc, char **argv) {
};
while (c != -1) {
c = getopt_long(argc, argv, "E?uhv", flags, &option_idx);
c = getopt_long(argc, argv, "O:E::uhv", flags, &option_idx);
switch (c) {
case 'E':
ignore_offset_errors = 1;
@ -548,6 +559,10 @@ int main(int argc, char **argv) {
if (optarg != NULL)
offset_dummy_byte = (strtol(optarg, NULL, 0) & 0xff);
break;
case 'O':
if (optarg != NULL)
read_offset = strtol(optarg, NULL, 0);
break;
case 'u':
unframed_stream = 1;
break;