635 lines
19 KiB
C#
635 lines
19 KiB
C#
//------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------
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namespace System.Runtime
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{
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using System.Collections;
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using System.Collections.Specialized;
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using System.Runtime.Serialization;
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using System.Text;
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//copied from System.Web.HttpUtility code (renamed here) to remove dependency on System.Web.dll
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static class UrlUtility
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{
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// Query string parsing support
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public static NameValueCollection ParseQueryString(string query)
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{
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return ParseQueryString(query, Encoding.UTF8);
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}
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public static NameValueCollection ParseQueryString(string query, Encoding encoding)
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{
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if (query == null)
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{
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throw Fx.Exception.ArgumentNull("query");
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}
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if (encoding == null)
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{
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throw Fx.Exception.ArgumentNull("encoding");
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}
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if (query.Length > 0 && query[0] == '?')
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{
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query = query.Substring(1);
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}
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return new HttpValueCollection(query, encoding);
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}
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public static string UrlEncode(string str)
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{
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if (str == null)
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{
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return null;
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}
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return UrlEncode(str, Encoding.UTF8);
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}
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// URL encodes a path portion of a URL string and returns the encoded string.
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public static string UrlPathEncode(string str)
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{
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if (str == null)
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{
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return null;
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}
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// recurse in case there is a query string
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int i = str.IndexOf('?');
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if (i >= 0)
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{
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return UrlPathEncode(str.Substring(0, i)) + str.Substring(i);
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}
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// encode DBCS characters and spaces only
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return UrlEncodeSpaces(UrlEncodeNonAscii(str, Encoding.UTF8));
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}
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public static string UrlEncode(string str, Encoding encoding)
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{
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if (str == null)
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{
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return null;
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}
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return Encoding.ASCII.GetString(UrlEncodeToBytes(str, encoding));
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}
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public static string UrlEncodeUnicode(string str)
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{
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if (str == null)
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return null;
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return UrlEncodeUnicodeStringToStringInternal(str, false);
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}
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private static string UrlEncodeUnicodeStringToStringInternal(string s, bool ignoreAscii)
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{
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int l = s.Length;
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StringBuilder sb = new StringBuilder(l);
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for (int i = 0; i < l; i++)
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{
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char ch = s[i];
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if ((ch & 0xff80) == 0)
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{ // 7 bit?
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if (ignoreAscii || IsSafe(ch))
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{
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sb.Append(ch);
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}
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else if (ch == ' ')
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{
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sb.Append('+');
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}
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else
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{
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sb.Append('%');
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sb.Append(IntToHex((ch >> 4) & 0xf));
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sb.Append(IntToHex((ch) & 0xf));
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}
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}
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else
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{ // arbitrary Unicode?
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sb.Append("%u");
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sb.Append(IntToHex((ch >> 12) & 0xf));
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sb.Append(IntToHex((ch >> 8) & 0xf));
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sb.Append(IntToHex((ch >> 4) & 0xf));
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sb.Append(IntToHex((ch) & 0xf));
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}
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}
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return sb.ToString();
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}
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// Helper to encode the non-ASCII url characters only
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static string UrlEncodeNonAscii(string str, Encoding e)
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{
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if (string.IsNullOrEmpty(str))
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{
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return str;
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}
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if (e == null)
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{
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e = Encoding.UTF8;
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}
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byte[] bytes = e.GetBytes(str);
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bytes = UrlEncodeBytesToBytesInternalNonAscii(bytes, 0, bytes.Length, false);
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return Encoding.ASCII.GetString(bytes);
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}
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// Helper to encode spaces only
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static string UrlEncodeSpaces(string str)
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{
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if (str != null && str.IndexOf(' ') >= 0)
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{
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str = str.Replace(" ", "%20");
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}
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return str;
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}
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public static byte[] UrlEncodeToBytes(string str, Encoding e)
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{
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if (str == null)
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{
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return null;
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}
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byte[] bytes = e.GetBytes(str);
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return UrlEncodeBytesToBytesInternal(bytes, 0, bytes.Length, false);
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}
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//public static string UrlDecode(string str)
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//{
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// if (str == null)
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// return null;
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// return UrlDecode(str, Encoding.UTF8);
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//}
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public static string UrlDecode(string str, Encoding e)
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{
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if (str == null)
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{
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return null;
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}
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return UrlDecodeStringFromStringInternal(str, e);
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}
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// Implementation for encoding
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static byte[] UrlEncodeBytesToBytesInternal(byte[] bytes, int offset, int count, bool alwaysCreateReturnValue)
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{
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int cSpaces = 0;
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int cUnsafe = 0;
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// count them first
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for (int i = 0; i < count; i++)
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{
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char ch = (char)bytes[offset + i];
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if (ch == ' ')
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{
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cSpaces++;
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}
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else if (!IsSafe(ch))
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{
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cUnsafe++;
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}
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}
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// nothing to expand?
