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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,67 @@ | ||
| package zeropb | ||
|
|
||
| type Slice[T any] struct { | ||
| offset int16 | ||
| length uint16 | ||
| import ( | ||
| "encoding/binary" | ||
| "fmt" | ||
| "math" | ||
| ) | ||
|
|
||
| type Buffer struct { | ||
| buf []byte | ||
| allocated uint16 | ||
| } | ||
|
|
||
| type Allocation struct { | ||
| Buf []byte | ||
| offset uint16 | ||
| } | ||
|
|
||
| func NewBuffer(b []byte) *Buffer { | ||
| if len(b) > math.MaxUint16 { | ||
| b = b[:math.MaxUint16] | ||
| } | ||
| return &Buffer{ | ||
| buf: b, | ||
| } | ||
| } | ||
|
|
||
| func (b *Buffer) Alloc(n int) Allocation { | ||
| n16 := uint16(n) | ||
| if int(n16) != n { | ||
| panic(fmt.Errorf("allocation %d too large", n)) | ||
| } | ||
| a := Allocation{ | ||
| Buf: b.buf[:n16], | ||
| offset: b.allocated, | ||
| } | ||
| b.buf = b.buf[n16:] | ||
| b.allocated += n16 | ||
| return a | ||
| } | ||
|
|
||
| func (b *Buffer) AllocRel(n int, dst Allocation, offset, len uint16) Allocation { | ||
| a := b.Alloc(n) | ||
| bo := binary.LittleEndian | ||
| // Write relative offset and len. | ||
| bo.PutUint16(dst.Buf[offset:], a.offset-dst.offset-offset) | ||
| bo.PutUint16(dst.Buf[offset+2:], len) | ||
| return a | ||
| } | ||
|
|
||
| func (b *Buffer) Allocated() uint16 { | ||
| return b.allocated | ||
| } | ||
|
|
||
| func (a Allocation) Slice(offset uint16) Allocation { | ||
| return Allocation{ | ||
| Buf: a.Buf[offset:], | ||
| offset: a.offset + offset, | ||
| } | ||
| } | ||
|
|
||
| func ReadSlice(buf []byte, offset uint16) (off, len uint16) { | ||
| bo := binary.LittleEndian | ||
| off = offset + bo.Uint16(buf[offset:]) | ||
| len = bo.Uint16(buf[offset+2:]) | ||
| return | ||
| } |
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