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