ce188d4d |
1 | /* Bcj2.h -- BCJ2 Converter for x86 code\r |
2 | 2014-11-10 : Igor Pavlov : Public domain */\r |
3 | \r |
4 | #ifndef __BCJ2_H\r |
5 | #define __BCJ2_H\r |
6 | \r |
7 | #include "7zTypes.h"\r |
8 | \r |
9 | EXTERN_C_BEGIN\r |
10 | \r |
11 | #define BCJ2_NUM_STREAMS 4\r |
12 | \r |
13 | enum\r |
14 | {\r |
15 | BCJ2_STREAM_MAIN,\r |
16 | BCJ2_STREAM_CALL,\r |
17 | BCJ2_STREAM_JUMP,\r |
18 | BCJ2_STREAM_RC\r |
19 | };\r |
20 | \r |
21 | enum\r |
22 | {\r |
23 | BCJ2_DEC_STATE_ORIG_0 = BCJ2_NUM_STREAMS,\r |
24 | BCJ2_DEC_STATE_ORIG_1,\r |
25 | BCJ2_DEC_STATE_ORIG_2,\r |
26 | BCJ2_DEC_STATE_ORIG_3,\r |
27 | \r |
28 | BCJ2_DEC_STATE_ORIG,\r |
29 | BCJ2_DEC_STATE_OK\r |
30 | };\r |
31 | \r |
32 | enum\r |
33 | {\r |
34 | BCJ2_ENC_STATE_ORIG = BCJ2_NUM_STREAMS,\r |
35 | BCJ2_ENC_STATE_OK\r |
36 | };\r |
37 | \r |
38 | \r |
39 | #define BCJ2_IS_32BIT_STREAM(s) ((s) == BCJ2_STREAM_CALL || (s) == BCJ2_STREAM_JUMP)\r |
40 | \r |
41 | /*\r |
42 | CBcj2Dec / CBcj2Enc\r |
43 | bufs sizes:\r |
44 | BUF_SIZE(n) = lims[n] - bufs[n]\r |
45 | bufs sizes for BCJ2_STREAM_CALL and BCJ2_STREAM_JUMP must be mutliply of 4:\r |
46 | (BUF_SIZE(BCJ2_STREAM_CALL) & 3) == 0\r |
47 | (BUF_SIZE(BCJ2_STREAM_JUMP) & 3) == 0\r |
48 | */\r |
49 | \r |
50 | /*\r |
51 | CBcj2Dec:\r |
52 | dest is allowed to overlap with bufs[BCJ2_STREAM_MAIN], with the following conditions:\r |
53 | bufs[BCJ2_STREAM_MAIN] >= dest &&\r |
54 | bufs[BCJ2_STREAM_MAIN] - dest >= tempReserv +\r |
55 | BUF_SIZE(BCJ2_STREAM_CALL) +\r |
56 | BUF_SIZE(BCJ2_STREAM_JUMP)\r |
57 | tempReserv = 0 : for first call of Bcj2Dec_Decode\r |
58 | tempReserv = 4 : for any other calls of Bcj2Dec_Decode\r |
59 | overlap with offset = 1 is not allowed\r |
60 | */\r |
61 | \r |
62 | typedef struct\r |
63 | {\r |
64 | const Byte *bufs[BCJ2_NUM_STREAMS];\r |
65 | const Byte *lims[BCJ2_NUM_STREAMS];\r |
66 | Byte *dest;\r |
67 | const Byte *destLim;\r |
68 | \r |
69 | unsigned state; /* BCJ2_STREAM_MAIN has more priority than BCJ2_STATE_ORIG */\r |
70 | \r |
71 | UInt32 ip;\r |
72 | Byte temp[4];\r |
73 | UInt32 range;\r |
74 | UInt32 code;\r |
75 | UInt16 probs[2 + 256];\r |
76 | } CBcj2Dec;\r |
77 | \r |
78 | void Bcj2Dec_Init(CBcj2Dec *p);\r |
79 | \r |
80 | /* Returns: SZ_OK or SZ_ERROR_DATA */\r |
81 | SRes Bcj2Dec_Decode(CBcj2Dec *p);\r |
82 | \r |
83 | #define Bcj2Dec_IsFinished(_p_) ((_p_)->code == 0)\r |
84 | \r |
85 | \r |
86 | \r |
87 | typedef enum\r |
88 | {\r |
89 | BCJ2_ENC_FINISH_MODE_CONTINUE,\r |
90 | BCJ2_ENC_FINISH_MODE_END_BLOCK,\r |
91 | BCJ2_ENC_FINISH_MODE_END_STREAM\r |
92 | } EBcj2Enc_FinishMode;\r |
93 | \r |
94 | typedef struct\r |
95 | {\r |
96 | Byte *bufs[BCJ2_NUM_STREAMS];\r |
97 | const Byte *lims[BCJ2_NUM_STREAMS];\r |
98 | const Byte *src;\r |
99 | const Byte *srcLim;\r |
100 | \r |
101 | unsigned state;\r |
102 | EBcj2Enc_FinishMode finishMode;\r |
103 | \r |
104 | Byte prevByte;\r |
105 | \r |
106 | Byte cache;\r |
107 | UInt32 range;\r |
108 | UInt64 low;\r |
109 | UInt64 cacheSize;\r |
110 | \r |
111 | UInt32 ip;\r |
112 | \r |
113 | /* 32-bit ralative offset in JUMP/CALL commands is\r |
114 | - (mod 4 GB) in 32-bit mode\r |
115 | - signed Int32 in 64-bit mode\r |
116 | We use (mod 4 GB) check for fileSize.\r |
117 | Use fileSize up to 2 GB, if you want to support 32-bit and 64-bit code conversion. */\r |
118 | UInt32 fileIp;\r |
119 | UInt32 fileSize; /* (fileSize <= ((UInt32)1 << 31)), 0 means no_limit */\r |
120 | UInt32 relatLimit; /* (relatLimit <= ((UInt32)1 << 31)), 0 means desable_conversion */\r |
121 | \r |
122 | UInt32 tempTarget;\r |
123 | unsigned tempPos;\r |
124 | Byte temp[4 * 2];\r |
125 | \r |
126 | unsigned flushPos;\r |
127 | \r |
128 | UInt16 probs[2 + 256];\r |
129 | } CBcj2Enc;\r |
130 | \r |
131 | void Bcj2Enc_Init(CBcj2Enc *p);\r |
132 | void Bcj2Enc_Encode(CBcj2Enc *p);\r |
133 | \r |
134 | #define Bcj2Enc_Get_InputData_Size(p) ((SizeT)((p)->srcLim - (p)->src) + (p)->tempPos)\r |
135 | #define Bcj2Enc_IsFinished(p) ((p)->flushPos == 5)\r |
136 | \r |
137 | \r |
138 | #define BCJ2_RELAT_LIMIT_NUM_BITS 26\r |
139 | #define BCJ2_RELAT_LIMIT ((UInt32)1 << BCJ2_RELAT_LIMIT_NUM_BITS)\r |
140 | \r |
141 | /* limit for CBcj2Enc::fileSize variable */\r |
142 | #define BCJ2_FileSize_MAX ((UInt32)1 << 31)\r |
143 | \r |
144 | EXTERN_C_END\r |
145 | \r |
146 | #endif\r |