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/**
* The permissions of a newly created file.
*/
class FilePermissions {
/**
* The permissions for the file's owning user.
*/
val userPerms: Permissions
/**
* The permissions for the file's owning group.
*/
val groupPerms: Permissions
/**
* The permissions for everyone else.
*/
val elsePerms: Permissions
/**
* Is the file a directory? If not, it's a regular file.
*/
val isDirectory: Boolean
enum class Permissions(val bits: UByte) {
READ(0x4u),
WRITE(0x2u),
EXECUTE(0x1u),
READ_WRITE(READ.bits.or(WRITE.bits)),
READ_EXECUTE(READ.bits.or(EXECUTE.bits)),
WRITE_EXECUTE(WRITE.bits.or(EXECUTE.bits)),
READ_WRITE_EXECUTE(READ.bits.or(WRITE.bits.or(EXECUTE.bits)))
}
/**
* Constructor for file permissions with separate fields.
*
* @param userPerms The permissions for the file's owning user.
* @param groupPerms The permissions for the file's owning group.
* @param elsePerms The permissions for everyone else.
* @param isDirectory Is the file a directory? If not, it's a regular file.
*/
constructor(userPerms: Permissions, groupPerms: Permissions, elsePerms: Permissions, isDirectory: Boolean) {
this.userPerms = userPerms
this.groupPerms = groupPerms
this.elsePerms = elsePerms
this.isDirectory = isDirectory
}
/**
* Turn the permissions described by the [FilePermissions] fields into a permission integer (4 bytes).
*/
fun toPermissionInt(): UInt {
val permFileds = listOf(userPerms, groupPerms, elsePerms)
val perms: UInt = 0u
for (i in 0..permFileds.size) {
perms.or(permFileds[i].bits.toUInt().shl(8 * (permFileds.size - 1 - i)))
}
if (isDirectory) {
perms.or(0x80000000u)
}
return perms
}
}
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