1 | //===- llvm/Support/LEB128.h - [SU]LEB128 utility functions -----*- C++ -*-===// |
2 | // |
3 | // The LLVM Compiler Infrastructure |
4 | // |
5 | // This file is distributed under the University of Illinois Open Source |
6 | // License. See LICENSE.TXT for details. |
7 | // |
8 | //===----------------------------------------------------------------------===// |
9 | // |
10 | // This file declares some utility functions for encoding SLEB128 and |
11 | // ULEB128 values. |
12 | // |
13 | //===----------------------------------------------------------------------===// |
14 | |
15 | /* Capstone Disassembly Engine */ |
16 | /* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013-2014 */ |
17 | |
18 | #ifndef CS_LLVM_SUPPORT_LEB128_H |
19 | #define CS_LLVM_SUPPORT_LEB128_H |
20 | |
21 | #if !defined(_MSC_VER) || !defined(_KERNEL_MODE) |
22 | #include <stdint.h> |
23 | #endif |
24 | |
25 | /// Utility function to decode a ULEB128 value. |
26 | static inline uint64_t decodeULEB128(const uint8_t *p, unsigned *n) |
27 | { |
28 | const uint8_t *orig_p = p; |
29 | uint64_t Value = 0; |
30 | unsigned Shift = 0; |
31 | do { |
32 | Value += (*p & 0x7f) << Shift; |
33 | Shift += 7; |
34 | } while (*p++ >= 128); |
35 | if (n) |
36 | *n = (unsigned)(p - orig_p); |
37 | return Value; |
38 | } |
39 | |
40 | #endif // LLVM_SYSTEM_LEB128_H |
41 | |