lookupDynamic method
String
lookupDynamic(
- String extension, {
- String defaultMimeType = 'application/octet-stream',
})
Implementation
String lookupDynamic(String extension,
{List<int>? headerBytes,
String defaultMimeType = 'application/octet-stream'}) {
extension = extension.toLowerCase().trim();
var mimeType = lookup(extension, headerBytes: headerBytes);
if (mimeType != null && mimeType.isNotEmpty) {
return mimeType;
}
var fieldNameLength = extension.length;
if (fieldNameLength > 1) {
var f2 = extension.substring(0, fieldNameLength - 1);
mimeType = lookup(f2);
if (mimeType != null && mimeType.isNotEmpty) {
return mimeType;
}
}
if (fieldNameLength > 2) {
var f2 = extension.substring(0, fieldNameLength - 2) +
extension.substring(fieldNameLength - 1);
mimeType = lookup(f2);
if (mimeType != null && mimeType.isNotEmpty) {
return mimeType;
}
}
return defaultMimeType;
}