matrix-react-sdk
Version:
SDK for matrix.org using React
100 lines (96 loc) • 14.1 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.blobIsAnimated = blobIsAnimated;
exports.mayBeAnimated = mayBeAnimated;
var _arrays = require("./arrays");
/*
* Copyright 2024 New Vector Ltd.
* Copyright 2022 The Matrix.org Foundation C.I.C.
*
* SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
* Please see LICENSE files in the repository root for full details.
*/
function mayBeAnimated(mimeType) {
// AVIF animation support at the time of writing is only available in Chrome hence not having `blobIsAnimated` check
return ["image/gif", "image/webp", "image/png", "image/apng", "image/avif"].includes(mimeType);
}
function arrayBufferRead(arr, start, len) {
return new Uint8Array(arr.slice(start, start + len));
}
function arrayBufferReadInt(arr, start) {
const dv = new DataView(arr, start, 4);
return dv.getUint32(0);
}
function arrayBufferReadStr(arr, start, len) {
return String.fromCharCode.apply(null, Array.from(arrayBufferRead(arr, start, len)));
}
async function blobIsAnimated(mimeType, blob) {
switch (mimeType) {
case "image/webp":
{
// Only extended file format WEBP images support animation, so grab the expected data range and verify header.
// Based on https://developers.google.com/speed/webp/docs/riff_container#extended_file_format
const arr = await blob.slice(0, 17).arrayBuffer();
if (arrayBufferReadStr(arr, 0, 4) === "RIFF" && arrayBufferReadStr(arr, 8, 4) === "WEBP" && arrayBufferReadStr(arr, 12, 4) === "VP8X") {
const [flags] = arrayBufferRead(arr, 16, 1);
// Flags: R R I L E X _A_ R (reversed)
const animationFlagMask = 1 << 1;
return (flags & animationFlagMask) != 0;
}
break;
}
case "image/gif":
{
// Based on https://gist.github.com/zakirt/faa4a58cec5a7505b10e3686a226f285
// More info at http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
const dv = new DataView(await blob.arrayBuffer(), 10);
const globalColorTable = dv.getUint8(0);
let globalColorTableSize = 0;
// check first bit, if 0, then we don't have a Global Color Table
if (globalColorTable & 0x80) {
// grab the last 3 bits, to calculate the global color table size -> RGB * 2^(N+1)
// N is the value in the last 3 bits.
globalColorTableSize = 3 * Math.pow(2, (globalColorTable & 0x7) + 1);
}
// move on to the Graphics Control Extension
const offset = 3 + globalColorTableSize;
const extensionIntroducer = dv.getUint8(offset);
const graphicsControlLabel = dv.getUint8(offset + 1);
let delayTime = 0;
// Graphics Control Extension section is where GIF animation data is stored
// First 2 bytes must be 0x21 and 0xF9
if (extensionIntroducer & 0x21 && graphicsControlLabel & 0xf9) {
// skip to the 2 bytes with the delay time
delayTime = dv.getUint16(offset + 4);
}
return !!delayTime;
}
case "image/png":
case "image/apng":
{
// Based on https://stackoverflow.com/a/68618296
const arr = await blob.arrayBuffer();
if ((0, _arrays.arrayHasDiff)([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a], Array.from(arrayBufferRead(arr, 0, 8)))) {
return false;
}
for (let i = 8; i < blob.size;) {
const length = arrayBufferReadInt(arr, i);
i += 4;
const type = arrayBufferReadStr(arr, i, 4);
i += 4;
switch (type) {
case "acTL":
return true;
case "IDAT":
return false;
}
i += length + 4;
}
break;
}
}
return false;
