mkjs/code/formats/nitro.js

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2017-09-08 09:24:16 -07:00
//
// nitro.js
//--------------------
// General purpose functions for nitro formats, eg. NSBTX or NSBMD
// by RHY3756547
//
// includes: gl-matrix.js (glMatrix 2.0)
//
window.nitro = new function() {
this.readHeader = function(view) { //input: DataView with base offset at header position
var stamp = readChar(view, 0x0)+readChar(view, 0x1)+readChar(view, 0x2)+readChar(view, 0x3);
var unknown1 = view.getUint32(0x4, true);
var filesize = view.getUint32(0x8, true);
var headsize = view.getUint16(0xC, true);
var numSections = view.getUint16(0xE, true);
var sectionOffsets = [];
for (var i=0; i<numSections; i++) {
sectionOffsets.push(view.getUint32(0x10+i*4, true));
}
return {
stamp: stamp,
unknown1: unknown1,
filesize: filesize,
headsize: headsize,
numSections: numSections,
sectionOffsets: sectionOffsets
}
}
this.read3dInfo = function(view, offset, dataHandler) {
var baseOff = offset;
offset += 1; //skip dummy
var numObjects = view.getUint8(offset++);
var secSize = view.getUint16(offset, true);
offset += 2;
//unknown block. documentation out of 10
var uhdSize = view.getUint16(offset, true);
offset += 2;
var usecSize = view.getUint16(offset, true);
offset += 2;
var unknown = view.getUint32(offset, true); //usually 0x0000017F
offset += 4;
var objectUnk = []
for (var i=0; i<numObjects; i++) {
var uk1 = view.getUint16(offset, true);
var uk2 = view.getUint16(offset+2, true);
objectUnk.push({uk1: uk1, uk2: uk2});
offset += 4;
}
//info block
var ihdSize = view.getUint16(offset, true);
offset += 2;
var isecSize = view.getUint16(offset, true);
offset += 2;
var objectData = []
for (var i=0; i<numObjects; i++) {
var data = dataHandler(view, offset, baseOff, i); //must return object with "nextoff" as offset after reading data
objectData.push(data)
offset = data.nextoff;
}
var names = []
for (var i=0; i<numObjects; i++) {
var name = "";
for (var j=0; j<16; j++) {
name += readChar(view, offset++)
}
names.push(name);
}
return {
numObjects: numObjects,
unknown: unknown,
objectUnk: objectUnk,
objectData: objectData,
names: names,
nextoff: offset
}
}
function readChar(view, offset) {
return String.fromCharCode(view.getUint8(offset));
}
}