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#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <zlib.h>
#define MYBUFSIZ (BUFSIZ * 0x10)
/* cf. rfc1950.txt */
static char dummy_head[1 + 1] = {
0x8 + 0x7 * 0x10,
(((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
};
int
main(int argc, char *argv[])
{
int err, nfiles, i, nin, inrest, eoin, nout, outrest, eoout, ninflates,
raw;
z_stream d_stream;
char *me = argv[0];
char *inbuf, *outbuf, **filev;
if (!(inbuf = malloc(MYBUFSIZ))) {
fprintf(stderr, "%s: inbuf = malloc(%lu): %s\n", me,
(unsigned long)MYBUFSIZ, strerror(errno));
exit(1);
}
if (!(outbuf = malloc(MYBUFSIZ))) {
fprintf(stderr, "%s: outbuf = malloc(%lu): %s\n", me,
(unsigned long)MYBUFSIZ, strerror(errno));
exit(1);
}
d_stream.zalloc = NULL;
d_stream.zfree = NULL;
d_stream.opaque = NULL;
if (argc > 1) {
nfiles = argc - 1;
filev = &argv[1];
}
else {
static char *myargv[] = { "-", NULL };
nfiles = 1;
filev = myargv;
}
if ((err = inflateInit(&d_stream)) != Z_OK) {
fprintf(stderr, "%s: inflateInit(&d_stream): %d\n", me, err);
exit(1);
}
for (raw = ninflates = i = inrest = outrest = 0, eoout = 1; i < nfiles;
++i) {
FILE *in;
if (strcmp(filev[i], "-")) {
if (!(in = fopen(filev[i], "rb"))) {
fprintf(stderr, "%s: fopen(\"%s\", \"rb\"): %s\n", me,
filev[i], strerror(errno));
exit(1);
}
}
else
in = stdin;
for (eoin = 0;;) {
if ((nin =
fread(&inbuf[inrest], 1, MYBUFSIZ - inrest,
in)) < MYBUFSIZ - inrest) {
if (ferror(in)) {
fprintf(stderr, "%s: fread(&inbuf[%d], 1, %d, in): %s\n",
me, inrest, MYBUFSIZ - inrest, strerror(errno));
exit(1);
}
eoin = 1;
}
if (nin > 0) {
retry:
d_stream.next_in = inbuf;
d_stream.avail_in = inrest + nin;
for (eoout = 0;;) {
d_stream.next_out = &outbuf[outrest];
d_stream.avail_out = MYBUFSIZ - outrest;
switch (err = inflate(&d_stream, Z_NO_FLUSH)) {
case Z_OK:
if (!
((nout =
fwrite(outbuf, 1, MYBUFSIZ - d_stream.avail_out,
stdout)) > 0)) {
fprintf(stderr,
"%s: fwrite(outbuf, 1, %d, stdout): %s\n",
me, MYBUFSIZ - d_stream.avail_out,
strerror(errno));
exit(1);
}
memmove(outbuf, &outbuf[nout],
MYBUFSIZ - d_stream.avail_out - nout);
outrest = MYBUFSIZ - d_stream.avail_out - nout;
++ninflates;
break;
case Z_STREAM_END:
case Z_BUF_ERROR:
ninflates = 0;
outrest = MYBUFSIZ - d_stream.avail_out;
eoout = 1;
goto next_fread;
case Z_DATA_ERROR:
if (!ninflates) {
if ((err = inflateReset(&d_stream)) != Z_OK) {
fprintf(stderr,
"%s: inflateReset(&d_stream): %d\n",
me, err);
exit(1);
}
d_stream.next_in = dummy_head;
d_stream.avail_in = sizeof(dummy_head);
if ((err = inflate(&d_stream, Z_NO_FLUSH)) == Z_OK) {
raw = ninflates = 1;
goto retry;
}
}
default:
fprintf(stderr,
"%s: inflate(&d_stream, Z_NO_FLUSH): %d\n", me,
err);
exit(1);
}
}
}
next_fread:
if (d_stream.avail_in) {
memmove(inbuf, &inbuf[inrest + nin - d_stream.avail_in],
d_stream.avail_in);
inrest = d_stream.avail_in;
}
else
inrest = 0;
if (eoin)
break;
}
if (in != stdin)
fclose(in);
}
if (!eoout && !raw) {
fprintf(stderr, "%s: short input\n", me);
exit(1);
}
if (inrest)
fprintf(stderr, "%s: trailing garbages are ignored\n", me);
if (outrest && fwrite(outbuf, 1, outrest, stdout) < outrest) {
fprintf(stderr, "%s: fwrite(outbuf, 1, %d, stdout): %s\n", me, outrest,
strerror(errno));
exit(1);
}
return 0;
}
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