1 ///////////////////////////////////////////////////////////////////////////////
4 /// \brief Filter for PowerPC (big endian) binaries
6 // Copyright (C) 1999-2006 Igor Pavlov
7 // Copyright (C) 2007 Lasse Collin
9 // This library is free software; you can redistribute it and/or
10 // modify it under the terms of the GNU Lesser General Public
11 // License as published by the Free Software Foundation; either
12 // version 2.1 of the License, or (at your option) any later version.
14 // This library is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 // Lesser General Public License for more details.
19 ///////////////////////////////////////////////////////////////////////////////
21 #include "simple_private.h"
25 powerpc_code(lzma_simple *simple lzma_attribute((unused)),
26 uint32_t now_pos, bool is_encoder,
27 uint8_t *buffer, size_t size)
30 for (i = 0; i + 4 <= size; i += 4) {
31 // PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link)
32 if ((buffer[i] >> 2) == 0x12
33 && ((buffer[i + 3] & 3) == 1)) {
35 const uint32_t src = ((buffer[i + 0] & 3) << 24)
36 | (buffer[i + 1] << 16)
37 | (buffer[i + 2] << 8)
38 | (buffer[i + 3] & (~3));
42 dest = now_pos + (uint32_t)(i) + src;
44 dest = src - (now_pos + (uint32_t)(i));
46 buffer[i + 0] = 0x48 | ((dest >> 24) & 0x03);
47 buffer[i + 1] = (dest >> 16);
48 buffer[i + 2] = (dest >> 8);
49 buffer[i + 3] &= 0x03;
50 buffer[i + 3] |= dest;
59 powerpc_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
60 const lzma_filter_info *filters, bool is_encoder)
62 return lzma_simple_coder_init(next, allocator, filters,
63 &powerpc_code, 0, 4, is_encoder);
68 lzma_simple_powerpc_encoder_init(lzma_next_coder *next,
69 lzma_allocator *allocator, const lzma_filter_info *filters)
71 return powerpc_coder_init(next, allocator, filters, true);
76 lzma_simple_powerpc_decoder_init(lzma_next_coder *next,
77 lzma_allocator *allocator, const lzma_filter_info *filters)
79 return powerpc_coder_init(next, allocator, filters, false);