Added file missing file from previous commit

sdk/lib/io/http_headers.dart

Index: sdk/lib/io/http_headers.dart
diff --git a/sdk/lib/io/http_headers.dart b/sdk/lib/io/http_headers.dart
new file mode 100644
index 0000000000000000000000000000000000000000..55a9a8957f87c205664b41fe62363b35bf8e5272
--- /dev/null
+++ b/sdk/lib/io/http_headers.dart
@@ -0,0 +1,628 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+class _HttpHeaders implements HttpHeaders {
+  _HttpHeaders() : _headers = new Map<String, List<String>>();
+
+  List<String> operator[](String name) {
+    name = name.toLowerCase();
+    return _headers[name];
+  }
+
+  String value(String name) {
+    name = name.toLowerCase();
+    List<String> values = _headers[name];
+    if (values == null) return null;
+    if (values.length > 1) {
+      throw new HttpException("More than one value for header $name");
+    }
+    return values[0];
+  }
+
+  void add(String name, Object value) {
+    _checkMutable();
+    if (value is List) {
+      for (int i = 0; i < value.length; i++) {
+        _add(name, value[i]);
+      }
+    } else {
+      _add(name, value);
+    }
+  }
+
+  void set(String name, Object value) {
+    name = name.toLowerCase();
+    _checkMutable();
+    removeAll(name);
+    add(name, value);
+  }
+
+  void remove(String name, Object value) {
+    _checkMutable();
+    name = name.toLowerCase();
+    List<String> values = _headers[name];
+    if (values != null) {
+      int index = values.indexOf(value);
+      if (index != -1) {
+        values.removeRange(index, 1);
+      }
+    }
+  }
+
+  void removeAll(String name) {
+    _checkMutable();
+    name = name.toLowerCase();
+    _headers.remove(name);
+  }
+
+  void forEach(void f(String name, List<String> values)) {
+    _headers.forEach(f);
+  }
+
+  void noFolding(String name) {
+    if (_noFoldingHeaders == null) _noFoldingHeaders = new List<String>();
+    _noFoldingHeaders.add(name);
+  }
+
+  String get host => _host;
+
+  void set host(String host) {
+    _checkMutable();
+    _host = host;
+    _updateHostHeader();
+  }
+
+  int get port => _port;
+
+  void set port(int port) {
+    _checkMutable();
+    _port = port;
+    _updateHostHeader();
+  }
+
+  Date get ifModifiedSince {
+    List<String> values = _headers["if-modified-since"];
+    if (values != null) {
+      try {
+        return _HttpUtils.parseDate(values[0]);
+      } on Exception catch (e) {
+        return null;
+      }
+    }
+    return null;
+  }
+
+  void set ifModifiedSince(Date ifModifiedSince) {
+    _checkMutable();
+    // Format "ifModifiedSince" header with date in Greenwich Mean Time (GMT).
+    String formatted = _HttpUtils.formatDate(ifModifiedSince.toUtc());
+    _set("if-modified-since", formatted);
+  }
+
+  Date get date {
+    List<String> values = _headers["date"];
+    if (values != null) {
+      try {
+        return _HttpUtils.parseDate(values[0]);
+      } on Exception catch (e) {
+        return null;
+      }
+    }
+    return null;
+  }
+
+  void set date(Date date) {
+    _checkMutable();
+    // Format "Date" header with date in Greenwich Mean Time (GMT).
+    String formatted = _HttpUtils.formatDate(date.toUtc());
+    _set("date", formatted);
+  }
+
+  Date get expires {
+    List<String> values = _headers["expires"];
+    if (values != null) {
+      try {
+        return _HttpUtils.parseDate(values[0]);
+      } on Exception catch (e) {
+        return null;
+      }
+    }
+    return null;
+  }
+
+  void set expires(Date expires) {
+    _checkMutable();
+    // Format "Expires" header with date in Greenwich Mean Time (GMT).
+    String formatted = _HttpUtils.formatDate(expires.toUtc());
+    _set("expires", formatted);
+  }
+
+  ContentType get contentType {
+    var values = _headers["content-type"];
+    if (values != null) {
+      return new ContentType.fromString(values[0]);
+    } else {
+      return new ContentType();
+    }
+  }
+
+  void set contentType(ContentType contentType) {
+    _checkMutable();
+    _set("content-type", contentType.toString());
+  }
+
+  void _add(String name, Object value) {
+    var lowerCaseName = name.toLowerCase();
+    // TODO(sgjesse): Add immutable state throw HttpException is immutable.
