| 1 | /* Bcj2Enc.c -- BCJ2 Encoder (Converter for x86 code)\r |
| 2 | 2014-11-10 : Igor Pavlov : Public domain */\r |
| 3 | \r |
| 4 | #include "Precomp.h"\r |
| 5 | \r |
| 6 | /* #define SHOW_STAT */\r |
| 7 | \r |
| 8 | #ifdef SHOW_STAT\r |
| 9 | #include <stdio.h>\r |
| 10 | #define PRF(x) x\r |
| 11 | #else\r |
| 12 | #define PRF(x)\r |
| 13 | #endif\r |
| 14 | \r |
| 15 | #include <windows.h>\r |
| 16 | #include <string.h>\r |
| 17 | \r |
| 18 | #include "Bcj2.h"\r |
| 19 | #include "CpuArch.h"\r |
| 20 | \r |
| 21 | #define CProb UInt16\r |
| 22 | \r |
| 23 | #define kTopValue ((UInt32)1 << 24)\r |
| 24 | #define kNumModelBits 11\r |
| 25 | #define kBitModelTotal (1 << kNumModelBits)\r |
| 26 | #define kNumMoveBits 5\r |
| 27 | \r |
| 28 | void Bcj2Enc_Init(CBcj2Enc *p)\r |
| 29 | {\r |
| 30 | unsigned i;\r |
| 31 | \r |
| 32 | p->state = BCJ2_ENC_STATE_OK;\r |
| 33 | p->finishMode = BCJ2_ENC_FINISH_MODE_CONTINUE;\r |
| 34 | \r |
| 35 | p->prevByte = 0;\r |
| 36 | \r |
| 37 | p->cache = 0;\r |
| 38 | p->range = 0xFFFFFFFF;\r |
| 39 | p->low = 0;\r |
| 40 | p->cacheSize = 1;\r |
| 41 | \r |
| 42 | p->ip = 0;\r |
| 43 | \r |
| 44 | p->fileIp = 0;\r |
| 45 | p->fileSize = 0;\r |
| 46 | p->relatLimit = BCJ2_RELAT_LIMIT;\r |
| 47 | \r |
| 48 | p->tempPos = 0;\r |
| 49 | \r |
| 50 | p->flushPos = 0;\r |
| 51 | \r |
| 52 | for (i = 0; i < sizeof(p->probs) / sizeof(p->probs[0]); i++)\r |
| 53 | p->probs[i] = kBitModelTotal >> 1;\r |
| 54 | }\r |
| 55 | \r |
| 56 | static Bool MY_FAST_CALL RangeEnc_ShiftLow(CBcj2Enc *p)\r |
| 57 | {\r |
| 58 | if ((UInt32)p->low < (UInt32)0xFF000000 || (UInt32)(p->low >> 32) != 0)\r |
| 59 | {\r |
| 60 | Byte *buf = p->bufs[BCJ2_STREAM_RC];\r |
| 61 | do\r |
| 62 | {\r |
| 63 | if (buf == p->lims[BCJ2_STREAM_RC])\r |
| 64 | {\r |
| 65 | p->state = BCJ2_STREAM_RC;\r |
| 66 | p->bufs[BCJ2_STREAM_RC] = buf;\r |
| 67 | return True;\r |
| 68 | }\r |
| 69 | *buf++ = (Byte)(p->cache + (Byte)(p->low >> 32));\r |
| 70 | p->cache = 0xFF;\r |
| 71 | }\r |
| 72 | while (--p->cacheSize);\r |
| 73 | p->bufs[BCJ2_STREAM_RC] = buf;\r |
| 74 | p->cache = (Byte)((UInt32)p->low >> 24);\r |
| 75 | }\r |
| 76 | p->cacheSize++;\r |
| 77 | p->low = (UInt32)p->low << 8;\r |
| 78 | return False;\r |
| 79 | }\r |
| 80 | \r |
| 81 | static void Bcj2Enc_Encode_2(CBcj2Enc *p)\r |
| 82 | {\r |
| 83 | if (BCJ2_IS_32BIT_STREAM(p->state))\r |
| 84 | {\r |
| 85 | Byte *cur = p->bufs[p->state];\r |
| 86 | if (cur == p->lims[p->state])\r |
| 87 | return;\r |
| 88 | SetBe32(cur, p->tempTarget);\r |
| 89 | p->bufs[p->state] = cur + 4;\r |
| 90 | }\r |
| 91 | \r |
| 92 | p->state = BCJ2_ENC_STATE_ORIG;\r |
| 93 | \r |
| 94 | for (;;)\r |
| 95 | {\r |
| 96 | if (p->range < kTopValue)\r |
| 97 | {\r |
| 98 | if (RangeEnc_ShiftLow(p))\r |
| 99 | return;\r |
| 100 | p->range <<= 8;\r |
| 101 | }\r |
| 102 | \r |
| 103 | {\r |
| 104 | {\r |
| 105 | const Byte *src = p->src;\r |
| 106 | const Byte *srcLim;\r |
| 107 | Byte *dest;\r |
