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// SPDX-License-Identifier: 0BSD
///////////////////////////////////////////////////////////////////////////////
//
/// \file arm.c
/// \brief Filter for ARM binaries
///
// Authors: Igor Pavlov
// Lasse Collin
//
///////////////////////////////////////////////////////////////////////////////
#include "simple_private.h"
static size_t
arm_code(void *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) {
if (buffer[i + 3] == 0xEB) {
uint32_t src = ((uint32_t)(buffer[i + 2]) << 16)
| ((uint32_t)(buffer[i + 1]) << 8)
| (uint32_t)(buffer[i + 0]);
src <<= 2;
uint32_t dest;
if (is_encoder)
dest = now_pos + (uint32_t)(i) + 8 + src;
else
dest = src - (now_pos + (uint32_t)(i) + 8);
dest >>= 2;
buffer[i + 2] = (dest >> 16);
buffer[i + 1] = (dest >> 8);
buffer[i + 0] = dest;
}
}
return i;
}
static lzma_ret
arm_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
const lzma_filter_info *filters, bool is_encoder)
{
return lzma_simple_coder_init(next, allocator, filters,
&arm_code, 0, 4, 4, is_encoder);
}
#ifdef HAVE_ENCODER_ARM
extern lzma_ret
lzma_simple_arm_encoder_init(lzma_next_coder *next,
const lzma_allocator *allocator,
const lzma_filter_info *filters)
{
return arm_coder_init(next, allocator, filters, true);
}
#endif
#ifdef HAVE_DECODER_ARM
extern lzma_ret
lzma_simple_arm_decoder_init(lzma_next_coder *next,
const lzma_allocator *allocator,
const lzma_filter_info *filters)
{
return arm_coder_init(next, allocator, filters, false);
}
#endif
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