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estimateDataURLDecodedBytes.js2.0 KB · 74 lines
/** * Estimate decoded byte length of a data:// URL *without* allocating large buffers. * - For base64: compute exact decoded size using length and padding; *               handle %XX at the character-count level (no string allocation). * - For non-base64: use UTF-8 byteLength of the encoded body as a safe upper bound. * * @param {string} url * @returns {number} */export default function estimateDataURLDecodedBytes(url) {  if (!url || typeof url !== 'string') return 0;  if (!url.startsWith('data:')) return 0;   const comma = url.indexOf(',');  if (comma < 0) return 0;   const meta = url.slice(5, comma);  const body = url.slice(comma + 1);  const isBase64 = /;base64/i.test(meta);   if (isBase64) {    let effectiveLen = body.length;    const len = body.length; // cache length     for (let i = 0; i < len; i++) {      if (body.charCodeAt(i) === 37 /* '%' */ && i + 2 < len) {        const a = body.charCodeAt(i + 1);        const b = body.charCodeAt(i + 2);        const isHex =          ((a >= 48 && a <= 57) || (a >= 65 && a <= 70) || (a >= 97 && a <= 102)) &&          ((b >= 48 && b <= 57) || (b >= 65 && b <= 70) || (b >= 97 && b <= 102));         if (isHex) {          effectiveLen -= 2;          i += 2;        }      }    }     let pad = 0;    let idx = len - 1;     const tailIsPct3D = (j) =>      j >= 2 &&      body.charCodeAt(j - 2) === 37 && // '%'      body.charCodeAt(j - 1) === 51 && // '3'      (body.charCodeAt(j) === 68 || body.charCodeAt(j) === 100); // 'D' or 'd'     if (idx >= 0) {      if (body.charCodeAt(idx) === 61 /* '=' */) {        pad++;        idx--;      } else if (tailIsPct3D(idx)) {        pad++;        idx -= 3;      }    }     if (pad === 1 && idx >= 0) {      if (body.charCodeAt(idx) === 61 /* '=' */) {        pad++;      } else if (tailIsPct3D(idx)) {        pad++;      }    }     const groups = Math.floor(effectiveLen / 4);    const bytes = groups * 3 - (pad || 0);    return bytes > 0 ? bytes : 0;  }   return Buffer.byteLength(body, 'utf8');}