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package io.protostuff;
import static io.protostuff.ProtobufException.invalidEndTag;
import static io.protostuff.ProtobufException.invalidTag;
import static io.protostuff.ProtobufException.invalidWireType;
import static io.protostuff.ProtobufException.misreportedSize;
import static io.protostuff.ProtobufException.negativeSize;
import static io.protostuff.WireFormat.TAG_TYPE_BITS;
import static io.protostuff.WireFormat.TAG_TYPE_MASK;
import static io.protostuff.WireFormat.WIRETYPE_END_GROUP;
import static io.protostuff.WireFormat.WIRETYPE_FIXED32;
import static io.protostuff.WireFormat.WIRETYPE_FIXED64;
import static io.protostuff.WireFormat.WIRETYPE_LENGTH_DELIMITED;
import static io.protostuff.WireFormat.WIRETYPE_START_GROUP;
import static io.protostuff.WireFormat.WIRETYPE_TAIL_DELIMITER;
import static io.protostuff.WireFormat.WIRETYPE_VARINT;
import static io.protostuff.WireFormat.getTagFieldNumber;
import static io.protostuff.WireFormat.getTagWireType;
import static io.protostuff.WireFormat.makeTag;
import java.io.IOException;
import java.nio.ByteBuffer;
import io.netty.buffer.ByteBuf;
import io.protostuff.StringSerializer.STRING;
import rpc.turbo.serialization.SerializationConstants;
import rpc.turbo.util.ByteBufUtils;
import rpc.turbo.util.UnsafeStringUtils;
import rpc.turbo.util.concurrent.ThreadLocalBytes;
public final class ByteBufInput implements Input {
private ByteBuf byteBuf;
private int lastTag = 0;
private int packedLimit = 0;
/**
* If true, the nested messages are group-encoded
*/
private boolean decodeNestedMessageAsGroup;
/**
* An input for a ByteBuffer
*
* @param byteBuf
* the buffer to read from, it will be sliced
* @param protostuffMessage
* if we are parsing a protostuff (true) or protobuf (false) message
*/
public ByteBufInput(ByteBuf byteBuf, boolean protostuffMessage) {
this.byteBuf = byteBuf;
this.decodeNestedMessageAsGroup = protostuffMessage;
}
public ByteBuf getByteBuf() {
return byteBuf;
}
public void setByteBuf(ByteBuf buffer, boolean protostuffMessage) {
this.byteBuf = buffer;
this.decodeNestedMessageAsGroup = protostuffMessage;
this.lastTag = 0;
this.packedLimit = 0;
}
/**
* Resets the offset and the limit of the internal buffer.
*/
public ByteBufInput reset(int offset, int len) {
return this;
}
/**
* Returns the current offset (the position).
*/
public int currentOffset() {
return byteBuf.readerIndex();
}
/**
* Returns the current limit (the end index).
*/
public int currentLimit() {
return byteBuf.writerIndex();
}
/**
* Return true if currently reading packed field
*/
public boolean isCurrentFieldPacked() {
return packedLimit != 0 && packedLimit != byteBuf.readerIndex();
}
/**
* Returns the last tag.
*/
public int getLastTag() {
return lastTag;
}
/**
* Attempt to read a field tag, returning zero if we have reached EOF. Protocol
* message parsers use this to read tags, since a protocol message may legally
* end wherever a tag occurs, and zero is not a valid tag number.
*/
public int readTag() throws IOException {
if (byteBuf.readableBytes() == 0) {
lastTag = 0;
return 0;
}
final int tag = readRawVarint32();
if (tag >>> TAG_TYPE_BITS == 0) {
// If we actually read zero, that's not a valid tag.
throw invalidTag();
}
lastTag = tag;
return tag;
}
/**
* Verifies that the last call to readTag() returned the given tag value. This
* is used to verify that a nested group ended with the correct end tag.
*
* @throws ProtobufException
* {@code value} does not match the last tag.
