#pragma once

/** data source wrapping the memory */
template <typename File> class DataSourceMemory {
	
	const uint8_t* src;
	const uint32_t len;
	uint32_t pos;
	
public:

	/** ctor with the memory region */
	DataSourceMemory(const uint8_t* src, const uint32_t len) : src(src), len(len) {
		
	}
	
	/** get the current position */
	uint32_t curPos() const {
		return pos;
	}

	/** seek to the given position */
	void seekTo(uint32_t newPos) {
		pos = newPos;
	}

	/** read an entity */
	template <typename T> void readType(T& dst) {
		read(sizeof(T), &dst);
	}

	/** read x bytes from the input into dst */
	template <typename T> void read(uint32_t size, T* dst) {
		memcpy(dst, &src[pos], size);
		pos += size;
	}
	
};