/* load PDF with libpoppler
 *
 * 7/2/16
 * 	- from openslideload.c
 * 12/5/16
 * 	- add @n ... number of pages to load
 * 23/11/16
 * 	- set page-height, if we can
 * 28/6/17
 * 	- use a much larger strip size, thanks bubba
 * 8/6/18
 * 	- add background param
 * 16/8/18 [kleisauke]
 * 	- shut down the input file as soon as we can
 * 19/9/19
 * 	- reopen the input if we minimised too early
 * 11/3/20
 * 	- move on top of VipsSource
 * 21/9/20
 * 	- allow dpi and scale to both be set [le0daniel]
 * 21/4/21 kleisauke
 * 	- include GObject part from pdfload.c
 * 28/1/22
 * 	- add password
 */

/*

	This file is part of VIPS.

	VIPS is free software; you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program 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 Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301  USA

 */

/*

	These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk

 */

/*
#define DEBUG
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include <vips/vips.h>
#include <vips/buf.h>
#include <vips/internal.h>

#include "pforeign.h"

#ifdef HAVE_POPPLER

#include <cairo.h>
#include <poppler.h>

/* Render PDFs with tiles this size. They need to be pretty big to limit
 * overcomputation.
 *
 * An A4 page at 300dpi is 3508 pixels, so this should be enough to prevent
 * most rerendering.
 */
#define TILE_SIZE (4000)

#define VIPS_TYPE_FOREIGN_LOAD_PDF (vips_foreign_load_pdf_get_type())
#define VIPS_FOREIGN_LOAD_PDF(obj) \
	(G_TYPE_CHECK_INSTANCE_CAST((obj), \
		VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdf))
#define VIPS_FOREIGN_LOAD_PDF_CLASS(klass) \
	(G_TYPE_CHECK_CLASS_CAST((klass), \
		VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdfClass))
#define VIPS_IS_FOREIGN_LOAD_PDF(obj) \
	(G_TYPE_CHECK_INSTANCE_TYPE((obj), VIPS_TYPE_FOREIGN_LOAD_PDF))
#define VIPS_IS_FOREIGN_LOAD_PDF_CLASS(klass) \
	(G_TYPE_CHECK_CLASS_TYPE((klass), VIPS_TYPE_FOREIGN_LOAD_PDF))
#define VIPS_FOREIGN_LOAD_PDF_GET_CLASS(obj) \
	(G_TYPE_INSTANCE_GET_CLASS((obj), \
		VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdfClass))

typedef struct _VipsForeignLoadPdf {
	VipsForeignLoad parent_object;

	/* The VipsSource we load from, and the GInputStream we wrap around
	 * it. Set from subclasses.
	 */
	VipsSource *source;
	GInputStream *stream;

	/* Load this page.
	 */
	int page_no;

	/* Load this many pages.
	 */
	int n;

	/* Render at this DPI.
	 */
	double dpi;

	/* Scale by this factor.
	 */
	double scale;

	/* The total scale factor we render with.
	 */
	double total_scale;

	/* Background colour.
	 */
	VipsArrayDouble *background;

	/* Decrypt with this.
	 */
	const char *password;

	/* Poppler is not thread-safe, so we run inside a single-threaded
	 * cache. On the plus side, this means we only need one @page pointer,
	 * even though we change this during _generate().
	 */
	PopplerDocument *doc;
	PopplerPage *page;
	int current_page;

	/* Doc has this many pages.
	 */
	int n_pages;

	/* We need to read out the size of each page we will render, and lay
	 * them out in the final image.
	 */
	VipsRect image;
	VipsRect *pages;

	/* The [double] background converted to the image format.
	 */
	VipsPel *ink;

} VipsForeignLoadPdf;

typedef struct _VipsForeignLoadPdfClass {
	VipsForeignLoadClass parent_class;

} VipsForeignLoadPdfClass;

G_DEFINE_ABSTRACT_TYPE(VipsForeignLoadPdf, vips_foreign_load_pdf,
	VIPS_TYPE_FOREIGN_LOAD);

static void
vips_foreign_load_pdf_dispose(GObject *gobject)
{
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(gobject);

