添加lzw压缩算法

other/crc.c

@@ -0,0 +1,109 @@
+#include "crc.h"
+
+
+
+
+
+
+
+uint8_t crc_crc8(const uint8_t *data,int num)
+{
+  uint8_t crc = 0;
+  uint16_t j,i;
+  for (j = 0; j < num; j++)
+  {
+    crc ^= *(data+j);
+    for ( i = 0; i < 8; i++)
+    {
+      if ((crc & 0x01) != 0)
+      {
+        crc >>= 1;
+        crc ^= 0x8c;
+      }
+      else
+      {
+        crc >>= 1;
+      }
+    }
+  }
+  return crc;
+}
+
+
+
+
+
+void crc_crc16(const uint8_t *data, int len,uint8_t *lb,uint8_t *hb)
+{
+  if (len > 0)
+  {
+    uint16_t crc = 0xFFFF;
+    int i = 0;
+    for (; i < len; i++)
+    {
+      crc = (uint16_t)(crc ^ (data[i]));
+      for (int j = 0; j < 8; j++)
+      {
+        crc = (crc & 1) != 0 ? (uint16_t)((crc >> 1) ^ 0xA001) : (uint16_t)(crc >> 1);
+      }
+    }
+    uint8_t hi = (uint8_t)((crc & 0xFF00) >> 8); //高位置
+    uint8_t lo = (uint8_t)(crc & 0x00FF); //低位置
+    *lb=lo;*hb=hi;
+  }
+}
+
+
+
+uint32_t crc_crc32(const uint8_t *data,int size)
+{
+  uint32_t temp,crc=0xffffffff;
+  int i=0,j=0;
+  if((size%4)!=0)
+  {
+    return 0;
+  }
+  while(i<size)
+  {
+    temp=data[i]|(data[i+1]<<8)|(data[i+2]<<16)|(data[i+3]<<24);
+    i+=4;
+    for(j=0;j<32;j++)
+    {
+      if((crc^temp)&0x80000000)
+        crc=0x04c11db7^(crc<<1);
+      else
+        crc<<=1;
+      temp<<=1;
+    }
+    crc&=0xffffffff;
+  }
+  return crc;
+}
+
+
+
+
+
+void crc_sumcheck(const uint8_t *data,int size,uint8_t *chka,uint8_t *chkb) 
+{
+  if(chka==0) return;
+  if(chkb==0) return;
+  *chka=0;
+  *chkb=0;
+	for(int i=0;i<size;i++)
+	{
+		*chka+=data[i];
+		*chkb+=*chka;
+	}
+}
+
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