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Refactor "try" block in read_cartridge.

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Remove custom exception Read_error in favor of standard Failure.
This commit is contained in:
Fabien Freling 2015-02-24 16:27:41 +01:00
parent 1a978d6814
commit 91ad537af9
1 changed files with 6 additions and 10 deletions
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14
src/cartridge.ml
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@ -3,7 +3,6 @@ open Printf
(** http://bgb.bircd.org/pandocs.htm#thecartridgeheader *)
exception Read_error
type memory_bank_controller =
| ROM_ONLY
@ -41,7 +40,7 @@ let get_ROM_size = function
| 0x52 -> 1100 (* 72 banks *)
| 0x53 -> 1200 (* 80 banks *)
| 0x54 -> 1500 (* 96 banks *)
| _ -> raise Read_error
| _ -> failwith "Invalid ROM size code."
(** RAM size is expressed in KB *)
let get_RAM_size = function
@ -49,7 +48,7 @@ let get_RAM_size = function
| 0x01 -> 2
| 0x02 -> 8
| 0x03 -> 32 (* 4 x 8KB banks *)
| _ -> raise Read_error
| _ -> failwith "Invalid RAM size code."
let read_cartridge file =
@ -62,8 +61,6 @@ let read_cartridge file =
really_input ic full_rom 0 file_size;
close_in ic;
try
(* Nintendo logo *)
let nin_logo_offset = 0x0104 in
let nin_logo_size = 48 in
@ -86,7 +83,6 @@ let read_cartridge file =
Some { full_rom; nintendo_logo; title; rom_size; ram_size }
with
| Invalid_argument(msg) -> None (* This is triggered by Bytes.sub *)
| Read_error -> None
with Sys_error(msg) -> None
| Sys_error msg
| Invalid_argument msg (* This is triggered by Bytes.sub *)
| Failure msg -> prerr_endline msg; None