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(***********************************************************************)
(* *)
(* Active-DVI *)
(* *)
(* Projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 2002 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Lesser General Public License. *)
(* *)
(* Jun Furuse, Didier Rmy and Pierre Weis. *)
(* Contributions by Roberto Di Cosmo, Didier Le Botlan, *)
(* Xavier Leroy, and Alan Schmitt. *)
(* *)
(* Based on Mldvi by Alexandre Miquel. *)
(***********************************************************************)
(* $Id: input.ml,v 1.4 2003/11/24 12:10:07 furuse Exp $ *)
exception Error of string ;;
(*** Low-level routines for reading integers ***)
let input_uint8 = input_byte ;;
let input_int8 ch =
let n = input_byte ch in
if n < 0x80 then n else n - 0x100 ;;
let input_uint16 ch =
let n0 = input_byte ch in
let n1 = input_byte ch in
(n0 lsl 8) + n1 ;;
let input_int16 ch =
let n0 = input_byte ch in
let n1 = input_byte ch in
let n = (n0 lsl 8) + n1 in
if n < 0x8000 then n else n - 0x10000 ;;
let input_uint24 ch =
let n0 = input_byte ch in
let n1 = input_byte ch in
let n2 = input_byte ch in
(n0 lsl 16) + (n1 lsl 8) + n2 ;;
let input_int24 ch =
let n0 = input_byte ch in
let n1 = input_byte ch in
let n2 = input_byte ch in
let n = (n0 lsl 16) + (n1 lsl 8) + n2 in
if n < 0x800000 then n else n - 0x1000000 ;;
let arch64_input_int32 =
let v_0x80000000 = 0x8 lsl (4*7)
and v_0x100000000 = 0x1 lsl (4*8)
in
fun ch ->
let n0 = input_byte ch in
let n1 = input_byte ch in
let n2 = input_byte ch in
let n3 = input_byte ch in
let n = (n0 lsl 24) + (n1 lsl 16) + (n2 lsl 8) + n3 in
if n < v_0x80000000 then n else n - v_0x100000000 ;;
let arch32_input_int32 ch =
let n0 = input_byte ch in
let n1 = input_byte ch in
let n2 = input_byte ch in
let n3 = input_byte ch in
(* checking if this 32-bit integer
fits into a 31-bit Caml integer *)
match n0 lsr 6 with
| 0|3 -> (n0 lsl 24) + (n1 lsl 16) + (n2 lsl 8) + n3
| 1|2 -> raise (Error "input_uint32: too large 32-bit integer")
| _ -> assert false ;;
let input_int32 =
match Sys.word_size with
| 32 -> arch32_input_int32
| 64 -> arch64_input_int32
| size ->
failwith
(Printf.sprintf "Pkfont: cannot work on a %d-bit architecture" size) ;;
let input_string ch n =
let str = String.create n in
really_input ch str 0 n ;
str ;;
let skip_bytes ch n =
seek_in ch (pos_in ch + n) ;;
|