| 108 | SizeT num = p->srcLim - src;\r |
| 109 | \r |
| 110 | if (p->finishMode == BCJ2_ENC_FINISH_MODE_CONTINUE)\r |
| 111 | {\r |
| 112 | if (num <= 4)\r |
| 113 | return;\r |
| 114 | num -= 4;\r |
| 115 | }\r |
| 116 | else if (num == 0)\r |
| 117 | break;\r |
| 118 | \r |
| 119 | dest = p->bufs[BCJ2_STREAM_MAIN];\r |
| 120 | if (num > (SizeT)(p->lims[BCJ2_STREAM_MAIN] - dest))\r |
| 121 | {\r |
| 122 | num = p->lims[BCJ2_STREAM_MAIN] - dest;\r |
| 123 | if (num == 0)\r |
| 124 | {\r |
| 125 | p->state = BCJ2_STREAM_MAIN;\r |
| 126 | return;\r |
| 127 | }\r |
| 128 | }\r |
| 129 | \r |
| 130 | srcLim = src + num;\r |
| 131 | \r |
| 132 | if (p->prevByte == 0x0F && (src[0] & 0xF0) == 0x80)\r |
| 133 | *dest = src[0];\r |
| 134 | else for (;;)\r |
| 135 | {\r |
| 136 | Byte b = *src;\r |
| 137 | *dest = b;\r |
| 138 | if (b != 0x0F)\r |
| 139 | {\r |
| 140 | if ((b & 0xFE) == 0xE8)\r |
| 141 | break;\r |
| 142 | dest++;\r |
| 143 | if (++src != srcLim)\r |
| 144 | continue;\r |
| 145 | break;\r |
| 146 | }\r |
| 147 | dest++;\r |
| 148 | if (++src == srcLim)\r |
| 149 | break;\r |
| 150 | if ((*src & 0xF0) != 0x80)\r |
| 151 | continue;\r |
| 152 | *dest = *src;\r |
| 153 | break;\r |
| 154 | }\r |
| 155 | \r |
| 156 | num = src - p->src;\r |
| 157 | \r |
| 158 | if (src == srcLim)\r |
| 159 | {\r |
| 160 | p->prevByte = src[-1];\r |
| 161 | p->bufs[BCJ2_STREAM_MAIN] = dest;\r |
| 162 | p->src = src;\r |
| 163 | p->ip += (UInt32)num;\r |
| 164 | continue;\r |
| 165 | }\r |
| 166 | \r |
| 167 | {\r |
| 168 | Byte context = (Byte)(num == 0 ? p->prevByte : src[-1]);\r |
| 169 | Bool needConvert;\r |
| 170 | \r |
| 171 | p->bufs[BCJ2_STREAM_MAIN] = dest + 1;\r |
| 172 | p->ip += (UInt32)num + 1;\r |
| 173 | src++;\r |
| 174 | \r |
| 175 | needConvert = False;\r |
| 176 | \r |
| 177 | if ((SizeT)(p->srcLim - src) >= 4)\r |
| 178 | {\r |
| 179 | UInt32 relatVal = GetUi32(src);\r |
| 180 | if ((p->fileSize == 0 || (UInt32)(p->ip + 4 + relatVal - p->fileIp) < p->fileSize)\r |
| 181 | && ((relatVal + p->relatLimit) >> 1) < p->relatLimit)\r |
| 182 | needConvert = True;\r |
| 183 | }\r |
| 184 | \r |
| 185 | {\r |
| 186 | UInt32 bound;\r |
| 187 | unsigned ttt;\r |
| 188 | Byte b = src[-1];\r |
| 189 | CProb *prob = p->probs + (unsigned)(b == 0xE8 ? 2 + (unsigned)context : (b == 0xE9 ? 1 : 0));\r |
| 190 | \r |
| 191 | ttt = *prob;\r |
| 192 | bound = (p->range >> kNumModelBits) * ttt;\r |
| 193 | \r |
| 194 | if (!needConvert)\r |
| 195 | {\r |
| 196 | p->range = bound;\r |
| 197 | *prob = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));\r |
| 198 | p->src = src;\r |
| 199 | p->prevByte = b;\r |
| 200 | continue;\r |
| 201 | }\r |
| 202 | \r |
| 203 | p->low += bound;\r |
| 204 | p->range -= bound;\r |
| 205 | *prob = (CProb)(ttt - (ttt >> kNumMoveBits));\r |
| 206 | \r |
| 207 | {\r |
| 208 | UInt32 relatVal = GetUi32(src);\r |
| 209 | UInt32 absVal;\r |
| 210 | p->ip += 4;\r |
| 211 | absVal = p->ip + relatVal;\r |
