1 /*- 2 * Copyright (c) 2013 David Chisnall 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 #ifndef _UTIL_HH_ 34 #define _UTIL_HH_ 35 36 #include <vector> 37 38 // If we aren't using C++11, then just ignore static asserts. 39 #if __cplusplus < 201103L 40 #ifndef static_assert 41 #define static_assert(x, y) ((void)0) 42 #endif 43 #endif 44 45 namespace dtc { 46 47 /** 48 * Type for a buffer of bytes. This is used for a lot of short-lived temporary 49 * variables, so may eventually be changed to something like LLVM's 50 * SmallVector, but currently the program runs in a tiny fraction of a second, 51 * so this is not an issue. 52 */ 53 typedef std::vector<uint8_t> byte_buffer; 54 55 /** 56 * Helper function to push a big endian value into a byte buffer. We use 57 * native-endian values for all of the in-memory data structures and only 58 * transform them into big endian form for output. 59 */ 60 template<typename T> 61 inline void push_big_endian(byte_buffer &v, T val) 62 { 63 static_assert(sizeof(T) > 1, 64 "Big endian doesn't make sense for single-byte values"); 65 for (int bit=(sizeof(T) - 1)*8 ; bit>=0 ; bit-= 8) 66 { 67 v.push_back((val >> bit) & 0xff); 68 } 69 } 70 71 /** 72 * Simple inline non-locale-aware check that this is a valid ASCII 73 * digit. 74 */ 75 inline bool isdigit(char c) 76 { 77 return (c >= '0') && (c <= '9'); 78 } 79 80 /** 81 * Simple inline non-locale-aware check that this is a valid ASCII 82 * hex digit. 83 */ 84 inline bool ishexdigit(char c) 85 { 86 return ((c >= '0') && (c <= '9')) || ((c >= 'a') && (c <= 'f')) || 87 ((c >= 'A') && (c <= 'Z')); 88 } 89 90 }// namespace dtc 91 92 #endif // !_UTIL_HH_ 93