Move sqfs_istream_t & sqfs_ostream_t into libsquashfs

For now, only the interfaces and helper functions are moved, the
concrete implementations remain in libio.

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

1 files changed, 100 insertions, 0 deletions

diff --git a/lib/sqfs/src/istream.c b/lib/sqfs/src/istream.c
new file mode 100644
index 0000000..3d89461
--- /dev/null
+++ b/lib/sqfs/src/istream.c
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * istream.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "config.h"
+
+#include "sqfs/io.h"
+
+#include <string.h>
+
+sqfs_s32 sqfs_istream_read(sqfs_istream_t *strm, void *data, size_t size)
+{
+	sqfs_s32 total = 0;
+
+	if (size > 0x7FFFFFFF)
+		size = 0x7FFFFFFF;
+
+	while (size > 0) {
+		const sqfs_u8 *ptr;
+		size_t diff;
+		int ret;
+
+		ret = strm->get_buffered_data(strm, &ptr, &diff, size);
+		if (ret > 0)
+			break;
+		if (ret < 0)
+			return ret;
+
+		if (diff > size)
+			diff = size;
+
+		memcpy(data, ptr, diff);
+		strm->advance_buffer(strm, diff);
+		data = (char *)data + diff;
+		size -= diff;
+		total += diff;
+	}
+
+	return total;
+}
+
+int sqfs_istream_skip(sqfs_istream_t *strm, sqfs_u64 size)
+{
+	while (size > 0) {
+		const sqfs_u8 *ptr;
+		size_t diff;
+		int ret;
+
+		ret = strm->get_buffered_data(strm, &ptr, &diff, size);
+		if (ret < 0)
+			return ret;
+		if (ret > 0)
+			break;
+
+		if ((sqfs_u64)diff > size)
+			diff = size;
+
+		size -= diff;
+		strm->advance_buffer(strm, diff);
+	}
+
+	return 0;
+}
+
+sqfs_s32 sqfs_istream_splice(sqfs_istream_t *in, sqfs_ostream_t *out,
+			     sqfs_u32 size)
+{
+	sqfs_s32 total = 0;
+
+	if (size > 0x7FFFFFFF)
+		size = 0x7FFFFFFF;
+
+	while (size > 0) {
+		const sqfs_u8 *ptr;
+		size_t diff;
+		int ret;
+
+		ret = in->get_buffered_data(in, &ptr, &diff, size);
+		if (ret < 0)
+			return ret;
+		if (ret > 0)
+			break;
+
+		if (diff > size)
+			diff = size;
+
+		ret = out->append(out, ptr, diff);
+		if (ret)
+			return ret;
+
+		total += diff;
+		size -= diff;
+		in->advance_buffer(in, diff);
+	}
+
+	return total;
+}