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        #include "git-compat-util.h"
      
        #include "varint.h"
      
        uintmax_t decode_varint(const unsigned char **bufp)
      
        {
      
        	const unsigned char *buf = *bufp;
      
        	unsigned char c = *buf++;
      
        	uintmax_t val = c & 127;
      
        	while (c & 128) {
      
        		val += 1;
      
        		if (!val || MSB(val, 7))
      
        			return 0; /* overflow */
      
        		c = *buf++;
      
        		val = (val << 7) + (c & 127);
      
        	}
      
        	*bufp = buf;
      
        	return val;
      
        }
      
        int encode_varint(uintmax_t value, unsigned char *buf)
      
        {
      
        	unsigned char varint[16];
      
        	unsigned pos = sizeof(varint) - 1;
      
        	varint[pos] = value & 127;
      
        	while (value >>= 7)
      
        		varint[--pos] = 128 | (--value & 127);
      
        	if (buf)
      
        		memcpy(buf, varint + pos, sizeof(varint) - pos);
      
        	return sizeof(varint) - pos;
      
        }