isFileValid static method
Validates if file meets minimum size requirements
Platform Support: All
Parameters:
filename
: The filename to check extension fromfileSize
: The actual file size in bytes
Returns: true if file meets minimum size for its type, false otherwise
Implementation
static bool isFileValid(String filename, int fileSize) {
final extension = getExtension(filename);
final minSize = getMinimumSize(extension);
return fileSize >= minSize;
}