//--- Class Methods ---
public static bool TryParse(string source, out XDataUri uri)
{
if(string.IsNullOrEmpty(source)) {
uri = null;
return false;
}
// check if source starts with "data:"
if(!source.StartsWithInvariantIgnoreCase(DATA_SCHEME)) {
uri = null;
return false;
}
// check if source contains a comma
var comma = source.IndexOf(",", DATA_SCHEME.Length, StringComparison.Ordinal);
if(comma < 0) {
uri = null;
return false;
}
// parse key-value pairs between scheme and comma
string mime = null;
string charset = null;
var base64 = false;
var temp = source.Substring(DATA_SCHEME.Length, comma - DATA_SCHEME.Length);
foreach(var header in temp.Split(';')) {
var equal = header.IndexOfInvariant("=");
string name;
string value;
if(equal == -1) {
name = string.IsNullOrEmpty(mime) ? "mime" : "base64";
value = XUri.Decode(header).Trim();
} else {
name = XUri.Decode(header.Substring(0, equal)).Trim();
value = XUri.Decode(header.Substring(equal + 1)).Trim();
}
switch(name.ToLowerInvariant()) {
case "mime":
mime = value;
break;
case "charset":
charset = value;
break;
case "base64":
base64 = value.EqualsInvariantIgnoreCase(BASE64_ENCODING);
break;
default:
// NOTE (steveb): we're ignoring additional meta-data since it's not useful for our use case
break;
}
}
// compute mime-type
var mimeType = MimeType.TEXT;
if(!string.IsNullOrEmpty(mime)) {
mimeType = !string.IsNullOrEmpty(charset) ? new MimeType(string.Format("{0};charset={1}", mime, charset)) : new MimeType(mime);
}
// create data uri wrapper
uri = new XDataUri {
MimeType = mimeType,
Base64 = base64
};
return true;
}
//--- Class Methods ---
public static bool TryParse(string source, out XDataUri uri)
{
if (string.IsNullOrEmpty(source))
{
uri = null;
return(false);
}
// check if source starts with "data:"
if (!source.StartsWithInvariantIgnoreCase(DATA_SCHEME))
{
uri = null;
return(false);
}
// check if source contains a comma
var comma = source.IndexOf(",", DATA_SCHEME.Length, StringComparison.Ordinal);
if (comma < 0)
{
uri = null;
return(false);
}
// parse key-value pairs between scheme and comma
string mime = null;
string charset = null;
var base64 = false;
var temp = source.Substring(DATA_SCHEME.Length, comma - DATA_SCHEME.Length);
foreach (var header in temp.Split(';'))
{
var equal = header.IndexOfInvariant("=");
string name;
string value;
if (equal == -1)
{
name = string.IsNullOrEmpty(mime) ? "mime" : "base64";
value = XUri.Decode(header).Trim();
}
else
{
name = XUri.Decode(header.Substring(0, equal)).Trim();
value = XUri.Decode(header.Substring(equal + 1)).Trim();
}
switch (name.ToLowerInvariant())
{
case "mime":
mime = value;
break;
case "charset":
charset = value;
break;
case "base64":
base64 = value.EqualsInvariantIgnoreCase(BASE64_ENCODING);
break;
default:
// NOTE (steveb): we're ignoring additional meta-data since it's not useful for our use case
break;
}
}
// compute mime-type
var mimeType = MimeType.TEXT;
if (!string.IsNullOrEmpty(mime))
{
mimeType = !string.IsNullOrEmpty(charset) ? new MimeType(string.Format("{0};charset={1}", mime, charset)) : new MimeType(mime);
}
// create data uri wrapper
uri = new XDataUri {
MimeType = mimeType,
Base64 = base64
};
return(true);
}