+    if (lowerCaseName == "date") {
+      if (value is Date) {
+        date = value;
+      } else if (value is String) {
+        _set("date", value);
+      } else {
+        throw new HttpException("Unexpected type for header named $name");
+      }
+    } else if (lowerCaseName == "expires") {
+      if (value is Date) {
+        expires = value;
+      } else if (value is String) {
+        _set("expires", value);
+      } else {
+        throw new HttpException("Unexpected type for header named $name");
+      }
+    } else if (lowerCaseName == "if-modified-since") {
+      if (value is Date) {
+        ifModifiedSince = value;
+      } else if (value is String) {
+        _set("if-modified-since", value);
+      } else {
+        throw new HttpException("Unexpected type for header named $name");
+      }
+    } else if (lowerCaseName == "host") {
+      int pos = value.indexOf(":");
+      if (pos == -1) {
+        _host = value;
+        _port = HttpClient.DEFAULT_HTTP_PORT;
+      } else {
+        if (pos > 0) {
+          _host = value.substring(0, pos);
+        } else {
+          _host = null;
+        }
+        if (pos + 1 == value.length) {
+          _port = HttpClient.DEFAULT_HTTP_PORT;
+        } else {
+          try {
+            _port = parseInt(value.substring(pos + 1));
+          } on FormatException catch (e) {
+            _port = null;
+          }
+        }
+      }
+      _set("host", value);
+    } else if (lowerCaseName == "content-type") {
+      _set("content-type", value);
+    } else {
+      name = lowerCaseName;
+      List<String> values = _headers[name];
+      if (values == null) {
+        values = new List<String>();
+        _headers[name] = values;
+      }
+      if (value is Date) {
+        values.add(_HttpUtils.formatDate(value));
+      } else {
+        values.add(value.toString());
+      }
+    }
+  }
+
+  void _set(String name, String value) {
+    name = name.toLowerCase();
+    List<String> values = new List<String>();
+    _headers[name] = values;
+    values.add(value);
+  }
+
+  _checkMutable() {
+    if (!_mutable) throw new HttpException("HTTP headers are not mutable");
+  }
+
+  _updateHostHeader() {
+    bool defaultPort = _port == null || _port == HttpClient.DEFAULT_HTTP_PORT;
+    String portPart = defaultPort ? "" : ":$_port";
+    _set("host", "$host$portPart");
+  }
+
+  _foldHeader(String name) {
+    if (name == "set-cookie" ||
+        (_noFoldingHeaders != null &&
+         _noFoldingHeaders.indexOf(name) != -1)) {
+      return false;
+    }
+    return true;
+  }
+
+  _write(_HttpConnectionBase connection) {
+    final COLONSP = const [_CharCode.COLON, _CharCode.SP];
+    final COMMASP = const [_CharCode.COMMA, _CharCode.SP];
+    final CRLF = const [_CharCode.CR, _CharCode.LF];
+
+    var bufferSize = 16 * 1024;
+    var buffer = new Uint8List(bufferSize);
+    var bufferPos = 0;
+
+    void writeBuffer() {
+      connection._writeFrom(buffer, 0, bufferPos);
+      bufferPos = 0;
+    }
+
+    // Format headers.
+    _headers.forEach((String name, List<String> values) {
+      bool fold = _foldHeader(name);
+      List<int> nameData;
+      nameData = name.charCodes;
+      int nameDataLen = nameData.length;
+      if (nameDataLen + 2 > bufferSize - bufferPos) writeBuffer();
+      buffer.setRange(bufferPos, nameDataLen, nameData);
+      bufferPos += nameDataLen;
+      buffer[bufferPos++] = _CharCode.COLON;
+      buffer[bufferPos++] = _CharCode.SP;
+      for (int i = 0; i < values.length; i++) {
+        List<int> data = values[i].charCodes;
+        int dataLen = data.length;
+        // Worst case here is writing the name, value and 6 additional bytes.
