seems to work

src/mupdf_ffi.rs

@@ -2,14 +2,16 @@
 // See Notices.txt for copyright information
 
 use mupdf_sys::{
-    fz_clone_context, fz_color_params, fz_colorspace, fz_concat, fz_context, fz_device,
-    fz_document, fz_drop_context, fz_drop_device, fz_drop_document, fz_drop_page, fz_drop_path,
-    fz_drop_text, fz_error_type_FZ_ERROR_GENERIC, fz_font, fz_font_ascender, fz_font_descender,
-    fz_font_is_bold, fz_font_is_italic, fz_font_name, fz_matrix, fz_matrix_expansion, fz_page,
-    fz_path, fz_path_walker, fz_point, fz_rect, fz_stroke_state, fz_text, fz_text_item,
-    fz_text_span, fz_transform_point, fz_transform_point_xy, fz_transform_vector, fz_walk_path,
-    mupdf_document_page_count, mupdf_drop_error, mupdf_error_t, mupdf_load_page,
-    mupdf_new_base_context, mupdf_new_derived_device, mupdf_open_document, mupdf_run_page,
+    fz_buffer, fz_buffer_storage, fz_clone_context, fz_color_params, fz_colorspace, fz_concat,
+    fz_context, fz_device, fz_document, fz_drop_buffer, fz_drop_context, fz_drop_device,
+    fz_drop_document, fz_drop_page, fz_drop_path, fz_drop_text, fz_error_type_FZ_ERROR_GENERIC,
+    fz_font, fz_font_ascender, fz_font_descender, fz_font_is_bold, fz_font_is_italic, fz_font_name,
+    fz_matrix, fz_matrix_expansion, fz_page, fz_path, fz_path_walker, fz_point, fz_rect,
+    fz_stroke_state, fz_text, fz_text_item, fz_text_span, fz_transform_point,
+    fz_transform_point_xy, fz_transform_vector, fz_walk_path, mupdf_document_page_count,
+    mupdf_drop_error, mupdf_error_t, mupdf_load_page, mupdf_new_base_context,
+    mupdf_new_derived_device, mupdf_open_document, mupdf_page_to_xml, mupdf_pdf_page_transform,
+    mupdf_run_page, pdf_page, pdf_page_from_fz_page,
 };
 use std::{
     cell::{Cell, UnsafeCell},
@@ -172,6 +174,33 @@ impl<'ctx> Drop for Document<'ctx> {
     }
 }
 
+struct Buffer<'ctx> {
+    ptr: *mut fz_buffer,
+    ctx: ContextRef<'ctx>,
+}
+
+impl<'ctx> Buffer<'ctx> {
+    fn storage(&mut self) -> &mut [u8] {
+        unsafe {
+            let mut ptr = ptr::null_mut();
+            let len = fz_buffer_storage(self.ctx.0.get(), self.ptr, &raw mut ptr);
+            if len == 0 {
+                &mut []
+            } else {
+                std::slice::from_raw_parts_mut(ptr, len)
+            }
+        }
+    }
+}
+
+impl<'ctx> Drop for Buffer<'ctx> {
+    fn drop(&mut self) {
+        unsafe {
+            fz_drop_buffer(self.ctx.0.get(), self.ptr);
+        }
+    }
+}
+
 pub(crate) struct Page<'ctx> {
     ptr: *mut fz_page,
     ctx: ContextRef<'ctx>,
@@ -199,6 +228,25 @@ impl<'ctx> Page<'ctx> {
             })
         }
     }
+    pub(crate) fn to_xml(&self) -> Result<String, MuPdfError> {
+        unsafe {
+            let mut buffer =
+                mupdf_try(|errptr| mupdf_page_to_xml(self.ctx.0.get(), self.ptr, errptr))
+                    .map(|ptr| Buffer { ptr, ctx: self.ctx })?;
+            Ok(str::from_utf8(buffer.storage())
+                .map_err(MuPdfError::new_generic)?
+                .into())
+        }
+    }
+    pub(crate) fn pdf_page<'a>(&'a self) -> Option<PdfPageRef<'a, 'ctx>> {
+        unsafe {
+            let ptr = pdf_page_from_fz_page(self.ctx.0.get(), self.ptr);
+            NonNull::new(ptr).map(|ptr| PdfPageRef {
+                ptr: &*ptr.as_ptr().cast(),
+                ctx: self.ctx,
+            })
+        }
+    }
 }
 
 impl<'ctx> Drop for Page<'ctx> {
@@ -209,6 +257,20 @@ impl<'ctx> Drop for Page<'ctx> {
     }
 }
 
+#[derive(Clone, Copy)]
+pub(crate) struct PdfPageRef<'a, 'ctx> {
+    ptr: &'a UnsafeCell<pdf_page>,
+    ctx: ContextRef<'ctx>,
+}
+
+impl<'a, 'ctx> PdfPageRef<'a, 'ctx> {
+    pub(crate) fn transform(self) -> Result<fz_matrix, MuPdfError> {
+        unsafe {
+            mupdf_try(|errptr| mupdf_pdf_page_transform(self.ctx.0.get(), self.ptr.get(), errptr))
+        }
+    }
+}
+
 pub(crate) struct Device<'ctx, T: 'ctx> {
     dev: *mut fz_device,
     ctx: ContextRef<'ctx>,