1 files changed, 156 insertions, 0 deletions
diff --git a/lib/xfrm/src/ostream.c b/lib/xfrm/src/ostream.c
new file mode 100644
index 0000000..8e33a91
--- /dev/null
+++ b/lib/xfrm/src/ostream.c
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * ostream.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "compat.h"
+#include "sqfs/io.h"
+#include "sqfs/error.h"
+#include "xfrm/compress.h"
+#include "xfrm/wrap.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+
+#define BUFSZ (262144)
+
+typedef struct ostream_xfrm_t {
+	sqfs_ostream_t base;
+
+	sqfs_ostream_t *wrapped;
+	xfrm_stream_t *xfrm;
+
+	size_t inbuf_used;
+
+	sqfs_u8 inbuf[BUFSZ];
+	sqfs_u8 outbuf[BUFSZ];
+} ostream_xfrm_t;
+
+static int flush_inbuf(ostream_xfrm_t *xfrm, bool finish)
+{
+	const sqfs_u32 avail_out = sizeof(xfrm->outbuf);
+	const sqfs_u32 avail_in = xfrm->inbuf_used;
+	const int mode = finish ? XFRM_STREAM_FLUSH_FULL :
+		XFRM_STREAM_FLUSH_NONE;
+	sqfs_u32 off_in = 0, off_out = 0;
+	int ret, ioret;
+
+	while (finish || off_in < avail_in) {
+		ret = xfrm->xfrm->process_data(xfrm->xfrm,
+					       xfrm->inbuf + off_in,
+					       avail_in - off_in,
+					       xfrm->outbuf + off_out,
+					       avail_out - off_out,
+					       &off_in, &off_out, mode);
+
+		if (ret == XFRM_STREAM_ERROR)
+			return SQFS_ERROR_COMPRESSOR;
+
+		ioret = xfrm->wrapped->append(xfrm->wrapped,
+					      xfrm->outbuf, off_out);
+		if (ioret)
+			return ioret;
+
+		off_out = 0;
+
+		if (ret == XFRM_STREAM_END)
+			break;
+	}
+
+	if (off_in < avail_in) {
+		memmove(xfrm->inbuf, xfrm->inbuf + off_in, avail_in - off_in);
+		xfrm->inbuf_used -= off_in;
+	} else {
+		xfrm->inbuf_used = 0;
+	}
+
+	return 0;
+}
+
+static int xfrm_append(sqfs_ostream_t *strm, const void *data, size_t size)
+{
+	ostream_xfrm_t *xfrm = (ostream_xfrm_t *)strm;
+	size_t diff;
+
+	while (size > 0) {
+		if (xfrm->inbuf_used >= BUFSZ) {
+			int ret = flush_inbuf(xfrm, false);
+			if (ret)
+				return ret;
+		}
+
+		diff = BUFSZ - xfrm->inbuf_used;
+
+		if (diff > size)
+			diff = size;
+
+		if (data == NULL) {
+			memset(xfrm->inbuf + xfrm->inbuf_used, 0, diff);
+		} else {
+			memcpy(xfrm->inbuf + xfrm->inbuf_used, data, diff);
+			data = (const char *)data + diff;
+		}
+
+		xfrm->inbuf_used += diff;
+		size -= diff;
+	}
+
+	return 0;
+}
+
+static int xfrm_flush(sqfs_ostream_t *strm)
+{
+	ostream_xfrm_t *xfrm = (ostream_xfrm_t *)strm;
+
+	if (xfrm->inbuf_used > 0) {
+		int ret = flush_inbuf(xfrm, true);
+		if (ret)
+			return ret;
+	}
+
+	return xfrm->wrapped->flush(xfrm->wrapped);
+}
+
+static const char *xfrm_get_filename(sqfs_ostream_t *strm)
+{
+	ostream_xfrm_t *xfrm = (ostream_xfrm_t *)strm;
+
+	return xfrm->wrapped->get_filename(xfrm->wrapped);
+}
+
+static void xfrm_destroy(sqfs_object_t *obj)
+{
+	ostream_xfrm_t *xfrm = (ostream_xfrm_t *)obj;
+
+	sqfs_drop(xfrm->wrapped);
+	sqfs_drop(xfrm->xfrm);
+	free(xfrm);
+}
+
+sqfs_ostream_t *ostream_xfrm_create(sqfs_ostream_t *strm, xfrm_stream_t *xfrm)
+{
+	ostream_xfrm_t *stream = calloc(1, sizeof(*stream));
+	sqfs_ostream_t *base = (sqfs_ostream_t *)stream;
+
+	if (stream == NULL)
+		goto fail;
+
+	sqfs_object_init(stream, xfrm_destroy, NULL);
+
+	stream->wrapped = sqfs_grab(strm);
+	stream->xfrm = sqfs_grab(xfrm);
+	stream->inbuf_used = 0;
+	base->append = xfrm_append;
+	base->flush = xfrm_flush;
+	base->get_filename = xfrm_get_filename;
+	return base;
+fail:
+	fprintf(stderr, "%s: error initializing compressor.\n",
+		strm->get_filename(strm));
+	return NULL;
+}