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node_modules/fontkit/src/cff/CFFIndex.js
| 150 lines
| 3.2 KiB
| application/javascript
| JavascriptGenshiLexer
|
| r789 | import r from 'restructure'; | |||
| export default class CFFIndex { | ||||
| constructor(type) { | ||||
| this.type = type; | ||||
| } | ||||
| getCFFVersion(ctx) { | ||||
| while (ctx && !ctx.hdrSize) { | ||||
| ctx = ctx.parent; | ||||
| } | ||||
| return ctx ? ctx.version : -1; | ||||
| } | ||||
| decode(stream, parent) { | ||||
| let version = this.getCFFVersion(parent); | ||||
| let count = version >= 2 | ||||
| ? stream.readUInt32BE() | ||||
| : stream.readUInt16BE(); | ||||
| if (count === 0) { | ||||
| return []; | ||||
| } | ||||
| let offSize = stream.readUInt8(); | ||||
| let offsetType; | ||||
| if (offSize === 1) { | ||||
| offsetType = r.uint8; | ||||
| } else if (offSize === 2) { | ||||
| offsetType = r.uint16; | ||||
| } else if (offSize === 3) { | ||||
| offsetType = r.uint24; | ||||
| } else if (offSize === 4) { | ||||
| offsetType = r.uint32; | ||||
| } else { | ||||
| throw new Error(`Bad offset size in CFFIndex: ${offSize} ${stream.pos}`); | ||||
| } | ||||
| let ret = []; | ||||
| let startPos = stream.pos + ((count + 1) * offSize) - 1; | ||||
| let start = offsetType.decode(stream); | ||||
| for (let i = 0; i < count; i++) { | ||||
| let end = offsetType.decode(stream); | ||||
| if (this.type != null) { | ||||
| let pos = stream.pos; | ||||
| stream.pos = startPos + start; | ||||
| parent.length = end - start; | ||||
| ret.push(this.type.decode(stream, parent)); | ||||
| stream.pos = pos; | ||||
| } else { | ||||
| ret.push({ | ||||
| offset: startPos + start, | ||||
| length: end - start | ||||
| }); | ||||
| } | ||||
| start = end; | ||||
| } | ||||
| stream.pos = startPos + start; | ||||
| return ret; | ||||
| } | ||||
| size(arr, parent) { | ||||
| let size = 2; | ||||
| if (arr.length === 0) { | ||||
| return size; | ||||
| } | ||||
| let type = this.type || new r.Buffer; | ||||
| // find maximum offset to detminine offset type | ||||
| let offset = 1; | ||||
| for (let i = 0; i < arr.length; i++) { | ||||
| let item = arr[i]; | ||||
| offset += type.size(item, parent); | ||||
| } | ||||
| let offsetType; | ||||
| if (offset <= 0xff) { | ||||
| offsetType = r.uint8; | ||||
| } else if (offset <= 0xffff) { | ||||
| offsetType = r.uint16; | ||||
| } else if (offset <= 0xffffff) { | ||||
| offsetType = r.uint24; | ||||
| } else if (offset <= 0xffffffff) { | ||||
| offsetType = r.uint32; | ||||
| } else { | ||||
| throw new Error("Bad offset in CFFIndex"); | ||||
| } | ||||
| size += 1 + offsetType.size() * (arr.length + 1); | ||||
| size += offset - 1; | ||||
| return size; | ||||
| } | ||||
| encode(stream, arr, parent) { | ||||
| stream.writeUInt16BE(arr.length); | ||||
| if (arr.length === 0) { | ||||
| return; | ||||
| } | ||||
| let type = this.type || new r.Buffer; | ||||
| // find maximum offset to detminine offset type | ||||
| let sizes = []; | ||||
| let offset = 1; | ||||
| for (let item of arr) { | ||||
| let s = type.size(item, parent); | ||||
| sizes.push(s); | ||||
| offset += s; | ||||
| } | ||||
| let offsetType; | ||||
| if (offset <= 0xff) { | ||||
| offsetType = r.uint8; | ||||
| } else if (offset <= 0xffff) { | ||||
| offsetType = r.uint16; | ||||
| } else if (offset <= 0xffffff) { | ||||
| offsetType = r.uint24; | ||||
| } else if (offset <= 0xffffffff) { | ||||
| offsetType = r.uint32; | ||||
| } else { | ||||
| throw new Error("Bad offset in CFFIndex"); | ||||
| } | ||||
| // write offset size | ||||
| stream.writeUInt8(offsetType.size()); | ||||
| // write elements | ||||
| offset = 1; | ||||
| offsetType.encode(stream, offset); | ||||
| for (let size of sizes) { | ||||
| offset += size; | ||||
| offsetType.encode(stream, offset); | ||||
| } | ||||
| for (let item of arr) { | ||||
| type.encode(stream, item, parent); | ||||
| } | ||||
| return; | ||||
| } | ||||
| } | ||||