diff options
Diffstat (limited to 'node_modules/asn1/lib/ber/reader.js')
| -rw-r--r-- | node_modules/asn1/lib/ber/reader.js | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/node_modules/asn1/lib/ber/reader.js b/node_modules/asn1/lib/ber/reader.js deleted file mode 100644 index 8a7e4ca..0000000 --- a/node_modules/asn1/lib/ber/reader.js +++ /dev/null @@ -1,262 +0,0 @@ -// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved. - -var assert = require('assert'); -var Buffer = require('safer-buffer').Buffer; - -var ASN1 = require('./types'); -var errors = require('./errors'); - - -// --- Globals - -var newInvalidAsn1Error = errors.newInvalidAsn1Error; - - - -// --- API - -function Reader(data) { - if (!data || !Buffer.isBuffer(data)) - throw new TypeError('data must be a node Buffer'); - - this._buf = data; - this._size = data.length; - - // These hold the "current" state - this._len = 0; - this._offset = 0; -} - -Object.defineProperty(Reader.prototype, 'length', { - enumerable: true, - get: function () { return (this._len); } -}); - -Object.defineProperty(Reader.prototype, 'offset', { - enumerable: true, - get: function () { return (this._offset); } -}); - -Object.defineProperty(Reader.prototype, 'remain', { - get: function () { return (this._size - this._offset); } -}); - -Object.defineProperty(Reader.prototype, 'buffer', { - get: function () { return (this._buf.slice(this._offset)); } -}); - - -/** - * Reads a single byte and advances offset; you can pass in `true` to make this - * a "peek" operation (i.e., get the byte, but don't advance the offset). - * - * @param {Boolean} peek true means don't move offset. - * @return {Number} the next byte, null if not enough data. - */ -Reader.prototype.readByte = function (peek) { - if (this._size - this._offset < 1) - return null; - - var b = this._buf[this._offset] & 0xff; - - if (!peek) - this._offset += 1; - - return b; -}; - - -Reader.prototype.peek = function () { - return this.readByte(true); -}; - - -/** - * Reads a (potentially) variable length off the BER buffer. This call is - * not really meant to be called directly, as callers have to manipulate - * the internal buffer afterwards. - * - * As a result of this call, you can call `Reader.length`, until the - * next thing called that does a readLength. - * - * @return {Number} the amount of offset to advance the buffer. - * @throws {InvalidAsn1Error} on bad ASN.1 - */ -Reader.prototype.readLength = function (offset) { - if (offset === undefined) - offset = this._offset; - - if (offset >= this._size) - return null; - - var lenB = this._buf[offset++] & 0xff; - if (lenB === null) - return null; - - if ((lenB & 0x80) === 0x80) { - lenB &= 0x7f; - - if (lenB === 0) - throw newInvalidAsn1Error('Indefinite length not supported'); - - if (lenB > 4) - throw newInvalidAsn1Error('encoding too long'); - - if (this._size - offset < lenB) - return null; - - this._len = 0; - for (var i = 0; i < lenB; i++) - this._len = (this._len << 8) + (this._buf[offset++] & 0xff); - - } else { - // Wasn't a variable length - this._len = lenB; - } - - return offset; -}; - - -/** - * Parses the next sequence in this BER buffer. - * - * To get the length of the sequence, call `Reader.length`. - * - * @return {Number} the sequence's tag. - */ -Reader.prototype.readSequence = function (tag) { - var seq = this.peek(); - if (seq === null) - return null; - if (tag !== undefined && tag !== seq) - throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) + - ': got 0x' + seq.toString(16)); - - var o = this.readLength(this._offset + 1); // stored in `length` - if (o === null) - return null; - - this._offset = o; - return seq; -}; - - -Reader.prototype.readInt = function () { - return this._readTag(ASN1.Integer); -}; - - -Reader.prototype.readBoolean = function () { - return (this._readTag(ASN1.Boolean) === 0 ? false : true); -}; - - -Reader.prototype.readEnumeration = function () { - return this._readTag(ASN1.Enumeration); -}; - - -Reader.prototype.readString = function (tag, retbuf) { - if (!tag) - tag = ASN1.OctetString; - - var b = this.peek(); - if (b === null) - return null; - - if (b !== tag) - throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) + - ': got 0x' + b.toString(16)); - - var o = this.readLength(this._offset + 1); // stored in `length` - - if (o === null) - return null; - - if (this.length > this._size - o) - return null; - - this._offset = o; - - if (this.length === 0) - return retbuf ? Buffer.alloc(0) : ''; - - var str = this._buf.slice(this._offset, this._offset + this.length); - this._offset += this.length; - - return retbuf ? str : str.toString('utf8'); -}; - -Reader.prototype.readOID = function (tag) { - if (!tag) - tag = ASN1.OID; - - var b = this.readString(tag, true); - if (b === null) - return null; - - var values = []; - var value = 0; - - for (var i = 0; i < b.length; i++) { - var byte = b[i] & 0xff; - - value <<= 7; - value += byte & 0x7f; - if ((byte & 0x80) === 0) { - values.push(value); - value = 0; - } - } - - value = values.shift(); - values.unshift(value % 40); - values.unshift((value / 40) >> 0); - - return values.join('.'); -}; - - -Reader.prototype._readTag = function (tag) { - assert.ok(tag !== undefined); - - var b = this.peek(); - - if (b === null) - return null; - - if (b !== tag) - throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) + - ': got 0x' + b.toString(16)); - - var o = this.readLength(this._offset + 1); // stored in `length` - if (o === null) - return null; - - if (this.length > 4) - throw newInvalidAsn1Error('Integer too long: ' + this.length); - - if (this.length > this._size - o) - return null; - this._offset = o; - - var fb = this._buf[this._offset]; - var value = 0; - - for (var i = 0; i < this.length; i++) { - value <<= 8; - value |= (this._buf[this._offset++] & 0xff); - } - - if ((fb & 0x80) === 0x80 && i !== 4) - value -= (1 << (i * 8)); - - return value >> 0; -}; - - - -// --- Exported API - -module.exports = Reader; |