	VIPS_UNREF(pdf->page);
	VIPS_UNREF(pdf->doc);
	VIPS_UNREF(pdf->source);
	VIPS_UNREF(pdf->stream);

	G_OBJECT_CLASS(vips_foreign_load_pdf_parent_class)->dispose(gobject);
}

static int
vips_foreign_load_pdf_build(VipsObject *object)
{
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(object);

	GError *error = NULL;

	if (vips_source_rewind(pdf->source))
		return -1;

	pdf->total_scale = pdf->scale * pdf->dpi / 72.0;

	pdf->stream = vips_g_input_stream_new_from_source(pdf->source);
	if (!(pdf->doc = poppler_document_new_from_stream(pdf->stream,
			  vips_source_length(pdf->source), pdf->password,
			  NULL, &error))) {
		vips_g_error(&error);
		return -1;
	}

	if (VIPS_OBJECT_CLASS(vips_foreign_load_pdf_parent_class)->build(object))
		return -1;

	return 0;
}

static VipsForeignFlags
vips_foreign_load_pdf_get_flags_filename(const char *filename)
{
	/* We can render any part of the page on demand.
	 */
	return VIPS_FOREIGN_PARTIAL;
}

static VipsForeignFlags
vips_foreign_load_pdf_get_flags(VipsForeignLoad *load)
{
	return VIPS_FOREIGN_PARTIAL;
}

static int
vips_foreign_load_pdf_get_page(VipsForeignLoadPdf *pdf, int page_no)
{
	if (pdf->current_page != page_no ||
		!pdf->page) {
		VipsObjectClass *class = VIPS_OBJECT_GET_CLASS(pdf);

		VIPS_UNREF(pdf->page);
		pdf->current_page = -1;

#ifdef DEBUG
		printf("vips_foreign_load_pdf_get_page: %d\n", page_no);
#endif /*DEBUG*/

		if (!(pdf->page =
					poppler_document_get_page(pdf->doc, page_no))) {
			vips_error(class->nickname,
				_("unable to load page %d"), page_no);
			return -1;
		}
		pdf->current_page = page_no;
	}

	return 0;
}

/* String-based metadata fields we extract.
 */
typedef struct _VipsForeignLoadPdfMetadata {
	char *(*pdf_fetch)(PopplerDocument *doc);
	char *field;
} VipsForeignLoadPdfMetadata;

static VipsForeignLoadPdfMetadata vips_foreign_load_pdf_metadata[] = {
	{ poppler_document_get_title, "pdf-title" },
	{ poppler_document_get_author, "pdf-author" },
	{ poppler_document_get_subject, "pdf-subject" },
	{ poppler_document_get_keywords, "pdf-keywords" },
	{ poppler_document_get_creator, "pdf-creator" },
	{ poppler_document_get_producer, "pdf-producer" },
	{ poppler_document_get_metadata, "pdf-metadata" },
};
static int n_metadata = VIPS_NUMBER(vips_foreign_load_pdf_metadata);

static int
vips_foreign_load_pdf_set_image(VipsForeignLoadPdf *pdf, VipsImage *out)
{
	int i;
	double res;

#ifdef DEBUG
	printf("vips_foreign_load_pdf_set_image: %p\n", pdf);
#endif /*DEBUG*/

	/* Extract and attach metadata. Set the old name too for compat.
	 */
	vips_image_set_int(out, "pdf-n_pages", pdf->n_pages);
	vips_image_set_int(out, VIPS_META_N_PAGES, pdf->n_pages);

	for (i = 0; i < n_metadata; i++) {
		VipsForeignLoadPdfMetadata *metadata =
			&vips_foreign_load_pdf_metadata[i];

		char *str;

		if ((str = metadata->pdf_fetch(pdf->doc))) {
			vips_image_set_string(out, metadata->field, str);
			g_free(str);
		}
	}

	/* We need pixels/mm for vips.
	 */
	res = pdf->dpi / 25.4;

	vips_image_init_fields(out,
		pdf->image.width, pdf->image.height,
		4, VIPS_FORMAT_UCHAR,
		VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB, res, res);

