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- /* Copyright (C) 1994, 1997, 1999 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL 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 Free Public License (the
- "License") for full details.
-
- Every copy of AFPL 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 AFPL 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.
- */
-
- /*$Id: zmisc1.c,v 1.3 2000/09/19 19:00:54 lpd Exp $ */
- /* Miscellaneous Type 1 font operators */
- #include "memory_.h"
- #include "ghost.h"
- #include "oper.h"
- #include "gscrypt1.h"
- #include "stream.h" /* for getting state of PFBD stream */
- #include "strimpl.h"
- #include "sfilter.h"
- #include "idict.h"
- #include "idparam.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(i_ctx_t *,
- int (*)(P4(byte *, const byte *, uint, ushort *))));
- private int
- ztype1encrypt(i_ctx_t *i_ctx_p)
- {
- return type1crypt(i_ctx_p, gs_type1_encrypt);
- }
- private int
- ztype1decrypt(i_ctx_t *i_ctx_p)
- {
- return type1crypt(i_ctx_p, gs_type1_decrypt);
- }
- private int
- type1crypt(i_ctx_t *i_ctx_p,
- int (*proc)(P4(byte *, const byte *, uint, ushort *)))
- {
- os_ptr op = osp;
- 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);
- discard((*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;
- }
-
- /* Get the seed parameter for eexecEncode/Decode. */
- /* Return npop if OK. */
- private int
- eexec_param(os_ptr op, ushort * pcstate)
- {
- int npop = 1;
-
- if (r_has_type(op, t_dictionary))
- ++npop, --op;
- check_type(*op, t_integer);
- *pcstate = op->value.intval;
- if (op->value.intval != *pcstate)
- return_error(e_rangecheck); /* state value was truncated */
- return npop;
- }
-
- /* <target> <seed> eexecEncode/filter <file> */
- /* <target> <seed> <dict_ignored> eexecEncode/filter <file> */
- private int
- zexE(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- stream_exE_state state;
- int code = eexec_param(op, &state.cstate);
-
- if (code < 0)
- return code;
- return filter_write(i_ctx_p, code, &s_exE_template, (stream_state *)&state, 0);
- }
-
- /* <source> <seed> eexecDecode/filter <file> */
- /* <source> <dict> eexecDecode/filter <file> */
- private int
- zexD(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- stream_exD_state state;
- int code;
-
- (*s_exD_template.set_defaults)((stream_state *)&state);
- if (r_has_type(op, t_dictionary)) {
- uint cstate;
-
- check_dict_read(*op);
- if ((code = dict_uint_param(op, "seed", 0, 0xffff, 0x10000,
- &cstate)) < 0 ||
- (code = dict_int_param(op, "lenIV", 0, max_int, 4,
- &state.lenIV)) < 0
- )
- return code;
- state.cstate = cstate;
- code = 1;
- } else {
- code = eexec_param(op, &state.cstate);
- }
- if (code < 0)
- return code;
- /*
- * If we're reading a .PFB file, let the filter know about it,
- * so it can read recklessly to the end of the binary section.
- */
- if (r_has_type(op - 1, t_file)) {
- stream *s = (op - 1)->value.pfile;
-
- if (s->state != 0 && s->state->template == &s_PFBD_template) {
- stream_PFBD_state *pss = (stream_PFBD_state *)s->state;
-
- state.pfb_state = pss;
- /*
- * If we're reading the binary section of a PFB stream,
- * avoid the conversion from binary to hex and back again.
- */
- if (pss->record_type == 2) {
- /*
- * The PFB decoder may have converted some data to hex
- * already. Convert it back if necessary.
- */
- if (pss->binary_to_hex && sbufavailable(s) > 0) {
- state.binary = 0; /* start as hex */
- state.hex_left = sbufavailable(s);
- } else {
- state.binary = 1;
- }
- pss->binary_to_hex = 0;
- }
- state.record_left = pss->record_left;
- }
- }
- return filter_read(i_ctx_p, code, &s_exD_template, (stream_state *)&state, 0);
- }
-
- /* ------ Initialization procedure ------ */
-
- const op_def zmisc1_op_defs[] =
- {
- {"3.type1encrypt", ztype1encrypt},
- {"3.type1decrypt", ztype1decrypt},
- op_def_begin_filter(),
- {"2eexecEncode", zexE},
- {"2eexecDecode", zexD},
- op_def_end(0)
- };
-