size.go RawHistoryFolder

1package protocol
2
3import (
4	"math"
5
6	"github.com/bnema/vev/internal/domain"
7)
8
9// MaxWireScreenCells bounds every terminal size carried by the final wire
10// protocol. The uint16 dimension limit is checked separately.
11const MaxWireScreenCells = 1 << 18
12
13// ValidateSize validates a terminal size before a codec allocates or mutates
14// state.
15func ValidateSize(size domain.Size) error {
16	if size.Cols <= 0 || size.Rows <= 0 || size.Cols > math.MaxUint16 || size.Rows > math.MaxUint16 {
17		return ErrInvalidSize
18	}
19	if size.Rows > MaxWireScreenCells/size.Cols {
20		return ErrInvalidSize
21	}
22	return nil
23}
24
25// ValidateGeometry validates cell geometry and its optional uint16 pixel pair.
26func ValidateGeometry(geometry domain.Geometry) error {
27	if err := ValidateSize(geometry.Size); err != nil {
28		return err
29	}
30	if geometry.PixelWidth == 0 && geometry.PixelHeight == 0 {
31		return nil
32	}
33	if geometry.PixelWidth <= 0 || geometry.PixelHeight <= 0 || geometry.PixelWidth > math.MaxUint16 || geometry.PixelHeight > math.MaxUint16 {
34		return ErrInvalidSize
35	}
36	return nil
37}