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- /* Copyright (C) 1989, 1992 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. */
-
- /* dict.h */
- /* Interfaces for Ghostscript dictionary package */
-
- /*
- * Contrary to our usual practice, we expose the (first-level)
- * representation of a dictionary in the interface file,
- * because it is so important that access checking go fast.
- * The access attributes for the dictionary are stored in
- * the contents ref.
- */
- struct dict_s {
- ref count; /* t_integer, # of occupied entries; */
- /* "size" is maxlength as seen by client. */
- ref keys; /* t_shortarray or t_array, keys */
- ref values; /* t_array, values */
- };
-
- /* Define the maximum size of a dictionary. */
- extern const uint dict_max_size;
-
- /* Define whether dictionaries expand automatically when full. */
- /* Note that if dict_auto_expand is true, dict_put, dict_copy, and */
- /* dict_resize cannot return e_dictfull; however, they can return */
- /* e_VMerror. (dict_lookup and dict_find can return e_dictfull */
- /* even if dict_auto_expand is true.) */
- extern int dict_auto_expand;
-
- /* Create a dictionary. */
- extern int dict_create(P2(uint maxlength, ref *pdref));
-
- /* Return a pointer to a ref that holds the access attributes */
- /* for a dictionary. */
- #define dict_access_ref(pdref) (&(pdref)->value.pdict->values)
- #define check_dict_read(dref) check_read(*dict_access_ref(&dref))
- #define check_dict_write(dref) check_write(*dict_access_ref(&dref))
-
- /* Look up in a stack of dictionaries. Store a pointer to the value slot */
- /* where found, or to the (value) slot for inserting. */
- /* Return 1 if found, 0 if not and there is room for a new entry, */
- /* or e_dictfull if the dictionary is full and the key is missing. */
- /* The caller is responsible for ensuring key is not a null. */
- /* Note that pdbot <= pdtop, and the search starts at pdtop. */
- extern int dict_lookup(P4(const ref *pdbot, const ref *pdtop, const ref *key, ref **ppvalue));
- /* Look up in just one dictionary. */
- #define dict_find(dref,key,ppvalue) dict_lookup(dref,dref,key,ppvalue)
-
- /* Enter a key-value pair in a dictionary. */
- /* Return 0, e_dictfull, or e_VMerror if the key was a string */
- /* and a VMerror occurred when converting it to a name. */
- extern int dict_put(P3(ref *pdref, const ref *key, const ref *pvalue));
-
- /* Remove a key-value pair from a dictionary. */
- /* Return 0 or e_undefined. */
- extern int dict_undef(P2(ref *pdref, const ref *key));
-
- /* Return the number of elements in a dictionary. */
- extern uint dict_length(P1(const ref *pdref));
-
- /* Return the capacity of a dictionary. */
- extern uint dict_maxlength(P1(const ref *pdref));
-
- /* Copy one dictionary into another. */
- /* Return 0 or e_dictfull. */
- extern int dict_copy(P2(const ref *dfrom, ref *dto));
-
- /* Grow or shrink a dictionary. */
- /* Return 0, e_dictfull, or e_VMerror. */
- extern int dict_resize(P2(ref *pdref, uint newmaxlength));
-
- /* Prepare to enumerate a dictionary. */
- /* Return an integer suitable for the first call to dict_next. */
- extern int dict_first(P1(const ref *pdref));
-
- /* Enumerate the next element of a dictionary. */
- /* index is initially the result of a call on dict_first. */
- /* Either store a key and value at eltp[0] and eltp[1] */
- /* and return an updated index, or return -1 */
- /* to signal that there are no more elements in the dictionary. */
- extern int dict_next(P3(const ref *pdref, int index, ref *eltp));
-