Function saveResponseAndStatus

src/Fetch.js:578–612

()

  // This receives a condition, which determines whether to save the xhr's
  // response, or just 0.
  function saveResponseAndStatus() {
    var ptr = 0;
    var ptrLen = 0;
    if (xhr.response && fetchAttrLoadToMemory && {{{ makeGetValue('fetch', C_STRUCTS.emscripten_fetch_t.data, '*') }}} === 0) {
      ptrLen = xhr.response.byteLength;
    }
    if (ptrLen > 0) {
#if FETCH_DEBUG
      dbg(`fetch: allocating ${ptrLen} bytes in Emscripten heap for xhr data`);
#endif
      // The data pointer malloc()ed here has the same lifetime as the emscripten_fetch_t structure itself has, and is
      // freed when emscripten_fetch_close() is called.
      ptr = _realloc({{{ makeGetValue('fetch', C_STRUCTS.emscripten_fetch_t.data, '*') }}}, ptrLen);
      HEAPU8.set(new Uint8Array(/** @type{Array<number>} */(xhr.response)), ptr);
    }
    {{{ makeSetValue('fetch', C_STRUCTS.emscripten_fetch_t.data, 'ptr', '*') }}}
    writeI53ToI64(fetch + {{{ C_STRUCTS.emscripten_fetch_t.numBytes }}}, ptrLen);
    writeI53ToI64(fetch + {{{ C_STRUCTS.emscripten_fetch_t.dataOffset }}}, 0);
    var len = xhr.response?.byteLength ?? 0;
    if (len) {
      // If the final XHR.onload handler receives the bytedata to compute total length, report that,
      // otherwise don't write anything out here, which will retain the latest byte size reported in
      // the most recent XHR.onprogress handler.
      writeI53ToI64(fetch + {{{ C_STRUCTS.emscripten_fetch_t.totalBytes }}}, len);
    }
    {{{ makeSetValue('fetch', C_STRUCTS.emscripten_fetch_t.readyState, 'xhr.readyState', 'i16') }}}
    {{{ makeSetValue('fetch', C_STRUCTS.emscripten_fetch_t.status, 'xhr.status', 'i16') }}}
    if (xhr.statusText) stringToUTF8(xhr.statusText, fetch + {{{ C_STRUCTS.emscripten_fetch_t.statusText }}}, 64);
    if (fetchAttrSynchronous) {
      // The response url pointer malloc()ed here has the same lifetime as the emscripten_fetch_t structure itself has, and is
      // freed when emscripten_fetch_close() is called.
      var ruPtr = stringToNewUTF8(xhr.responseURL);
      {{{ makeSetValue('fetch', C_STRUCTS.emscripten_fetch_t.responseUrl, 'ruPtr', '*') }}}
    }
  }

  xhr.onload = (e) => {
    // check if xhr was aborted by user and don't try to call back