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import r from '@foliojs-fork/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;
}
}