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tape: Improve table decoding

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Sasha Koshka 2025-05-18 16:08:47 -04:00
parent f50b2ca0cd
commit 568431f4c3
1 changed files with 13 additions and 16 deletions
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19
tape/table.go
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@ -1,27 +1,24 @@
package tape package tape
import "iter"
// encoding and decoding functions must not make any allocations // encoding and decoding functions must not make any allocations
type TablePushFunc func(tag uint16, value []byte) (n int, err error) type TablePushFunc func(tag uint16, value []byte) (n int, err error)
func DecodeTable(data []byte) iter.Seq2[uint16, []byte] { type TablePullFunc func() (tag uint16, value []byte, n int, err error)
return func(yield func(tag uint16, value []byte) bool) {
n := 0 func DecodeTable(data []byte) TablePullFunc {
for { return func() (tag uint16, value []byte, n int, err error) {
tag, nn, err := DecodeI16[uint16](data[n:]) tag, nn, err := DecodeI16[uint16](data[n:])
if err != nil { return } if err != nil { return tag, value, n, err }
n += nn n += nn
length, nn, err := DecodeGBEU[uint64](data[n:]) length, nn, err := DecodeGBEU[uint64](data[n:])
if err != nil { return } if err != nil { return tag, value, n, err }
n += nn n += nn
value := data[n:n + int(length)] value = data[n:n + int(length)]
yield(tag, value)
n += int(length) n += int(length)
} return tag, value, n, err
} }
} }