128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
|
|
* This file is part of ToaruOS and is released under the terms
|
|
* of the NCSA / University of Illinois License - see LICENSE.md
|
|
* Copyright (C) 2020 K. Lange
|
|
*
|
|
* gunzip - decompress gzip-compressed payloads
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
#include <toaru/inflate.h>
|
|
|
|
static int to_stdout = 0;
|
|
static int keep = 0;
|
|
static int progress = 0;
|
|
static off_t total_length = 0;
|
|
static size_t count = 0;
|
|
|
|
static uint8_t _get(struct inflate_context * ctx) {
|
|
return fgetc(ctx->input_priv);
|
|
}
|
|
|
|
static uint8_t _get_progress(struct inflate_context * ctx) {
|
|
count++;
|
|
if (!(count & 0x3FF)) {
|
|
fprintf(stderr, "\r%zu KiB / %zu KiB (%zu%%)", count / 1024, total_length / 1024, 100 * count / total_length);
|
|
fflush(stderr);
|
|
}
|
|
return fgetc(ctx->input_priv);
|
|
}
|
|
|
|
static void _write(struct inflate_context * ctx, unsigned int sym) {
|
|
fputc(sym, ctx->output_priv);
|
|
}
|
|
|
|
static int usage(int argc, char * argv[]) {
|
|
fprintf(stderr,
|
|
"gunzip - decompress gzip-compressed payloads\n"
|
|
"\n"
|
|
"usage: %s [-c] name...\n"
|
|
"\n"
|
|
" -c \033[3mwrite to stdout; implies -k\033[0m\n"
|
|
" -k \033[3mkeep original files unchanged\033[0m\n"
|
|
"\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
int main(int argc, char * argv[]) {
|
|
|
|
int opt;
|
|
while ((opt = getopt(argc, argv, "?ck")) != -1) {
|
|
switch (opt) {
|
|
case 'c':
|
|
to_stdout = 1;
|
|
keep = 1;
|
|
break;
|
|
case 'k':
|
|
keep = 1;
|
|
break;
|
|
case '?':
|
|
return usage(argc, argv);
|
|
default:
|
|
fprintf(stderr, "%s: unrecognized option '%c'\n", argv[0], opt);
|
|
break;
|
|
}
|
|
}
|
|
|
|
FILE * f;
|
|
if (optind >= argc || !strcmp(argv[optind],"-")) {
|
|
f = stdin;
|
|
} else {
|
|
f =fopen(argv[optind],"r");
|
|
}
|
|
|
|
if (!f) {
|
|
fprintf(stderr, "%s: %s: %s\n", argv[0], argv[optind], strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
if (!to_stdout && strcmp(&argv[optind][strlen(argv[optind])-3],".gz")) {
|
|
fprintf(stderr, "%s: %s: Don't know how to interpret file name\n", argv[0], argv[optind]);
|
|
return 1;
|
|
}
|
|
|
|
char * maybeProgress = getenv("GUNZIP_PROGRESS");
|
|
|
|
if (maybeProgress && !strcmp(maybeProgress, "1")) {
|
|
progress = 1;
|
|
fseek(f, 0, SEEK_END);
|
|
total_length = ftell(f);
|
|
fseek(f, 0, SEEK_SET);
|
|
}
|
|
|
|
struct inflate_context ctx;
|
|
ctx.input_priv = f;
|
|
if (to_stdout) {
|
|
ctx.output_priv = stdout;
|
|
} else {
|
|
char * tmp = strdup(argv[optind]);
|
|
tmp[strlen(argv[optind])-3] = '\0';
|
|
ctx.output_priv = fopen(tmp,"w");
|
|
free(tmp);
|
|
}
|
|
ctx.get_input = progress ? _get_progress : _get;
|
|
ctx.write_output = _write;
|
|
ctx.ring = NULL; /* Use the global one */
|
|
|
|
if (gzip_decompress(&ctx)) {
|
|
return 1;
|
|
}
|
|
|
|
fflush(ctx.output_priv);
|
|
|
|
if (!to_stdout) {
|
|
fclose(ctx.output_priv);
|
|
}
|
|
|
|
if (!keep) {
|
|
unlink(argv[optind]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|