105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
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/*
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Copyright IBM Corp. 2016 All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"bytes"
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"encoding/binary"
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)
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func decodeInt32(input []byte) (int32, []byte, error) {
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var myint32 int32
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buf1 := bytes.NewBuffer(input[0:4])
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binary.Read(buf1, binary.LittleEndian, &myint32)
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return myint32, input, nil
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}
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// ReadVarInt reads an int that is formatted in the Bitcoin style
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// variable int format
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func ReadVarInt(buffer *bytes.Buffer) uint64 {
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var finalResult uint64
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var variableLenInt uint8
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binary.Read(buffer, binary.LittleEndian, &variableLenInt)
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if variableLenInt < 253 {
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finalResult = uint64(variableLenInt)
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} else if variableLenInt == 253 {
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var result uint16
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binary.Read(buffer, binary.LittleEndian, &result)
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finalResult = uint64(result)
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} else if variableLenInt == 254 {
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var result uint32
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binary.Read(buffer, binary.LittleEndian, &result)
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finalResult = uint64(result)
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} else if variableLenInt == 255 {
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var result uint64
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binary.Read(buffer, binary.LittleEndian, &result)
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finalResult = result
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}
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return finalResult
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}
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// ParseUTXOBytes parses a bitcoin style transaction
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func ParseUTXOBytes(txAsUTXOBytes []byte) *TX {
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buffer := bytes.NewBuffer(txAsUTXOBytes)
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var version int32
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binary.Read(buffer, binary.LittleEndian, &version)
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inputCount := ReadVarInt(buffer)
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newTX := &TX{}
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for i := 0; i < int(inputCount); i++ {
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newTXIN := &TX_TXIN{}
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newTXIN.SourceHash = buffer.Next(32)
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binary.Read(buffer, binary.LittleEndian, &newTXIN.Ix)
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// Parse the script length and script bytes
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scriptLength := ReadVarInt(buffer)
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newTXIN.Script = buffer.Next(int(scriptLength))
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// Appears to not be used currently
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binary.Read(buffer, binary.LittleEndian, &newTXIN.Sequence)
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newTX.Txin = append(newTX.Txin, newTXIN)
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}
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// Now the outputs
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outputCount := ReadVarInt(buffer)
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for i := 0; i < int(outputCount); i++ {
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newTXOUT := &TX_TXOUT{}
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binary.Read(buffer, binary.LittleEndian, &newTXOUT.Value)
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// Parse the script length and script bytes
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scriptLength := ReadVarInt(buffer)
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newTXOUT.Script = buffer.Next(int(scriptLength))
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newTX.Txout = append(newTX.Txout, newTXOUT)
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}
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binary.Read(buffer, binary.LittleEndian, &newTX.LockTime)
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return newTX
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}
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