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324 lines
12 KiB
324 lines
12 KiB
#Region "Microsoft.VisualBasic::a487c20f2e9b32a794ac62ca4f91dc86, Google.Protobuf\Stream\CodedOutputStream.ComputeSize.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Class CodedOutputStream
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'
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' Function: ComputeBoolSize, ComputeBytesSize, ComputeDoubleSize, ComputeEnumSize, ComputeFixed32Size
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' ComputeFixed64Size, ComputeFloatSize, ComputeGroupSize, ComputeInt32Size, ComputeInt64Size
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' ComputeLengthSize, ComputeMessageSize, ComputeRawVarint32Size, ComputeRawVarint64Size, ComputeSFixed32Size
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' ComputeSFixed64Size, ComputeSInt32Size, ComputeSInt64Size, ComputeStringSize, ComputeTagSize
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' ComputeUInt32Size, ComputeUInt64Size
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'
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'
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' /********************************************************************************/
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#End Region
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#Region "Copyright notice and license"
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' Protocol Buffers - Google's data interchange format
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' Copyright 2008 Google Inc. All rights reserved.
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' https://developers.google.com/protocol-buffers/
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'
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' Redistribution and use in source and binary forms, with or without
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' modification, are permitted provided that the following conditions are
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' met:
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'
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' * Redistributions of source code must retain the above copyright
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' notice, this list of conditions and the following disclaimer.
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' * Redistributions in binary form must reproduce the above
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' copyright notice, this list of conditions and the following disclaimer
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' in the documentation and/or other materials provided with the
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' distribution.
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' * Neither the name of Google Inc. nor the names of its
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' contributors may be used to endorse or promote products derived from
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' this software without specific prior written permission.
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'
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' THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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' "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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' LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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' A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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' OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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' SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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' LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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' DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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' THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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' (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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' OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#End Region
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Namespace Google.Protobuf
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' This part of CodedOutputStream provides all the static entry points that are used
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' by generated code and internally to compute the size of messages prior to being
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' written to an instance of CodedOutputStream.
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Public NotInheritable Partial Class CodedOutputStream
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Private Const LittleEndian64Size As Integer = 8
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Private Const LittleEndian32Size As Integer = 4
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' double field, including the tag.
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''' </summary>
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Public Shared Function ComputeDoubleSize(value As Double) As Integer
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Return LittleEndian64Size
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' float field, including the tag.
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''' </summary>
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Public Shared Function ComputeFloatSize(value As Single) As Integer
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Return LittleEndian32Size
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' uint64 field, including the tag.
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''' </summary>
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Public Shared Function ComputeUInt64Size(value As ULong) As Integer
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Return ComputeRawVarint64Size(value)
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode an
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''' int64 field, including the tag.
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''' </summary>
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Public Shared Function ComputeInt64Size(value As Long) As Integer
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Return ComputeRawVarint64Size(value)
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode an
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''' int32 field, including the tag.
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''' </summary>
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Public Shared Function ComputeInt32Size(value As Integer) As Integer
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If value >= 0 Then
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Return ComputeRawVarint32Size(value)
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Else
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' Must sign-extend.
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Return 10
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End If
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' fixed64 field, including the tag.
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''' </summary>
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Public Shared Function ComputeFixed64Size(value As ULong) As Integer
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Return LittleEndian64Size
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' fixed32 field, including the tag.
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''' </summary>
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Public Shared Function ComputeFixed32Size(value As UInteger) As Integer
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Return LittleEndian32Size
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' bool field, including the tag.
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''' </summary>
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Public Shared Function ComputeBoolSize(value As Boolean) As Integer
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Return 1
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' string field, including the tag.
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''' </summary>
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Public Shared Function ComputeStringSize(value As String) As Integer
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Dim byteArraySize = Utf8Encoding.GetByteCount(value)
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Return ComputeLengthSize(byteArraySize) + byteArraySize
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' group field, including the tag.
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''' </summary>
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Public Shared Function ComputeGroupSize(value As IMessage) As Integer
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Return value.CalculateSize()
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode an
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''' embedded message field, including the tag.
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''' </summary>
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Public Shared Function ComputeMessageSize(value As IMessage) As Integer
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Dim size As Integer = value.CalculateSize()
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Return ComputeLengthSize(size) + size
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' bytes field, including the tag.
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''' </summary>
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Public Shared Function ComputeBytesSize(value As ByteString) As Integer
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Return ComputeLengthSize(value.Length) + value.Length
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' uint32 field, including the tag.
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''' </summary>
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Public Shared Function ComputeUInt32Size(value As UInteger) As Integer
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Return ComputeRawVarint32Size(value)
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a
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''' enum field, including the tag. The caller is responsible for
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''' converting the enum value to its numeric value.
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''' </summary>
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Public Shared Function ComputeEnumSize(value As Integer) As Integer
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' Currently just a pass-through, but it's nice to separate it logically.
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Return ComputeInt32Size(value)
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode an
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''' sfixed32 field, including the tag.
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''' </summary>
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Public Shared Function ComputeSFixed32Size(value As Integer) As Integer
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Return LittleEndian32Size
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode an
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''' sfixed64 field, including the tag.
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''' </summary>
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Public Shared Function ComputeSFixed64Size(value As Long) As Integer
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Return LittleEndian64Size
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode an
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''' sint32 field, including the tag.
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''' </summary>
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Public Shared Function ComputeSInt32Size(value As Integer) As Integer
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Return ComputeRawVarint32Size(EncodeZigZag32(value))
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode an
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''' sint64 field, including the tag.
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''' </summary>
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Public Shared Function ComputeSInt64Size(value As Long) As Integer
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Return ComputeRawVarint64Size(EncodeZigZag64(value))
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a length,
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''' as written by <see cref="WriteLength"/>.
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''' </summary>
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Public Shared Function ComputeLengthSize(length As Integer) As Integer
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Return ComputeRawVarint32Size(length)
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a varint.
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''' </summary>
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Public Shared Function ComputeRawVarint32Size(value As UInteger) As Integer
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If (value And &HfffffffF << 7) = 0 Then
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Return 1
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End If
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If (value And &HfffffffF << 14) = 0 Then
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Return 2
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End If
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If (value And &HfffffffF << 21) = 0 Then
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Return 3
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End If
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If (value And &HfffffffF << 28) = 0 Then
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Return 4
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End If
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Return 5
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a varint.
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''' </summary>
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Public Shared Function ComputeRawVarint64Size(value As ULong) As Integer
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If (value And &HffffffffffffffffL << 7) = 0 Then
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Return 1
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End If
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If (value And &HffffffffffffffffL << 14) = 0 Then
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Return 2
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End If
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If (value And &HffffffffffffffffL << 21) = 0 Then
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Return 3
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End If
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If (value And &HffffffffffffffffL << 28) = 0 Then
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Return 4
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End If
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If (value And &HffffffffffffffffL << 35) = 0 Then
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Return 5
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End If
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If (value And &HffffffffffffffffL << 42) = 0 Then
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Return 6
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End If
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If (value And &HffffffffffffffffL << 49) = 0 Then
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Return 7
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End If
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If (value And &HffffffffffffffffL << 56) = 0 Then
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Return 8
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End If
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If (value And &HffffffffffffffffL << 63) = 0 Then
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Return 9
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End If
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Return 10
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End Function
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''' <summary>
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''' Computes the number of bytes that would be needed to encode a tag.
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''' </summary>
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Public Shared Function ComputeTagSize(fieldNumber As Integer) As Integer
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Return ComputeRawVarint32Size(MakeTag(fieldNumber, 0))
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End Function
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End Class
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End Namespace
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