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if (!alwaysCreateReturnValue && cSpaces == 0 && cUnsafe == 0)
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{
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return bytes;
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}
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// expand not 'safe' characters into %XX, spaces to +s
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byte[] expandedBytes = new byte[count + cUnsafe * 2];
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int pos = 0;
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for (int i = 0; i < count; i++)
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{
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byte b = bytes[offset + i];
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char ch = (char)b;
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if (IsSafe(ch))
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{
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expandedBytes[pos++] = b;
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}
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else if (ch == ' ')
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{
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expandedBytes[pos++] = (byte)'+';
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}
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else
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{
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expandedBytes[pos++] = (byte)'%';
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expandedBytes[pos++] = (byte)IntToHex((b >> 4) & 0xf);
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expandedBytes[pos++] = (byte)IntToHex(b & 0x0f);
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}
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}
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return expandedBytes;
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}
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static bool IsNonAsciiByte(byte b)
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{
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return (b >= 0x7F || b < 0x20);
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}
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static byte[] UrlEncodeBytesToBytesInternalNonAscii(byte[] bytes, int offset, int count, bool alwaysCreateReturnValue)
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{
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int cNonAscii = 0;
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// count them first
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for (int i = 0; i < count; i++)
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{
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if (IsNonAsciiByte(bytes[offset + i]))
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{
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cNonAscii++;
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}
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}
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// nothing to expand?
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if (!alwaysCreateReturnValue && cNonAscii == 0)
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{
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return bytes;
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}
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// expand not 'safe' characters into %XX, spaces to +s
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byte[] expandedBytes = new byte[count + cNonAscii * 2];
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int pos = 0;
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for (int i = 0; i < count; i++)
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{
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byte b = bytes[offset + i];
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if (IsNonAsciiByte(b))
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{
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expandedBytes[pos++] = (byte)'%';
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expandedBytes[pos++] = (byte)IntToHex((b >> 4) & 0xf);
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expandedBytes[pos++] = (byte)IntToHex(b & 0x0f);
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}
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else
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{
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expandedBytes[pos++] = b;
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}
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}
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return expandedBytes;
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}
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static string UrlDecodeStringFromStringInternal(string s, Encoding e)
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{
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int count = s.Length;
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UrlDecoder helper = new UrlDecoder(count, e);
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// go through the string's chars collapsing %XX and %uXXXX and
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// appending each char as char, with exception of %XX constructs
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// that are appended as bytes
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for (int pos = 0; pos < count; pos++)
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{
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char ch = s[pos];
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if (ch == '+')
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{
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ch = ' ';
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}
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else if (ch == '%' && pos < count - 2)
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{
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if (s[pos + 1] == 'u' && pos < count - 5)
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{
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int h1 = HexToInt(s[pos + 2]);
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int h2 = HexToInt(s[pos + 3]);
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int h3 = HexToInt(s[pos + 4]);
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int h4 = HexToInt(s[pos + 5]);
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if (h1 >= 0 && h2 >= 0 && h3 >= 0 && h4 >= 0)
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{ // valid 4 hex chars
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ch = (char)((h1 << 12) | (h2 << 8) | (h3 << 4) | h4);
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pos += 5;
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// only add as char
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helper.AddChar(ch);
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continue;
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}
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}
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else
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{
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int h1 = HexToInt(s[pos + 1]);
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int h2 = HexToInt(s[pos + 2]);
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if (h1 >= 0 && h2 >= 0)
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{ // valid 2 hex chars
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byte b = (byte)((h1 << 4) | h2);
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pos += 2;
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// don't add as char
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helper.AddByte(b);
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continue;
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}
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}
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}
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if ((ch & 0xFF80) == 0)
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{
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helper.AddByte((byte)ch); // 7 bit have to go as bytes because of Unicode
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}
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else
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{
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helper.AddChar(ch);
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}
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}
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return helper.GetString();
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}
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// Private helpers for URL encoding/decoding
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static int HexToInt(char h)
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{
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return (h >= '0' && h <= '9') ? h - '0' :
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(h >= 'a' && h <= 'f') ? h - 'a' + 10 :
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(h >= 'A' && h <= 'F') ? h - 'A' + 10 :
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-1;
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}
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static char IntToHex(int n)
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{
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//WCF CHANGE: CHANGED FROM Debug.Assert() to Fx.Assert()
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Fx.Assert(n < 0x10, "n < 0x10");
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if (n <= 9)
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{
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return (char)(n + (int)'0');
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}
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else
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{
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return (char)(n - 10 + (int)'a');
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}
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}
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// Set of safe chars, from RFC 1738.4 minus '+'
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internal static bool IsSafe(char ch)
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{
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if (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z' || ch >= '0' && ch <= '9')
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{
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return true;
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}
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switch (ch)
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{
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case '-':
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case '_':
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case '.':
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case '!':
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case '*':
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case '\'':
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case '(':
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case ')':
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return true;
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}
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return false;
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}
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// Internal class to facilitate URL decoding -- keeps char buffer and byte buffer, allows appending of either chars or bytes
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class UrlDecoder
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{
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int _bufferSize;
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// Accumulate characters in a special array
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int _numChars;
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char[] _charBuffer;
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// Accumulate bytes for decoding into characters in a special array
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int _numBytes;
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byte[] _byteBuffer;
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// Encoding to convert chars to bytes
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Encoding _encoding;
