XeNTaX

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char magic[3]; // "MFB"
char version[3]; // should be 101d (= 65h)
ushort width; // is the width of a single image
ushort height; // is the height of a single image
ushort uk3; // not used?
ushort uk4; // not used?
ushort flags; // bit 2 means compressed, 1 and 4 are unknown
ushort numImages; // number of images

if((flags & 2) == 0) // uncompressed data
{
	struct {
		struct {
			byte data[width];
		} lines[height] <optimize=false>;
	} images[numImages] <optimize=false>;
}
else // compressed data
{
	struct {
		uint size;
		byte data[size];
	} images[numImages]<optimize=false>;
}

Code: Select all

/**
 * Uncompress a Beast and Bumpkins RLE-encoded data block.
 *
 * [in] in: The input (compressed) data.
 * [in] inSize: The size of the input data.
 * [out] out: The output (uncompressed) data.
 * [out] outSize: The size of the output data.
 *
 * (For images, outSize = width * height).
 *
 * TODO: Add bounds checking.
 */
bool unRLE(const uint8_t *in, size_t inSize, uint8_t *out, size_t outSize)
{
    size_t inPos = 0, outPos = 0;
    uint8_t copyByte = in[0];

    while (outPos < outSize)
    {
        if (in[inPos] == copyByte)
        {
            uint8_t count = in[inPos + 1];
            inPos += 2;

            while (count--)
                out[outPos++] = copyByte;
        }
        else
        {
            out[outPos++] = in[inPos++];
        }
    }

    return true;
}