firmware/br-ext-chip-ingenic/board/t40/kernel/patches/00000-fs_squashfs_lzma_wrapper.c.patch

diff -drupN a/fs/squashfs/lzma_wrapper.c b/fs/squashfs/lzma_wrapper.c
--- a/fs/squashfs/lzma_wrapper.c	1970-01-01 03:00:00.000000000 +0300
+++ b/fs/squashfs/lzma_wrapper.c	2022-06-09 05:02:35.000000000 +0300
@@ -0,0 +1,155 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * lzma_wrapper.c
+ */
+
+#include <asm/unaligned.h>
+#include <linux/buffer_head.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/vmalloc.h>
+#include <linux/decompress/unlzma.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "squashfs_fs_i.h"
+#include "squashfs.h"
+#include "decompressor.h"
+#include <linux/module.h>
+#include "page_actor.h"
+#include "jz-lzma.h"
+struct squashfs_lzma {
+	void	*input;
+	void	*output;
+};
+
+/* decompress_unlzma.c is currently non re-entrant... */
+DEFINE_MUTEX(lzma_mutex);
+
+/* decompress_unlzma.c doesn't provide any context in its callbacks... */
+static int lzma_error;
+
+static void error(char *m)
+{
+	ERROR("unlzma error: %s\n", m);
+	lzma_error = 1;
+}
+
+
+static void *lzma_init(struct squashfs_sb_info *msblk,void *buff)
+{
+    int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
+	struct squashfs_lzma *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+	if (stream == NULL)
+        {
+    	goto failed;}
+	stream->input = vmalloc(block_size);
+	if (stream->input == NULL)
+        {
+		goto failed;}
+	stream->output = vmalloc(block_size);
+	if (stream->output == NULL)
+        {
+		goto failed2;}
+
+	return stream;
+
+failed2:
+	vfree(stream->input);
+failed:
+	ERROR("failed to allocate lzma workspace\n");
+	kfree(stream);
+	return NULL;
+}
+
+
+static void lzma_free(void *strm)
+{
+	struct squashfs_lzma *stream = strm;
+
+	if (stream) {
+		vfree(stream->input);
+		vfree(stream->output);
+	}
+	kfree(stream);
+}
+
+
+static int lzma_uncompress(struct squashfs_sb_info *msblk, void *strm,
+		struct buffer_head **bh, int b, int offset, int length,
+		struct squashfs_page_actor *output)
+{
+	struct squashfs_lzma *stream = strm;
+	void *buff = stream->input, *data;
+	int avail, i, bytes = length, res;
+	size_t out_len = output->length;
+
+	for (i = 0; i < b; i++) {
+		avail = min(bytes, msblk->devblksize - offset);
+		memcpy(buff, bh[i]->b_data + offset, avail);
+		buff += avail;
+		bytes -= avail;
+		offset = 0;
+		put_bh(bh[i]);
+	}
+#ifdef CONFIG_S_DECOMPRESS_LZMA
+	res = unlzma((unsigned char *)stream->input, length, NULL, NULL, (unsigned char *)stream->output, NULL, error);
+#endif
+
+#ifdef CONFIG_H_DECOMPRESS_LZMA
+	res = unlzma_hardware((unsigned char *)stream->input,length,(unsigned char *)stream->output);
+#endif
+	if (res || lzma_error)
+		goto failed;
+
+	res = bytes = (int)out_len;
+	data = squashfs_first_page(output);
+	buff = stream->output;
+	while (data) {
+		if (bytes <= PAGE_CACHE_SIZE) {
+			memcpy(data, buff, bytes);
+			break;
+		} else {
+			memcpy(data, buff, PAGE_CACHE_SIZE);
+			buff += PAGE_CACHE_SIZE;
+			bytes -= PAGE_CACHE_SIZE;
+			data = squashfs_next_page(output);
+		}
+	}
+	squashfs_finish_page(output);
+
+	return res;
+
+
+failed:
+	ERROR("lzma decompression failed, data probably corrupt\n");
+	return -EIO;
+}
+
+const struct squashfs_decompressor squashfs_lzma_comp_ops = {
+	.init = lzma_init,
+	.free = lzma_free,
+	.decompress = lzma_uncompress,
+	.id = LZMA_COMPRESSION,
+	.name = "lzma",
+	.supported = 1
+};
+