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tape: Add String method to Tag

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This commit is contained in:
Sasha Koshka 2025-06-24 14:37:45 -04:00
parent e3487d26a1
commit 477e56d359
1 changed files with 26 additions and 10 deletions
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36
tape/tag.go
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@ -1,16 +1,18 @@
package tape
import "fmt"
type Tag byte; const (
SI Tag = 0 << 5 // Small integer
LI Tag = 1 << 5 // Large integer
FP Tag = 2 << 5 // Floating point
SBA Tag = 3 << 5 // Small byte array
LBA Tag = 4 << 5 // Large byte array
OTA Tag = 5 << 5 // One-tag array
KTV Tag = 6 << 5 // Key-tag-value table
TNMask Tag = 0xE0 // The entire TN bitfield
CNMask Tag = 0x20 // The entire CN bitfield
CNLimit Tag = 32 // All valid CNs are < CNLimit
SI Tag = 0 << 5 // Small integer
LI Tag = 1 << 5 // Large integer
FP Tag = 2 << 5 // Floating point
SBA Tag = 3 << 5 // Small byte array
LBA Tag = 4 << 5 // Large byte array
OTA Tag = 5 << 5 // One-tag array
KTV Tag = 6 << 5 // Key-tag-value table
TNMask Tag = 0xE0 // The entire TN bitfield
CNMask Tag = 0x1F // The entire CN bitfield
CNLimit Tag = 32 // All valid CNs are < CNLimit
)
func (tag Tag) TN() int {
@ -33,6 +35,20 @@ func (tag Tag) Is(other Tag) bool {
return tag.TN() == other.TN()
}
func (tag Tag) String() string {
tn := fmt.Sprint(tag.TN())
switch tag.WithoutCN() {
case SI: tn = "SI"
case LI: tn = "LI"
case FP: tn = "FP"
case SBA: tn = "SBA"
case LBA: tn = "LBA"
case OTA: tn = "OTA"
case KTV: tn = "KTV"
}
return fmt.Sprintf("%s:%d", tn, tag.CN())
}
// BufferTag returns the appropriate tag for a buffer.
func BufferTag(value []byte) Tag {
return bufferLenTag(len(value))