f897031217
git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@14608 67ed7778-7388-44ab-90cf-0a291f65f57c
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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Copyright (C) 2004 Peter Urbanec <toppy at urbanec.net>
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This file is part of puppy.
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puppy is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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puppy 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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You should have received a copy of the GNU General Public License
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along with puppy; if not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include "tf_bytes.h"
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/* The Topfield packet handling is a bit unusual. All data is stored in
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* memory in big endian order, however, just prior to transmission all
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* data is byte swapped.
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*
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* We try to handle this in here in a some kind of a portable manner.
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*
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* We provide functions to read and write the memory version of packets
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* under the name get_X() and put_X().
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*
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* The USB I/O layer then takes care of CRC generation and byte swapping.
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*/
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unsigned short get_u16(void *addr)
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{
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unsigned char *b = addr;
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return ((b[0] << 8) | (b[1] << 0));
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}
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/* Retrieve a 16-bit integer from the raw buffer (prior to byteswapping) */
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unsigned short get_u16_raw(void *addr)
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{
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unsigned char *b = addr;
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return ((b[1] << 8) | (b[0] << 0));
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}
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void put_u16(void *addr, unsigned short val)
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{
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unsigned char *b = addr;
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b[0] = (val >> 8) & 0xFF;
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b[1] = (val & 0xFF);
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}
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unsigned int get_u32(void *addr)
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{
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unsigned char *b = addr;
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return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
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}
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/* Retrieve a 32-bit integer from the raw buffer (prior to byteswapping) */
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unsigned int get_u32_raw(void *addr)
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{
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unsigned char *b = addr;
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return (b[1] << 24) | (b[0] << 16) | (b[3] << 8) | (b[2]);
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}
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void put_u32(void *addr, unsigned int val)
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{
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unsigned char *b = addr;
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b[0] = (val >> 24) & 0xFF;
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b[1] = (val >> 16) & 0xFF;
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b[2] = (val >> 8) & 0xFF;
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b[3] = (val & 0xFF);
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}
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uint64_t get_u64(void *addr)
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{
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unsigned char *b = addr;
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uint64_t r = b[0];
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r = (r << 8) | b[1];
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r = (r << 8) | b[2];
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r = (r << 8) | b[3];
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r = (r << 8) | b[4];
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r = (r << 8) | b[5];
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r = (r << 8) | b[6];
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r = (r << 8) | b[7];
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return r;
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}
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void put_u64(void *addr, uint64_t val)
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{
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unsigned char *b = addr;
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b[0] = (val >> 56) & 0xFF;
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b[1] = (val >> 48) & 0xFF;
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b[2] = (val >> 40) & 0xFF;
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b[3] = (val >> 32) & 0xFF;
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b[4] = (val >> 24) & 0xFF;
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b[5] = (val >> 16) & 0xFF;
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b[6] = (val >> 8) & 0xFF;
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b[7] = (val & 0xFF);
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}
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