1 files changed, 261 insertions, 0 deletions
diff --git a/node.d/node_modules/ber/reader.js b/node.d/node_modules/ber/reader.js
new file mode 100644
index 000000000..0a00e98e3
--- /dev/null
+++ b/node.d/node_modules/ber/reader.js
@@ -0,0 +1,261 @@
+// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.
+
+var assert = require('assert');
+
+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 ? new Buffer(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;