The Nitro File Format is the basic file format of almost every data file found in a NDS file. A Nitro file contains a number of frames of data that are explained in detail in other files.
Every Nitro file begins with a specific NFF header. The format of the header (as a C-struct) is:
struct nff_header {
char magic[4]; // Contains a string representing the file type
short bom; /*
* Like the byte-order marker of UTF-16, this short, which
* always contains 0xFFFE, represents the endianness of
* 'magic' (if it reads 0xFEFF, reverse the 4 bytes to get
* the correct left-to-right reading.)
*/
short unknown1; // Appears to always contain 0x0100
long file_size; // Size of the Nitro file (in bytes)
short unknown3; // Possibly the size of this header (in bytes). Appears to
// always contain 0x0010
short num_frames; // Contains the number of frames in this file
};
This header is followed by num_frames NFF frames which always begin with a specific frame header of this type:
struct nff_frame_header {
char magic[4]; // Contains a string representing the frame type. Always
// must be reversed to read.
long frame_size; // Size of the frame including this header (in bytes)
};
Each frame header is then followed by (frame_size - 6) bytes that are the contents of the frame.