Coverage Report

Created: 2025-01-28 06:17

/src/mupdf/source/pdf/pdf-resources.c
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// Copyright (C) 2004-2021 Artifex Software, Inc.
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//
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// This file is part of MuPDF.
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//
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// MuPDF is free software: you can redistribute it and/or modify it under the
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// terms of the GNU Affero General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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// details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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//
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// Alternative licensing terms are available from the licensor.
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// For commercial licensing, see <https://www.artifex.com/> or contact
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// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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// CA 94129, USA, for further information.
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#include "mupdf/fitz.h"
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#include "mupdf/pdf.h"
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#include <string.h>
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static void pdf_drop_obj_as_void(fz_context *ctx, void *obj)
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3.65k
{
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3.65k
  pdf_drop_obj(ctx, obj);
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3.65k
}
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/* We do need to come up with an effective way to see what is already in the
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 * file to avoid adding to what is already there. This is avoided for pdfwrite
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 * as we check as we add each font. For adding text to an existing file though
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 * it may be more problematic. */
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pdf_obj *
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pdf_find_font_resource(fz_context *ctx, pdf_document *doc, int type, int encoding, fz_font *item, pdf_font_resource_key *key)
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7.41k
{
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7.41k
  pdf_obj *res;
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  if (!doc->resources.fonts)
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570
    doc->resources.fonts = fz_new_hash_table(ctx, 4096, sizeof(*key), -1, pdf_drop_obj_as_void);
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7.41k
  memset(key, 0, sizeof(*key));
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  fz_font_digest(ctx, item, key->digest);
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7.41k
  key->type = type;
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7.41k
  key->encoding = encoding;
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7.41k
  key->local_xref = doc->local_xref_nesting > 0;
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  res = fz_hash_find(ctx, doc->resources.fonts, (void *)key);
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7.41k
  if (res)
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3.76k
    pdf_keep_obj(ctx, res);
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7.41k
  return res;
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}
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pdf_obj *
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pdf_find_colorspace_resource(fz_context *ctx, pdf_document *doc, fz_colorspace *item, pdf_colorspace_resource_key *key)
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{
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  pdf_obj *res;
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  if (!doc->resources.colorspaces)
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    doc->resources.colorspaces = fz_new_hash_table(ctx, 4096, sizeof(*key), -1, pdf_drop_obj_as_void);
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  memset(key, 0, sizeof(*key));
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  fz_colorspace_digest(ctx, item, key->digest);
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  key->local_xref = doc->local_xref_nesting > 0;
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  res = fz_hash_find(ctx, doc->resources.colorspaces, (void *)key);
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  if (res)
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    pdf_keep_obj(ctx, res);
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  return res;
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0
}
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pdf_obj *
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pdf_insert_font_resource(fz_context *ctx, pdf_document *doc, pdf_font_resource_key *key, pdf_obj *obj)
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3.65k
{
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  pdf_obj *res = fz_hash_insert(ctx, doc->resources.fonts, (void *)key, obj);
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  if (res)
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    fz_warn(ctx, "warning: font resource already present");
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  else
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    res = pdf_keep_obj(ctx, obj);
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  return pdf_keep_obj(ctx, res);
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}
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pdf_obj *
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pdf_insert_colorspace_resource(fz_context *ctx, pdf_document *doc, pdf_colorspace_resource_key *key, pdf_obj *obj)
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0
{
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  pdf_obj *res = fz_hash_insert(ctx, doc->resources.colorspaces, (void *)key, obj);
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  if (res)
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    fz_warn(ctx, "warning: colorspace resource already present");
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  else
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    res = pdf_keep_obj(ctx, obj);
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  return pdf_keep_obj(ctx, res);
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}
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static int purge_local_font_resource(fz_context *ctx, void *state, void *key_, int keylen, void *val)
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{
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  pdf_font_resource_key *key = key_;
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  if (key->local_xref)
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  {
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    pdf_drop_obj(ctx, val);
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    return 1;
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  }
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  return 0;
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}
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static int purge_local_colorspace_resource(fz_context *ctx, void *state, void *key_, int keylen, void *val)
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0
{
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  pdf_colorspace_resource_key *key = key_;
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  if (key->local_xref)
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  {
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    pdf_drop_obj(ctx, val);
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    return 1;
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  }
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  return 0;
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}
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void
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pdf_purge_local_resources(fz_context *ctx, pdf_document *doc)
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9.76k
{
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  if (doc->resources.fonts)
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    fz_hash_filter(ctx, doc->resources.fonts, NULL, purge_local_font_resource);
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9.76k
  if (doc->resources.colorspaces)
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    fz_hash_filter(ctx, doc->resources.colorspaces, NULL, purge_local_colorspace_resource);
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}
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void
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pdf_drop_resource_tables(fz_context *ctx, pdf_document *doc)
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10.3k
{
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10.3k
  if (doc)
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  {
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    fz_drop_hash_table(ctx, doc->resources.fonts);
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  }
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}