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- /* Copyright (C) 1994 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* zmisc1.c */
- /* Miscellaneous Type 1 font operators */
- #include "memory_.h"
- #include "ghost.h"
- #include "errors.h"
- #include "oper.h"
- #include "gscrypt1.h"
- #include "strimpl.h"
- #include "sfilter.h"
- #include "ifilter.h"
-
- /* <state> <from_string> <to_string> .type1encrypt <new_state> <substring> */
- /* <state> <from_string> <to_string> .type1decrypt <new_state> <substring> */
- private int type1crypt(P2(os_ptr,
- int (*)(P4(byte *, const byte *, uint, ushort *))));
- int
- ztype1encrypt(os_ptr op)
- { return type1crypt(op, gs_type1_encrypt);
- }
- int
- ztype1decrypt(os_ptr op)
- { return type1crypt(op, gs_type1_decrypt);
- }
- private int
- type1crypt(register os_ptr op, int (*proc)(P4(byte *, const byte *, uint, ushort *)))
- { crypt_state state;
- uint ssize;
- check_type(op[-2], t_integer);
- state = op[-2].value.intval;
- if ( op[-2].value.intval != state )
- return_error(e_rangecheck); /* state value was truncated */
- check_read_type(op[-1], t_string);
- check_write_type(*op, t_string);
- ssize = r_size(op - 1);
- if ( r_size(op) < ssize )
- return_error(e_rangecheck);
- (void) (*proc)(op->value.bytes, op[-1].value.const_bytes, ssize,
- &state); /* can't fail */
- op[-2].value.intval = state;
- op[-1] = *op;
- r_set_size(op - 1, ssize);
- pop(1);
- return 0;
- }
-
- /* <target> <seed> .filter_eexecEncode <file> */
- int
- zexE(register os_ptr op)
- { stream_exE_state state;
- check_type(*op, t_integer);
- state.cstate = op->value.intval;
- if ( op->value.intval != state.cstate )
- return_error(e_rangecheck); /* state value was truncated */
- return filter_write(op, 1, &s_exE_template, (stream_state *)&state, false);
- }
-
- /* <source> <seed> .filter_eexecDecode <file> */
- int
- zexD(register os_ptr op)
- { stream_exD_state state;
- check_type(*op, t_integer);
- state.cstate = op->value.intval;
- if ( op->value.intval != state.cstate )
- return_error(e_rangecheck); /* state value was truncated */
- return filter_read(op, 1, &s_exD_template, (stream_state *)&state, false);
- }
-
- /* ------ Initialization procedure ------ */
-
- op_def zmisc1_op_defs[] = {
- {"2.filter_eexecEncode", zexE},
- {"2.filter_eexecDecode", zexD},
- {"3.type1encrypt", ztype1encrypt},
- {"3.type1decrypt", ztype1decrypt},
- op_def_end(0)
- };
-