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implement a quicvarint.Append method

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This commit is contained in:
Marten Seemann
2022-08-28 22:51:03 +03:00
parent 07412be8a0
commit 65dd82ad90
2 changed files with 48 additions and 0 deletions
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19
quicvarint/varint.go
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@@ -88,6 +88,25 @@ func Write(w Writer, i uint64) {
}
}
func Append(b []byte, i uint64) []byte {
if i <= maxVarInt1 {
return append(b, uint8(i))
}
if i <= maxVarInt2 {
return append(b, []byte{uint8(i>>8) | 0x40, uint8(i)}...)
}
if i <= maxVarInt4 {
return append(b, []byte{uint8(i>>24) | 0x80, uint8(i >> 16), uint8(i >> 8), uint8(i)}...)
}
if i <= maxVarInt8 {
return append(b, []byte{
uint8(i>>56) | 0xc0, uint8(i >> 48), uint8(i >> 40), uint8(i >> 32),
uint8(i >> 24), uint8(i >> 16), uint8(i >> 8), uint8(i),
}...)
}
panic(fmt.Sprintf("%#x doesn't fit into 62 bits", i))
}
// WriteWithLen writes i in the QUIC varint format with the desired length to w.
func WriteWithLen(w Writer, i uint64, length protocol.ByteCount) {
if length != 1 && length != 2 && length != 4 && length != 8 {