+++ /dev/null
-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-#ifndef __FILE_ABSTRACTION__
-#define __FILE_ABSTRACTION__
-
-
-#include <stdint.h>
-#include <string.h>
-#include <libkern/OSByteOrder.h>
-
-#ifdef __OPTIMIZE__
-#define INLINE __attribute__((always_inline))
-#else
-#define INLINE
-#endif
-
-//
-// This abstraction layer is for use with file formats that have 64-bit/32-bit and Big-Endian/Little-Endian variants
-//
-// For example: to make a utility that handles 32-bit little enidan files use: Pointer32<LittleEndian>
-//
-//
-// get16() read a 16-bit number from an E endian struct
-// set16() write a 16-bit number to an E endian struct
-// get32() read a 32-bit number from an E endian struct
-// set32() write a 32-bit number to an E endian struct
-// get64() read a 64-bit number from an E endian struct
-// set64() write a 64-bit number to an E endian struct
-//
-// getBits() read a bit field from an E endian struct (bitCount=number of bits in field, firstBit=bit index of field)
-// setBits() write a bit field to an E endian struct (bitCount=number of bits in field, firstBit=bit index of field)
-//
-// getBitsRaw() read a bit field from a struct with native endianness
-// setBitsRaw() write a bit field from a struct with native endianness
-//
-
-class BigEndian
-{
-public:
- static uint16_t get16(const uint16_t& from) INLINE { return OSReadBigInt16(&from, 0); }
- static void set16(uint16_t& into, uint16_t value) INLINE { OSWriteBigInt16(&into, 0, value); }
-
- static uint32_t get32(const uint32_t& from) INLINE { return OSReadBigInt32(&from, 0); }
- static void set32(uint32_t& into, uint32_t value) INLINE { OSWriteBigInt32(&into, 0, value); }
-
- static uint64_t get64(const uint64_t& from) INLINE { return OSReadBigInt64(&from, 0); }
- static void set64(uint64_t& into, uint64_t value) INLINE { OSWriteBigInt64(&into, 0, value); }
-
- static uint32_t getBits(const uint32_t& from,
- uint8_t firstBit, uint8_t bitCount) INLINE { return getBitsRaw(get32(from), firstBit, bitCount); }
- static void setBits(uint32_t& into, uint32_t value,
- uint8_t firstBit, uint8_t bitCount) INLINE { uint32_t temp = get32(into); setBitsRaw(temp, value, firstBit, bitCount); set32(into, temp); }
-
- static uint32_t getBitsRaw(const uint32_t& from,
- uint8_t firstBit, uint8_t bitCount) INLINE { return ((from >> (32-firstBit-bitCount)) & ((1<<bitCount)-1)); }
- static void setBitsRaw(uint32_t& into, uint32_t value,
- uint8_t firstBit, uint8_t bitCount) INLINE { uint32_t temp = into;
- const uint32_t mask = ((1<<bitCount)-1);
- temp &= ~(mask << (32-firstBit-bitCount));
- temp |= ((value & mask) << (32-firstBit-bitCount));
- into = temp; }
- enum { little_endian = 0 };
-};
-
-
-class LittleEndian
-{
-public:
- static uint16_t get16(const uint16_t& from) INLINE { return OSReadLittleInt16(&from, 0); }
- static void set16(uint16_t& into, uint16_t value) INLINE { OSWriteLittleInt16(&into, 0, value); }
-
- static uint32_t get32(const uint32_t& from) INLINE { return OSReadLittleInt32(&from, 0); }
- static void set32(uint32_t& into, uint32_t value) INLINE { OSWriteLittleInt32(&into, 0, value); }
-
- static uint64_t get64(const uint64_t& from) INLINE { return OSReadLittleInt64(&from, 0); }
- static void set64(uint64_t& into, uint64_t value) INLINE { OSWriteLittleInt64(&into, 0, value); }
-
- static uint32_t getBits(const uint32_t& from,
- uint8_t firstBit, uint8_t bitCount) INLINE { return getBitsRaw(get32(from), firstBit, bitCount); }
- static void setBits(uint32_t& into, uint32_t value,
- uint8_t firstBit, uint8_t bitCount) INLINE { uint32_t temp = get32(into); setBitsRaw(temp, value, firstBit, bitCount); set32(into, temp); }
-
- static uint32_t getBitsRaw(const uint32_t& from,
- uint8_t firstBit, uint8_t bitCount) INLINE { return ((from >> firstBit) & ((1<<bitCount)-1)); }
- static void setBitsRaw(uint32_t& into, uint32_t value,
- uint8_t firstBit, uint8_t bitCount) INLINE { uint32_t temp = into;
- const uint32_t mask = ((1<<bitCount)-1);
- temp &= ~(mask << firstBit);
- temp |= ((value & mask) << firstBit);
- into = temp; }
- enum { little_endian = 1 };
-};
-
-
-template <typename _E>
-class Pointer32
-{
-public:
- typedef uint32_t uint_t;
- typedef _E E;
-
- static uint64_t getP(const uint_t& from) INLINE { return _E::get32(from); }
- static void setP(uint_t& into, uint64_t value) INLINE { _E::set32(into, value); }
-};
-
-
-template <typename _E>
-class Pointer64
-{
-public:
- typedef uint64_t uint_t;
- typedef _E E;
-
- static uint64_t getP(const uint_t& from) INLINE { return _E::get64(from); }
- static void setP(uint_t& into, uint64_t value) INLINE { _E::set64(into, value); }
-};
-
-
-
-
-
-#endif // __FILE_ABSTRACTION__
-
-
projects / apple / ld64.git / blobdiff