/* $Id: inflate.c,v 1.7 2002/01/31 18:28:24 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; }