1 files changed, 83 insertions, 0 deletions
diff --git a/inflate.c b/inflate.c
new file mode 100644
index 0000000..c1847fa
--- /dev/null
+++ b/inflate.c
@@ -0,0 +1,83 @@
+/* $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;
+}