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added static class implementing string extension methods.

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methods check if file name ends with specified extensions.
This commit is contained in:
morkt 2017-04-10 22:18:41 +04:00
parent 2fd4d2cf7d
commit a4bd5caf05
1 changed files with 60 additions and 0 deletions
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60
ArcFormats/ArcCommon.cs
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@ -93,6 +93,66 @@ namespace GameRes.Formats
}
}
public static class StringExtensions
{
/// <summary>
/// Check if <paramref name="filename"/> has specified extension <param name="ext"/>.
/// </summary>
public static bool HasExtension (this string filename, string ext)
{
bool ext_is_empty = string.IsNullOrEmpty (ext);
if (!ext_is_empty && '.' == ext[0])
return filename.EndsWith (ext, StringComparison.InvariantCultureIgnoreCase);
int ext_start = GetExtensionIndex (filename);
// filename extension length
int l_ext_length = filename.Length - ext_start;
if (ext_is_empty)
return 0 == l_ext_length;
return (l_ext_length == ext.Length
&& filename.EndsWith (ext, StringComparison.InvariantCultureIgnoreCase));
}
/// <summary>
/// Check if filename ends with any of the extensions from the <paramref name="ext_list"/>.
/// </summary>
public static bool HasAnyOfExtensions (this string filename, params string[] ext_list)
{
int ext_start = GetExtensionIndex (filename);
int l_ext_length = filename.Length - ext_start;
foreach (string ext in ext_list)
{
if (string.IsNullOrEmpty (ext) || "." == ext)
{
if (0 == l_ext_length)
return true;
}
else if ('.' == ext[0] || l_ext_length == ext.Length)
{
if (filename.EndsWith (ext, StringComparison.InvariantCultureIgnoreCase))
return true;
}
}
return false;
}
internal static int GetExtensionIndex (string filename)
{
int name_start = filename.LastIndexOfAny (VFS.PathSeparatorChars);
if (-1 == name_start)
name_start = 0;
else
name_start++;
if (filename.Length == name_start) // path ends with '\'
return name_start;
int ext_start = filename.LastIndexOf ('.', filename.Length-1, filename.Length - name_start);
if (-1 == ext_start)
return filename.Length;
else
return ext_start + 1;
}
}
public class HuffmanDecoder
{
byte[] m_src;