/* Chordata - .NET File Format Parser
 * Copyright (C) 2001-2002  Jay Freeman (saurik)
*/

/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef CHORDATA_UTILS_H
#define CHORDATA_UTILS_H

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "chordata/Flags.h"
#include "chordata/Signature.h"
#include "chordata/Tokens.h"

namespace Chordata {
namespace Utils {

template <typename Type>
inline Type Uncompress(const uint8_t * &ptr) {
	const char *name = (const char *) ptr;
	if ((*ptr & 0xE0) == 0xE0) {
		Type len;
		exit(1);
		ptr += 4;
		return len;
	} else if ((*ptr & 0xC0) == 0xC0) {
		Type len;
		exit(1);
		ptr += 3;
		return len;
	} else if ((*ptr & 0x80) == 0x80) {
		Type len = (Type) ((ptr[0] & ~0x80) << 8 | ptr[1]);
		ptr += 2;
		return len;
	} else
		return (Type) *(ptr++);
}

inline Chordata::Token DecodeToken(uint32_t token) {
	switch (token & 3) {
		case 0: return (token >> 2) | Tokens::mdtTypeDef;
		case 1: return (token >> 2) | Tokens::mdtTypeRef;
		case 2: return (token >> 2) | Tokens::mdtTypeSpec;
		default: return (token >> 2) | 0;
	}
}

inline Tokens::CorTokenType GetTokenType(Token token) {
	return (Tokens::CorTokenType) (token & 0xFF000000);
}

inline bool TokenIsNil(Token token) {
	return (token & 0x00FFFFFF) == 0;
}

inline bool IsPrimitive(Element::Type type) {
	return type < Element::Ptr;
}

inline bool IsCallingConvention(uint32_t flags, Chordata::Flags::CallingConvention::CorCallingConvention convention) {
	return (flags & Chordata::Flags::CallingConvention::Mask) == (uint32_t) convention;
}

} }

#endif//CHORDATA_UTILS_H