/**
* Read a {@code string} field value from the stream. If the stream contains malformed UTF-8,
* throw exception {@link InvalidProtocolBufferException}.
*/
public String readStringRequireUtf8() throws IOException {
final int size = readRawVarint32();
final byte[] bytes;
int pos = bufferPos;
if (size <= (bufferSize - pos) && size > 0) {
// Fast path: We already have the bytes in a contiguous buffer, so
// just copy directly from it.
bytes = buffer;
bufferPos = pos + size;
} else if (size == 0) {
return "";
} else {
// Slow path: Build a byte array first then copy it.
bytes = readRawBytesSlowPath(size);
pos = 0;
}
// TODO(martinrb): We could save a pass by validating while decoding.
if (!Utf8.isValidUtf8(bytes, pos, pos + size)) {
throw InvalidProtocolBufferException.invalidUtf8();
}
return new String(bytes, pos, size, Internal.UTF_8);
}
