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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
#include <stdlib.h>
#include <string.h>
#include "NgCommon.h"
/* Non-zero = big-endian architecture */
static BYTE4 hostIsMSB = 0;
/* Store last error msg */
#define MAX_MSG_SIZE 100
char errorMsg[MAX_MSG_SIZE];
/* Library initialization */
void NgInit()
{
BYTE4 result = (BYTE4) 'A';
/* determine the byte ordering of the host machine */
hostIsMSB = (BYTE4) (*((char *) &result) != 'A');
errorMsg[0] = 0;
}
/**
* Memory allocation routine
*/
void *NgMalloc (UBYTE4 size)
{
return malloc (size);
}
/**
* Memory allocation routine
*/
void NgFree (void *memblock)
{
if (memblock != NULL)
free (memblock);
}
void NgMemSet (void *dest, UBYTE1 c, BYTE4 count)
{
memset (dest, c, count);
}
void NgMemCpy (void *dest, void *src, BYTE4 count)
{
memcpy (dest, src, count);
}
/**
* Error Reporting
*/
ng_err_t NgError (ng_err_t error_type, char* msg) {
if (msg != NULL)
{
/* Store a copy of the last error msg - truncate if necessary */
size_t size = strlen (msg);
if (size >= MAX_MSG_SIZE) size = MAX_MSG_SIZE - 1;
NgMemCpy (errorMsg, msg, size);
errorMsg[size] = 0;
}
return error_type;
}
const char *NgGetLastErrorMsg()
{
return errorMsg;
}
/**
* Stream manipulation routines
*/
ng_err_t NgStreamInit (ng_stream_t *stream, char *fullname)
{
stream->file = fopen (fullname, "rb");
stream->size = 0;
stream->pos = 0;
if (stream->file == NULL) return NgError (ERR_NG, "Can't open file");
return ERR_OK;
}
void NgStreamClose (ng_stream_t *stream)
{
if (stream->file != NULL)
{
fclose (stream->file);
stream->file = NULL;
}
stream->size = -1;
}
char NgStreamEof (ng_stream_t *stream)
{
return stream->size == -1;
}
BYTE4 NgStreamGetPosition (ng_stream_t *stream)
{
return stream->pos;
}
BYTE4 NgStreamSkip (ng_stream_t *stream, BYTE4 nbr)
{
if (stream->size == -1) return 0;
if (fseek (stream->file, nbr, SEEK_CUR))
{
NgStreamClose (stream);
return 0;
}
stream->pos += nbr;
return nbr;
}
BYTE4 NgStreamRead (ng_stream_t *stream, char *buffer, BYTE4 nbr)
{
size_t cnt;
if (stream->size == -1) return 0;
cnt = fread (buffer, sizeof (char), nbr, stream->file);
if (cnt != nbr)
{
NgStreamClose (stream);
return 0;
}
stream->pos += nbr;
return nbr;
}
BYTE1 NgIsMSB()
{
return hostIsMSB != 0;
}
UBYTE2 SystemToLittleEndianUBYTE2 (UBYTE2 value)
{
return hostIsMSB ? ((value&0xFF) << 8)|((value&0xFF00)>>8) : value;
}
UBYTE4 SystemToLittleEndianUBYTE4 (UBYTE4 value)
{
return hostIsMSB ? ((value&0xFF000000L)>>24)|((value&0xFF0000L)>>8) | ((value&0xFF00L)<<8) | ((value&0xFFL)<<24) : value;
}
UBYTE2 SystemToBigEndianUBYTE2 (UBYTE2 value)
{
return hostIsMSB ? value : ((value&0xFF) << 8)|((value&0xFF00)>>8);
}
UBYTE2 LittleEndianToSystemUBYTE2 (UBYTE2 value)
{
return hostIsMSB ? ((value&0xFF) << 8)|((value&0xFF00)>>8) : value;
}
UBYTE4 LittleEndianToSystemUBYTE4 (UBYTE4 value)
{
return hostIsMSB ? ((value&0xFF000000L)>>24)|((value&0xFF0000L)>>8) | ((value&0xFF00L)<<8) | ((value&0xFFL)<<24) : value;
}
UBYTE2 BigEndianToSystemUBYTE2 (UBYTE2 value)
{
return hostIsMSB ? value : ((value&0xFF) << 8)|((value&0xFF00)>>8);
}
UBYTE4 BigEndianToSystemUBYTE4 (UBYTE4 value)
{
return hostIsMSB ? value : ((value&0xFF000000L)>>24)|((value&0xFF0000L)>>8)|((value&0xFF00L)<<8) | ((value&0xFFL)<<24);
}
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