Move library source into src sub-directory

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 106 insertions, 0 deletions

diff --git a/lib/io/src/xfrm/istream.c b/lib/io/src/xfrm/istream.c
new file mode 100644
index 0000000..4a1ad77
--- /dev/null
+++ b/lib/io/src/xfrm/istream.c
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * istream.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+typedef struct istream_xfrm_t {
+	istream_t base;
+
+	istream_t *wrapped;
+	xfrm_stream_t *xfrm;
+
+	sqfs_u8 uncompressed[BUFSZ];
+} istream_xfrm_t;
+
+static int xfrm_precache(istream_t *base)
+{
+	istream_xfrm_t *xfrm = (istream_xfrm_t *)base;
+	int ret;
+
+	ret = istream_precache(xfrm->wrapped);
+	if (ret != 0)
+		return ret;
+
+	for (;;) {
+		const sqfs_u32 in_sz = xfrm->wrapped->buffer_used;
+		const sqfs_u32 out_sz = sizeof(xfrm->uncompressed);
+		sqfs_u32 in_off = 0, out_off = base->buffer_used;
+		int mode = XFRM_STREAM_FLUSH_NONE;
+
+		if (xfrm->wrapped->eof)
+			mode = XFRM_STREAM_FLUSH_FULL;
+
+		ret = xfrm->xfrm->process_data(xfrm->xfrm,
+					       xfrm->wrapped->buffer, in_sz,
+					       base->buffer + out_off,
+					       out_sz - out_off,
+					       &in_off, &out_off, mode);
+
+		if (ret == XFRM_STREAM_ERROR) {
+			fprintf(stderr, "%s: internal error in decompressor.\n",
+				base->get_filename(base));
+			return -1;
+		}
+
+		base->buffer_used = out_off;
+		xfrm->wrapped->buffer_offset = in_off;
+
+		if (ret == XFRM_STREAM_BUFFER_FULL || out_off >= out_sz)
+			break;
+
+		ret = istream_precache(xfrm->wrapped);
+		if (ret != 0)
+			return ret;
+
+		if (xfrm->wrapped->eof && xfrm->wrapped->buffer_used == 0) {
+			if (base->buffer_used == 0)
+				base->eof = true;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static const char *xfrm_get_filename(istream_t *strm)
+{
+	istream_xfrm_t *xfrm = (istream_xfrm_t *)strm;
+
+	return xfrm->wrapped->get_filename(xfrm->wrapped);
+}
+
+static void xfrm_destroy(sqfs_object_t *obj)
+{
+	istream_xfrm_t *xfrm = (istream_xfrm_t *)obj;
+
+	sqfs_drop(xfrm->xfrm);
+	sqfs_drop(xfrm->wrapped);
+	free(xfrm);
+}
+
+istream_t *istream_xfrm_create(istream_t *strm, xfrm_stream_t *xfrm)
+{
+	istream_xfrm_t *stream = calloc(1, sizeof(*stream));
+	istream_t *base = (istream_t *)stream;
+
+	if (stream == NULL)
+		goto fail;
+
+	sqfs_object_init(stream, xfrm_destroy, NULL);
+
+	stream->wrapped = sqfs_grab(strm);
+	stream->xfrm = sqfs_grab(xfrm);
+
+	base->precache = xfrm_precache;
+	base->get_filename = xfrm_get_filename;
+	base->buffer = stream->uncompressed;
+	base->eof = false;
+	return base;
+fail:
+	fprintf(stderr, "%s: error initializing decompressor stream.\n",
+		strm->get_filename(strm));
+	return NULL;
+}