	/* We render to a tilecache, so it has to be SMALLTILE.
	 */
	if (vips_image_pipelinev(out, VIPS_DEMAND_STYLE_SMALLTILE, NULL))
		return -1;

	return 0;
}

static int
vips_foreign_load_pdf_header(VipsForeignLoad *load)
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS(load);
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(load);

	int top;
	int i;

#ifdef DEBUG
	printf("vips_foreign_load_pdf_header: %p\n", pdf);
#endif /*DEBUG*/

	pdf->n_pages = poppler_document_get_n_pages(pdf->doc);

	/* @n == -1 means until the end of the doc.
	 */
	if (pdf->n == -1)
		pdf->n = pdf->n_pages - pdf->page_no;

	if (pdf->page_no + pdf->n > pdf->n_pages ||
		pdf->page_no < 0 ||
		pdf->n <= 0) {
		vips_error(class->nickname, "%s", _("pages out of range"));
		return -1;
	}

	/* Lay out the pages in our output image.
	 */
	if (!(pdf->pages = VIPS_ARRAY(pdf, pdf->n, VipsRect)))
		return -1;

	top = 0;
	pdf->image.left = 0;
	pdf->image.top = 0;
	pdf->image.width = 0;
	pdf->image.height = 0;
	for (i = 0; i < pdf->n; i++) {
		double width;
		double height;

		if (vips_foreign_load_pdf_get_page(pdf, pdf->page_no + i))
			return -1;
		poppler_page_get_size(pdf->page, &width, &height);
		pdf->pages[i].left = 0;
		pdf->pages[i].top = top;
		/* We do round to nearest, in the same way that vips_resize()
		 * does round to nearest. Without this, things like
		 * shrink-on-load will break.
		 */
		pdf->pages[i].width = VIPS_RINT(width * pdf->total_scale);
		pdf->pages[i].height = VIPS_RINT(height * pdf->total_scale);

		if (pdf->pages[i].width > pdf->image.width)
			pdf->image.width = pdf->pages[i].width;
		pdf->image.height += pdf->pages[i].height;

		top += pdf->pages[i].height;
	}

	/* If all pages are the same height, we can tag this as a toilet roll
	 * image.
	 */
	for (i = 1; i < pdf->n; i++)
		if (pdf->pages[i].height != pdf->pages[0].height)
			break;

	/* Only set page-height if we have more than one page, or this could
	 * accidentally turn into an animated image later.
	 */
	if (pdf->n > 1)
		vips_image_set_int(load->out,
			VIPS_META_PAGE_HEIGHT, pdf->pages[0].height);

	vips_foreign_load_pdf_set_image(pdf, load->out);

	/* Convert the background to the image format.
	 */
	if (!(pdf->ink = vips__vector_to_ink(class->nickname,
			  load->out,
			  VIPS_AREA(pdf->background)->data, NULL,
			  VIPS_AREA(pdf->background)->n)))
		return -1;

	/* Swap to cairo-style premultiplied bgra.
	 */
	vips__rgba2bgra_premultiplied((guint32 *) pdf->ink, 1);

	vips_source_minimise(pdf->source);

	return 0;
}

static void
vips_foreign_load_pdf_minimise(VipsImage *image, VipsForeignLoadPdf *pdf)
{
	vips_source_minimise(pdf->source);
}

static int
vips_foreign_load_pdf_generate(VipsRegion *out_region,
	void *seq, void *a, void *b, gboolean *stop)
{
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(a);
	VipsRect *r = &out_region->valid;

	int top;
	int i;
	int y;

	/*
	printf("vips_foreign_load_pdf_generate: "
		   "left = %d, top = %d, width = %d, height = %d\n",
		r->left, r->top, r->width, r->height);
	 */

	/* Poppler won't always paint the background.
	 */
	vips_region_paint_pel(out_region, r, pdf->ink);

