Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/liblzma/simple/powerpc.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       powerpc.c
+/// \brief      Filter for PowerPC (big endian) binaries
+///
+//  Authors:    Igor Pavlov
+//              Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+powerpc_code(lzma_simple *simple lzma_attribute((unused)),
+                uint32_t now_pos, bool is_encoder,
+                uint8_t *buffer, size_t size)
+{
+        size_t i;
+        for (i = 0; i + 4 <= size; i += 4) {
+                // PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link)
+                if ((buffer[i] >> 2) == 0x12
+                                && ((buffer[i + 3] & 3) == 1)) {
+
+                        const uint32_t src = ((buffer[i + 0] & 3) << 24)
+                                        | (buffer[i + 1] << 16)
+                                        | (buffer[i + 2] << 8)
+                                        | (buffer[i + 3] & (~3));
+
+                        uint32_t dest;
+                        if (is_encoder)
+                                dest = now_pos + (uint32_t)(i) + src;
+                        else
+                                dest = src - (now_pos + (uint32_t)(i));
+
+                        buffer[i + 0] = 0x48 | ((dest >> 24) &  0x03);
+                        buffer[i + 1] = (dest >> 16);
+                        buffer[i + 2] = (dest >> 8);
+                        buffer[i + 3] &= 0x03;
+                        buffer[i + 3] |= dest;
+                }
+        }
+
+        return i;
+}
+
+
+static lzma_ret
+powerpc_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,
+                        &powerpc_code, 0, 4, 4, is_encoder);
+}
+
+
+extern lzma_ret
+lzma_simple_powerpc_encoder_init(lzma_next_coder *next,
+                lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+        return powerpc_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_powerpc_decoder_init(lzma_next_coder *next,
+                lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+        return powerpc_coder_init(next, allocator, filters, false);
+}