1 ///////////////////////////////////////////////////////////////////////////////
2 //
3 /// \file sparc.c
4 /// \brief Filter for SPARC binaries
5 ///
6 // Authors: Igor Pavlov
7 // Lasse Collin
8 //
9 // This file has been put into the public domain.
10 // You can do whatever you want with this file.
11 //
12 ///////////////////////////////////////////////////////////////////////////////
13
14 #include "simple_private.h"
15
16
17 static size_t
sparc_code(void * simple lzma_attribute ((__unused__)),uint32_t now_pos,bool is_encoder,uint8_t * buffer,size_t size)18 sparc_code(void *simple lzma_attribute((__unused__)),
19 uint32_t now_pos, bool is_encoder,
20 uint8_t *buffer, size_t size)
21 {
22 size_t i;
23 for (i = 0; i + 4 <= size; i += 4) {
24
25 if ((buffer[i] == 0x40 && (buffer[i + 1] & 0xC0) == 0x00)
26 || (buffer[i] == 0x7F
27 && (buffer[i + 1] & 0xC0) == 0xC0)) {
28
29 uint32_t src = ((uint32_t)buffer[i + 0] << 24)
30 | ((uint32_t)buffer[i + 1] << 16)
31 | ((uint32_t)buffer[i + 2] << 8)
32 | ((uint32_t)buffer[i + 3]);
33
34 src <<= 2;
35
36 uint32_t dest;
37 if (is_encoder)
38 dest = now_pos + (uint32_t)(i) + src;
39 else
40 dest = src - (now_pos + (uint32_t)(i));
41
42 dest >>= 2;
43
44 dest = (((0 - ((dest >> 22) & 1)) << 22) & 0x3FFFFFFF)
45 | (dest & 0x3FFFFF)
46 | 0x40000000;
47
48 buffer[i + 0] = (uint8_t)(dest >> 24);
49 buffer[i + 1] = (uint8_t)(dest >> 16);
50 buffer[i + 2] = (uint8_t)(dest >> 8);
51 buffer[i + 3] = (uint8_t)(dest);
52 }
53 }
54
55 return i;
56 }
57
58
59 static lzma_ret
sparc_coder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters,bool is_encoder)60 sparc_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
61 const lzma_filter_info *filters, bool is_encoder)
62 {
63 return lzma_simple_coder_init(next, allocator, filters,
64 &sparc_code, 0, 4, 4, is_encoder);
65 }
66
67
68 extern lzma_ret
lzma_simple_sparc_encoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)69 lzma_simple_sparc_encoder_init(lzma_next_coder *next,
70 const lzma_allocator *allocator,
71 const lzma_filter_info *filters)
72 {
73 return sparc_coder_init(next, allocator, filters, true);
74 }
75
76
77 extern lzma_ret
lzma_simple_sparc_decoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)78 lzma_simple_sparc_decoder_init(lzma_next_coder *next,
79 const lzma_allocator *allocator,
80 const lzma_filter_info *filters)
81 {
82 return sparc_coder_init(next, allocator, filters, false);
83 }
84