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void FlushBytes()
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{
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if (_numBytes > 0)
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{
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_numChars += _encoding.GetChars(_byteBuffer, 0, _numBytes, _charBuffer, _numChars);
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_numBytes = 0;
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}
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}
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internal UrlDecoder(int bufferSize, Encoding encoding)
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{
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_bufferSize = bufferSize;
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_encoding = encoding;
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_charBuffer = new char[bufferSize];
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// byte buffer created on demand
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}
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internal void AddChar(char ch)
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{
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if (_numBytes > 0)
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{
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FlushBytes();
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}
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_charBuffer[_numChars++] = ch;
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}
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internal void AddByte(byte b)
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{
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// if there are no pending bytes treat 7 bit bytes as characters
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// this optimization is temp disable as it doesn't work for some encodings
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//if (_numBytes == 0 && ((b & 0x80) == 0)) {
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// AddChar((char)b);
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//}
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//else
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{
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if (_byteBuffer == null)
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{
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_byteBuffer = new byte[_bufferSize];
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}
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_byteBuffer[_numBytes++] = b;
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}
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}
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internal string GetString()
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{
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if (_numBytes > 0)
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{
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FlushBytes();
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}
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if (_numChars > 0)
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{
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return new String(_charBuffer, 0, _numChars);
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}
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else
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{
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return string.Empty;
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}
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}
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}
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[Serializable]
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class HttpValueCollection : NameValueCollection
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{
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internal HttpValueCollection(string str, Encoding encoding)
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: base(StringComparer.OrdinalIgnoreCase)
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{
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if (!string.IsNullOrEmpty(str))
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{
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FillFromString(str, true, encoding);
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}
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IsReadOnly = false;
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}
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protected HttpValueCollection(SerializationInfo info, StreamingContext context)
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: base(info, context)
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{
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}
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internal void FillFromString(string s, bool urlencoded, Encoding encoding)
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{
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int l = (s != null) ? s.Length : 0;
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int i = 0;
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while (i < l)
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{
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// find next & while noting first = on the way (and if there are more)
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int si = i;
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int ti = -1;
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while (i < l)
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{
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char ch = s[i];
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if (ch == '=')
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{
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if (ti < 0)
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ti = i;
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}
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else if (ch == '&')
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{
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break;
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}
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i++;
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}
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// extract the name / value pair
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string name = null;
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string value = null;
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if (ti >= 0)
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{
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name = s.Substring(si, ti - si);
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value = s.Substring(ti + 1, i - ti - 1);
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}
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else
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{
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value = s.Substring(si, i - si);
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}
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// add name / value pair to the collection
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if (urlencoded)
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{
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base.Add(
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UrlUtility.UrlDecode(name, encoding),
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UrlUtility.UrlDecode(value, encoding));
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}
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else
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{
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base.Add(name, value);
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}
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// trailing '&'
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if (i == l - 1 && s[i] == '&')
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{
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base.Add(null, string.Empty);
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}
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i++;
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}
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}
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public override string ToString()
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{
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return ToString(true, null);
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}
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string ToString(bool urlencoded, IDictionary excludeKeys)
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{
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int n = Count;
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if (n == 0)
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return string.Empty;
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StringBuilder s = new StringBuilder();
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string key, keyPrefix, item;
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for (int i = 0; i < n; i++)
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{
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key = GetKey(i);
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if (excludeKeys != null && key != null && excludeKeys[key] != null)
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{
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continue;
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}
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if (urlencoded)
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{
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key = UrlUtility.UrlEncodeUnicode(key);
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}
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keyPrefix = (!string.IsNullOrEmpty(key)) ? (key + "=") : string.Empty;
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ArrayList values = (ArrayList)BaseGet(i);
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int numValues = (values != null) ? values.Count : 0;
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if (s.Length > 0)
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{
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s.Append('&');
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}
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if (numValues == 1)
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{
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s.Append(keyPrefix);
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item = (string)values[0];
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if (urlencoded)
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item = UrlUtility.UrlEncodeUnicode(item);
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s.Append(item);
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}
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else if (numValues == 0)
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{
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s.Append(keyPrefix);
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}
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else
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{
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for (int j = 0; j < numValues; j++)
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{
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if (j > 0)
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{
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s.Append('&');
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}
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s.Append(keyPrefix);
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item = (string)values[j];
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if (urlencoded)
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{
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item = UrlUtility.UrlEncodeUnicode(item);
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}
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s.Append(item);
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}
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}
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}
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return s.ToString();
|
|
}
|
|
}
|
|
}
|
|
}
|