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dpavlin |
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/* |
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* HT Editor |
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* endianess.cc |
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* |
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* Copyright (C) 1999-2002 Stefan Weyergraf |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include <cstring> |
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#include "debug.h" |
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#include "endianess.h" |
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#include "system/types.h" |
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extern "C" void createForeignInt(void *buf, int i, int size, Endianess to_endianess) |
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{ |
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uint8 *b = (uint8*)buf; |
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switch (size) { |
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case 1: b[0] = i; break; |
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case 2: |
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switch (to_endianess) { |
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case big_endian: |
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b[0] = i>>8; |
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b[1] = i; |
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break; |
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case little_endian: |
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b[0] = i; |
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b[1] = i>>8; |
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break; |
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} |
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break; |
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case 4: |
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switch (to_endianess) { |
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case big_endian: |
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b[0] = i>>24; |
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b[1] = i>>16; |
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b[2] = i>>8; |
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b[3] = i; |
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break; |
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case little_endian: |
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b[0] = i; |
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b[1] = i>>8; |
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b[2] = i>>16; |
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b[3] = i>>24; |
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break; |
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} |
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break; |
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default: ASSERT(0); |
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} |
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} |
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extern "C" int createHostInt(const void *buf, int size, Endianess from_endianess) |
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{ |
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uint8 *b = (uint8*)buf; |
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switch (size) { |
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case 1: |
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return b[0]; |
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case 2: |
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switch (from_endianess) { |
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case big_endian: |
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return (b[0]<<8) | b[1]; |
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case little_endian: |
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return (b[1]<<8) | b[0]; |
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} |
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break; |
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case 4: |
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switch (from_endianess) { |
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case big_endian: |
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return (b[0]<<24) | (b[1]<<16) | (b[2]<<8) | b[3]; |
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case little_endian: |
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return (b[3]<<24) | (b[2]<<16) | (b[1]<<8) | b[0]; |
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} |
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break; |
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} |
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ASSERT(0); |
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return 0; |
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} |
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extern "C" void createForeignInt64(void *buf, uint64 i, int size, Endianess to_endianess) |
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{ |
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if (size <= 4) { |
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return createForeignInt(buf, i, size, to_endianess); |
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} |
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uint8 *b = (uint8*)buf; |
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uint32 hi = i >> 32; |
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uint32 lo = i; |
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switch (to_endianess) { |
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case big_endian: |
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b[0] = hi>>24; |
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b[1] = hi>>16; |
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b[2] = hi>>8; |
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b[3] = hi; |
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b[4] = lo>>24; |
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b[5] = lo>>16; |
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b[6] = lo>>8; |
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b[7] = lo; |
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break; |
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case little_endian: |
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b[0] = lo; |
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b[1] = lo>>8; |
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b[2] = lo>>16; |
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b[3] = lo>>24; |
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b[4] = hi; |
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b[5] = hi>>8; |
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b[6] = hi>>16; |
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b[7] = hi>>24; |
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break; |
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default: ASSERT(0); |
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} |
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} |
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extern "C" uint64 createHostInt64(const void *buf, int size, Endianess from_endianess) |
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{ |
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if (size <= 4) { |
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return createHostInt(buf, size, from_endianess); |
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} |
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uint8 *b = (uint8*)buf; |
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uint64 q; |
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switch (from_endianess) { |
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case big_endian: |
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q = (((uint64)(b[0]<<24) | (b[1]<<16) | (b[2]<<8) | b[3]) << 32) | |
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(b[4]<<24) | (b[5]<<16) | (b[6]<<8) | b[7]; |
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break; |
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case little_endian: |
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q = (((uint64)(b[7]<<24) | (b[6]<<16) | (b[5]<<8) | b[4]) << 32) | |
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(b[3]<<24) | (b[2]<<16) | (b[1]<<8) | b[0]; |
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default: ASSERT(0); |
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} |
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return q; |
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} |
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extern "C" void createHostStructx(void *buf, uint bufsize, const uint8 *table, Endianess from_endianess) |
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{ |
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uint8 *buf2 = (uint8*)buf; |
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while (*table) { |
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if (bufsize) ASSERT(buf2 - (uint8*)buf < bufsize); |
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int table2 = *table & ~STRUCT_ENDIAN_HOST; |
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if (*table & STRUCT_ENDIAN_HOST) { |
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switch (table2) { |
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case STRUCT_ENDIAN_8: { |
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uint8 a = createHostInt(buf2, STRUCT_ENDIAN_8, from_endianess); |
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memcpy(buf2, &a, STRUCT_ENDIAN_8); |
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break; |
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} |
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case STRUCT_ENDIAN_16: { |
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uint16 a = createHostInt(buf2, STRUCT_ENDIAN_16, from_endianess); |
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memcpy(buf2, &a, STRUCT_ENDIAN_16); |
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break; |
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} |
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case STRUCT_ENDIAN_32: { |
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uint32 a = createHostInt(buf2, STRUCT_ENDIAN_32, from_endianess); |
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memcpy(buf2, &a, STRUCT_ENDIAN_32); |
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break; |
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} |
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case STRUCT_ENDIAN_64: { |
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uint64 q = createHostInt64(buf2, STRUCT_ENDIAN_64, from_endianess); |
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memcpy(buf2, &q, STRUCT_ENDIAN_64); |
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break; |
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} |
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default: ASSERT(0); |
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} |
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} |
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buf2 += table2; |
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table++; |
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} |
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if (bufsize) ASSERT(buf2 - (uint8*)buf == bufsize); |
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} |