private byte[] UrlEncode(byte[] bytes, int offset, int count)
{
if (!ValidateUrlEncodingParameters(bytes, offset, count))
{
return(null);
}
var cSpaces = 0;
var cUnsafe = 0;
// count them first
for (var i = 0; i < count; i++)
{
var ch = (char)bytes[offset + i];
if (ch == ' ')
{
cSpaces++;
}
else if (!HttpEncoderUtility.IsUrlSafeChar(ch))
{
cUnsafe++;
}
}
// nothing to expand?
if (cSpaces == 0 && cUnsafe == 0)
{
return(bytes);
}
// expand not 'safe' characters into %XX, spaces to +s
var expandedBytes = new byte[count + cUnsafe * 2];
var pos = 0;
for (var i = 0; i < count; i++)
{
var b = bytes[offset + i];
var ch = (char)b;
if (HttpEncoderUtility.IsUrlSafeChar(ch))
{
expandedBytes[pos++] = b;
}
else if (ch == ' ')
{
expandedBytes[pos++] = (byte)'+';
}
else
{
expandedBytes[pos++] = (byte)'%';
expandedBytes[pos++] = (byte)HttpEncoderUtility.IntToHex((b >> 4) & 0xf);
expandedBytes[pos++] = (byte)HttpEncoderUtility.IntToHex(b & 0x0f);
}
}
return(expandedBytes);
}
internal string UrlEncodeUnicode(string value, bool ignoreAscii)
{
if (value == null)
{
return(null);
}
var l = value.Length;
var sb = new StringBuilder(l);
for (var i = 0; i < l; i++)
{
var ch = value[i];
if ((ch & 0xff80) == 0)
{
// 7 bit?
if (ignoreAscii || HttpEncoderUtility.IsUrlSafeChar(ch))
{
sb.Append(ch);
}
else if (ch == ' ')
{
sb.Append('+');
}
else
{
sb.Append('%');
sb.Append(HttpEncoderUtility.IntToHex((ch >> 4) & 0xf));
sb.Append(HttpEncoderUtility.IntToHex(ch & 0xf));
}
}
else
{
// arbitrary Unicode?
sb.Append("%u");
sb.Append(HttpEncoderUtility.IntToHex((ch >> 12) & 0xf));
sb.Append(HttpEncoderUtility.IntToHex((ch >> 8) & 0xf));
sb.Append(HttpEncoderUtility.IntToHex((ch >> 4) & 0xf));
sb.Append(HttpEncoderUtility.IntToHex(ch & 0xf));
}
}
return(sb.ToString());
}
internal static byte[] UrlEncode(byte[] bytes, int offset, int count)
{
if (!ValidateUrlEncodingParameters(bytes, offset, count))
{
return(null);
}
int cSpaces = 0;
int cUnsafe = 0;
// count them first
for (int i = 0; i < count; i++)
{
char ch = (char)bytes[offset + i];
if (ch == ' ')
{
cSpaces++;
}
else if (!HttpEncoderUtility.IsUrlSafeChar(ch))
{
cUnsafe++;
}
}
// nothing to expand?
if (cSpaces == 0 && cUnsafe == 0)
{
// DevDiv 912606: respect "offset" and "count"
if (0 == offset && bytes.Length == count)
{
return(bytes);
}
else
{
var subarray = new byte[count];
Buffer.BlockCopy(bytes, offset, subarray, 0, count);
return(subarray);
}
}
// expand not 'safe' characters into %XX, spaces to +s
byte[] expandedBytes = new byte[count + cUnsafe * 2];
int pos = 0;
for (int i = 0; i < count; i++)
{
byte b = bytes[offset + i];
char ch = (char)b;
if (HttpEncoderUtility.IsUrlSafeChar(ch))
{
expandedBytes[pos++] = b;
}
else if (ch == ' ')
{
expandedBytes[pos++] = (byte)'+';
}
else
{
expandedBytes[pos++] = (byte)'%';
expandedBytes[pos++] = (byte)HttpEncoderUtility.IntToHex((b >> 4) & 0xf);
expandedBytes[pos++] = (byte)HttpEncoderUtility.IntToHex(b & 0x0f);
}
}
return(expandedBytes);
}