[PATCH 06/11] Better error handling in compress_all()

@@ -12,7 +12,7 @@ int compress_start(z_stream *stream,
                    unsigned char *in, unsigned long in_size,
                    unsigned char *out, unsigned long out_size)
 {
-	stream->next_out = (out ? out : xmalloc(out_size));
+	stream->next_out = out;
 	stream->avail_out = out_size;
 	stream->next_in = in;
 	stream->avail_in = in_size;

@@ -36,19 +36,18 @@ unsigned long compress_free(z_stream *stream)
 	return stream->total_out;
 }
 
-unsigned long compress_all(int level, unsigned char *data,
-                           unsigned long size, unsigned char **out)
+unsigned long compress_all(int level, unsigned char *in,
+                           unsigned long in_size, unsigned char **out)
 {
-	int bound, result;
+	unsigned long out_size;
 	z_stream stream;
 
-	bound = compress_alloc(&stream, level, size);
-	compress_start(&stream, data, size, NULL, bound);
+	out_size = compress_alloc(&stream, level, in_size);
+	*out = xmalloc(out_size);
 
-	*out = stream.next_out;
-	result = compress_next(&stream, Z_FINISH);
-
-	if (result != Z_STREAM_END) {
+	if (   compress_start(&stream, in, in_size, *out, out_size) != Z_OK
+	    || compress_next(&stream, Z_FINISH) != Z_STREAM_END)
+	{
 		compress_free(&stream);
 		free(*out);
 		*out = NULL;