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authorLasse Collin <lasse.collin@tukaani.org>2007-12-09 00:42:33 +0200
committerLasse Collin <lasse.collin@tukaani.org>2007-12-09 00:42:33 +0200
commit5d018dc03549c1ee4958364712fb0c94e1bf2741 (patch)
tree1b211911fb33fddb3f04b77f99e81df23623ffc4 /src/liblzma/simple/armthumb.c
downloadxz-5d018dc03549c1ee4958364712fb0c94e1bf2741.tar.xz
Imported to git.
Diffstat (limited to 'src/liblzma/simple/armthumb.c')
-rw-r--r--src/liblzma/simple/armthumb.c81
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
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--- /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);
+}