diff options
Diffstat (limited to 'other-licenses/7zstub/src/C/Bcj2Enc.c')
| -rw-r--r-- | other-licenses/7zstub/src/C/Bcj2Enc.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/C/Bcj2Enc.c b/other-licenses/7zstub/src/C/Bcj2Enc.c new file mode 100644 index 000000000..b0bc7593d --- /dev/null +++ b/other-licenses/7zstub/src/C/Bcj2Enc.c @@ -0,0 +1,311 @@ +/* Bcj2Enc.c -- BCJ2 Encoder (Converter for x86 code)
+2017-04-28 : Igor Pavlov : Public domain */
+
+#include "Precomp.h"
+
+/* #define SHOW_STAT */
+
+#ifdef SHOW_STAT
+#include <stdio.h>
+#define PRF(x) x
+#else
+#define PRF(x)
+#endif
+
+#include <string.h>
+
+#include "Bcj2.h"
+#include "CpuArch.h"
+
+#define CProb UInt16
+
+#define kTopValue ((UInt32)1 << 24)
+#define kNumModelBits 11
+#define kBitModelTotal (1 << kNumModelBits)
+#define kNumMoveBits 5
+
+void Bcj2Enc_Init(CBcj2Enc *p)
+{
+ unsigned i;
+
+ p->state = BCJ2_ENC_STATE_OK;
+ p->finishMode = BCJ2_ENC_FINISH_MODE_CONTINUE;
+
+ p->prevByte = 0;
+
+ p->cache = 0;
+ p->range = 0xFFFFFFFF;
+ p->low = 0;
+ p->cacheSize = 1;
+
+ p->ip = 0;
+
+ p->fileIp = 0;
+ p->fileSize = 0;
+ p->relatLimit = BCJ2_RELAT_LIMIT;
+
+ p->tempPos = 0;
+
+ p->flushPos = 0;
+
+ for (i = 0; i < sizeof(p->probs) / sizeof(p->probs[0]); i++)
+ p->probs[i] = kBitModelTotal >> 1;
+}
+
+static Bool MY_FAST_CALL RangeEnc_ShiftLow(CBcj2Enc *p)
+{
+ if ((UInt32)p->low < (UInt32)0xFF000000 || (UInt32)(p->low >> 32) != 0)
+ {
+ Byte *buf = p->bufs[BCJ2_STREAM_RC];
+ do
+ {
+ if (buf == p->lims[BCJ2_STREAM_RC])
+ {
+ p->state = BCJ2_STREAM_RC;
+ p->bufs[BCJ2_STREAM_RC] = buf;
+ return True;
+ }
+ *buf++ = (Byte)(p->cache + (Byte)(p->low >> 32));
+ p->cache = 0xFF;
+ }
+ while (--p->cacheSize);
+ p->bufs[BCJ2_STREAM_RC] = buf;
+ p->cache = (Byte)((UInt32)p->low >> 24);
+ }
+ p->cacheSize++;
+ p->low = (UInt32)p->low << 8;
+ return False;
+}
+
+static void Bcj2Enc_Encode_2(CBcj2Enc *p)
+{
+ if (BCJ2_IS_32BIT_STREAM(p->state))
+ {
+ Byte *cur = p->bufs[p->state];
+ if (cur == p->lims[p->state])
+ return;
+ SetBe32(cur, p->tempTarget);
+ p->bufs[p->state] = cur + 4;
+ }
+
+ p->state = BCJ2_ENC_STATE_ORIG;
+
+ for (;;)
+ {
+ if (p->range < kTopValue)
+ {
+ if (RangeEnc_ShiftLow(p))
+ return;
+ p->range <<= 8;
+ }
+
+ {
+ {
+ const Byte *src = p->src;
+ const Byte *srcLim;
+ Byte *dest;
+ SizeT num = p->srcLim - src;
+
+ if (p->finishMode == BCJ2_ENC_FINISH_MODE_CONTINUE)
+ {
+ if (num <= 4)
+ return;
+ num -= 4;
+ }
+ else if (num == 0)
+ break;
+
+ dest = p->bufs[BCJ2_STREAM_MAIN];
+ if (num > (SizeT)(p->lims[BCJ2_STREAM_MAIN] - dest))
+ {
+ num = p->lims[BCJ2_STREAM_MAIN] - dest;
+ if (num == 0)
+ {
+ p->state = BCJ2_STREAM_MAIN;
+ return;
+ }
+ }
+
+ srcLim = src + num;
+
+ if (p->prevByte == 0x0F && (src[0] & 0xF0) == 0x80)
+ *dest = src[0];
+ else for (;;)
+ {
+ Byte b = *src;
+ *dest = b;
+ if (b != 0x0F)
+ {
+ if ((b & 0xFE) == 0xE8)
+ break;
+ dest++;
+ if (++src != srcLim)
+ continue;
+ break;
+ }
+ dest++;
+ if (++src == srcLim)
+ break;
+ if ((*src & 0xF0) != 0x80)
+ continue;
+ *dest = *src;
+ break;
+ }
+
+ num = src - p->src;
+
+ if (src == srcLim)
+ {
+ p->prevByte = src[-1];
