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89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
package bitcoin
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// https://learnmeabitcoin.com/technical/blkdat
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import (
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"fmt"
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"time"
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"github.com/wader/fq/format"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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)
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var bitcoinTranscationGroup decode.Group
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func init() {
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interp.RegisterFormat(
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format.Bitcoin_Block,
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&decode.Format{
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Description: "Bitcoin block",
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Dependencies: []decode.Dependency{
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{Groups: []*decode.Group{format.Bitcoin_Transaction}, Out: &bitcoinTranscationGroup},
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},
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DecodeFn: decodeBitcoinBlock,
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DefaultInArg: format.Bitcoin_Block_In{
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HasHeader: false,
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},
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})
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}
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var rawHexReverse = scalar.BitBufFn(func(s scalar.BitBuf) (scalar.BitBuf, error) {
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return scalar.RawSym(s, -1, func(b []byte) string {
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decode.ReverseBytes(b)
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return fmt.Sprintf("%x", b)
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})
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})
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func decodeBitcoinBlock(d *decode.D) any {
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var bbi format.Bitcoin_Block_In
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d.ArgAs(&bbi)
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size := d.BitsLeft()
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if bbi.HasHeader {
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magic := d.PeekUintBits(32)
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switch magic {
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case 0xf9beb4d9,
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0x0b110907,
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0xfabfb5da:
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d.FieldU32("magic", scalar.UintMapSymStr{
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0xf9beb4d9: "mainnet",
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0x0b110907: "testnet3",
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0xfabfb5da: "regtest",
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}, scalar.UintHex)
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size = int64(d.FieldU32LE("size")) * 8
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default:
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d.Fatalf("unknown magic %x", magic)
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}
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}
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d.Endian = decode.LittleEndian
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d.FramedFn(size, func(d *decode.D) {
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d.FieldStruct("header", func(d *decode.D) {
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d.FieldU32("version", scalar.UintHex)
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d.FieldRawLen("previous_block_hash", 32*8, rawHexReverse)
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d.FieldRawLen("merkle_root", 32*8, rawHexReverse)
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d.FieldU32("time", scalar.UintActualUnixTimeDescription(time.Second, time.RFC3339))
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d.FieldU32("bits", scalar.UintHex)
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d.FieldU32("nonce", scalar.UintHex)
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})
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// TODO: remove? support header only decode this way?
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if d.BitsLeft() == 0 {
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return
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}
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txCount := d.FieldUintFn("tx_count", decodeVarInt)
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d.FieldArray("transactions", func(d *decode.D) {
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for i := uint64(0); i < txCount; i++ {
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d.FieldFormat("transaction", &bitcoinTranscationGroup, nil)
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}
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})
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})
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return nil
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}
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