TYPO3 Core

Currently, the handling of file-name casing is improperly defined: The database will usually be case-insensitive (for MySQL this is the default), but we cannot be sure if the filesystem supports case-sensitivity. This leads to a multitude of problems, as the edge-cases are not considered in the code.

We first have to check if we want to support case-sensitivity at all. If not,

1. case-sensitive file systems have to be taken care of in the driver (which might require quite some work for all comparisons etc.) and
2. we have to make sure the database is always case-insensitive.

If we want to support case-sensitivity,

1. the file system might still not support it, so we have to cope with that (i.e., check if a file with the same name, but different casing exists before adding a file)
2. the database always has to be case-sensitive (or we have to store SHA1/MD5 hashes of name and identifier and compare against these)

Oracle and PostgreSQL seem to have case-sensitivity as the default, while MySQL is case-insensitive by default (for sensitivity the collation of the column has to be changed to utf8_bin).