/***** BEGIN LICENSE BLOCK *****

BSD License

Copyright (c) 2005-2009, NIF File Format Library and Tools
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
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   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
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   used to endorse or promote products derived from this software
   without specific prior written permission.

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***** END LICENCE BLOCK *****/

#include "Stream.h"

#include <stdio.h>  // printf
#include <string.h> // memcpy

unsigned int Stream::seek(unsigned int p)
{
	if (p > size) {
		printf("DDS: trying to seek beyond end of stream (corrupt file?)");
	}
	else {
		pos = p;
	}

	return pos;
}

unsigned int mem_read(Stream & mem, unsigned long long & i)
{
	if (mem.pos + 8 > mem.size) {
		printf("DDS: trying to read beyond end of stream (corrupt file?)");
		return(0);
	};
	memcpy(&i, mem.mem + mem.pos, 8); // @@ todo: make sure little endian
	mem.pos += 8;
	return(8);
}

unsigned int mem_read(Stream & mem, unsigned int & i)
{
	if (mem.pos + 4 > mem.size) {
		printf("DDS: trying to read beyond end of stream (corrupt file?)");
		return(0);
	};
	memcpy(&i, mem.mem + mem.pos, 4); // @@ todo: make sure little endian
	mem.pos += 4;
	return(4);
}

unsigned int mem_read(Stream & mem, unsigned short & i)
{
	if (mem.pos + 2 > mem.size) {
		printf("DDS: trying to read beyond end of stream (corrupt file?)");
		return(0);
	};
	memcpy(&i, mem.mem + mem.pos, 2); // @@ todo: make sure little endian
	mem.pos += 2;
	return(2);
}

unsigned int mem_read(Stream & mem, unsigned char & i)
{
	if (mem.pos + 1 > mem.size) {
		printf("DDS: trying to read beyond end of stream (corrupt file?)");
		return(0);
	};
	i = (mem.mem + mem.pos)[0];
	mem.pos += 1;
	return(1);
}

unsigned int mem_read(Stream & mem, unsigned char *i, unsigned int cnt)
{
	if (mem.pos + cnt > mem.size) {
		printf("DDS: trying to read beyond end of stream (corrupt file?)");
		return(0);
	};
	memcpy(i, mem.mem + mem.pos, cnt);
	mem.pos += cnt;
	return(cnt);
}

