1 line
18 KiB
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1 line
18 KiB
JSON
{"ast":null,"code":"// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.\nvar assert = require('assert');\n\nvar Buffer = require('safer-buffer').Buffer;\n\nvar ASN1 = require('./types');\n\nvar errors = require('./errors'); // --- Globals\n\n\nvar newInvalidAsn1Error = errors.newInvalidAsn1Error; // --- API\n\nfunction Reader(data) {\n if (!data || !Buffer.isBuffer(data)) throw new TypeError('data must be a node Buffer');\n this._buf = data;\n this._size = data.length; // These hold the \"current\" state\n\n this._len = 0;\n this._offset = 0;\n}\n\nObject.defineProperty(Reader.prototype, 'length', {\n enumerable: true,\n get: function () {\n return this._len;\n }\n});\nObject.defineProperty(Reader.prototype, 'offset', {\n enumerable: true,\n get: function () {\n return this._offset;\n }\n});\nObject.defineProperty(Reader.prototype, 'remain', {\n get: function () {\n return this._size - this._offset;\n }\n});\nObject.defineProperty(Reader.prototype, 'buffer', {\n get: function () {\n return this._buf.slice(this._offset);\n }\n});\n/**\n * Reads a single byte and advances offset; you can pass in `true` to make this\n * a \"peek\" operation (i.e., get the byte, but don't advance the offset).\n *\n * @param {Boolean} peek true means don't move offset.\n * @return {Number} the next byte, null if not enough data.\n */\n\nReader.prototype.readByte = function (peek) {\n if (this._size - this._offset < 1) return null;\n var b = this._buf[this._offset] & 0xff;\n if (!peek) this._offset += 1;\n return b;\n};\n\nReader.prototype.peek = function () {\n return this.readByte(true);\n};\n/**\n * Reads a (potentially) variable length off the BER buffer. 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() { return (this._buf.slice(this._offset)); }\n});\n\n\n/**\n * Reads a single byte and advances offset; you can pass in `true` to make this\n * a \"peek\" operation (i.e., get the byte, but don't advance the offset).\n *\n * @param {Boolean} peek true means don't move offset.\n * @return {Number} the next byte, null if not enough data.\n */\nReader.prototype.readByte = function (peek) {\n if (this._size - this._offset < 1)\n return null;\n\n var b = this._buf[this._offset] & 0xff;\n\n if (!peek)\n this._offset += 1;\n\n return b;\n};\n\n\nReader.prototype.peek = function () {\n return this.readByte(true);\n};\n\n\n/**\n * Reads a (potentially) variable length off the BER buffer. This call is\n * not really meant to be called directly, as callers have to manipulate\n * the internal buffer afterwards.\n *\n * As a result of this call, you can call `Reader.length`, until the\n * next thing called that does a readLength.\n *\n * @return {Number} the amount of offset to advance the buffer.\n * @throws {InvalidAsn1Error} on bad ASN.1\n */\nReader.prototype.readLength = function (offset) {\n if (offset === undefined)\n offset = this._offset;\n\n if (offset >= this._size)\n return null;\n\n var lenB = this._buf[offset++] & 0xff;\n if (lenB === null)\n return null;\n\n if ((lenB & 0x80) === 0x80) {\n lenB &= 0x7f;\n\n if (lenB === 0)\n throw newInvalidAsn1Error('Indefinite length not supported');\n\n if (lenB > 4)\n throw newInvalidAsn1Error('encoding too long');\n\n if (this._size - offset < lenB)\n return null;\n\n this._len = 0;\n for (var i = 0; i < lenB; i++)\n this._len = (this._len << 8) + (this._buf[offset++] & 0xff);\n\n } else {\n // Wasn't a variable length\n this._len = lenB;\n }\n\n return offset;\n};\n\n\n/**\n * Parses the next sequence in this BER buffer.\n *\n * To get the length of the sequence, call `Reader.length`.\n *\n * @return {Number} the sequence's tag.\n */\nReader.prototype.readSequence = function (tag) {\n var seq = this.peek();\n if (seq === null)\n return null;\n if (tag !== undefined && tag !== seq)\n throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) +\n ': got 0x' + seq.toString(16));\n\n var o = this.readLength(this._offset + 1); // stored in `length`\n if (o === null)\n return null;\n\n this._offset = o;\n return seq;\n};\n\n\nReader.prototype.readInt = function () {\n return this._readTag(ASN1.Integer);\n};\n\n\nReader.prototype.readBoolean = function () {\n return (this._readTag(ASN1.Boolean) === 0 ? false : true);\n};\n\n\nReader.prototype.readEnumeration = function () {\n return this._readTag(ASN1.Enumeration);\n};\n\n\nReader.prototype.readString = function (tag, retbuf) {\n if (!tag)\n tag = ASN1.OctetString;\n\n var b = this.peek();\n if (b === null)\n return null;\n\n if (b !== tag)\n throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) +\n ': got 0x' + b.toString(16));\n\n var o = this.readLength(this._offset + 1); // stored in `length`\n\n if (o === null)\n return null;\n\n if (this.length > this._size - o)\n return null;\n\n this._offset = o;\n\n if (this.length === 0)\n return retbuf ? Buffer.alloc(0) : '';\n\n var str = this._buf.slice(this._offset, this._offset + this.length);\n this._offset += this.length;\n\n return retbuf ? str : str.toString('utf8');\n};\n\nReader.prototype.readOID = function (tag) {\n if (!tag)\n tag = ASN1.OID;\n\n var b = this.readString(tag, true);\n if (b === null)\n return null;\n\n var values = [];\n var value = 0;\n\n for (var i = 0; i < b.length; i++) {\n var byte = b[i] & 0xff;\n\n value <<= 7;\n value += byte & 0x7f;\n if ((byte & 0x80) === 0) {\n values.push(value);\n value = 0;\n }\n }\n\n value = values.shift();\n values.unshift(value % 40);\n values.unshift((value / 40) >> 0);\n\n return values.join('.');\n};\n\n\nReader.prototype._readTag = function (tag) {\n assert.ok(tag !== undefined);\n\n var b = this.peek();\n\n if (b === null)\n return null;\n\n if (b !== tag)\n throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) +\n ': got 0x' + b.toString(16));\n\n var o = this.readLength(this._offset + 1); // stored in `length`\n if (o === null)\n return null;\n\n if (this.length > 4)\n throw newInvalidAsn1Error('Integer too long: ' + this.length);\n\n if (this.length > this._size - o)\n return null;\n this._offset = o;\n\n var fb = this._buf[this._offset];\n var value = 0;\n\n for (var i = 0; i < this.length; i++) {\n value <<= 8;\n value |= (this._buf[this._offset++] & 0xff);\n }\n\n if ((fb & 0x80) === 0x80 && i !== 4)\n value -= (1 << (i * 8));\n\n return value >> 0;\n};\n\n\n\n// --- Exported API\n\nmodule.exports = Reader;\n"]},"metadata":{},"sourceType":"script"} |