static void write_string(WTF::Vector<char>& v, const WebCore::String& str) { unsigned strLen = str.length(); // Only do work if the string has data. if (strLen) { // Determine how much to grow the vector. Use the worst case for utf8 to // avoid reading the string twice. Add sizeof(unsigned) to hold the // string length in utf8. unsigned vectorLen = v.size() + sizeof(unsigned); unsigned length = (strLen << 2) + vectorLen; // Grow the vector. This will change the value of v.size() but we // remember the original size above. v.grow(length); // Grab the position to write to. char* data = v.begin() + vectorLen; // Write the actual string int l = SkUTF16_ToUTF8(str.characters(), strLen, data); LOGV("Writing string %d %.*s", l, l, data); // Go back and write the utf8 length. Subtract sizeof(unsigned) from // data to get the position to write the length. memcpy(data - sizeof(unsigned), (char*)&l, sizeof(unsigned)); // Shrink the internal state of the vector so we match what was // actually written. v.shrink(vectorLen + l); } else v.append((char*)&strLen, sizeof(unsigned)); }