private static bool CreateDataUri(ParseResult result, out DataUri uri)
{
uri = null;
if (string.IsNullOrEmpty(result.Data))
{
result.SetFailure(ParseFailureKind.Format, UnrecognizedFormat, failureArgumentName: "uriString");
return(false);
}
if (string.IsNullOrEmpty(result.Encoding))
{
uri = new TextDataUri(result.MediaType, result.Parameters, result.Data);
return(true);
}
if (string.Equals(result.Encoding, "base64", StringComparison.CurrentCultureIgnoreCase))
{
try
{
uri = new Base64DataUri(result.MediaType, result.Parameters, Convert.FromBase64String(result.Data));
return(true);
}
catch (FormatException ex)
{
result.SetFailure(ParseFailureKind.FormatWithInnerException, UnrecognizedFormat, failureArgumentName: "uriString", innerException: ex);
return(false);
}
catch (Exception ex)
{
result.SetFailure(ParseFailureKind.NativeException, null, innerException: ex);
return(false);
}
}
result.SetFailure(ParseFailureKind.Format, string.Format("Unrecognized data uri for unknown data encoding: {0}.", result.Encoding), failureArgumentName: "uriString");
return(false);
}
/// <summary>
/// Converts the string representation of a uri to the equivalent data uri.
/// </summary>
/// <param name="uriString">The uri string to parse.</param>
/// <param name="uri">
/// The data uri that will contain the parsed value.
/// If the method returns <c>true</c>, result contains a valid data uri.
/// If the method returns <c>false</c>, result will be <see langword="null"/>. </param>
/// <returns><c>true</c> if the parse operation was successful; otherwise, <c>false</c>.</returns>
public static bool TryParse(string uriString, out DataUri uri)
{
ParseResult result = new ParseResult(false);
if (TryParse(uriString, result) && CreateDataUri(result, out uri))
{
return(true);
}
uri = null;
return(false);
}
/// <summary>
/// Determines if this data uri is equal to another data uri.
/// </summary>
/// <param name="other"><see cref="DataUri"/> to compare with for equality.</param>
/// <returns><c>true</c> if the data uris are equal. <c>false</c> if the data uris are not equal.</returns>
protected override bool Equals(DataUri other)
{
if (!base.Equals(other))
{
return(false);
}
var uri = other as TextDataUri;
if (uri == null)
{
return(false);
}
return(Content == uri.Content);
}
/// <summary>
/// Determines if this data uri is equal to another data uri.
/// </summary>
/// <param name="other"><see cref="DataUri"/> to compare with for equality.</param>
/// <returns><c>true</c> if the data uris are equal. <c>false</c> if the data uris are not equal.</returns>
protected override bool Equals(DataUri other)
{
if (!base.Equals(other))
{
return(false);
}
var uri = other as Base64DataUri;
if (uri == null)
{
return(false);
}
return(Content.SequenceEqual(uri.Content));
}
/// <summary>
/// Determines if this data uri is equal to another data uri.
/// </summary>
/// <param name="other"><see cref="DataUri"/> to compare with for equality.</param>
/// <returns><c>true</c> if the data uris are equal. <c>false</c> if the data uris are not equal.</returns>
protected virtual bool Equals(DataUri other)
{
if (!string.Equals(other.MediaType, MediaType, StringComparison.CurrentCultureIgnoreCase) || Parameters.Count != other.Parameters.Count)
{
return(false);
}
foreach (string parameterName in Parameters)
{
if (Parameters[parameterName] != other.Parameters[parameterName])
{
return(false);
}
}
return(true);
}