	/* Search through the pages we are drawing for the first containing
	 * this rect. This could be quicker, perhaps a binary search, but who
	 * cares.
	 */
	for (i = 0; i < pdf->n; i++)
		if (VIPS_RECT_BOTTOM(&pdf->pages[i]) > r->top)
			break;

	top = r->top;
	while (top < VIPS_RECT_BOTTOM(r)) {
		VipsRect rect;
		cairo_surface_t *surface;
		cairo_t *cr;

		vips_rect_intersectrect(r, &pdf->pages[i], &rect);

		surface = cairo_image_surface_create_for_data(
			VIPS_REGION_ADDR(out_region, rect.left, rect.top),
			CAIRO_FORMAT_ARGB32,
			rect.width, rect.height,
			VIPS_REGION_LSKIP(out_region));
		cr = cairo_create(surface);
		cairo_surface_destroy(surface);

		cairo_scale(cr, pdf->total_scale, pdf->total_scale);
		cairo_translate(cr,
			(pdf->pages[i].left - rect.left) / pdf->total_scale,
			(pdf->pages[i].top - rect.top) / pdf->total_scale);

		/* poppler is single-threaded, but we don't need to lock since
		 * we're running inside a non-threaded tilecache.
		 */
		if (vips_foreign_load_pdf_get_page(pdf, pdf->page_no + i))
			return -1;
		poppler_page_render(pdf->page, cr);

		cairo_destroy(cr);

		top += rect.height;
		i += 1;
	}

	/* Cairo makes pre-multipled BRGA, we must byteswap and unpremultiply.
	 */
	for (y = 0; y < r->height; y++)
		vips__premultiplied_bgra2rgba(
			(guint32 *) VIPS_REGION_ADDR(out_region, r->left, r->top + y),
			r->width);

	return 0;
}

static int
vips_foreign_load_pdf_load(VipsForeignLoad *load)
{
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(load);
	VipsImage **t = (VipsImage **)
		vips_object_local_array((VipsObject *) load, 2);

#ifdef DEBUG
	printf("vips_foreign_load_pdf_load: %p\n", pdf);
#endif /*DEBUG*/

	/* Read to this image, then cache to out, see below.
	 */
	t[0] = vips_image_new();

	/* Close input immediately at end of read.
	 */
	g_signal_connect(t[0], "minimise",
		G_CALLBACK(vips_foreign_load_pdf_minimise), pdf);

	vips_foreign_load_pdf_set_image(pdf, t[0]);
	if (vips_image_generate(t[0],
			NULL, vips_foreign_load_pdf_generate, NULL, pdf, NULL) ||
		vips_tilecache(t[0], &t[1],
			"tile_width", TILE_SIZE,
			"tile_height", TILE_SIZE,
			"max_tiles", 2 * (1 + t[0]->Xsize / TILE_SIZE),
			NULL) ||
		vips_image_write(t[1], load->real))
		return -1;

	return 0;
}

static void
vips_foreign_load_pdf_class_init(VipsForeignLoadPdfClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS(class);
	VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;

	gobject_class->dispose = vips_foreign_load_pdf_dispose;
	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "pdfload_base";
	object_class->description = _("load PDF with libpoppler");
	object_class->build = vips_foreign_load_pdf_build;

	/* libpoppler is fuzzed, but not by us.
	 */
	operation_class->flags |= VIPS_OPERATION_UNTRUSTED;

	load_class->get_flags_filename =
		vips_foreign_load_pdf_get_flags_filename;
	load_class->get_flags = vips_foreign_load_pdf_get_flags;
	load_class->header = vips_foreign_load_pdf_header;
	load_class->load = vips_foreign_load_pdf_load;

	VIPS_ARG_INT(class, "page", 20,
		_("Page"),
		_("First page to load"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdf, page_no),
		0, 100000, 0);

	VIPS_ARG_INT(class, "n", 21,
		_("n"),
		_("Number of pages to load, -1 for all"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdf, n),
		-1, 100000, 1);

	VIPS_ARG_DOUBLE(class, "dpi", 22,
		_("DPI"),
		_("DPI to render at"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdf, dpi),
		0.001, 100000.0, 72.0);

