31 lines
845 B
Go
31 lines
845 B
Go
package utils
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import (
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"bytes"
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"fmt"
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)
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// Uint24 represents an integer existing out of 3 bytes. It is actually a
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// uint32, but is an alias for the sake of clarity.
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type Uint24 uint32
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// ReadUint24 reads 3 bytes from the buffer passed and combines it into a
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// uint24. If there were no 3 bytes to read, an error is returned.
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func ReadUint24(b *bytes.Buffer) (Uint24, error) {
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ba, _ := b.ReadByte()
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bb, _ := b.ReadByte()
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bc, err := b.ReadByte()
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if err != nil {
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return 0, fmt.Errorf("error reading uint24: %v", err)
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}
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return Uint24(ba) | (Uint24(bb) << 8) | (Uint24(bc) << 16), nil
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}
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// WriteUint24 writes a uint24 to the buffer passed as 3 bytes. If not
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// successful, an error is returned.
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func WriteUint24(b *bytes.Buffer, value Uint24) {
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b.WriteByte(byte(value))
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b.WriteByte(byte(value >> 8))
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b.WriteByte(byte(value >> 16))
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}
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