*/
public void checkLastTagWas(final int value) throws ProtobufException {
if (lastTag != value) {
throw invalidEndTag();
}
}
/**
* Reads and discards a single field, given its tag value.
*
* @return {@code false} if the tag is an endgroup tag, in which case nothing is
* skipped. Otherwise, returns {@code true}.
*/
public boolean skipField(final int tag) throws IOException {
switch (getTagWireType(tag)) {
case WIRETYPE_VARINT:
readInt32();
return true;
case WIRETYPE_FIXED64:
readRawLittleEndian64();
return true;
case WIRETYPE_LENGTH_DELIMITED:
final int size = readRawVarint32();
if (size < 0)
throw negativeSize();
byteBuf.readerIndex(byteBuf.readerIndex() + size);
// offset += size;
return true;
case WIRETYPE_START_GROUP:
skipMessage();
checkLastTagWas(makeTag(getTagFieldNumber(tag), WIRETYPE_END_GROUP));
return true;
case WIRETYPE_END_GROUP:
return false;
case WIRETYPE_FIXED32:
readRawLittleEndian32();
return true;
default:
throw invalidWireType();
}
}
/**
* Reads and discards an entire message. This will read either until EOF or
* until an endgroup tag, whichever comes first.
*/
public void skipMessage() throws IOException {
while (true) {
final int tag = readTag();
if (tag == 0 || !skipField(tag)) {
return;
}
}
}
@Override
public void handleUnknownField(int fieldNumber, Schema schema) throws IOException {
skipField(lastTag);
}
@Override
public int readFieldNumber(Schema schema) throws IOException {
if (byteBuf.readableBytes() == 0) {
lastTag = 0;
return 0;
}
// are we reading packed field?
if (isCurrentFieldPacked()) {
if (packedLimit < byteBuf.readerIndex())
throw misreportedSize();
// Return field number while reading packed field
return lastTag >>> TAG_TYPE_BITS;
}
packedLimit = 0;
final int tag = readRawVarint32();
final int fieldNumber = tag >>> TAG_TYPE_BITS;
if (fieldNumber == 0) {
if (decodeNestedMessageAsGroup && WIRETYPE_TAIL_DELIMITER == (tag & TAG_TYPE_MASK)) {
// protostuff's tail delimiter for streaming
// 2 options: length-delimited or tail-delimited.
lastTag = 0;
return 0;
}
// If we actually read zero, that's not a valid tag.
throw invalidTag();
}
if (decodeNestedMessageAsGroup && WIRETYPE_END_GROUP == (tag & TAG_TYPE_MASK)) {
lastTag = 0;
return 0;
}
lastTag = tag;
return fieldNumber;
}
/**
* Check if this field have been packed into a length-delimited field. If so,
* update internal state to reflect that packed fields are being read.
*
* @throws IOException
*/
private void checkIfPackedField() throws IOException {
// Do we have the start of a packed field?
if (packedLimit == 0 && getTagWireType(lastTag) == WIRETYPE_LENGTH_DELIMITED) {
final int length = readRawVarint32();
if (length < 0)
throw negativeSize();
if (length > byteBuf.readableBytes())
throw misreportedSize();
this.packedLimit = byteBuf.readerIndex() + length;
}
}
/**
* Read a {@code double} field value from the internal buffer.
*/
@Override
public double readDouble() throws IOException {
checkIfPackedField();
return Double.longBitsToDouble(readRawLittleEndian64());
}
/**
* Read a {@code float} field value from the internal buffer.
*/
@Override
public float readFloat() throws IOException {
checkIfPackedField();
return Float.intBitsToFloat(readRawLittleEndian32());
}
/**
* Read a {@code uint64} field value from the internal buffer.
*/
@Override
public long readUInt64() throws IOException {
checkIfPackedField();
return readRawVarint64();
}
/**
* Read an {@code int64} field value from the internal buffer.
