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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
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/*-
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* Copyright (c) 2013 David Chisnall
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _UTIL_HH_
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#define _UTIL_HH_
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#include <vector>
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// If we aren't using C++11, then just ignore static asserts.
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#if __cplusplus < 201103L
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#ifndef static_assert
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#define static_assert(x, y) ((void)0)
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#endif
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#endif
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namespace dtc {
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/**
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* Type for a buffer of bytes. This is used for a lot of short-lived temporary
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* variables, so may eventually be changed to something like LLVM's
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* SmallVector, but currently the program runs in a tiny fraction of a second,
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* so this is not an issue.
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*/
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typedef std::vector<uint8_t> byte_buffer;
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/**
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* Helper function to push a big endian value into a byte buffer. We use
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* native-endian values for all of the in-memory data structures and only
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* transform them into big endian form for output.
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*/
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template<typename T>
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inline void push_big_endian(byte_buffer &v, T val)
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{
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static_assert(sizeof(T) > 1,
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"Big endian doesn't make sense for single-byte values");
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for (int bit=(sizeof(T) - 1)*8 ; bit>=0 ; bit-= 8)
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{
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v.push_back((val >> bit) & 0xff);
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}
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}
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/**
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* Simple inline non-locale-aware check that this is a valid ASCII
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* digit.
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*/
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inline bool isdigit(char c)
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{
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return (c >= '0') && (c <= '9');
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}
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/**
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* Simple inline non-locale-aware check that this is a valid ASCII
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* hex digit.
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*/
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inline bool ishexdigit(char c)
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{
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return ((c >= '0') && (c <= '9')) || ((c >= 'a') && (c <= 'f')) ||
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((c >= 'A') && (c <= 'Z'));
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}
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}// namespace dtc
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#endif // !_UTIL_HH_
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