}
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i < blob.size; ) {\n                const length = arrayBufferReadInt(arr, i);\n                i += 4;\n                const type = arrayBufferReadStr(arr, i, 4);\n                i += 4;\n\n                switch (type) {\n                    case \"acTL\":\n                        return true;\n                    case \"IDAT\":\n                        return false;\n                }\n                i += length + 4;\n            }\n            break;\n        }\n    }\n\n    return false;\n}\n"],"mappings":";;;;;;;AAQA,IAAAA,OAAA,GAAAC,OAAA;AARA;AACA;AACA;AACA;AACA;AACA;AACA;;AAIO,SAASC,aAAaA,CAACC,QAAiB,EAAW;EACtD;EACA,OAAO,CAAC,WAAW,EAAE,YAAY,EAAE,WAAW,EAAE,YAAY,EAAE,YAAY,CAAC,CAACC,QAAQ,CAACD,QAAS,CAAC;AACnG;AAEA,SAASE,eAAeA,CAACC,GAAgB,EAAEC,KAAa,EAAEC,GAAW,EAAc;EAC/E,OAAO,IAAIC,UAAU,CAACH,GAAG,CAACI,KAAK,CAACH,KAAK,EAAEA,KAAK,GAAGC,GAAG,CAAC,CAAC;AACxD;AAEA,SAASG,kBAAkBA,CAACL,GAAgB,EAAEC,KAAa,EAAU;EACjE,MAAMK,EAAE,GAAG,IAAIC,QAAQ,CAACP,GAAG,EAAEC,KAAK,EAAE,CAAC,CAAC;EACtC,OAAOK,EAAE,CAACE,SAAS,CAAC,CAAC,CAAC;AAC1B;AAEA,SAASC,kBAAkBA,CAACT,GAAgB,EAAEC,KAAa,EAAEC,GAAW,EAAU;EAC9E,OAAOQ,MAAM,CAACC,YAAY,CAACC,KAAK,CAAC,IAAI,EAAEC,KAAK,CAACC,IAAI,CAACf,eAAe,CAACC,GAAG,EAAEC,KAAK,EAAEC,GAAG,CAAC,CAAC,CAAC;AACxF;AAEO,eAAea,cAAcA,CAAClB,QAA4B,EAAEmB,IAAU,EAAoB;EAC7F,QAAQnB,QAAQ;IACZ,KAAK,YAAY;MAAE;QACf;QACA;QACA,MAAMG,GAAG,GAAG,MAAMgB,IAAI,CAACZ,KAAK,CAAC,CAAC,EAAE,EAAE,CAAC,CAACa,WAAW,CAAC,CAAC;QACjD,IACIR,kBAAkB,CAACT,GAAG,EAAE,CAAC,EAAE,CAAC,CAAC,KAAK,MAAM,IACxCS,kBAAkB,CAACT,GAAG,EAAE,CAAC,EAAE,CAAC,CAAC,KAAK,MAAM,IACxCS,kBAAkB,CAACT,GAAG,EAAE,EAAE,EAAE,CAAC,CAAC,KAAK,MAAM,EAC3C;UACE,MAAM,CAACkB,KAAK,CAAC,GAAGnB,eAAe,CAACC,GAAG,EAAE,EAAE,EAAE,CAAC,CAAC;UAC3C;UACA,MAAMmB,iBAAiB,GAAG,CAAC,IAAI,CAAC;UAChC,OAAO,CAACD,KAAK,GAAGC,iBAAiB,KAAK,CAAC;QAC3C;QACA;MACJ;IAEA,KAAK,WAAW;MAAE;QACd;QACA;QACA,MAAMb,EAAE,GAAG,IAAIC,QAAQ,CAAC,MAAMS,IAAI,CAACC,WAAW,CAAC,CAAC,EAAE,EAAE,CAAC;QAErD,MAAMG,gBAAgB,GAAGd,EAAE,CAACe,QAAQ,CAAC,CAAC,CAAC;QACvC,IAAIC,oBAAoB,GAAG,CAAC;QAC5B;QACA,IAAIF,gBAAgB,GAAG,IAAI,EAAE;UACzB;UACA;UACAE,oBAAoB,GAAG,CAAC,GAAGC,IAAI,CAACC,GAAG,CAAC,CAAC,EAAE,CAACJ,gBAAgB,GAAG,GAAG,IAAI,CAAC,CAAC;QACxE;;QAEA;QACA,MAAMK,MAAM,GAAG,CAAC,GAAGH,oBAAoB;QAEvC,MAAMI,mBAAmB,GAAGpB,EAAE,CAACe,QAAQ,CAACI,MAAM,CAAC;QAC/C,MAAME,oBAAoB,GAAGrB,EAAE,CAACe,QAAQ,CAACI,MAAM,GAAG,CAAC,CAAC;QACpD,IAAIG,SAAS,GAAG,CAAC;;QAEjB;QACA;QACA,IAAIF,mBAAmB,GAAG,IAAI,IAAIC,oBAAoB,GAAG,IAAI,EAAE;UAC3D;UACAC,SAAS,GAAGtB,EAAE,CAACuB,SAAS,CAACJ,MAAM,GAAG,CAAC,CAAC;QACxC;QAEA,OAAO,CAAC,CAACG,SAAS;MACtB;IAEA,KAAK,WAAW;IAChB,KAAK,YAAY;MAAE;QACf;QACA,MAAM5B,GAAG,GAAG,MAAMgB,IAAI,CAACC,WAAW,CAAC,CAAC;QACpC,IACI,IAAAa,oBAAY,EAAC,CAAC,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,CAAC,EAAEjB,KAAK,CAACC,IAAI,CAACf,eAAe,CAACC,GAAG,EAAE,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC,EACxG;UACE,OAAO,KAAK;QAChB;QAEA,KAAK,IAAI+B,CAAC,GAAG,CAAC,EAAEA,CAAC,GAAGf,IAAI,CAACgB,IAAI,GAAI;UAC7B,MAAMC,MAAM,GAAG5B,kBAAkB,CAACL,GAAG,EAAE+B,CAAC,CAAC;UACzCA,CAAC,IAAI,CAAC;UACN,MAAMG,IAAI,GAAGzB,kBAAkB,CAACT,GAAG,EAAE+B,CAAC,EAAE,CAAC,CAAC;UAC1CA,CAAC,IAAI,CAAC;UAEN,QAAQG,IAAI;YACR,KAAK,MAAM;cACP,OAAO,IAAI;YACf,KAAK,MAAM;cACP,OAAO,KAAK;UACpB;UACAH,CAAC,IAAIE,MAAM,GAAG,CAAC;QACnB;QACA;MACJ;EACJ;EAEA,OAAO,KAAK;AAChB","ignoreList":[]}