1 files changed, 81 insertions, 0 deletions
diff --git a/src/liblzma/simple/armthumb.c b/src/liblzma/simple/armthumb.c
new file mode 100644
index 00000000..51ed2c43
--- /dev/null
+++ b/src/liblzma/simple/armthumb.c
@@ -0,0 +1,81 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       armthumb.c
+/// \brief      Filter for ARM-Thumb binaries
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 Lasse Collin
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License, or (at your option) any later version.
+//
+//  This library 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
+//  Lesser General Public License for more details.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+armthumb_code(lzma_simple *simple lzma_attribute((unused)),
+		uint32_t now_pos, bool is_encoder,
+		uint8_t *buffer, size_t size)
+{
+	uint32_t i;
+	for (i = 0; i + 4 <= size; i += 2) {
+		if ((buffer[i + 1] & 0xF8) == 0xF0
+				&& (buffer[i + 3] & 0xF8) == 0xF8) {
+			uint32_t src = ((buffer[i + 1] & 0x7) << 19)
+					| (buffer[i + 0] << 11)
+					| ((buffer[i + 3] & 0x7) << 8)
+					| (buffer[i + 2]);
+
+			src <<= 1;
+
+			uint32_t dest;
+			if (is_encoder)
+				dest = now_pos + (uint32_t)(i) + 4 + src;
+			else
+				dest = src - (now_pos + (uint32_t)(i) + 4);
+
+			dest >>= 1;
+			buffer[i + 1] = 0xF0 | ((dest >> 19) & 0x7);
+			buffer[i + 0] = (dest >> 11);
+			buffer[i + 3] = 0xF8 | ((dest >> 8) & 0x7);
+			buffer[i + 2] = (dest);
+			i += 2;
+		}
+	}
+
+	return i;
+}
+
+
+static lzma_ret
+armthumb_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	return lzma_simple_coder_init(next, allocator, filters,
+			&armthumb_code, 0, 4, is_encoder);
+}
+
+
+extern lzma_ret
+lzma_simple_armthumb_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return armthumb_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_armthumb_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return armthumb_coder_init(next, allocator, filters, false);
+}