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