+/// Utility function to encode a ULEB128 value to a buffer. Returns
+/// the length in bytes of the encoded value.
+inline unsigned encodeULEB128(uint64_t Value, uint8_t *p,
+ unsigned Padding = 0) {
+ uint8_t *orig_p = p;
+ do {
+ uint8_t Byte = Value & 0x7f;
+ Value >>= 7;
+ if (Value != 0 || Padding != 0)
+ Byte |= 0x80; // Mark this byte to show that more bytes will follow.
+ *p++ = Byte;
+ } while (Value != 0);
+
+ // Pad with 0x80 and emit a null byte at the end.
+ if (Padding != 0) {
+ for (; Padding != 1; --Padding)
+ *p++ = '\x80';
+ *p++ = '\x00';
+ }
+ return (unsigned)(p - orig_p);
+}
+
+
+/// Utility function to decode a ULEB128 value.
+inline uint64_t decodeULEB128(const uint8_t *p, unsigned *n = nullptr) {
+ const uint8_t *orig_p = p;
+ uint64_t Value = 0;
+ unsigned Shift = 0;
+ do {
+ Value += uint64_t(*p & 0x7f) << Shift;
+ Shift += 7;
+ } while (*p++ >= 128);
+ if (n)
+ *n = (unsigned)(p - orig_p);
+ return Value;
+}
+
+/// Utility function to decode a SLEB128 value.
+inline int64_t decodeSLEB128(const uint8_t *p, unsigned *n = nullptr) {
+ const uint8_t *orig_p = p;
+ int64_t Value = 0;
+ unsigned Shift = 0;
+ uint8_t Byte;
+ do {
+ Byte = *p++;
+ Value |= ((Byte & 0x7f) << Shift);
+ Shift += 7;
+ } while (Byte >= 128);
+ // Sign extend negative numbers.
+ if (Byte & 0x40)
+ Value |= (-1ULL) << Shift;
+ if (n)
+ *n = (unsigned)(p - orig_p);
+ return Value;
+}
+
+
+/// Utility function to get the size of the ULEB128-encoded value.
+extern unsigned getULEB128Size(uint64_t Value);
+
+/// Utility function to get the size of the SLEB128-encoded value.
+extern unsigned getSLEB128Size(int64_t Value);
+