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/* $Id: inflate.c,v 1.6 2002/01/31 15:26:19 ukai Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#undef BUFSIZE
#define BUFSIZE 4096
static char dummy_head[1 + 1] = {
0x8 + 0x7 * 0x10,
(((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
};
int
main(int argc, char **argv)
{
z_stream s;
FILE *f;
char inbuf[BUFSIZE], outbuf[BUFSIZE];
int status, flush, retry = 0, len = 0;
if (argc > 1) {
f = fopen(argv[1], "rb");
if (!f) {
fprintf(stderr, "%s: cannot open %s\n", argv[0], argv[1]);
exit(1);
}
}
else
f = stdin;
s.zalloc = Z_NULL;
s.zfree = Z_NULL;
s.opaque = Z_NULL;
status = inflateInit(&s);
if (status != Z_OK) {
fprintf(stderr, "%s: inflateInit() %s\n", argv[0], zError(status));
exit(1);
}
s.avail_in = 0;
s.next_out = (Bytef *) outbuf;
s.avail_out = sizeof(outbuf);
flush = Z_NO_FLUSH;
while (1) {
if (s.avail_in == 0) {
s.next_in = (Bytef *) inbuf;
len = s.avail_in = fread(inbuf, 1, sizeof(inbuf), f);
}
status = inflate(&s, flush);
if (status == Z_STREAM_END || status == Z_BUF_ERROR) {
if (sizeof(outbuf) - s.avail_out)
fwrite(outbuf, 1, sizeof(outbuf) - s.avail_out, stdout);
break;
}
if (status == Z_DATA_ERROR && ! retry++) {
status = inflateReset(&s);
if (status != Z_OK) {
fprintf(stderr, "%s: inflateReset() %s\n", argv[0],
zError(status));
exit(1);
}
s.next_in = (Bytef *) dummy_head;
s.avail_in = sizeof(dummy_head);
status = inflate(&s, flush);
s.next_in = (Bytef *) inbuf;
s.avail_in = len;
continue;
}
if (status != Z_OK) {
fprintf(stderr, "%s: inflate() %s\n", argv[0], zError(status));
exit(1);
}
if (s.avail_out == 0) {
fwrite(outbuf, 1, sizeof(outbuf), stdout);
s.next_out = (Bytef *) outbuf;
s.avail_out = sizeof(outbuf);
}
retry = 1;
}
inflateEnd(&s);
fclose(f);
return 0;
}
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