zxing-js/library

// The Latch Table shows, for each pair of Modes, the optimal method for
// getting from one mode to another.  In the worst possible case, this can
// be up to 14 bits.  In the best possible case, we are already there!
// The high half-word of each entry gives the number of bits.
// The low half-word of each entry are the actual bits necessary to change
export const LATCH_TABLE: Int32Array[] = [
  Int32Array.from([
    0,
    (5 << 16) + 28, // UPPER -> LOWER
    (5 << 16) + 30, // UPPER -> DIGIT
    (5 << 16) + 29, // UPPER -> MIXED
    (10 << 16) + (29 << 5) + 30 // UPPER -> MIXED -> PUNCT
  ]),
  Int32Array.from([
    (9 << 16) + (30 << 4) + 14, // LOWER -> DIGIT -> UPPER
    0,
    (5 << 16) + 30, // LOWER -> DIGIT
    (5 << 16) + 29, // LOWER -> MIXED
    (10 << 16) + (29 << 5) + 30 // LOWER -> MIXED -> PUNCT
  ]),
  Int32Array.from([
    (4 << 16) + 14, // DIGIT -> UPPER
    (9 << 16) + (14 << 5) + 28, // DIGIT -> UPPER -> LOWER
    0,
    (9 << 16) + (14 << 5) + 29, // DIGIT -> UPPER -> MIXED
    (14 << 16) + (14 << 10) + (29 << 5) + 30
    // DIGIT -> UPPER -> MIXED -> PUNCT
  ]),
  Int32Array.from([
    (5 << 16) + 29, // MIXED -> UPPER
    (5 << 16) + 28, // MIXED -> LOWER
    (10 << 16) + (29 << 5) + 30, // MIXED -> UPPER -> DIGIT
    0,
    (5 << 16) + 30 // MIXED -> PUNCT
  ]),
  Int32Array.from([
    (5 << 16) + 31, // PUNCT -> UPPER
    (10 << 16) + (31 << 5) + 28, // PUNCT -> UPPER -> LOWER
    (10 << 16) + (31 << 5) + 30, // PUNCT -> UPPER -> DIGIT
    (10 << 16) + (31 << 5) + 29, // PUNCT -> UPPER -> MIXED
    0
  ])
];