+        if (nameDataLen + dataLen + 6 > bufferSize - bufferPos) writeBuffer();
+        if (i > 0) {
+          if (fold) {
+            buffer[bufferPos++] = _CharCode.COMMA;
+            buffer[bufferPos++] = _CharCode.SP;
+          } else {
+            buffer[bufferPos++] = _CharCode.CR;
+            buffer[bufferPos++] = _CharCode.LF;
+            buffer.setRange(bufferPos, nameDataLen, nameData);
+            bufferPos += nameDataLen;
+            buffer[bufferPos++] = _CharCode.COLON;
+            buffer[bufferPos++] = _CharCode.SP;
+          }
+        }
+        buffer.setRange(bufferPos, dataLen, data);
+        bufferPos += dataLen;
+      }
+      buffer[bufferPos++] = _CharCode.CR;
+      buffer[bufferPos++] = _CharCode.LF;
+    });
+    writeBuffer();
+  }
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    _headers.forEach((String name, List<String> values) {
+      sb.add(name);
+      sb.add(": ");
+      bool fold = _foldHeader(name);
+      for (int i = 0; i < values.length; i++) {
+        if (i > 0) {
+          if (fold) {
+            sb.add(", ");
+          } else {
+            sb.add("\n");
+            sb.add(name);
+            sb.add(": ");
+          }
+        }
+        sb.add(values[i]);
+      }
+      sb.add("\n");
+    });
+    return sb.toString();
+  }
+
+  bool _mutable = true;  // Are the headers currently mutable?
+  Map<String, List<String>> _headers;
+  List<String> _noFoldingHeaders;
+
+  String _host;
+  int _port;
+}
+
+
+class _HeaderValue implements HeaderValue {
+  _HeaderValue([String this.value = ""]);
+
+  _HeaderValue.fromString(String value, {this.parameterSeparator: ";"}) {
+    // Parse the string.
+    _parse(value);
+  }
+
+  Map<String, String> get parameters {
+    if (_parameters == null) _parameters = new Map<String, String>();
+    return _parameters;
+  }
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.add(value);
+    if (parameters != null && parameters.length > 0) {
+      _parameters.forEach((String name, String value) {
+        sb.add("; ");
+        sb.add(name);
+        sb.add("=");
+        sb.add(value);
+      });
+    }
+    return sb.toString();
+  }
+
+  void _parse(String s) {
+    int index = 0;
+
+    bool done() => index == s.length;
+
+    void skipWS() {
+      while (!done()) {
+        if (s[index] != " " && s[index] != "\t") return;
+        index++;
+      }
+    }
+
+    String parseValue() {
+      int start = index;
+      while (!done()) {
+        if (s[index] == " " ||
+            s[index] == "\t" ||
+            s[index] == parameterSeparator) break;
+        index++;
+      }
+      return s.substring(start, index).toLowerCase();
+    }
+
+    void expect(String expected) {
+      if (done() || s[index] != expected) {
+        throw new HttpException("Failed to parse header value");
+      }
+      index++;
+    }
+
+    void maybeExpect(String expected) {
+      if (s[index] == expected) index++;
+    }
+
+    void parseParameters() {
+      _parameters = new Map<String, String>();
+
+      String parseParameterName() {
+        int start = index;
+        while (!done()) {
+          if (s[index] == " " || s[index] == "\t" || s[index] == "=") break;
+          index++;
+        }
+        return s.substring(start, index).toLowerCase();
+      }
+
+      String parseParameterValue() {
+        if (s[index] == "\"") {
+          // Parse quoted value.
+          StringBuffer sb = new StringBuffer();
+          index++;
+          while (!done()) {
+            if (s[index] == "\\") {
+              if (index + 1 == s.length) {
+                throw new HttpException("Failed to parse header value");
+              }
+              index++;
+            } else if (s[index] == "\"") {
+              index++;
+              break;
+            }
+            sb.add(s[index]);
+            index++;
+          }
+          return sb.toString();
+        } else {
+          // Parse non-quoted value.
