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| SegmentToDelta | |
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| shiftToSigned | |
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| 1 | <?php |
| 2 | /** |
| 3 | * Pop PHP Framework (http://www.popphp.org/) |
| 4 | * |
| 5 | * @link https://github.com/popphp/popphp-framework |
| 6 | * @author Nick Sagona, III <dev@nolainteractive.com> |
| 7 | * @copyright Copyright (c) 2009-2024 NOLA Interactive, LLC. (http://www.nolainteractive.com) |
| 8 | * @license http://www.popphp.org/license New BSD License |
| 9 | */ |
| 10 | |
| 11 | /** |
| 12 | * @namespace |
| 13 | */ |
| 14 | namespace Pop\Pdf\Build\Font\TrueType\Table\Cmap; |
| 15 | |
| 16 | /** |
| 17 | * CMAP segment-to-delta table class |
| 18 | * |
| 19 | * @category Pop |
| 20 | * @package Pop\Pdf |
| 21 | * @author Nick Sagona, III <dev@nolainteractive.com> |
| 22 | * @copyright Copyright (c) 2009-2024 NOLA Interactive, LLC. (http://www.nolainteractive.com) |
| 23 | * @license http://www.popphp.org/license New BSD License |
| 24 | * @version 5.0.0 |
| 25 | */ |
| 26 | class SegmentToDelta |
| 27 | { |
| 28 | |
| 29 | /** |
| 30 | * Method to parse the Segment to Delta (Format 4) CMAP data |
| 31 | * |
| 32 | * @param string $data |
| 33 | * @return array |
| 34 | */ |
| 35 | public static function parseData(string $data): array |
| 36 | { |
| 37 | $ary = unpack( |
| 38 | 'nsegCountx2/' . |
| 39 | 'nsearchRange/' . |
| 40 | 'nentrySelector/' . |
| 41 | 'nrangeShift', substr($data, 0, 8) |
| 42 | ); |
| 43 | |
| 44 | $ary['segCount'] = $ary['segCountx2'] / 2; |
| 45 | $ary['endCount'] = array(); |
| 46 | |
| 47 | $bytePos = 8; |
| 48 | for ($i = 0; $i < $ary['segCount']; $i++) { |
| 49 | $ar = unpack('nendCount', substr($data, $bytePos, 2)); |
| 50 | $ary['endCount'][$i] = $ar['endCount']; |
| 51 | $bytePos += 2; |
| 52 | } |
| 53 | |
| 54 | $ar = unpack('nreservedPad', substr($data, $bytePos, 2)); |
| 55 | $bytePos += 2; |
| 56 | |
| 57 | $ary['reservedPad'] = $ar['reservedPad']; |
| 58 | |
| 59 | $ary['startCount'] = array(); |
| 60 | |
| 61 | for ($i = 0; $i < $ary['segCount']; $i++) { |
| 62 | $ar = unpack('nstartCount', substr($data, $bytePos, 2)); |
| 63 | $ary['startCount'][$i] = $ar['startCount']; |
| 64 | $bytePos += 2; |
| 65 | } |
| 66 | |
| 67 | $ary['idDelta'] = array(); |
| 68 | |
| 69 | for ($i = 0; $i < $ary['segCount']; $i++) { |
| 70 | $ar = unpack('nidDelta', substr($data, $bytePos, 2)); |
| 71 | $ary['idDelta'][$i] = self::shiftToSigned($ar['idDelta']); |
| 72 | $bytePos += 2; |
| 73 | } |
| 74 | |
| 75 | $ary['idRangeOffset'] = array(); |
| 76 | |
| 77 | for ($i = 0; $i < $ary['segCount']; $i++) { |
| 78 | $ar = unpack('nidRangeOffset', substr($data, $bytePos, 2)); |
| 79 | $ary['idRangeOffset'][$i] = $ar['idRangeOffset'] >> 1; |
| 80 | $bytePos += 2; |
| 81 | } |
| 82 | |
| 83 | $ary['glyphIndexArray'] = array(); |
| 84 | |
| 85 | for (; $bytePos < strlen($data); $bytePos += 2) { |
| 86 | $ar = unpack('nglyphIndex', substr($data, $bytePos, 2)); |
| 87 | $ary['glyphIndexArray'][] = $ar['glyphIndex']; |
| 88 | } |
| 89 | |
| 90 | $ary['glyphNumbers'] = array(); |
| 91 | |
| 92 | for ($segmentNum = 0; $segmentNum < $ary['segCount']; $segmentNum++) { |
| 93 | if ($ary['idRangeOffset'][$segmentNum] == 0) { |
| 94 | $delta = $ary['idDelta'][$segmentNum]; |
| 95 | |
| 96 | for ($code = $ary['startCount'][$segmentNum]; |
| 97 | $code <= $ary['endCount'][$segmentNum]; |
| 98 | $code++) { |
| 99 | $ary['glyphNumbers'][$code] = ($code + $delta) % 65536; |
| 100 | } |
| 101 | } else { |
| 102 | $code = $ary['startCount'][$segmentNum]; |
| 103 | $glyphIndex = $ary['idRangeOffset'][$segmentNum] - ($ary['segCount'] - $segmentNum) - 1; |
| 104 | |
| 105 | while ($code <= $ary['endCount'][$segmentNum]) { |
| 106 | if (isset($ary['glyphIndexArray'][$glyphIndex])) { |
| 107 | $ary['glyphNumbers'][$code] = $ary['glyphIndexArray'][$glyphIndex]; |
| 108 | } |
| 109 | |
| 110 | $code++; |
| 111 | $glyphIndex++; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | $ary['mapData'] = str_repeat("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 8192); |
| 117 | // Fill the index |
| 118 | foreach ($ary['glyphNumbers'] as $charCode => $glyph) { |
| 119 | $ary['mapData'][$charCode * 2] = chr($glyph >> 8); |
| 120 | $ary['mapData'][$charCode * 2 + 1] = chr($glyph & 0xFF); |
| 121 | } |
| 122 | |
| 123 | return $ary; |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Method to shift an unpacked signed short from big endian to little endian |
| 128 | * |
| 129 | * @param int|array $values |
| 130 | * @return int|array |
| 131 | */ |
| 132 | public static function shiftToSigned(int|array $values): int|array |
| 133 | { |
| 134 | if (is_array($values)) { |
| 135 | foreach ($values as $key => $value) { |
| 136 | if ($value >= pow(2, 15)) { |
| 137 | $values[$key] -= pow(2, 16); |
| 138 | } |
| 139 | } |
| 140 | } else { |
| 141 | if ($values >= pow(2, 15)) { |
| 142 | $values -= pow(2, 16); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | return $values; |
| 147 | } |
| 148 | |
| 149 | } |