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