+          return parseValue();
+        }
+      }
+
+      while (!done()) {
+        skipWS();
+        if (done()) return;
+        String name = parseParameterName();
+        skipWS();
+        expect("=");
+        skipWS();
+        String value = parseParameterValue();
+        _parameters[name] = value;
+        skipWS();
+        if (done()) return;
+        expect(parameterSeparator);
+      }
+    }
+
+    skipWS();
+    value = parseValue();
+    skipWS();
+    if (done()) return;
+    maybeExpect(parameterSeparator);
+    parseParameters();
+  }
+
+  String value;
+  String parameterSeparator;
+  Map<String, String> _parameters;
+}
+
+
+class _ContentType extends _HeaderValue implements ContentType {
+  _ContentType(String primaryType, String subType)
+      : _primaryType = primaryType, _subType = subType, super("");
+
+  _ContentType.fromString(String value) : super.fromString(value);
+
+  String get value => "$_primaryType/$_subType";
+
+  void set value(String s) {
+    int index = s.indexOf("/");
+    if (index == -1 || index == (s.length - 1)) {
+      primaryType = s.trim().toLowerCase();
+      subType = "";
+    } else {
+      primaryType = s.substring(0, index).trim().toLowerCase();
+      subType = s.substring(index + 1).trim().toLowerCase();
+    }
+  }
+
+  String get primaryType => _primaryType;
+
+  void set primaryType(String s) {
+    _primaryType = s;
+  }
+
+  String get subType => _subType;
+
+  void set subType(String s) {
+    _subType = s;
+  }
+
+  String get charset => parameters["charset"];
+
+  void set charset(String s) {
+    parameters["charset"] = s;
+  }
+
+  String _primaryType = "";
+  String _subType = "";
+}
+
+
+class _Cookie implements Cookie {
+  _Cookie([String this.name, String this.value]);
+
+  _Cookie.fromSetCookieValue(String value) {
+    // Parse the Set-Cookie header value.
+    _parseSetCookieValue(value);
+  }
+
+  // Parse a Set-Cookie header value according to the rules in RFC 6265.
+  void _parseSetCookieValue(String s) {
+    int index = 0;
+
+    bool done() => index == s.length;
+
+    String parseName() {
+      int start = index;
+      while (!done()) {
+        if (s[index] == "=") break;
+        index++;
+      }
+      return s.substring(start, index).trim().toLowerCase();
+    }
+
+    String parseValue() {
+      int start = index;
+      while (!done()) {
+        if (s[index] == ";") break;
+        index++;
+      }
+      return s.substring(start, index).trim().toLowerCase();
+    }
+
+    void expect(String expected) {
+      if (done()) throw new HttpException("Failed to parse header value [$s]");
+      if (s[index] != expected) {
+        throw new HttpException("Failed to parse header value [$s]");
+      }
+      index++;
+    }
+
+    void parseAttributes() {
+      String parseAttributeName() {
+        int start = index;
+        while (!done()) {
+          if (s[index] == "=" || s[index] == ";") break;
+          index++;
+        }
+        return s.substring(start, index).trim().toLowerCase();
+      }
+
+      String parseAttributeValue() {
+        int start = index;
+        while (!done()) {
+          if (s[index] == ";") break;
+          index++;
+        }
+        return s.substring(start, index).trim().toLowerCase();
+      }
+
+      while (!done()) {
+        String name = parseAttributeName();
+        String value = "";
+        if (!done() && s[index] == "=") {
+          index++;  // Skip the = character.
+          value = parseAttributeValue();
+        }
+        if (name == "expires") {
+          expires = _HttpUtils.parseCookieDate(value);
+        } else if (name == "max-age") {
+          maxAge = parseInt(value);
+        } else if (name == "domain") {
+          domain = value;
+        } else if (name == "path") {
+          path = value;
+        } else if (name == "httponly") {
+          httpOnly = true;
+        } else if (name == "secure") {
+          secure = true;
+        }
+        if (!done()) index++;  // Skip the ; character
+      }
+    }
+
+    name = parseName();
+    if (done() || name.length == 0) {
+      throw new HttpException("Failed to parse header value [$s]");
+    }
+    index++;  // Skip the = character.
+    value = parseValue();
+    if (done()) return;
+    index++;  // Skip the ; character.
+    parseAttributes();
+  }
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.add(name);
+    sb.add("=");
+    sb.add(value);
+    if (expires != null) {
+      sb.add("; Expires=");
+      sb.add(_HttpUtils.formatDate(expires));
+    }
+    if (maxAge != null) {
+      sb.add("; Max-Age=");
+      sb.add(maxAge);
+    }
+    if (domain != null) {
+      sb.add("; Domain=");
+      sb.add(domain);
+    }
+    if (path != null) {
+      sb.add("; Path=");
+      sb.add(path);
+    }
+    if (secure) sb.add("; Secure");
+    if (httpOnly) sb.add("; HttpOnly");
+    return sb.toString();
+  }
+
+  String name;
+  String value;
+  Date expires;
+  int maxAge;
+  String domain;
+  String path;
+  bool httpOnly = false;
+  bool secure = false;
+}