*/
@Override
public long readInt64() throws IOException {
checkIfPackedField();
return readRawVarint64();
}
/**
* Read an {@code int32} field value from the internal buffer.
*/
@Override
public int readInt32() throws IOException {
checkIfPackedField();
return readRawVarint32();
}
/**
* Read a {@code fixed64} field value from the internal buffer.
*/
@Override
public long readFixed64() throws IOException {
checkIfPackedField();
return readRawLittleEndian64();
}
/**
* Read a {@code fixed32} field value from the internal buffer.
*/
@Override
public int readFixed32() throws IOException {
checkIfPackedField();
return readRawLittleEndian32();
}
/**
* Read a {@code bool} field value from the internal buffer.
*/
@Override
public boolean readBool() throws IOException {
checkIfPackedField();
return byteBuf.readByte() != 0;
}
/**
* Read a {@code uint32} field value from the internal buffer.
*/
@Override
public int readUInt32() throws IOException {
checkIfPackedField();
return readRawVarint32();
}
/**
* Read an enum field value from the internal buffer. Caller is responsible for
* converting the numeric value to an actual enum.
*/
@Override
public int readEnum() throws IOException {
checkIfPackedField();
return readRawVarint32();
}
/**
* Read an {@code sfixed32} field value from the internal buffer.
*/
@Override
public int readSFixed32() throws IOException {
checkIfPackedField();
return readRawLittleEndian32();
}
/**
* Read an {@code sfixed64} field value from the internal buffer.
*/
@Override
public long readSFixed64() throws IOException {
checkIfPackedField();
return readRawLittleEndian64();
}
/**
* Read an {@code sint32} field value from the internal buffer.
*/
@Override
public int readSInt32() throws IOException {
checkIfPackedField();
final int n = readRawVarint32();
return (n >>> 1) ^ -(n & 1);
}
/**
* Read an {@code sint64} field value from the internal buffer.
*/
@Override
public long readSInt64() throws IOException {
checkIfPackedField();
final long n = readRawVarint64();
return (n >>> 1) ^ -(n & 1);
}
@Override
public String readString() throws IOException {
if (SerializationConstants.INCOMPATIBLE_FAST_STRING_FORMAT) {
return readStringFast();
}
final int length = readRawVarint32();
if (length < 0) {
throw negativeSize();
}
if (byteBuf.readableBytes() < length) {
throw misreportedSize();
}
byte[] bytes = ThreadLocalBytes.current();
byteBuf.readBytes(bytes, 0, length);
return STRING.deser(bytes, 0, length);
}
private String readStringFast() throws IOException {
byte typ = byteBuf.readByte();
switch (typ) {
case SerializationConstants.STRING_NULL:
return null;
case SerializationConstants.STRING_EMPTY:
return "";
case SerializationConstants.STRING_LATIN1: {
int length = readRawVarint32();
if (length < 0) {
throw negativeSize();
}
if (byteBuf.readableBytes() < length) {
throw misreportedSize();
}
byte[] bytes = new byte[length];
byteBuf.readBytes(bytes, 0, length);
return UnsafeStringUtils.toLatin1String(bytes);
}
case SerializationConstants.STRING_UTF8: {
int length = readRawVarint32();
if (length < 0) {
throw negativeSize();
}
if (byteBuf.readableBytes() < length) {
throw misreportedSize();
}
byte[] bytes = ThreadLocalBytes.current();
byteBuf.readBytes(bytes, 0, length);
return STRING.deser(bytes, 0, length);
}
default:
return null;
}
}
@Override
public ByteString readBytes() throws IOException {
return ByteString.wrap(readByteArray());
}
@Override
public void readBytes(final ByteBuffer bb) throws IOException {
final int length = readRawVarint32();
if (length < 0)
throw negativeSize();
if (byteBuf.readableBytes() < length)