	VIPS_ARG_DOUBLE(class, "scale", 23,
		_("Scale"),
		_("Factor to scale by"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdf, scale),
		0.001, 100000.0, 1.0);

	VIPS_ARG_BOXED(class, "background", 24,
		_("Background"),
		_("Background colour"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdf, background),
		VIPS_TYPE_ARRAY_DOUBLE);

	VIPS_ARG_STRING(class, "password", 25,
		_("Password"),
		_("Password to decrypt with"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdf, password),
		NULL);
}

static void
vips_foreign_load_pdf_init(VipsForeignLoadPdf *pdf)
{
	pdf->dpi = 72.0;
	pdf->scale = 1.0;
	pdf->n = 1;
	pdf->current_page = -1;
	pdf->background = vips_array_double_newv(1, 255.0);
}

typedef struct _VipsForeignLoadPdfFile {
	VipsForeignLoadPdf parent_object;

	/* Filename for load.
	 */
	char *filename;

	char *uri;

} VipsForeignLoadPdfFile;

typedef VipsForeignLoadPdfClass VipsForeignLoadPdfFileClass;

G_DEFINE_TYPE(VipsForeignLoadPdfFile, vips_foreign_load_pdf_file,
	vips_foreign_load_pdf_get_type());

static void
vips_foreign_load_pdf_file_dispose(GObject *gobject)
{
	VipsForeignLoadPdfFile *file =
		(VipsForeignLoadPdfFile *) gobject;

	VIPS_FREE(file->uri);

	G_OBJECT_CLASS(vips_foreign_load_pdf_file_parent_class)->dispose(gobject);
}

static int
vips_foreign_load_pdf_file_header(VipsForeignLoad *load)
{
	VipsForeignLoadPdfFile *file = (VipsForeignLoadPdfFile *) load;

	VIPS_SETSTR(load->out->filename, file->filename);

	return VIPS_FOREIGN_LOAD_CLASS(vips_foreign_load_pdf_file_parent_class)
		->header(load);
}

static const char *vips_foreign_pdf_suffs[] = {
	".pdf",
	NULL
};

static int
vips_foreign_load_pdf_file_build(VipsObject *object)
{
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(object);
	VipsForeignLoadPdfFile *file = (VipsForeignLoadPdfFile *) pdf;

#ifdef DEBUG
	printf("vips_foreign_load_pdf_file_build: %s\n", file->filename);
#endif /*DEBUG*/

	if (file->filename) {
		char *path;
		GError *error = NULL;

		/* We need an absolute path for a URI.
		 */
		path = vips_realpath(file->filename);
		if (!(file->uri = g_filename_to_uri(path, NULL, &error))) {
			g_free(path);
			vips_g_error(&error);
			return -1;
		}
		g_free(path);

		if (!(pdf->source =
					vips_source_new_from_file(file->filename)))
			return -1;
	}

	return VIPS_OBJECT_CLASS(vips_foreign_load_pdf_file_parent_class)
		->build(object);
}

static gboolean
vips_foreign_load_pdf_is_a_buffer(const void *buf, size_t len)
{
	const guchar *str = (const guchar *) buf;

	if (len >= 4 &&
		str[0] == '%' &&
		str[1] == 'P' &&
		str[2] == 'D' &&
		str[3] == 'F')
		return 1;

	return 0;
}

static gboolean
vips_foreign_load_pdf_is_a(const char *filename)
{
	unsigned char buf[4];

	if (vips__get_bytes(filename, buf, 4) == 4 &&
		vips_foreign_load_pdf_is_a_buffer(buf, 4))
		return 1;

	return 0;
}

static void
vips_foreign_load_pdf_file_class_init(
	VipsForeignLoadPdfFileClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsForeignClass *foreign_class = (VipsForeignClass *) class;
	VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;

	gobject_class->dispose = vips_foreign_load_pdf_file_dispose;
	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "pdfload";
	object_class->description = _("load PDF from file");
	object_class->build = vips_foreign_load_pdf_file_build;

	foreign_class->suffs = vips_foreign_pdf_suffs;

	load_class->is_a = vips_foreign_load_pdf_is_a;
	load_class->header = vips_foreign_load_pdf_file_header;

