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// Copyright (C) 2004-2021 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.
#include "mupdf/fitz.h"
#include "mupdf/pdf.h"
#include <string.h>
static void pdf_drop_obj_as_void(fz_context *ctx, void *obj)
{
pdf_drop_obj(ctx, obj);
}
/* We do need to come up with an effective way to see what is already in the
* file to avoid adding to what is already there. This is avoided for pdfwrite
* as we check as we add each font. For adding text to an existing file though
* it may be more problematic. */
pdf_obj *
pdf_find_font_resource(fz_context *ctx, pdf_document *doc, int type, int encoding, fz_font *item, pdf_font_resource_key *key)
{
pdf_obj *res;
if (!doc->resources.fonts)
doc->resources.fonts = fz_new_hash_table(ctx, 4096, sizeof(*key), -1, pdf_drop_obj_as_void);
memset(key, 0, sizeof(*key));
fz_font_digest(ctx, item, key->digest);
key->type = type;
key->encoding = encoding;
key->local_xref = doc->local_xref_nesting > 0;
res = fz_hash_find(ctx, doc->resources.fonts, (void *)key);
if (res)
pdf_keep_obj(ctx, res);
return res;
}
pdf_obj *
pdf_insert_font_resource(fz_context *ctx, pdf_document *doc, pdf_font_resource_key *key, pdf_obj *obj)
{
pdf_obj *res = fz_hash_insert(ctx, doc->resources.fonts, (void *)key, obj);
if (res)
fz_warn(ctx, "warning: font resource already present");
else
res = pdf_keep_obj(ctx, obj);
return pdf_keep_obj(ctx, res);
}
static int purge_local_font_resource(fz_context *ctx, void *state, void *key_, int keylen, void *val)
{
pdf_font_resource_key *key = key_;
if (key->local_xref)
{
pdf_drop_obj(ctx, val);
return 1;
}
return 0;
}
void
pdf_purge_local_font_resources(fz_context *ctx, pdf_document *doc)
{
if (doc->resources.fonts)
fz_hash_filter(ctx, doc->resources.fonts, NULL, purge_local_font_resource);
}
void
pdf_drop_resource_tables(fz_context *ctx, pdf_document *doc)
{
if (doc)
{
fz_drop_hash_table(ctx, doc->resources.fonts);
}
}
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