84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/* $Id: inflate.c,v 1.7 2002/01/31 18:28:24 ukai Exp $ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <zlib.h>
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#undef BUFSIZE
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#define BUFSIZE 4096
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static char dummy_head[1 + 1] = {
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0x8 + 0x7 * 0x10,
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(((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
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};
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int
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main(int argc, char **argv)
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{
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z_stream s;
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FILE *f;
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char inbuf[BUFSIZE], outbuf[BUFSIZE];
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int status, flush, retry = 0, len = 0;
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if (argc > 1) {
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f = fopen(argv[1], "rb");
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if (!f) {
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fprintf(stderr, "%s: cannot open %s\n", argv[0], argv[1]);
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exit(1);
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}
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}
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else
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f = stdin;
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s.zalloc = Z_NULL;
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s.zfree = Z_NULL;
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s.opaque = Z_NULL;
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status = inflateInit(&s);
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if (status != Z_OK) {
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fprintf(stderr, "%s: inflateInit() %s\n", argv[0], zError(status));
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exit(1);
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}
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s.avail_in = 0;
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s.next_out = (Bytef *) outbuf;
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s.avail_out = sizeof(outbuf);
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flush = Z_NO_FLUSH;
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while (1) {
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if (s.avail_in == 0) {
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s.next_in = (Bytef *) inbuf;
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len = s.avail_in = fread(inbuf, 1, sizeof(inbuf), f);
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}
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status = inflate(&s, flush);
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if (status == Z_STREAM_END || status == Z_BUF_ERROR) {
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if (sizeof(outbuf) - s.avail_out)
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fwrite(outbuf, 1, sizeof(outbuf) - s.avail_out, stdout);
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break;
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}
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if (status == Z_DATA_ERROR && !retry++) {
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status = inflateReset(&s);
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if (status != Z_OK) {
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fprintf(stderr, "%s: inflateReset() %s\n", argv[0],
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zError(status));
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exit(1);
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}
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s.next_in = (Bytef *) dummy_head;
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s.avail_in = sizeof(dummy_head);
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status = inflate(&s, flush);
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s.next_in = (Bytef *) inbuf;
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s.avail_in = len;
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continue;
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}
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if (status != Z_OK) {
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fprintf(stderr, "%s: inflate() %s\n", argv[0], zError(status));
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exit(1);
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}
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if (s.avail_out == 0) {
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fwrite(outbuf, 1, sizeof(outbuf), stdout);
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s.next_out = (Bytef *) outbuf;
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s.avail_out = sizeof(outbuf);
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}
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retry = 1;
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}
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inflateEnd(&s);
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fclose(f);
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return 0;
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}
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