/**
* Skips a set amount of bytes such that reading can be stopped and started again later if not
* enough bytes are available.
*
* <p>Returns {@link #READ_RESULT_CONTINUE} if all bytes have been skipped. Reset {@link
* #bytesState} to {@code 0} before calling to indicate a new set of bytes should be skipped.
*
* @param inputStream The input stream from which bytes should be skipped
* @param totalBytes The total size of bytes to be skipped
* @return One of the {@code RESULT_*} flags defined in this class
*/
private int skipBytesInternal(NonBlockingInputStream inputStream, int totalBytes) {
if (bytesState >= totalBytes) {
return READ_RESULT_CONTINUE;
}
int remainingBytes = totalBytes - bytesState;
int additionalBytesRead = inputStream.skip(remainingBytes);
return updateBytesState(additionalBytesRead, totalBytes);
}
/**
* Reads a set amount of bytes into a {@link ByteBuffer} such that reading can be stopped and
* started again later if not enough bytes are available.
*
* <p>Returns {@link #READ_RESULT_CONTINUE} if all bytes have been read. Reset {@link #bytesState}
* to {@code 0} before calling to indicate a new set of bytes should be read.
*
* @param inputStream The input stream from which bytes should be read
* @param byteBuffer The {@link ByteBuffer} into which bytes should be read
* @param totalBytes The total size of bytes to be read
* @return One of the {@code RESULT_*} flags defined in this class
*/
private int readBytesInternal(
NonBlockingInputStream inputStream, ByteBuffer byteBuffer, int totalBytes) {
if (bytesState == STATE_BEGIN_READING && totalBytes > byteBuffer.capacity()) {
throw new IllegalArgumentException("Byte buffer not large enough");
}
if (bytesState >= totalBytes) {
return READ_RESULT_CONTINUE;
}
int remainingBytes = totalBytes - bytesState;
int additionalBytesRead = inputStream.read(byteBuffer, remainingBytes);
return updateBytesState(additionalBytesRead, totalBytes);
}
/**
* Reads a set amount of bytes into a {@code byte[]} such that reading can be stopped and started
* again later if not enough bytes are available.
*
* <p>Returns {@link #READ_RESULT_CONTINUE} if all bytes have been read. Reset {@link #bytesState}
* to {@code 0} before calling to indicate a new set of bytes should be read.
*
* @param inputStream The input stream from which bytes should be read
* @param byteArray The {@code byte[]} into which bytes should be read
* @param totalBytes The total size of bytes to be read
* @return One of the {@code RESULT_*} flags defined in this class
*/
private int readBytesInternal(
NonBlockingInputStream inputStream, byte[] byteArray, int totalBytes) {
if (bytesState == STATE_BEGIN_READING && totalBytes > byteArray.length) {
throw new IllegalArgumentException("Byte array not large enough");
}
if (bytesState >= totalBytes) {
return READ_RESULT_CONTINUE;
}
int remainingBytes = totalBytes - bytesState;
int additionalBytesRead = inputStream.read(byteArray, bytesState, remainingBytes);
return updateBytesState(additionalBytesRead, totalBytes);
}
@Override
public int read(NonBlockingInputStream inputStream) throws ParserException {
Assertions.checkState(eventHandler != null);
while (true) {
while (!masterElementsStack.isEmpty()
&& bytesRead >= masterElementsStack.peek().elementEndOffsetBytes) {
eventHandler.onMasterElementEnd(masterElementsStack.pop().elementId);
return READ_RESULT_CONTINUE;
}
if (state == STATE_BEGIN_READING) {
int idResult = readElementId(inputStream);
if (idResult != READ_RESULT_CONTINUE) {
return idResult;
}
int sizeResult = readElementContentSize(inputStream);
if (sizeResult != READ_RESULT_CONTINUE) {
return sizeResult;
}
state = STATE_READ_CONTENTS;
bytesState = 0;
}
int type = eventHandler.getElementType(elementId);
switch (type) {
case TYPE_MASTER:
int masterHeaderSize = (int) (bytesRead - elementOffset); // Header size is 12 bytes max.
