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ext/miniupnpc/codelength.h

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+/* $Id: codelength.h,v 1.5 2015/07/09 12:40:18 nanard Exp $ */
+/* Project : miniupnp
+ * Author : Thomas BERNARD
+ * copyright (c) 2005-2015 Thomas Bernard
+ * This software is subjet to the conditions detailed in the
+ * provided LICENCE file. */
+#ifndef CODELENGTH_H_INCLUDED
+#define CODELENGTH_H_INCLUDED
+
+/* Encode length by using 7bit per Byte :
+ * Most significant bit of each byte specifies that the
+ * following byte is part of the code */
+
+/* n : unsigned
+ * p : unsigned char *
+ */
+#define DECODELENGTH(n, p) n = 0; \
+                           do { n = (n << 7) | (*p & 0x7f); } \
+                           while((*(p++)&0x80) && (n<(1<<25)));
+
+/* n :    unsigned
+ * READ : function/macro to read one byte (unsigned char)
+ */
+#define DECODELENGTH_READ(n, READ) \
+	n = 0; \
+	do { \
+		unsigned char c; \
+		READ(c); \
+		n = (n << 7) | (c & 0x07f); \
+		if(!(c&0x80)) break; \
+	} while(n<(1<<25));
+
+/* n :       unsigned
+ * p :       unsigned char *
+ * p_limit : unsigned char *
+ */
+#define DECODELENGTH_CHECKLIMIT(n, p, p_limit) \
+	n = 0; \
+	do { \
+		if((p) >= (p_limit)) break; \
+		n = (n << 7) | (*(p) & 0x7f); \
+	} while((*((p)++)&0x80) && (n<(1<<25)));
+
+
+/* n : unsigned
+ * p : unsigned char *
+ */
+#define CODELENGTH(n, p) if(n>=268435456) *(p++) = (n >> 28) | 0x80; \
+                         if(n>=2097152) *(p++) = (n >> 21) | 0x80; \
+                         if(n>=16384) *(p++) = (n >> 14) | 0x80; \
+                         if(n>=128) *(p++) = (n >> 7) | 0x80; \
+                         *(p++) = n & 0x7f;
+
+#endif /* CODELENGTH_H_INCLUDED */