throw misreportedSize();
byteBuf.readBytes(bb);
}
@Override
public byte[] readByteArray() throws IOException {
final int length = readRawVarint32();
if (length < 0)
throw negativeSize();
if (byteBuf.readableBytes() < length)
// if(offset + length > limit)
throw misreportedSize();
final byte[] copy = new byte[length];
byteBuf.readBytes(copy);
return copy;
}
@Override
public T mergeObject(T value, final Schema schema) throws IOException {
if (decodeNestedMessageAsGroup)
return mergeObjectEncodedAsGroup(value, schema);
final int length = readRawVarint32();
if (length < 0)
throw negativeSize();
if (byteBuf.readableBytes() < length)
throw misreportedSize();
ByteBuf dup = byteBuf.slice();
dup.readerIndex(length);
// save old limit
// final int oldLimit = this.limit;
// this.limit = offset + length;
if (value == null)
value = schema.newMessage();
ByteBufInput nestedInput = new ByteBufInput(dup, decodeNestedMessageAsGroup);
schema.mergeFrom(nestedInput, value);
if (!schema.isInitialized(value))
throw new UninitializedMessageException(value, schema);
nestedInput.checkLastTagWas(0);
// checkLastTagWas(0);
// restore old limit
// this.limit = oldLimit;
byteBuf.readerIndex(byteBuf.readerIndex() + length);
return value;
}
private T mergeObjectEncodedAsGroup(T value, final Schema schema) throws IOException {
if (value == null)
value = schema.newMessage();
schema.mergeFrom(this, value);
if (!schema.isInitialized(value))
throw new UninitializedMessageException(value, schema);
// handling is in #readFieldNumber
checkLastTagWas(0);
return value;
}
/**
* Reads a var int 32 from the internal byte buffer.
*/
public int readRawVarint32() throws IOException {
return ByteBufUtils.readVarInt(byteBuf);
}
/**
* Reads a var int 64 from the internal byte buffer.
*/
public long readRawVarint64() throws IOException {
return ByteBufUtils.readVarLong(byteBuf);
}
/**
* Read a 32-bit little-endian integer from the internal buffer.
*/
public int readRawLittleEndian32() throws IOException {
return byteBuf.readIntLE();
}
/**
* Read a 64-bit little-endian integer from the internal byte buffer.
*/
public long readRawLittleEndian64() throws IOException {
return byteBuf.readLongLE();
}
@Override
public void transferByteRangeTo(Output output, boolean utf8String, int fieldNumber, boolean repeated)
throws IOException {
final int length = readRawVarint32();
if (length < 0)
throw negativeSize();
if (utf8String) {
// if it is a UTF string, we have to call the writeByteRange.
if (byteBuf.hasArray()) {
output.writeByteRange(true, fieldNumber, byteBuf.array(), byteBuf.arrayOffset() + byteBuf.readerIndex(),
length, repeated);
byteBuf.readerIndex(byteBuf.readerIndex() + length);
} else {
byte[] bytes = new byte[length];
byteBuf.readBytes(bytes);
output.writeByteRange(true, fieldNumber, bytes, 0, bytes.length, repeated);
}
} else {
// Do the potentially vastly more efficient potential splice call.
if (byteBuf.readableBytes() < length)
throw misreportedSize();
ByteBuf dup = byteBuf.slice();
dup.readerIndex(length);
if (output instanceof ByteBufOutput) {
((ByteBufOutput) output).writeBytes(fieldNumber, dup, repeated);
} else {
ByteBuffer dst = ByteBuffer.allocate(byteBuf.readableBytes());
dup.readBytes(dst);
output.writeBytes(fieldNumber, dst, repeated);
}
byteBuf.readerIndex(byteBuf.readerIndex() + length);
}
// output.writeByteRange(utf8String, fieldNumber, buffer, offset, length,
// repeated);
//
// offset += length;
}
/**
* Reads a byte array/ByteBuffer value.
*/
@Override
public ByteBuffer readByteBuffer() throws IOException {
return ByteBuffer.wrap(readByteArray());
}
}
