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- /* Copyright (C) 1989, 1992, 1993 Aladdin Enterprises. All rights reserved.
-
- This file is part of Ghostscript.
-
- Ghostscript is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- to anyone for the consequences of using it or for whether it serves any
- particular purpose or works at all, unless he says so in writing. Refer
- to the Ghostscript General Public License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- Ghostscript, but only under the conditions described in the Ghostscript
- General Public License. A copy of this license is supposed to have been
- given to you along with Ghostscript so you can know your rights and
- responsibilities. It should be in a file named COPYING. Among other
- things, the copyright notice and this notice must be preserved on all
- copies. */
-
- /* zgeneric.c */
- /* Array/string/dictionary generic operators for PostScript */
- #include "memory_.h"
- #include "ghost.h"
- #include "errors.h"
- #include "oper.h"
- #include "dict.h"
- #include "estack.h" /* for forall */
- #include "iname.h"
- #include "ivmspace.h"
- #include "packed.h"
- #include "store.h"
-
- /* This file implements copy, get, put, getinterval, putinterval, */
- /* length, and forall, which apply generically to */
- /* arrays, strings, and dictionaries. (Copy also has a special */
- /* meaning for copying the top N elements of the stack.) */
-
- /* See the comment in opdef.h for an invariant which allows */
- /* more efficient implementation of forall. */
-
- /* Imported operators */
- extern int zcopy_dict(P1(os_ptr));
-
- /* Forward references */
- private int zcopy_invalid(P1(os_ptr));
- private int zcopy_integer(P1(os_ptr));
- private int zcopy_interval(P1(os_ptr));
- private int copy_interval(P4(os_ptr, uint, os_ptr, const char *));
-
- /* The type dispatch table for `copy'. */
- /* We export it so that Level 2 can extend it to handle gstates. */
- op_proc_p zcopy_procs[t_next_index];
-
- /* Initialize the generic dispatch table. */
- private void
- zgeneric_init(void)
- { int i;
- for ( i = 0; i < t_next_index; i++ )
- zcopy_procs[i] = zcopy_invalid;
- zcopy_procs[t_integer] = zcopy_integer;
- zcopy_procs[t_array] = zcopy_procs[t_string] = zcopy_interval;
- zcopy_procs[t_dictionary] = zcopy_dict;
- }
-
- /* <various1> <various2> copy <various> */
- /* <obj1> ... <objn> <int> copy <obj1> ... <objn> <obj1> ... <objn> */
- /* Note that this implements copy for arrays and strings, */
- /* but not for dictionaries (see zcopy_dict in zdict.c). */
- int
- zcopy(register os_ptr op)
- { int type = r_type(op);
- if ( type >= t_next_index )
- return_error(e_typecheck);
- return (*zcopy_procs[type])(op);
- }
- /* <other> copy */
- private int
- zcopy_invalid(os_ptr op)
- { return_error(e_typecheck);
- }
- /* <obj1> ... <objn> <int> copy <obj1> ... <objn> <obj1> ... <objn> */
- private int
- zcopy_integer(register os_ptr op)
- { os_ptr op1 = op - 1;
- int count;
- if ( (ulong)op->value.intval > op - osbot )
- return_error(e_rangecheck);
- count = op->value.intval;
- if ( op1 + count > ostop )
- return_error(e_stackoverflow);
- memcpy((char *)op, (char *)(op - count), count * sizeof(ref));
- push(count - 1);
- return 0;
- }
- /* <array1> <array2> copy <subarray2> */
- /* <string1> <string2> copy <substring2> */
- private int
- zcopy_interval(register os_ptr op)
- { os_ptr op1 = op - 1;
- int code = copy_interval(op, 0, op1, "copy");
- if ( code < 0 ) return code;
- r_set_size(op, r_size(op1));
- *op1 = *op;
- pop(1);
- return 0;
- }
-
- /* <array|dict|name|packedarray|string> length <int> */
- int
- zlength(register os_ptr op)
- { switch ( r_type(op) )
- {
- case t_array:
- case t_string:
- case t_mixedarray:
- case t_shortarray:
- check_read(*op);
- make_int(op, r_size(op));
- return 0;
- case t_dictionary:
- check_dict_read(*op);
- make_int(op, dict_length(op));
- return 0;
- case t_name:
- { ref str;
- name_string_ref(op, &str);
- make_int(op, r_size(&str));
- }
- return 0;
- default:
- return_error(e_typecheck);
- }
- }
-
- /* <array|packedarray|string> <index> get <obj> */
- /* <dict> <key> get <obj> */
- int
- zget(register os_ptr op)
- { os_ptr op1 = op - 1;
- ref *pvalue;
