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import r from 'restructure';
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let SubHeader = new r.Struct({
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firstCode: r.uint16,
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entryCount: r.uint16,
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idDelta: r.int16,
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idRangeOffset: r.uint16
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});
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let CmapGroup = new r.Struct({
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startCharCode: r.uint32,
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endCharCode: r.uint32,
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glyphID: r.uint32
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});
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let UnicodeValueRange = new r.Struct({
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startUnicodeValue: r.uint24,
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additionalCount: r.uint8
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});
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let UVSMapping = new r.Struct({
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unicodeValue: r.uint24,
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glyphID: r.uint16
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});
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let DefaultUVS = new r.Array(UnicodeValueRange, r.uint32);
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let NonDefaultUVS = new r.Array(UVSMapping, r.uint32);
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let VarSelectorRecord = new r.Struct({
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varSelector: r.uint24,
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defaultUVS: new r.Pointer(r.uint32, DefaultUVS, {type: 'parent'}),
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nonDefaultUVS: new r.Pointer(r.uint32, NonDefaultUVS, {type: 'parent'})
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});
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let CmapSubtable = new r.VersionedStruct(r.uint16, {
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0: { // Byte encoding
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length: r.uint16, // Total table length in bytes (set to 262 for format 0)
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language: r.uint16, // Language code for this encoding subtable, or zero if language-independent
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codeMap: new r.LazyArray(r.uint8, 256)
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},
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2: { // High-byte mapping (CJK)
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length: r.uint16,
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language: r.uint16,
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subHeaderKeys: new r.Array(r.uint16, 256),
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subHeaderCount: t => Math.max.apply(Math, t.subHeaderKeys),
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subHeaders: new r.LazyArray(SubHeader, 'subHeaderCount'),
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glyphIndexArray: new r.LazyArray(r.uint16, 'subHeaderCount')
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},
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4: { // Segment mapping to delta values
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length: r.uint16, // Total table length in bytes
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language: r.uint16, // Language code
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segCountX2: r.uint16,
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segCount: t => t.segCountX2 >> 1,
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searchRange: r.uint16,
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entrySelector: r.uint16,
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rangeShift: r.uint16,
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endCode: new r.LazyArray(r.uint16, 'segCount'),
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reservedPad: new r.Reserved(r.uint16), // This value should be zero
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startCode: new r.LazyArray(r.uint16, 'segCount'),
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idDelta: new r.LazyArray(r.int16, 'segCount'),
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idRangeOffset: new r.LazyArray(r.uint16, 'segCount'),
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glyphIndexArray: new r.LazyArray(r.uint16, t => (t.length - t._currentOffset) / 2)
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},
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6: { // Trimmed table
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length: r.uint16,
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language: r.uint16,
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firstCode: r.uint16,
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entryCount: r.uint16,
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glyphIndices: new r.LazyArray(r.uint16, 'entryCount')
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},
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8: { // mixed 16-bit and 32-bit coverage
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reserved: new r.Reserved(r.uint16),
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length: r.uint32,
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language: r.uint16,
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is32: new r.LazyArray(r.uint8, 8192),
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nGroups: r.uint32,
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groups: new r.LazyArray(CmapGroup, 'nGroups')
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},
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10: { // Trimmed Array
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reserved: new r.Reserved(r.uint16),
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length: r.uint32,
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language: r.uint32,
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firstCode: r.uint32,
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entryCount: r.uint32,
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glyphIndices: new r.LazyArray(r.uint16, 'numChars')
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},
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12: { // Segmented coverage
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reserved: new r.Reserved(r.uint16),
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length: r.uint32,
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language: r.uint32,
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nGroups: r.uint32,
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groups: new r.LazyArray(CmapGroup, 'nGroups')
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},
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13: { // Many-to-one range mappings (same as 12 except for group.startGlyphID)
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reserved: new r.Reserved(r.uint16),
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length: r.uint32,
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language: r.uint32,
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nGroups: r.uint32,
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groups: new r.LazyArray(CmapGroup, 'nGroups')
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},
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14: { // Unicode Variation Sequences
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length: r.uint32,
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numRecords: r.uint32,
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varSelectors: new r.LazyArray(VarSelectorRecord, 'numRecords')
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}
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});
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let CmapEntry = new r.Struct({
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platformID: r.uint16, // Platform identifier
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encodingID: r.uint16, // Platform-specific encoding identifier
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table: new r.Pointer(r.uint32, CmapSubtable, {type: 'parent', lazy: true})
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});
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// character to glyph mapping
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export default new r.Struct({
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version: r.uint16,
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numSubtables: r.uint16,
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tables: new r.Array(CmapEntry, 'numSubtables')
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});
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