ak47
573d15d7b4
Add opt-in Tentacle protocol 1.1, explicit remote grants, lifecycle IPC and expiring core leases in both SDKs. Revoke access before update preparation, including failed updates. Add transient secret entries, shared Braille cell export and isolated Xorg recovery experiments with focused tests and documented limitations. Production consent, desktop services and live interoperability remain pending.
64 lines
2.2 KiB
Go
64 lines
2.2 KiB
Go
package braille
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import (
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"errors"
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"unicode/utf8"
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)
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// displayMasks is shared by the BrlAPI writer and cell export. A zero AND mask
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// makes a Unicode Braille cell independent of BRLTTY's text translation table.
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// Dots are attributes to OR into the cell, not a replacement cell array.
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func displayMasks(text string, dots []byte) ([]byte, []byte, error) {
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if !utf8.ValidString(text) {
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return nil, nil, errors.New("invalid braille text")
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}
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length := utf8.RuneCountInString(text)
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if len(dots) != 0 && len(dots) != length {
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return nil, nil, errors.New("invalid braille indicator length")
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}
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andMask, orMask := make([]byte, length), make([]byte, length)
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for index, cell := range []rune(text) {
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andMask[index] = 0xff
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if len(dots) != 0 {
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orMask[index] = dots[index]
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}
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if cell >= 0x2800 && cell <= 0x28ff {
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andMask[index] = 0
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orMask[index] |= byte(cell - 0x2800)
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}
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}
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return andMask, orMask, nil
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}
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// rawCells exports a translated viewport without opening a display. It shares
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// the physical writer's cell/attribute handling and the existing viewport's
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// translation, wrapping and routing maps. The caller owns this viewport and
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// serializes all access, independently of any physical viewport.
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//
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// Ordinary text needs BRLTTY translation and is deliberately rejected. Callers
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// must first use the existing liblouis path with an explicitly chosen table.
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// Spaces here are blank padding or the synthetic end-of-line cursor cell.
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// cursorDots is an explicit, static overlay; this does not reproduce BRLTTY's
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// configured cursor shape or blink timing. No native routing metadata is exported.
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func (v *viewport) rawCells(cursorDots byte) ([]byte, error) {
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if _, err := (Geometry{Columns: v.width, Rows: 1}).Cells(); err != nil {
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return nil, err
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}
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text := []rune(v.frame())
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for index, cell := range text {
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if cell == ' ' {
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text[index] = '\u2800'
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} else if cell < 0x2800 || cell > 0x28ff {
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return nil, errors.New("raw braille export requires translated cells")
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}
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}
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_, cells, err := displayMasks(string(text), v.displayDots())
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if err != nil {
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return nil, err
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}
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if cursor := v.displayCursor(); cursor > 0 {
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cells[cursor-1] |= cursorDots
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}
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return cells, nil
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}
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