You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
1.9 KiB
77 lines
1.9 KiB
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
/// \file armthumb.c
|
|
/// \brief Filter for ARM-Thumb 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
|
|
armthumb_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 += 2) {
|
|
if ((buffer[i + 1] & 0xF8) == 0xF0
|
|
&& (buffer[i + 3] & 0xF8) == 0xF8) {
|
|
uint32_t src = (((uint32_t)(buffer[i + 1]) & 7) << 19)
|
|
| ((uint32_t)(buffer[i + 0]) << 11)
|
|
| (((uint32_t)(buffer[i + 3]) & 7) << 8)
|
|
| (uint32_t)(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, const lzma_allocator *allocator,
|
|
const lzma_filter_info *filters, bool is_encoder)
|
|
{
|
|
return lzma_simple_coder_init(next, allocator, filters,
|
|
&armthumb_code, 0, 4, 2, is_encoder);
|
|
}
|
|
|
|
|
|
extern lzma_ret
|
|
lzma_simple_armthumb_encoder_init(lzma_next_coder *next,
|
|
const 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,
|
|
const lzma_allocator *allocator,
|
|
const lzma_filter_info *filters)
|
|
{
|
|
return armthumb_coder_init(next, allocator, filters, false);
|
|
}
|