securityos/node_modules/ani-cursor/dist/parser.js

83 lines
3.4 KiB
JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseAni = void 0;
var riff_file_1 = require("riff-file");
var byte_data_1 = require("byte-data");
var DWORD = { bits: 32, be: false, signed: false, fp: false };
function parseAni(arr) {
var riff = new riff_file_1.RIFFFile();
riff.setSignature(arr);
var signature = riff.signature;
if (signature.format !== "ACON") {
throw new Error("Expected format. Expected \"ACON\", got \"" + signature.format + "\"");
}
// Helper function to get a chunk by chunkId and transform it if it's non-null.
function mapChunk(chunkId, mapper) {
var chunk = riff.findChunk(chunkId);
return chunk == null ? null : mapper(chunk);
}
function readImages(chunk, frameCount) {
return chunk.subChunks.slice(0, frameCount).map(function (c) {
if (c.chunkId !== "icon") {
throw new Error("Unexpected chunk type in fram: " + c.chunkId);
}
return arr.slice(c.chunkData.start, c.chunkData.end);
});
}
var metadata = mapChunk("anih", function (c) {
var words = byte_data_1.unpackArray(arr, DWORD, c.chunkData.start, c.chunkData.end);
return {
cbSize: words[0],
nFrames: words[1],
nSteps: words[2],
iWidth: words[3],
iHeight: words[4],
iBitCount: words[5],
nPlanes: words[6],
iDispRate: words[7],
bfAttributes: words[8],
};
});
if (metadata == null) {
throw new Error("Did not find anih");
}
var rate = mapChunk("rate", function (c) {
return byte_data_1.unpackArray(arr, DWORD, c.chunkData.start, c.chunkData.end);
});
// chunkIds are always four chars, hence the trailing space.
var seq = mapChunk("seq ", function (c) {
return byte_data_1.unpackArray(arr, DWORD, c.chunkData.start, c.chunkData.end);
});
var lists = riff.findChunk("LIST", true);
var imageChunk = lists === null || lists === void 0 ? void 0 : lists.find(function (c) { return c.format === "fram"; });
if (imageChunk == null) {
throw new Error("Did not find fram LIST");
}
var images = readImages(imageChunk, metadata.nFrames);
var title = null;
var artist = null;
var infoChunk = lists === null || lists === void 0 ? void 0 : lists.find(function (c) { return c.format === "INFO"; });
if (infoChunk != null) {
infoChunk.subChunks.forEach(function (c) {
switch (c.chunkId) {
case "INAM":
title = byte_data_1.unpackString(arr, c.chunkData.start, c.chunkData.end);
break;
case "IART":
artist = byte_data_1.unpackString(arr, c.chunkData.start, c.chunkData.end);
break;
case "LIST":
// Some cursors with an artist of "Created with Take ONE 3.5 (unregisterred version)" seem to have their frames here for some reason?
if (c.format === "fram") {
images = readImages(c, metadata.nFrames);
}
break;
default:
// Unexpected subchunk
}
});
}
return { images: images, rate: rate, seq: seq, metadata: metadata, artist: artist, title: title };
}
exports.parseAni = parseAni;
//# sourceMappingURL=parser.js.map