| 212 | p->prevByte = src[3];\r |
| 213 | src += 4;\r |
| 214 | p->src = src;\r |
| 215 | {\r |
| 216 | unsigned cj = (b == 0xE8) ? BCJ2_STREAM_CALL : BCJ2_STREAM_JUMP;\r |
| 217 | Byte *cur = p->bufs[cj];\r |
| 218 | if (cur == p->lims[cj])\r |
| 219 | {\r |
| 220 | p->state = cj;\r |
| 221 | p->tempTarget = absVal;\r |
| 222 | return;\r |
| 223 | }\r |
| 224 | SetBe32(cur, absVal);\r |
| 225 | p->bufs[cj] = cur + 4;\r |
| 226 | }\r |
| 227 | }\r |
| 228 | }\r |
| 229 | }\r |
| 230 | }\r |
| 231 | }\r |
| 232 | }\r |
| 233 | \r |
| 234 | if (p->finishMode != BCJ2_ENC_FINISH_MODE_END_STREAM)\r |
| 235 | return;\r |
| 236 | \r |
| 237 | for (; p->flushPos < 5; p->flushPos++)\r |
| 238 | if (RangeEnc_ShiftLow(p))\r |
| 239 | return;\r |
| 240 | p->state = BCJ2_ENC_STATE_OK;\r |
| 241 | }\r |
| 242 | \r |
| 243 | \r |
| 244 | void Bcj2Enc_Encode(CBcj2Enc *p)\r |
| 245 | {\r |
| 246 | PRF(printf("\n"));\r |
| 247 | PRF(printf("---- ip = %8d tempPos = %8d src = %8d\n", p->ip, p->tempPos, p->srcLim - p->src));\r |
| 248 | \r |
| 249 | if (p->tempPos != 0)\r |
| 250 | {\r |
| 251 | unsigned extra = 0;\r |
| 252 | \r |
| 253 | for (;;)\r |
| 254 | {\r |
| 255 | const Byte *src = p->src;\r |
| 256 | const Byte *srcLim = p->srcLim;\r |
| 257 | unsigned finishMode = p->finishMode;\r |
| 258 | \r |
| 259 | p->src = p->temp;\r |
| 260 | p->srcLim = p->temp + p->tempPos;\r |
| 261 | if (src != srcLim)\r |
| 262 | p->finishMode = BCJ2_ENC_FINISH_MODE_CONTINUE;\r |
| 263 | \r |
| 264 | PRF(printf(" ip = %8d tempPos = %8d src = %8d\n", p->ip, p->tempPos, p->srcLim - p->src));\r |
| 265 | \r |
| 266 | Bcj2Enc_Encode_2(p);\r |
| 267 | \r |
| 268 | {\r |
| 269 | unsigned num = (unsigned)(p->src - p->temp);\r |
| 270 | unsigned tempPos = p->tempPos - num;\r |
| 271 | unsigned i;\r |
| 272 | p->tempPos = tempPos;\r |
| 273 | for (i = 0; i < tempPos; i++)\r |
| 274 | p->temp[i] = p->temp[i + num];\r |
| 275 | \r |
| 276 | p->src = src;\r |
| 277 | p->srcLim = srcLim;\r |
| 278 | p->finishMode = finishMode;\r |
| 279 | \r |
| 280 | if (p->state != BCJ2_ENC_STATE_ORIG || src == srcLim)\r |
| 281 | return;\r |
| 282 | \r |
| 283 | if (extra >= tempPos)\r |
| 284 | {\r |
| 285 | p->src = src - tempPos;\r |
| 286 | p->tempPos = 0;\r |
| 287 | break;\r |
| 288 | }\r |
| 289 | \r |
| 290 | p->temp[tempPos] = src[0];\r |
| 291 | p->tempPos = tempPos + 1;\r |
| 292 | p->src = src + 1;\r |
| 293 | extra++;\r |
| 294 | }\r |
| 295 | }\r |
| 296 | }\r |
| 297 | \r |
| 298 | PRF(printf("++++ ip = %8d tempPos = %8d src = %8d\n", p->ip, p->tempPos, p->srcLim - p->src));\r |
| 299 | \r |
| 300 | Bcj2Enc_Encode_2(p);\r |
| 301 | \r |
| 302 | if (p->state == BCJ2_ENC_STATE_ORIG)\r |
| 303 | {\r |
| 304 | const Byte *src = p->src;\r |
| 305 | unsigned rem = (unsigned)(p->srcLim - src);\r |
| 306 | unsigned i;\r |
| 307 | for (i = 0; i < rem; i++)\r |
| 308 | p->temp[i] = src[i];\r |
| 309 | p->tempPos = rem;\r |
| 310 | p->src = src + rem;\r |
| 311 | }\r |
| 312 | }\r |