masterElementsStack.add(new MasterElement(elementId, bytesRead + elementContentSize));
eventHandler.onMasterElementStart(
elementId, elementOffset, masterHeaderSize, elementContentSize);
prepareForNextElement();
return READ_RESULT_CONTINUE;
case TYPE_UNSIGNED_INT:
if (elementContentSize > MAX_INTEGER_ELEMENT_SIZE_BYTES) {
throw new IllegalStateException("Invalid integer size " + elementContentSize);
}
int intResult = readBytesInternal(inputStream, tempByteArray, (int) elementContentSize);
if (intResult != READ_RESULT_CONTINUE) {
return intResult;
}
long intValue = getTempByteArrayValue((int) elementContentSize, false);
eventHandler.onIntegerElement(elementId, intValue);
prepareForNextElement();
return READ_RESULT_CONTINUE;
case TYPE_FLOAT:
if (elementContentSize != VALID_FLOAT32_ELEMENT_SIZE_BYTES
&& elementContentSize != VALID_FLOAT64_ELEMENT_SIZE_BYTES) {
throw new IllegalStateException("Invalid float size " + elementContentSize);
}
int floatResult = readBytesInternal(inputStream, tempByteArray, (int) elementContentSize);
if (floatResult != READ_RESULT_CONTINUE) {
return floatResult;
}
long valueBits = getTempByteArrayValue((int) elementContentSize, false);
double floatValue;
if (elementContentSize == VALID_FLOAT32_ELEMENT_SIZE_BYTES) {
floatValue = Float.intBitsToFloat((int) valueBits);
} else {
floatValue = Double.longBitsToDouble(valueBits);
}
eventHandler.onFloatElement(elementId, floatValue);
prepareForNextElement();
return READ_RESULT_CONTINUE;
case TYPE_STRING:
if (elementContentSize > Integer.MAX_VALUE) {
throw new IllegalStateException(
"String element size " + elementContentSize + " is larger than MAX_INT");
}
if (stringBytes == null) {
stringBytes = new byte[(int) elementContentSize];
}
int stringResult = readBytesInternal(inputStream, stringBytes, (int) elementContentSize);
if (stringResult != READ_RESULT_CONTINUE) {
return stringResult;
}
String stringValue = new String(stringBytes, Charset.forName(C.UTF8_NAME));
stringBytes = null;
eventHandler.onStringElement(elementId, stringValue);
prepareForNextElement();
return READ_RESULT_CONTINUE;
case TYPE_BINARY:
if (elementContentSize > Integer.MAX_VALUE) {
throw new IllegalStateException(
"Binary element size " + elementContentSize + " is larger than MAX_INT");
}
if (inputStream.getAvailableByteCount() < elementContentSize) {
return READ_RESULT_NEED_MORE_DATA;
}
int binaryHeaderSize = (int) (bytesRead - elementOffset); // Header size is 12 bytes max.
boolean consumed =
eventHandler.onBinaryElement(
elementId,
elementOffset,
binaryHeaderSize,
(int) elementContentSize,
inputStream);
if (consumed) {
long expectedBytesRead = elementOffset + binaryHeaderSize + elementContentSize;
if (expectedBytesRead != bytesRead) {
throw new IllegalStateException(
"Incorrect total bytes read. Expected "
+ expectedBytesRead
+ " but actually "
+ bytesRead);
}
prepareForNextElement();
}
return READ_RESULT_CONTINUE;
case TYPE_UNKNOWN:
if (elementContentSize > Integer.MAX_VALUE) {
throw new IllegalStateException(
"Unknown element size " + elementContentSize + " is larger than MAX_INT");
}
int skipResult = skipBytesInternal(inputStream, (int) elementContentSize);
if (skipResult != READ_RESULT_CONTINUE) {
return skipResult;
}
prepareForNextElement();
break;
default:
throw new IllegalStateException("Invalid element type " + type);
}
}
}