	VIPS_ARG_STRING(class, "filename", 1,
		_("Filename"),
		_("Filename to load from"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdfFile, filename),
		NULL);
}

static void
vips_foreign_load_pdf_file_init(VipsForeignLoadPdfFile *file)
{
}

typedef struct _VipsForeignLoadPdfBuffer {
	VipsForeignLoadPdf parent_object;

	/* Load from a buffer.
	 */
	VipsArea *buf;

} VipsForeignLoadPdfBuffer;

typedef VipsForeignLoadPdfClass VipsForeignLoadPdfBufferClass;

G_DEFINE_TYPE(VipsForeignLoadPdfBuffer, vips_foreign_load_pdf_buffer,
	vips_foreign_load_pdf_get_type());

static int
vips_foreign_load_pdf_buffer_build(VipsObject *object)
{
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(object);
	VipsForeignLoadPdfBuffer *buffer = (VipsForeignLoadPdfBuffer *) pdf;

	if (buffer->buf &&
		!(pdf->source = vips_source_new_from_memory(
			  VIPS_AREA(buffer->buf)->data,
			  VIPS_AREA(buffer->buf)->length)))
		return -1;

	return VIPS_OBJECT_CLASS(vips_foreign_load_pdf_buffer_parent_class)
		->build(object);
}

static void
vips_foreign_load_pdf_buffer_class_init(
	VipsForeignLoadPdfBufferClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;

	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "pdfload_buffer";
	object_class->description = _("load PDF from buffer");
	object_class->build = vips_foreign_load_pdf_buffer_build;

	load_class->is_a_buffer = vips_foreign_load_pdf_is_a_buffer;

	VIPS_ARG_BOXED(class, "buffer", 1,
		_("Buffer"),
		_("Buffer to load from"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdfBuffer, buf),
		VIPS_TYPE_BLOB);
}

static void
vips_foreign_load_pdf_buffer_init(VipsForeignLoadPdfBuffer *buffer)
{
}

typedef struct _VipsForeignLoadPdfSource {
	VipsForeignLoadPdf parent_object;

	VipsSource *source;

} VipsForeignLoadPdfSource;

typedef VipsForeignLoadPdfClass VipsForeignLoadPdfSourceClass;

G_DEFINE_TYPE(VipsForeignLoadPdfSource, vips_foreign_load_pdf_source,
	vips_foreign_load_pdf_get_type());

static int
vips_foreign_load_pdf_source_build(VipsObject *object)
{
	VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF(object);
	VipsForeignLoadPdfSource *source = (VipsForeignLoadPdfSource *) pdf;

	if (source->source) {
		pdf->source = source->source;
		g_object_ref(pdf->source);
	}

	return VIPS_OBJECT_CLASS(vips_foreign_load_pdf_source_parent_class)
		->build(object);
}

static gboolean
vips_foreign_load_pdf_source_is_a_source(VipsSource *source)
{
	const unsigned char *p;

	return (p = vips_source_sniff(source, 4)) &&
		p[0] == '%' &&
		p[1] == 'P' &&
		p[2] == 'D' &&
		p[3] == 'F';
}

static void
vips_foreign_load_pdf_source_class_init(
	VipsForeignLoadPdfSourceClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS(class);
	VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;

	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "pdfload_source";
	object_class->description = _("load PDF from source");
	object_class->build = vips_foreign_load_pdf_source_build;

	operation_class->flags |= VIPS_OPERATION_NOCACHE;

	load_class->is_a_source = vips_foreign_load_pdf_source_is_a_source;

	VIPS_ARG_OBJECT(class, "source", 1,
		_("Source"),
		_("Source to load from"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsForeignLoadPdfSource, source),
		VIPS_TYPE_SOURCE);
}

static void
vips_foreign_load_pdf_source_init(VipsForeignLoadPdfSource *source)
{
}

#endif /*defined(HAVE_POPPLER)*/

/* The C API wrappers are defined in foreign.c.
 */
