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Rebuild endian-reader as class

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This commit is contained in:
Sam Carlton 2022-07-21 22:42:26 -05:00
parent 53e8a95933
commit 07ee8760b5
2 changed files with 222 additions and 1 deletions
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221
helpers/scanner/parsers/macho-node/endian-reader.js Normal file
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@ -0,0 +1,221 @@
export class Reader {
constructor( endian, word ) {
this.endian = null
this.word = 4
if (endian)
this.setEndian(endian)
if (word)
this.setWord(word)
}
setEndian(endian) {
this.endian = /le|lsb|little/i.test(endian) ? 'le' : 'be';
}
setWord(word) {
this.word = word;
}
readUInt8(buf, offset) {
return buf.readUInt8(offset);
}
readInt8(buf, offset) {
return buf.readInt8(offset);
}
readUInt16(buf, offset) {
if (this.endian === 'le')
return buf.readUInt16LE(offset);
else
return buf.readUInt16BE(offset);
}
readInt16(buf, offset) {
if (this.endian === 'le')
return buf.readInt16LE(offset);
else
return buf.readInt16BE(offset);
}
readUInt32(buf, offset) {
if (this.endian === 'le')
return buf.readUInt32LE(offset);
else
return buf.readUInt32BE(offset);
}
readInt32(buf, offset) {
if (this.endian === 'le')
return buf.readInt32LE(offset);
else
return buf.readInt32BE(offset);
}
readUInt64(buf, offset) {
var a = this.readUInt32(buf, offset);
var b = this.readUInt32(buf, offset + 4);
if (this.endian === 'le')
return a + b * 0x100000000;
else
return b + a * 0x100000000;
}
readInt64(buf, offset) {
if (this.endian === 'le') {
var a = this.readUInt32(buf, offset);
var b = this.readInt32(buf, offset + 4);
return a + b * 0x100000000;
} else {
var a = this.readInt32(buf, offset);
var b = this.readUInt32(buf, offset + 4);
return b + a * 0x100000000;
}
}
readHalf(buf, offset) {
if (this.word === 2)
return this.readInt8(buf, offset);
else if (this.word === 4)
return this.readInt16(buf, offset);
else
return this.readInt32(buf, offset);
}
readUHalf(buf, offset) {
if (this.word === 2)
return this.readUInt8(buf, offset);
else if (this.word === 4)
return this.readUInt16(buf, offset);
else
return this.readUInt32(buf, offset);
}
readWord(buf, offset) {
if (this.word === 1)
return this.readInt8(buf, offset);
else if (this.word === 2)
return this.readInt16(buf, offset);
else if (this.word === 4)
return this.readInt32(buf, offset);
else
return this.readInt64(buf, offset);
}
readUWord(buf, offset) {
if (this.word === 1)
return this.readUInt8(buf, offset);
else if (this.word === 2)
return this.readUInt16(buf, offset);
else if (this.word === 4)
return this.readUInt32(buf, offset);
else
return this.readUInt64(buf, offset);
}
}
// Reader.prototype.setEndian = function setEndian(endian) {
// this.endian = /le|lsb|little/i.test(endian) ? 'le' : 'be';
// };
// Reader.prototype.setWord = function setWord(word) {
// this.word = word;
// };
// Reader.prototype.readUInt8 = function readUInt8(buf, offset) {
// return buf.readUInt8(offset);
// };
// Reader.prototype.readInt8 = function readInt8(buf, offset) {
// return buf.readInt8(offset);
// };
// Reader.prototype.readUInt16 = function readUInt16(buf, offset) {
// if (this.endian === 'le')
// return buf.readUInt16LE(offset);
// else
// return buf.readUInt16BE(offset);
// };
// Reader.prototype.readInt16 = function readInt16(buf, offset) {
// if (this.endian === 'le')
// return buf.readInt16LE(offset);
// else
// return buf.readInt16BE(offset);
// };
// Reader.prototype.readUInt32 = function readUInt32(buf, offset) {
// if (this.endian === 'le')
// return buf.readUInt32LE(offset);
// else
// return buf.readUInt32BE(offset);
// };
// Reader.prototype.readInt32 = function readInt32(buf, offset) {
// if (this.endian === 'le')
// return buf.readInt32LE(offset);
// else
// return buf.readInt32BE(offset);
// };
// Reader.prototype.readUInt64 = function readUInt64(buf, offset) {
// var a = this.readUInt32(buf, offset);
// var b = this.readUInt32(buf, offset + 4);
// if (this.endian === 'le')
// return a + b * 0x100000000;
// else
// return b + a * 0x100000000;
// };
// Reader.prototype.readInt64 = function readInt64(buf, offset) {
// if (this.endian === 'le') {
// var a = this.readUInt32(buf, offset);
// var b = this.readInt32(buf, offset + 4);
// return a + b * 0x100000000;
// } else {
// var a = this.readInt32(buf, offset);
// var b = this.readUInt32(buf, offset + 4);
// return b + a * 0x100000000;
// }
// };
// Reader.prototype.readHalf = function readHalf(buf, offset) {
// if (this.word === 2)
// return this.readInt8(buf, offset);
// else if (this.word === 4)
// return this.readInt16(buf, offset);
// else
// return this.readInt32(buf, offset);
// };
// Reader.prototype.readUHalf = function readUHalf(buf, offset) {
// if (this.word === 2)
// return this.readUInt8(buf, offset);
// else if (this.word === 4)
// return this.readUInt16(buf, offset);
// else
// return this.readUInt32(buf, offset);
// };
// Reader.prototype.readWord = function readWord(buf, offset) {
// if (this.word === 1)
// return this.readInt8(buf, offset);
// else if (this.word === 2)
// return this.readInt16(buf, offset);
// else if (this.word === 4)
// return this.readInt32(buf, offset);
// else
// return this.readInt64(buf, offset);
// };
// Reader.prototype.readUWord = function readUWord(buf, offset) {
// if (this.word === 1)
// return this.readUInt8(buf, offset);
// else if (this.word === 2)
// return this.readUInt16(buf, offset);
// else if (this.word === 4)
// return this.readUInt32(buf, offset);
// else
// return this.readUInt64(buf, offset);
// };

2
helpers/scanner/parsers/macho-node/parser.js
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@ -1,4 +1,4 @@
import Reader from 'endian-reader'
import { Reader } from './endian-reader'
import { constants } from './constants'