1 files changed, 58 insertions, 0 deletions
diff --git a/deflate.c b/deflate.c
new file mode 100644
index 0000000..0464cc6
--- /dev/null
+++ b/deflate.c
@@ -0,0 +1,58 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <zlib.h>
+
+#undef BUFSIZE
+#define BUFSIZE 4096
+
+int
+main(int argc, char **argv)
+{
+    z_stream s;
+    FILE *f;
+    char inbuf[BUFSIZE], outbuf[BUFSIZE];
+    int status, flush;
+
+    if (argc > 1) {
+	f = fopen(argv[1], "rb");
+	if (! f)
+	    exit(1);
+    } else
+	f = stdin;
+
+    s.zalloc = Z_NULL;
+    s.zfree = Z_NULL;
+    s.opaque = Z_NULL;
+    status = deflateInit(&s, Z_DEFAULT_COMPRESSION);
+    if (status != Z_OK)
+	exit(1);
+    s.avail_in = 0;
+    s.next_out = outbuf;
+    s.avail_out = sizeof(outbuf);
+    flush = Z_NO_FLUSH; 
+    while (1) {
+	if (s.avail_in == 0) {
+	    s.next_in = inbuf;
+	    s.avail_in = fread(inbuf, 1, sizeof(inbuf), f);
+	    if (s.avail_in < sizeof(inbuf))
+		flush = Z_FINISH;
+	}
+	status = deflate(&s, flush);
+	if (status == Z_STREAM_END) {
+	    if (sizeof(outbuf) - s.avail_out)
+		fwrite(outbuf, 1, sizeof(outbuf) - s.avail_out, stdout);
+	    break;
+	}
+	if (status != Z_OK)
+	    exit(1);
+	if (s.avail_out == 0) {
+	    fwrite(outbuf, 1, sizeof(outbuf), stdout);
+	    s.next_out = outbuf;
+	    s.avail_out = sizeof(outbuf);
+	}
+    }
+    deflateEnd(&s);
+    fclose(f);
+    return 0;
+}