- switch ( r_type(op1) )
- {
- case t_dictionary:
- check_dict_read(*op1);
- if ( dict_find(op1, op, &pvalue) <= 0 )
- return_error(e_undefined);
- op[-1] = *pvalue;
- break;
- case t_string:
- check_type(*op, t_integer);
- check_read(*op1);
- if ( (ulong)(op->value.intval) >= r_size(op1) )
- return_error(e_rangecheck);
- make_int(op1, op1->value.bytes[(uint)op->value.intval]);
- break;
- default:
- { int code;
- check_type(*op, t_integer);
- check_read(*op1);
- code = array_get(op1, op->value.intval, op1);
- if ( code < 0 ) return code;
- }
- }
- pop(1);
- return 0;
- }
-
- /* <array> <index> <obj> put - */
- /* <dict> <key> <value> put - */
- /* <string> <index> <int> put - */
- int
- zput(register os_ptr op)
- { os_ptr op1 = op - 1;
- os_ptr op2 = op1 - 1;
- switch ( r_type(op2) )
- {
- case t_dictionary:
- check_dict_write(*op2);
- { int code = dict_put(op2, op1, op);
- if ( code ) return code; /* error */
- }
- break;
- case t_array:
- check_type(*op1, t_integer);
- check_write(*op2);
- if ( (ulong)(op1->value.intval) >= r_size(op2) )
- return_error(e_rangecheck);
- if ( !r_is_global(op) && r_is_global(op2) )
- return_error(e_invalidaccess);
- { ref *eltp = op2->value.refs + (uint)op1->value.intval;
- ref_assign_old(eltp, op, "put");
- } break;
- case t_mixedarray: /* packed arrays are read-only */
- case t_shortarray:
- return_error(e_invalidaccess);
- case t_string:
- check_type(*op1, t_integer);
- check_write(*op2);
- if ( (ulong)(op1->value.intval) >= r_size(op2) )
- return_error(e_rangecheck);
- check_type(*op, t_integer);
- if ( (ulong)op->value.intval > 0xff )
- return_error(e_rangecheck);
- op2->value.bytes[(uint)op1->value.intval] = (byte)op->value.intval;
- break;
- default:
- return_error(e_typecheck);
- }
- pop(3);
- return 0;
- }
-
- /* <seq:array|packedarray|string> <index> <count> getinterval <subseq> */
- int
- zgetinterval(register os_ptr op)
- { os_ptr op1 = op - 1;
- os_ptr op2 = op1 - 1;
- uint index;
- uint count;
- check_type(*op1, t_integer);
- check_type(*op, t_integer);
- switch ( r_type(op2) )
- {
- default:
- return_error(e_typecheck);
- case t_array: case t_string:
- case t_mixedarray:
- case t_shortarray: ;
- }
- check_read(*op2);
- if ( (ulong)op1->value.intval > r_size(op2) )
- return_error(e_rangecheck);
- index = op1->value.intval;
- if ( (ulong)op->value.intval > r_size(op2) - index )
- return_error(e_rangecheck);
- count = op->value.intval;
- switch ( r_type(op2) )
- {
- case t_array: op2->value.refs += index; break;
- case t_string: op2->value.bytes += index; break;
- case t_mixedarray:
- { const ref_packed *packed = op2->value.packed;
- for ( ; index--; ) packed = packed_next(packed);
- op2->value.packed = packed;
- } break;
- case t_shortarray: op2->value.packed += index; break;
- }
- r_set_size(op2, count);
- pop(2);
- return 0;
- }
-
- /* <array1> <index> <array2|packedarray2> putinterval - */
- /* <string1> <index> <string2> putinterval - */
- int
- zputinterval(register os_ptr op)
- { os_ptr opindex = op - 1;
- os_ptr opto = opindex - 1;
- int code;
- check_type(*opindex, t_integer);
- switch ( r_type(opto) )
- {
- default:
- return_error(e_typecheck);
- case t_mixedarray: case t_shortarray:
- return_error(e_invalidaccess);
- case t_array: case t_string: ;
- }
- check_write(*opto);
- if ( (ulong)opindex->value.intval > r_size(opto) )
- return_error(e_rangecheck);
- code = copy_interval(opto, (uint)(opindex->value.intval), op, "putinterval");
- if ( code >= 0 ) pop(3);
- return code;
- }
-
- /* <array|packedarray|string> <<element> proc> forall - */
- /* <dict> <<key> <value> proc> forall - */
- private int
- array_continue(P1(os_ptr)),
- dict_continue(P1(os_ptr)),
- string_continue(P1(os_ptr)),
- packedarray_continue(P1(os_ptr));
- private int forall_cleanup(P1(os_ptr));
- int
- zforall(register os_ptr op)
- { os_ptr obj = op - 1;
- register es_ptr ep = esp;
- uint index = 0; /* only used for dictionaries */
- check_estack(6);
- #define cproc (ep + 5)
- switch ( r_type(obj) )
- {
- default:
- return_error(e_typecheck);
- case t_array:
- check_read(*obj);
- make_op_estack(cproc, array_continue);
- break;
- case t_dictionary:
- check_dict_read(*obj);
- make_op_estack(cproc, dict_continue);
- index = dict_first(obj);
