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