386BSD 0.1 development

[unix-history] / usr / othersrc / public / ghostscript-2.4.1 / zgeneric.c

/* Copyright (C) 1989, 1992 Aladdin Enterprises.  All rights reserved.
   Distributed by Free Software Foundation, Inc.

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 "name.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.) */

/* Imported operators */
extern int zcopy_device(P1(os_ptr));
extern int zcopy_dict(P1(os_ptr));

/* Forward references */
int array_get(P3(ref *, long, ref *));
private int copy_interval(P4(os_ptr, uint, os_ptr, const char *));

/* copy */
/* Note that this implements copy for arrays and strings, */
/* but not for dictionaries (see zcopy_dict in zdict.c) */
/* or devices (see zcopy_device in zdevice.c). */
int
zcopy(register os_ptr op)
{	os_ptr op1 = op - 1;
	int code;
	switch ( r_type(op) )
	   {
	case t_integer:
	   {	int count;
		if ( (ulong)op->value.intval > op - osbot )
			return e_rangecheck;
		count = op->value.intval;
		if ( op1 + count > ostop )
			return e_stackoverflow;
		memcpy((char *)op, (char *)(op - count), count * sizeof(ref));
		push(count - 1);
		return 0;
	   }
	case t_array:
	case t_string:
		code = copy_interval(op, 0, op1, "copy");
		break;
	case t_device:
		return zcopy_device(op);
	case t_dictionary:
		return zcopy_dict(op);
	default:
		return e_typecheck;
	   }
	if ( code ) return code;	/* error */
	r_set_size(op, r_size(op1));
	*op1 = *op;
	pop(1);
	return 0;
}

/* length */
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 e_typecheck;
	   }
}

/* get */
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 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) ) {
printf("Zget t_string %u >= %u\n", (ulong)(op->value.intval), r_size(op1) );
			return e_rangecheck;
		}
	   {	int element = op1->value.bytes[(uint)op->value.intval];
		make_int(op1, element);
	   }
		pop(1);
		return 0;
	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;
}

/* 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 e_rangecheck;
		ref_assign_old(op2->value.refs + (uint)op1->value.intval, op, "put");
		break;
	case t_mixedarray:		/* packed arrays are read-only */
	case t_shortarray:
		return e_invalidaccess;
	case t_string:
		check_type(*op1, t_integer);
		check_write(*op2);
		if ( (ulong)(op1->value.intval) >= r_size(op2) )
			return e_rangecheck;
		check_type(*op, t_integer);
		if ( (ulong)op->value.intval > 0xff )
			return e_rangecheck;
		op2->value.bytes[(uint)op1->value.intval] = (byte)op->value.intval;
		break;
	default:
		return e_typecheck;
	   }
	pop(3);
	return 0;
}

/* getinterval */
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 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 e_rangecheck;
	index = op1->value.intval;
	if ( (ulong)op->value.intval > r_size(op2) - index ) return 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:
	   {	ushort *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;
}

/* 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 e_typecheck;
	case t_mixedarray: case t_shortarray: return e_invalidaccess;
	case t_array: case t_string: ;
	   }
	check_write(*opto);
	if ( (ulong)opindex->value.intval > r_size(opto) )
		return e_rangecheck;
	code = copy_interval(opto, (uint)(opindex->value.intval), op, "putinterval");
	if ( code >= 0 ) pop(3);
	return code;
}

/* forall */
private int
  array_continue(P1(os_ptr)),
  i_array_continue,
  dict_continue(P1(os_ptr)),
  i_dict_continue,
  string_continue(P1(os_ptr)),
  i_string_continue,
  packedarray_continue(P1(os_ptr)),
  i_packedarray_continue;
int
zforall(register os_ptr op)
{	int (*cproc)(P1(os_ptr));
	os_ptr obj = op - 1;
	uint index = 0;			/* only used for dictionaries */
	switch ( r_type(obj) )
	   {
	default:
		return e_typecheck;
	case t_array:
		check_read(*obj);
		cproc = array_continue;
		break;
	case t_dictionary:
		check_dict_read(*obj);
		cproc = dict_continue;
		index = dict_first(obj);
		break;
	case t_string:
		check_read(*obj);
		cproc = string_continue;
		break;
	case t_mixedarray:
	case t_shortarray:
		check_read(*obj);
		cproc = packedarray_continue;
		break;
	   }
	check_proc(*op);
	/* Push a mark, the composite object, the iteration index, */
	/* and the procedure, and invoke the continuation operator. */
	check_estack(6);
	mark_estack(es_for);
	*++esp = *obj;
	++esp;
	make_int(esp, index);
	*++esp = *op;
	pop(2);  op -= 2;
	return (*cproc)(op);
}
/* Continuation operator for arrays */
private int
array_continue(register os_ptr op)
{	es_ptr obj = esp - 2;
	if ( r_size(obj) )		/* continue */
	   {	r_inc_size(obj, -1);
		push(1);
		*op = *obj->value.refs;
		obj->value.refs++;
		push_op_estack(array_continue, i_array_continue);	/* push continuation */
		*++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;
		push_op_estack(dict_continue, i_dict_continue);	/* push continuation */
		*++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++;
		push_op_estack(string_continue, i_string_continue);	/* push continuation */
		*++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 */
	   {	ushort *packed = obj->value.packed;
		r_inc_size(obj, -1);
		push(1);
		packed_get(packed, op);
		obj->value.packed = packed_next(packed);
		push_op_estack(packedarray_continue, i_packedarray_continue);	/* push continuation */
		*++esp = obj[2];
		return o_push_estack;
	   }
	else				/* done */
	   {	esp -= 4;		/* pop mark, object, index, proc */
		return o_pop_estack;
	   }
}

/* ------ 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, &i_array_continue},
	{"0%dict_continue", dict_continue, &i_dict_continue},
	{"0%packedarray_continue", packedarray_continue, &i_packedarray_continue},
	{"0%string_continue", string_continue, &i_string_continue},
	op_def_end(0)
};

/* ------ Shared routines ------ */

/* Get an element from an array of some kind. */
/* This is also used to index into Encoding vectors, */
/* the error name vector, etc. */
int
array_get(ref *aref, long index_long, ref *pref)
{	uint index = (uint)index_long;
	if ( (ulong)index_long >= r_size(aref) )
		return e_rangecheck;
	switch ( r_type(aref) )
	   {
	case t_array:
	   {	ref *pvalue = aref->value.refs + index;
		ref_assign(pref, pvalue);
	   }	return 0;
	case t_mixedarray:
	   {	ushort *packed = aref->value.packed;
		for ( ; index--; ) packed = packed_next(packed);
		packed_get(packed, pref);
	   }	return 0;
	case t_shortarray:
	   {	ushort *packed = aref->value.packed + index;
		packed_get(packed, pref);
	   }	return 0;
	default:
		return e_typecheck;
	   }
}

/* 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 e_typecheck;
	check_read(*prfrom);
	check_write(*prto);
	if ( fromsize > r_size(prto) - index ) return e_rangecheck;
	switch ( fromtype )
	   {
	case t_array:
		refcpy_to_old(prto->value.refs + index, prfrom->value.refs,
			       fromsize, cname);
		break;
	case t_string:
		memcpy(prto->value.bytes + index, prfrom->value.bytes,
		       fromsize);
		break;
	case t_mixedarray:
	case t_shortarray:
	   {	int i;
		ushort *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;
}