- break;
- case t_string:
- check_read(*obj);
- make_op_estack(cproc, string_continue);
- break;
- case t_mixedarray:
- case t_shortarray:
- check_read(*obj);
- make_op_estack(cproc, packedarray_continue);
- break;
- }
- check_proc(*op);
- /* Push a mark, the composite object, the iteration index, */
- /* and the procedure, and invoke the continuation operator. */
- make_mark_estack(ep + 1, es_for, forall_cleanup);
- ep[2] = *obj;
- make_int(ep + 3, index);
- ep[4] = *op;
- esp += 4;
- pop(2); op -= 2;
- return (*real_opproc(cproc))(op);
- #undef cproc
- }
- /* Continuation operator for arrays */
- private int
- array_continue(register os_ptr op)
- { es_ptr obj = esp - 2;
- if ( r_size(obj) ) /* continue */
- { push(1);
- r_inc_size(obj, -1);
- *op = *obj->value.refs;
- obj->value.refs++;
- esp += 2;
- *esp = obj[2];
- return o_push_estack;
- }
- else /* done */
- { esp -= 4; /* pop mark, object, index, proc */
- return o_pop_estack;
- }
- }
- /* Continuation operator for dictionaries */
- private int
- dict_continue(register os_ptr op)
- { es_ptr obj = esp - 2;
- int index = (int)esp[-1].value.intval;
- push(2); /* make room for key and value */
- if ( (index = dict_next(obj, index, op - 1)) >= 0 ) /* continue */
- { esp[-1].value.intval = index;
- esp += 2;
- *esp = obj[2];
- return o_push_estack;
- }
- else /* done */
- { pop(2); /* undo push */
- esp -= 4; /* pop mark, object, index, proc */
- return o_pop_estack;
- }
- }
- /* Continuation operator for strings */
- private int
- string_continue(register os_ptr op)
- { es_ptr obj = esp - 2;
- if ( r_size(obj) ) /* continue */
- { r_inc_size(obj, -1);
- push(1);
- make_int(op, *obj->value.bytes);
- obj->value.bytes++;
- esp += 2;
- *esp = obj[2];
- return o_push_estack;
- }
- else /* done */
- { esp -= 4; /* pop mark, object, index, proc */
- return o_pop_estack;
- }
- }
- /* Continuation operator for packed arrays */
- private int
- packedarray_continue(register os_ptr op)
- { es_ptr obj = esp - 2;
- if ( r_size(obj) ) /* continue */
- { const ref_packed *packed = obj->value.packed;
- r_inc_size(obj, -1);
- push(1);
- packed_get(packed, op);
- obj->value.packed = packed_next(packed);
- esp += 2;
- *esp = obj[2];
- return o_push_estack;
- }
- else /* done */
- { esp -= 4; /* pop mark, object, index, proc */
- return o_pop_estack;
- }
- }
- /* Vacuous cleanup procedure */
- private int
- forall_cleanup(os_ptr op)
- { return 0;
- }
-
- /* ------ Initialization procedure ------ */
-
- op_def zgeneric_op_defs[] = {
- {"1copy", zcopy},
- {"2forall", zforall},
- {"2get", zget},
- {"3getinterval", zgetinterval},
- {"1length", zlength},
- {"3put", zput},
- {"3putinterval", zputinterval},
- /* Internal operators */
- {"0%array_continue", array_continue},
- {"0%dict_continue", dict_continue},
- {"0%packedarray_continue", packedarray_continue},
- {"0%string_continue", string_continue},
- op_def_end(zgeneric_init)
- };
-
- /* ------ Shared routines ------ */
-
- /* Copy an interval from one operand to another. */
- /* This is used by both putinterval and string/array copy. */
- /* One operand is known to be an array or string, */
- /* and the starting index is known to be less than or equal to */
- /* its length; nothing else has been checked. */
- private int
- copy_interval(os_ptr prto, uint index, os_ptr prfrom, const char *cname)
- { int fromtype = r_type(prfrom);
- uint fromsize = r_size(prfrom);
- if ( !(fromtype == r_type(prto) || (fromtype == t_shortarray
- || fromtype == t_mixedarray) && r_type(prto) == t_array)
- )
- return_error(e_typecheck);
- check_read(*prfrom);
- check_write(*prto);
- if ( fromsize > r_size(prto) - index )
- return_error(e_rangecheck);
- switch ( fromtype )
- {
- case t_array:
- return refcpy_to_old(prto, index, prfrom->value.refs,
- fromsize, cname);
- case t_string:
- memcpy(prto->value.bytes + index, prfrom->value.bytes,
- fromsize);
- break;
- case t_mixedarray:
- case t_shortarray:
- { int i;
- const ref_packed *packed = prfrom->value.packed;
- ref *pdest = prto->value.refs + index;
- ref elt;
- for ( i = 0; i < fromsize; i++, pdest++ )
- { packed_get(packed, &elt);
- ref_assign_old(pdest, &elt, cname);
- packed = packed_next(packed);
- }
- } break;
- }
- return 0;
- }
-