if(!str) len = 6; /* Maximum we will need */
else if(len <= 0) return -1;
if(value < 0x80) {
- if(str) *str = value;
+ if(str) *str = (unsigned char)value;
return 1;
}
if(value < 0x800) {
if(len < 2) return -1;
if(str) {
- *str++ = ((value >> 6) & 0x1f) | 0xc0;
- *str = (value & 0x3f) | 0x80;
+ *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
+ *str = (unsigned char)((value & 0x3f) | 0x80);
}
return 2;
}
if(value < 0x10000) {
if(len < 3) return -1;
if(str) {
- *str++ = ((value >> 12) & 0xf) | 0xe0;
- *str++ = ((value >> 6) & 0x3f) | 0x80;
- *str = (value & 0x3f) | 0x80;
+ *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
+ *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
+ *str = (unsigned char)((value & 0x3f) | 0x80);
}
return 3;
}
if(value < 0x200000) {
if(len < 4) return -1;
if(str) {
- *str++ = ((value >> 18) & 0x7) | 0xf0;
- *str++ = ((value >> 12) & 0x3f) | 0x80;
- *str++ = ((value >> 6) & 0x3f) | 0x80;
- *str = (value & 0x3f) | 0x80;
+ *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
+ *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
+ *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
+ *str = (unsigned char)((value & 0x3f) | 0x80);
}
return 4;
}
if(value < 0x4000000) {
if(len < 5) return -1;
if(str) {
- *str++ = ((value >> 24) & 0x3) | 0xf8;
- *str++ = ((value >> 18) & 0x3f) | 0x80;
- *str++ = ((value >> 12) & 0x3f) | 0x80;
- *str++ = ((value >> 6) & 0x3f) | 0x80;
- *str = (value & 0x3f) | 0x80;
+ *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
+ *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
+ *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
+ *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
+ *str = (unsigned char)((value & 0x3f) | 0x80);
}
return 5;
}
if(len < 6) return -1;
if(str) {
- *str++ = ((value >> 30) & 0x1) | 0xfc;
- *str++ = ((value >> 24) & 0x3f) | 0x80;
- *str++ = ((value >> 18) & 0x3f) | 0x80;
- *str++ = ((value >> 12) & 0x3f) | 0x80;
- *str++ = ((value >> 6) & 0x3f) | 0x80;
- *str = (value & 0x3f) | 0x80;
+ *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
+ *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
+ *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
+ *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
+ *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
+ *str = (unsigned char)((value & 0x3f) | 0x80);
}
return 6;
}