Read to and write from a binary file

fileio.h

#include <stdio.h>

// Reads binary file and returns its content in a byte array.
// NOTE: it's caller responsibility to free returned array with "delete[]".
inline unsigned char* readFile(const char* fileName, long* fileSizeToReturn)
{
	// open file
	FILE* file = fopen(fileName, "rb");
	if (NULL == file)
	{
		return NULL;
	}

	// get file size
	fseek(file, 0, SEEK_END);
	long fileSize = ftell(file);

	// create byte array
	unsigned char* buffer = new unsigned char[fileSize];

	// read file to buffer
	fseek(file, 0, SEEK_SET);
	fread(buffer, 1, fileSize, file);

	// close file
	fclose(file);

	// return file size if needed
	if (fileSizeToReturn != NULL)
	{
		*fileSizeToReturn = fileSize;
	}

	// return file content
	return buffer;
}

// Writes a byte array to a file.
inline BOOL writeFile(const char* fileName, unsigned char* buffer, long bufferSize)
{
	// open file
	FILE* file = fopen(fileName, "wb");
	if (NULL == file)
	{
		return FALSE;
	}

	// write buffer to file
	fwrite(buffer, 1, bufferSize, file);

	// close file
	fclose(file);

	return TRUE;
}