1 ///////////////////////////////////////////////////////////////////////////////
4 /// \brief Filter for ARM-Thumb binaries
6 // Authors: Igor Pavlov
9 // This file has been put into the public domain.
10 // You can do whatever you want with this file.
12 ///////////////////////////////////////////////////////////////////////////////
14 #include "simple_private.h"
18 armthumb_code(lzma_simple *simple lzma_attribute((__unused__)),
19 uint32_t now_pos, bool is_encoder,
20 uint8_t *buffer, size_t size)
23 for (i = 0; i + 4 <= size; i += 2) {
24 if ((buffer[i + 1] & 0xF8) == 0xF0
25 && (buffer[i + 3] & 0xF8) == 0xF8) {
26 uint32_t src = ((buffer[i + 1] & 0x7) << 19)
27 | (buffer[i + 0] << 11)
28 | ((buffer[i + 3] & 0x7) << 8)
35 dest = now_pos + (uint32_t)(i) + 4 + src;
37 dest = src - (now_pos + (uint32_t)(i) + 4);
40 buffer[i + 1] = 0xF0 | ((dest >> 19) & 0x7);
41 buffer[i + 0] = (dest >> 11);
42 buffer[i + 3] = 0xF8 | ((dest >> 8) & 0x7);
43 buffer[i + 2] = (dest);
53 armthumb_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
54 const lzma_filter_info *filters, bool is_encoder)
56 return lzma_simple_coder_init(next, allocator, filters,
57 &armthumb_code, 0, 4, 2, is_encoder);
62 lzma_simple_armthumb_encoder_init(lzma_next_coder *next,
63 lzma_allocator *allocator, const lzma_filter_info *filters)
65 return armthumb_coder_init(next, allocator, filters, true);
70 lzma_simple_armthumb_decoder_init(lzma_next_coder *next,
71 lzma_allocator *allocator, const lzma_filter_info *filters)
73 return armthumb_coder_init(next, allocator, filters, false);