| // Protocol Buffers - Google's data interchange format |
| // Copyright 2013 Google Inc. All rights reserved. |
| // https://developers.google.com/protocol-buffers/ |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| package com.google.protobuf.nano; |
| |
| import java.io.IOException; |
| |
| /** |
| * This class is used internally by the Protocol Buffer library and generated |
| * message implementations. It is public only because those generated messages |
| * do not reside in the {@code protobuf} package. Others should not use this |
| * class directly. |
| * |
| * This class contains constants and helper functions useful for dealing with |
| * the Protocol Buffer wire format. |
| * |
| * @author kenton@google.com Kenton Varda |
| */ |
| public final class WireFormatNano { |
| // Do not allow instantiation. |
| private WireFormatNano() {} |
| |
| static final int WIRETYPE_VARINT = 0; |
| static final int WIRETYPE_FIXED64 = 1; |
| static final int WIRETYPE_LENGTH_DELIMITED = 2; |
| static final int WIRETYPE_START_GROUP = 3; |
| static final int WIRETYPE_END_GROUP = 4; |
| static final int WIRETYPE_FIXED32 = 5; |
| |
| static final int TAG_TYPE_BITS = 3; |
| static final int TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1; |
| |
| /** Given a tag value, determines the wire type (the lower 3 bits). */ |
| static int getTagWireType(final int tag) { |
| return tag & TAG_TYPE_MASK; |
| } |
| |
| /** Given a tag value, determines the field number (the upper 29 bits). */ |
| public static int getTagFieldNumber(final int tag) { |
| return tag >>> TAG_TYPE_BITS; |
| } |
| |
| /** Makes a tag value given a field number and wire type. */ |
| static int makeTag(final int fieldNumber, final int wireType) { |
| return (fieldNumber << TAG_TYPE_BITS) | wireType; |
| } |
| |
| public static final int EMPTY_INT_ARRAY[] = {}; |
| public static final long EMPTY_LONG_ARRAY[] = {}; |
| public static final float EMPTY_FLOAT_ARRAY[] = {}; |
| public static final double EMPTY_DOUBLE_ARRAY[] = {}; |
| public static final boolean EMPTY_BOOLEAN_ARRAY[] = {}; |
| public static final String EMPTY_STRING_ARRAY[] = {}; |
| public static final byte[] EMPTY_BYTES_ARRAY[] = {}; |
| public static final byte[] EMPTY_BYTES = {}; |
| |
| /** |
| * Parses an unknown field. This implementation skips the field. |
| * |
| * <p>Generated messages will call this for unknown fields if the store_unknown_fields |
| * option is off. |
| * |
| * @return {@literal true} unless the tag is an end-group tag. |
| */ |
| public static boolean parseUnknownField( |
| final CodedInputByteBufferNano input, |
| final int tag) throws IOException { |
| return input.skipField(tag); |
| } |
| |
| /** |
| * Computes the array length of a repeated field. We assume that in the common case repeated |
| * fields are contiguously serialized but we still correctly handle interspersed values of a |
| * repeated field (but with extra allocations). |
| * |
| * Rewinds to current input position before returning. |
| * |
| * @param input stream input, pointing to the byte after the first tag |
| * @param tag repeated field tag just read |
| * @return length of array |
| * @throws IOException |
| */ |
| public static final int getRepeatedFieldArrayLength( |
| final CodedInputByteBufferNano input, |
| final int tag) throws IOException { |
| int arrayLength = 1; |
| int startPos = input.getPosition(); |
| input.skipField(tag); |
| while (input.readTag() == tag) { |
| input.skipField(tag); |
| arrayLength++; |
| } |
| input.rewindToPosition(startPos); |
| return arrayLength; |
| } |
| |
| } |