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#include <zlib.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#define GZIP_WBITS (16)
int main(int argc, char **argv) {
char *fname = argv[1];
FILE *f = fopen(fname, "r");
int offset = atoi(argv[2]);
int len = atoi(argv[3]);
fseek(f, offset, SEEK_SET);
unsigned char *buf = malloc(sizeof *buf * len);
fread(buf, sizeof *buf, len, f);
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = len;
strm.next_in = buf;
uLong prev_sz = 0;
uLong out_sz = 16328;
unsigned char *out = (unsigned char *) malloc(sizeof *out * out_sz);
int ret = inflateInit2(&strm, GZIP_WBITS);
if (ret != Z_OK) {
return ret;
}
do {
strm.avail_out = out_sz;
strm.next_out = out + prev_sz;
ret = inflate(&strm, Z_NO_FLUSH);
assert(ret != Z_STREAM_ERROR);
switch (ret) {
case Z_NEED_DICT:
ret = Z_DATA_ERROR;
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void) inflateEnd(&strm);
printf("uhh\n");
return ret;
}
unsigned have = out_sz - strm.avail_out;
/*
fwrite(out + prev_sz, have, sizeof *out, stdout);
printf("\n");
*/
prev_sz += have;
if (strm.avail_out == 0) {
out = (unsigned char *) realloc(out, sizeof *out * (prev_sz + out_sz));
}
} while (strm.avail_out == 0);
(void) inflateEnd(&strm);
fwrite(out, prev_sz, sizeof *out, stdout);
printf("\n");
free(out);
return ret;
}
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