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@ -1,14 +1,18 @@ |
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package parser |
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import ( |
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"bytes" |
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"crypto/sha256" |
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"encoding/binary" |
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"io" |
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"log" |
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"github.com/pkg/errors" |
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) |
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const ( |
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EQUIHASH_SIZE = 1344 // size of an Equihash solution in bytes
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EQUIHASH_SIZE = 1344 // size of an Equihash solution in bytes
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SER_BLOCK_HEADER_SIZE = 1487 // size of a serialized block header
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) |
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// A block header as defined in version 2018.0-beta-29 of the Zcash Protocol Spec.
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@ -55,11 +59,11 @@ type RawBlockHeader struct { |
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// EquihashSize is a concrete instance of Bitcoin's CompactSize encoding.
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type EquihashSize struct { |
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_ byte // always the byte value 253
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Size uint16 // always 1344
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SizeTag byte // always the byte value 253
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Size uint16 // always 1344
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} |
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func ReadBlockHeader(r io.Reader) (*RawBlockHeader, error) { |
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func readRawBlockHeader(r io.Reader) (*RawBlockHeader, error) { |
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var blockHeader RawBlockHeader |
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err := binary.Read(r, binary.LittleEndian, &blockHeader) |
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if err != nil { |
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@ -67,3 +71,34 @@ func ReadBlockHeader(r io.Reader) (*RawBlockHeader, error) { |
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} |
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return &blockHeader, nil |
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} |
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func (hdr *RawBlockHeader) MarshalBinary() ([]byte, error) { |
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serBytes := make([]byte, 0, SER_BLOCK_HEADER_SIZE) |
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serBuf := bytes.NewBuffer(serBytes) |
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err := binary.Write(serBuf, binary.LittleEndian, hdr) |
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return serBytes[:SER_BLOCK_HEADER_SIZE], err |
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} |
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type BlockHeader struct { |
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*RawBlockHeader |
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cachedBlockHash []byte |
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} |
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func (hdr *BlockHeader) GetBlockHash() []byte { |
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if hdr.cachedBlockHash != nil { |
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return hdr.cachedBlockHash |
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} |
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serializedHeader, err := hdr.MarshalBinary() |
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if err != nil { |
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log.Fatalf("error marshaling block header: %v", err) |
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return nil |
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} |
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// SHA256d
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digest := sha256.Sum256(serializedHeader) |
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digest = sha256.Sum256(digest[:]) |
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hdr.cachedBlockHash = digest[:] |
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return hdr.cachedBlockHash |
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} |
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