+ p->bufs[BCJ2_STREAM_MAIN] = dest;
+ p->src = src;
+ p->ip += (UInt32)num;
+ continue;
+ }
+
+ {
+ Byte context = (Byte)(num == 0 ? p->prevByte : src[-1]);
+ Bool needConvert;
+
+ p->bufs[BCJ2_STREAM_MAIN] = dest + 1;
+ p->ip += (UInt32)num + 1;
+ src++;
+
+ needConvert = False;
+
+ if ((SizeT)(p->srcLim - src) >= 4)
+ {
+ UInt32 relatVal = GetUi32(src);
+ if ((p->fileSize == 0 || (UInt32)(p->ip + 4 + relatVal - p->fileIp) < p->fileSize)
+ && ((relatVal + p->relatLimit) >> 1) < p->relatLimit)
+ needConvert = True;
+ }
+
+ {
+ UInt32 bound;
+ unsigned ttt;
+ Byte b = src[-1];
+ CProb *prob = p->probs + (unsigned)(b == 0xE8 ? 2 + (unsigned)context : (b == 0xE9 ? 1 : 0));
+
+ ttt = *prob;
+ bound = (p->range >> kNumModelBits) * ttt;
+
+ if (!needConvert)
+ {
+ p->range = bound;
+ *prob = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));
+ p->src = src;
+ p->prevByte = b;
+ continue;
+ }
+
+ p->low += bound;
+ p->range -= bound;
+ *prob = (CProb)(ttt - (ttt >> kNumMoveBits));
+
+ {
+ UInt32 relatVal = GetUi32(src);
+ UInt32 absVal;
+ p->ip += 4;
+ absVal = p->ip + relatVal;
+ p->prevByte = src[3];
+ src += 4;
+ p->src = src;
+ {
+ unsigned cj = (b == 0xE8) ? BCJ2_STREAM_CALL : BCJ2_STREAM_JUMP;
+ Byte *cur = p->bufs[cj];
+ if (cur == p->lims[cj])
+ {
+ p->state = cj;
+ p->tempTarget = absVal;
+ return;
+ }
+ SetBe32(cur, absVal);
+ p->bufs[cj] = cur + 4;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ if (p->finishMode != BCJ2_ENC_FINISH_MODE_END_STREAM)
+ return;
+
+ for (; p->flushPos < 5; p->flushPos++)
+ if (RangeEnc_ShiftLow(p))
+ return;
+ p->state = BCJ2_ENC_STATE_OK;
+}
+
+
+void Bcj2Enc_Encode(CBcj2Enc *p)
+{
+ PRF(printf("\n"));
+ PRF(printf("---- ip = %8d tempPos = %8d src = %8d\n", p->ip, p->tempPos, p->srcLim - p->src));
+
+ if (p->tempPos != 0)
+ {
+ unsigned extra = 0;
+
+ for (;;)
+ {
+ const Byte *src = p->src;
+ const Byte *srcLim = p->srcLim;
+ unsigned finishMode = p->finishMode;
+
+ p->src = p->temp;
+ p->srcLim = p->temp + p->tempPos;
+ if (src != srcLim)
+ p->finishMode = BCJ2_ENC_FINISH_MODE_CONTINUE;
+
+ PRF(printf(" ip = %8d tempPos = %8d src = %8d\n", p->ip, p->tempPos, p->srcLim - p->src));
+
+ Bcj2Enc_Encode_2(p);
+
+ {
+ unsigned num = (unsigned)(p->src - p->temp);
+ unsigned tempPos = p->tempPos - num;
+ unsigned i;
+ p->tempPos = tempPos;
+ for (i = 0; i < tempPos; i++)
+ p->temp[i] = p->temp[(size_t)i + num];
+
+ p->src = src;
+ p->srcLim = srcLim;
+ p->finishMode = finishMode;
+
+ if (p->state != BCJ2_ENC_STATE_ORIG || src == srcLim)
+ return;
+
+ if (extra >= tempPos)
+ {
+ p->src = src - tempPos;
+ p->tempPos = 0;
+ break;
+ }
+
+ p->temp[tempPos] = src[0];
+ p->tempPos = tempPos + 1;
+ p->src = src + 1;
+ extra++;
+ }
+ }
+ }
+
+ PRF(printf("++++ ip = %8d tempPos = %8d src = %8d\n", p->ip, p->tempPos, p->srcLim - p->src));
+
+ Bcj2Enc_Encode_2(p);
+
+ if (p->state == BCJ2_ENC_STATE_ORIG)
+ {
+ const Byte *src = p->src;
+ unsigned rem = (unsigned)(p->srcLim - src);
+ unsigned i;
+ for (i = 0; i < rem; i++)
+ p->temp[i] = src[i];
+ p->tempPos = rem;
+ p->src = src + rem;
+ }
+}
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