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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2006 Joseph Eagar (joeedh@gmail.com)
*/
/** \file
* \ingroup imbcineon
*
* Cineon image file format library routines.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "logImageCore.h"
#include "logmemfile.h"
int logimage_fseek(LogImageFile *logFile, intptr_t offset, int origin)
{
if (logFile->file) {
fseek(logFile->file, offset, origin);
}
else { /* we're seeking in memory */
if (origin == SEEK_SET) {
if (offset > logFile->memBufferSize) {
return 1;
}
logFile->memCursor = logFile->memBuffer + offset;
}
else if (origin == SEEK_END) {
if (offset > logFile->memBufferSize) {
return 1;
}
logFile->memCursor = (logFile->memBuffer + logFile->memBufferSize) - offset;
}
else if (origin == SEEK_CUR) {
uintptr_t pos = (uintptr_t)logFile->memCursor - (uintptr_t)logFile->memBuffer;
if (pos + offset > logFile->memBufferSize) {
return 1;
}
logFile->memCursor += offset;
}
}
return 0;
}
int logimage_fwrite(void *buffer, size_t size, unsigned int count, LogImageFile *logFile)
{
if (logFile->file) {
return fwrite(buffer, size, count, logFile->file);
}
else { /* we're writing to memory */
/* do nothing as this isn't supported yet */
return count;
}
}
int logimage_fread(void *buffer, size_t size, unsigned int count, LogImageFile *logFile)
{
if (logFile->file) {
return fread(buffer, size, count, logFile->file);
}
else { /* we're reading from memory */
unsigned char *buf = (unsigned char *)buffer;
uintptr_t pos = (uintptr_t)logFile->memCursor - (uintptr_t)logFile->memBuffer;
size_t total_size = size * count;
if (pos + total_size > logFile->memBufferSize) {
/* how many elements can we read without overflow ? */
count = (logFile->memBufferSize - pos) / size;
/* recompute the size */
total_size = size * count;
}
if (total_size != 0) {
memcpy(buf, logFile->memCursor, total_size);
}
return count;
}
}
int logimage_read_uchar(unsigned char *x, LogImageFile *logFile)
{
uintptr_t pos = (uintptr_t)logFile->memCursor - (uintptr_t)logFile->memBuffer;
if (pos + sizeof(unsigned char) > logFile->memBufferSize) {
return 1;
}
*x = *(unsigned char *)logFile->memCursor;
logFile->memCursor += sizeof(unsigned char);
return 0;
}
int logimage_read_ushort(unsigned short *x, LogImageFile *logFile)
{
uintptr_t pos = (uintptr_t)logFile->memCursor - (uintptr_t)logFile->memBuffer;
if (pos + sizeof(unsigned short) > logFile->memBufferSize) {
return 1;
}
*x = *(unsigned short *)logFile->memCursor;
logFile->memCursor += sizeof(unsigned short);
return 0;
}
int logimage_read_uint(unsigned int *x, LogImageFile *logFile)
{
uintptr_t pos = (uintptr_t)logFile->memCursor - (uintptr_t)logFile->memBuffer;
if (pos + sizeof(unsigned int) > logFile->memBufferSize) {
return 1;
}
*x = *(unsigned int *)logFile->memCursor;
logFile->memCursor += sizeof(unsigned int);
return 0;
}
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