diff options
Diffstat (limited to 'Master/tlpkg/tlgs/lib/type1enc.ps')
-rw-r--r--[-rwxr-xr-x] | Master/tlpkg/tlgs/lib/type1enc.ps | 130 |
1 files changed, 65 insertions, 65 deletions
diff --git a/Master/tlpkg/tlgs/lib/type1enc.ps b/Master/tlpkg/tlgs/lib/type1enc.ps index 8022f08374e..44b54cb335c 100755..100644 --- a/Master/tlpkg/tlgs/lib/type1enc.ps +++ b/Master/tlpkg/tlgs/lib/type1enc.ps @@ -1,65 +1,65 @@ -% Copyright (C) 1992, 1993 Aladdin Enterprises. All rights reserved.
-%
-% This software is provided AS-IS with no warranty, either express or
-% implied.
-%
-% This software is distributed under license and may not be copied,
-% modified or distributed except as expressly authorized under the terms
-% of the license contained in the file LICENSE in this distribution.
-%
-% For more information about licensing, please refer to
-% http://www.ghostscript.com/licensing/. For information on
-% commercial licensing, go to http://www.artifex.com/licensing/ or
-% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
-% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
-
-% $Id: type1enc.ps 6300 2005-12-28 19:56:24Z giles $
-% type1enc.ps
-% PostScript language versions of the Type 1 encryption/decryption algorithms.
-
-% This file is normally not needed with Ghostscript, since Ghostscript
-% implements these algorithms in C. For the specifications, see Chapter 7 of
-% "Adobe Type 1 Font Format," ISBN 0-201-57044-0, published by Addison-Wesley.
-
-/.type1crypt % <R> <from> <to> <proc> .type1crypt <R'> <to>
- % (auxiliary procedure)
- { 4 1 roll
- 0 2 index length getinterval
- 0 1 2 index length 1 sub
- { % Stack: proc R from to index
- 2 index 1 index get % proc R from to index C/P
- 4 index -8 bitshift xor 3 copy put % proc R from to index P/C
- 5 index exec % proc R from to C
-
-% Compute R' = ((R + C) * 52845 + 22719) mod 65536
-% without exceeding a 31-bit integer magnitude, given that
-% 0 <= R <= 65535 and 0 <= C <= 255.
-
- 4 -1 roll add
- dup 20077 mul % 52845 - 32768
- exch 1 and 15 bitshift add % only care about 16 low-order bits
- 22719 add 65535 and 3 1 roll
- }
- for exch pop 3 -1 roll pop
- } bind def
-
-% <state> <fromString> <toString> .type1encrypt <newState> <toSubstring>
-% Encrypts fromString according to the algorithm for Adobe
-% Type 1 fonts, writing the result into toString.
-% toString must be at least as long as fromString or a
-% rangecheck error occurs. state is the initial state of
-% the encryption algorithm (a 16-bit non-negative
-% integer); newState is the new state of the algorithm.
-
-/.type1encrypt
- { { exch pop } .type1crypt
- } bind def
-
-% <state> <fromString> <toString> .type1decrypt <newState> <toSubstring>
-% Decrypts fromString according to the algorithm for Adobe
-% Type 1 fonts, writing the result into toString. Other
-% specifications are as for type1encrypt.
-
-/.type1decrypt
- { { pop 2 index exch get } .type1crypt
- } bind def
+% Copyright (C) 1992, 1993 Aladdin Enterprises. All rights reserved. +% +% This software is provided AS-IS with no warranty, either express or +% implied. +% +% This software is distributed under license and may not be copied, +% modified or distributed except as expressly authorized under the terms +% of the license contained in the file LICENSE in this distribution. +% +% For more information about licensing, please refer to +% http://www.ghostscript.com/licensing/. For information on +% commercial licensing, go to http://www.artifex.com/licensing/ or +% contact Artifex Software, Inc., 101 Lucas Valley Road #110, +% San Rafael, CA 94903, U.S.A., +1(415)492-9861. + +% $Id: type1enc.ps 6300 2005-12-28 19:56:24Z giles $ +% type1enc.ps +% PostScript language versions of the Type 1 encryption/decryption algorithms. + +% This file is normally not needed with Ghostscript, since Ghostscript +% implements these algorithms in C. For the specifications, see Chapter 7 of +% "Adobe Type 1 Font Format," ISBN 0-201-57044-0, published by Addison-Wesley. + +/.type1crypt % <R> <from> <to> <proc> .type1crypt <R'> <to> + % (auxiliary procedure) + { 4 1 roll + 0 2 index length getinterval + 0 1 2 index length 1 sub + { % Stack: proc R from to index + 2 index 1 index get % proc R from to index C/P + 4 index -8 bitshift xor 3 copy put % proc R from to index P/C + 5 index exec % proc R from to C + +% Compute R' = ((R + C) * 52845 + 22719) mod 65536 +% without exceeding a 31-bit integer magnitude, given that +% 0 <= R <= 65535 and 0 <= C <= 255. + + 4 -1 roll add + dup 20077 mul % 52845 - 32768 + exch 1 and 15 bitshift add % only care about 16 low-order bits + 22719 add 65535 and 3 1 roll + } + for exch pop 3 -1 roll pop + } bind def + +% <state> <fromString> <toString> .type1encrypt <newState> <toSubstring> +% Encrypts fromString according to the algorithm for Adobe +% Type 1 fonts, writing the result into toString. +% toString must be at least as long as fromString or a +% rangecheck error occurs. state is the initial state of +% the encryption algorithm (a 16-bit non-negative +% integer); newState is the new state of the algorithm. + +/.type1encrypt + { { exch pop } .type1crypt + } bind def + +% <state> <fromString> <toString> .type1decrypt <newState> <toSubstring> +% Decrypts fromString according to the algorithm for Adobe +% Type 1 fonts, writing the result into toString. Other +% specifications are as for type1encrypt. + +/.type1decrypt + { { pop 2 index exch get } .type1crypt + } bind def |