42 lines
949 B
Go
42 lines
949 B
Go
// Package tlv implements a simple Type Length Value encoder for nostr NIP-19
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// bech32 encoded entities. The format is generic and could also be used for any
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// TLV use case where fields are less than 255 bytes.
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package tlv
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import (
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"io"
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)
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const (
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Default byte = iota
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Relay
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Author
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Kind
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)
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// ReadEntry reads a TLV value from a bech32 encoded nostr entity.
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func ReadEntry(buf io.Reader) (typ uint8, value []byte) {
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var err error
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t := make([]byte, 1)
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if _, err = buf.Read(t); err != nil {
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return
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}
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typ = t[0]
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l := make([]byte, 1)
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if _, err = buf.Read(l); err != nil {
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return
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}
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length := int(l[0])
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value = make([]byte, length)
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if _, err = buf.Read(value); err != nil {
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// nil value signals end of data or error
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value = nil
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}
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return
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}
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// WriteEntry writes a TLV value for a bech32 encoded nostr entity.
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func WriteEntry(buf io.Writer, typ uint8, value []byte) {
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buf.Write(append([]byte{typ, byte(len(value))}, value...))
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}
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