--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/source/fitz/output-cbz.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,204 @@
+// Copyright (C) 2004-2024 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 <zlib.h>
+
+#include <limits.h>
+
+typedef struct
+{
+	fz_document_writer super;
+	fz_draw_options options;
+	fz_pixmap *pixmap;
+	int count;
+	fz_zip_writer *zip;
+} fz_cbz_writer;
+
+static fz_device *
+cbz_begin_page(fz_context *ctx, fz_document_writer *wri_, fz_rect mediabox)
+{
+	fz_cbz_writer *wri = (fz_cbz_writer*)wri_;
+	return fz_new_draw_device_with_options(ctx, &wri->options, mediabox, &wri->pixmap);
+}
+
+static void
+cbz_end_page(fz_context *ctx, fz_document_writer *wri_, fz_device *dev)
+{
+	fz_cbz_writer *wri = (fz_cbz_writer*)wri_;
+	fz_buffer *buffer = NULL;
+	char name[40];
+
+	fz_var(buffer);
+
+	fz_try(ctx)
+	{
+		fz_close_device(ctx, dev);
+		wri->count += 1;
+		fz_snprintf(name, sizeof name, "p%04d.png", wri->count);
+		buffer = fz_new_buffer_from_pixmap_as_png(ctx, wri->pixmap, fz_default_color_params);
+		fz_write_zip_entry(ctx, wri->zip, name, buffer, 0);
+	}
+	fz_always(ctx)
+	{
+		fz_drop_device(ctx, dev);
+		fz_drop_buffer(ctx, buffer);
+		fz_drop_pixmap(ctx, wri->pixmap);
+		wri->pixmap = NULL;
+	}
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+
+static void
+cbz_close_writer(fz_context *ctx, fz_document_writer *wri_)
+{
+	fz_cbz_writer *wri = (fz_cbz_writer*)wri_;
+	fz_close_zip_writer(ctx, wri->zip);
+}
+
+static void
+cbz_drop_writer(fz_context *ctx, fz_document_writer *wri_)
+{
+	fz_cbz_writer *wri = (fz_cbz_writer*)wri_;
+	fz_drop_zip_writer(ctx, wri->zip);
+	fz_drop_pixmap(ctx, wri->pixmap);
+}
+
+fz_document_writer *
+fz_new_cbz_writer_with_output(fz_context *ctx, fz_output *out, const char *options)
+{
+	fz_cbz_writer *wri = NULL;
+
+	fz_var(wri);
+	fz_var(out);
+
+	fz_try(ctx)
+	{
+		fz_output *out_temp = out;
+		wri = fz_new_derived_document_writer(ctx, fz_cbz_writer, cbz_begin_page, cbz_end_page, cbz_close_writer, cbz_drop_writer);
+		fz_parse_draw_options(ctx, &wri->options, options);
+		out = NULL;
+		wri->zip = fz_new_zip_writer_with_output(ctx, out_temp);
+	}
+	fz_catch(ctx)
+	{
+		fz_drop_output(ctx, out);
+		fz_free(ctx, wri);
+		fz_rethrow(ctx);
+	}
+	return (fz_document_writer*)wri;
+}
+
+fz_document_writer *
+fz_new_cbz_writer(fz_context *ctx, const char *path, const char *options)
+{
+	fz_output *out = fz_new_output_with_path(ctx, path ? path : "out.cbz", 0);
+	fz_document_writer *wri = NULL;
+	fz_try(ctx)
+		wri = fz_new_cbz_writer_with_output(ctx, out, options);
+	fz_catch(ctx)
+	{
+		fz_drop_output(ctx, out);
+		fz_rethrow(ctx);
+	}
+	return wri;
+}
+
+/* generic image file output writer */
+
+typedef struct
+{
+	fz_document_writer super;
+	fz_draw_options options;
+	fz_pixmap *pixmap;
+	void (*save)(fz_context *ctx, fz_pixmap *pix, const char *filename);
+	int count;
+	char *path;
+} fz_pixmap_writer;
+
+static fz_device *
+pixmap_begin_page(fz_context *ctx, fz_document_writer *wri_, fz_rect mediabox)
+{
+	fz_pixmap_writer *wri = (fz_pixmap_writer*)wri_;
+	return fz_new_draw_device_with_options(ctx, &wri->options, mediabox, &wri->pixmap);
+}
+
+static void
+pixmap_end_page(fz_context *ctx, fz_document_writer *wri_, fz_device *dev)
+{
+	fz_pixmap_writer *wri = (fz_pixmap_writer*)wri_;
+	char path[PATH_MAX];
+
+	fz_try(ctx)
+	{
+		fz_close_device(ctx, dev);
+		wri->count += 1;
+		fz_format_output_path(ctx, path, sizeof path, wri->path, wri->count);
+		wri->save(ctx, wri->pixmap, path);
+	}
+	fz_always(ctx)
+	{
+		fz_drop_device(ctx, dev);
+		fz_drop_pixmap(ctx, wri->pixmap);
+		wri->pixmap = NULL;
+	}
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+
+static void
+pixmap_drop_writer(fz_context *ctx, fz_document_writer *wri_)
+{
+	fz_pixmap_writer *wri = (fz_pixmap_writer*)wri_;
+	fz_drop_pixmap(ctx, wri->pixmap);
+	fz_free(ctx, wri->path);
+}
+
+fz_document_writer *
+fz_new_pixmap_writer(fz_context *ctx, const char *path, const char *options,
+	const char *default_path, int n,
+	void (*save)(fz_context *ctx, fz_pixmap *pix, const char *filename))
+{
+	fz_pixmap_writer *wri = fz_new_derived_document_writer(ctx, fz_pixmap_writer, pixmap_begin_page, pixmap_end_page, NULL, pixmap_drop_writer);
+
+	fz_try(ctx)
+	{
+		fz_parse_draw_options(ctx, &wri->options, options);
+		wri->path = fz_strdup(ctx, path ? path : default_path);
+		wri->save = save;
+		switch (n)
+		{
+		case 1: wri->options.colorspace = fz_device_gray(ctx); break;
+		case 3: wri->options.colorspace = fz_device_rgb(ctx); break;
+		case 4: wri->options.colorspace = fz_device_cmyk(ctx); break;
+		}
+	}
+	fz_catch(ctx)
+	{
+		fz_free(ctx, wri);
+		fz_rethrow(ctx);
+	}
+
+	return (fz_document_writer*)wri;
+}