Add Meta interface to fz_document.

Use this to reintroduce "Document Properties..." in mupdf viewer.

3 files changed, 79 insertions, 0 deletions

diff --git a/fitz/doc_document.c b/fitz/doc_document.c
index 2da7a110..095a7fb5 100644
--- a/fitz/doc_document.c
+++ b/fitz/doc_document.c
@@ -113,3 +113,11 @@ fz_free_page(fz_document *doc, fz_page *page)
 	if (doc && doc->free_page && page)
 		doc->free_page(doc, page);
 }
+
+int
+fz_meta(fz_document *doc, int key, void *ptr, int size)
+{
+	if (doc && doc->meta)
+		return doc->meta(doc, key, ptr, size);
+	return FZ_META_UNKNOWN_KEY;
+}
diff --git a/fitz/fitz-internal.h b/fitz/fitz-internal.h
index b47d984a..bd19886c 100644
--- a/fitz/fitz-internal.h
+++ b/fitz/fitz-internal.h
@@ -1079,6 +1079,7 @@ struct fz_document_s
 	fz_rect (*bound_page)(fz_document *doc, fz_page *page);
 	void (*run_page)(fz_document *doc, fz_page *page, fz_device *dev, fz_matrix transform, fz_cookie *cookie);
 	void (*free_page)(fz_document *doc, fz_page *page);
+	int (*meta)(fz_document *doc, int key, void *ptr, int size);
 };
 
 #endif
diff --git a/fitz/fitz.h b/fitz/fitz.h
index 1355c740..472b5ac9 100644
--- a/fitz/fitz.h
+++ b/fitz/fitz.h
@@ -2154,4 +2154,74 @@ void fz_run_page(fz_document *doc, fz_page *page, fz_device *dev, fz_matrix tran
 */
 void fz_free_page(fz_document *doc, fz_page *page);
 
+/*
+	fz_meta: Perform a meta operation on a document.
+
+	Meta operations provide a way to perform format specific
+	operations on a document. The meta operation scheme is
+	designed to be extensible so that new features can be
+	transparently added in later versions of the library.
+
+	doc: The document on which to perform the meta operation.
+
+	key: The meta operation to try. If a particular operation
+	is unsupported on a given document, the function will return
+	FZ_META_UNKNOWN_KEY.
+
+	ptr: An operation dependent (possibly NULL) pointer.
+
+	size: An operation dependent integer. Often this will
+	be the size of the block pointed to by ptr, but not always.
+
+	Returns an operation dependent value; FZ_META_UNKNOWN_KEY
+	always means "unknown operation for this document". In general
+	FZ_META_OK should be used to indicate successful operation.
+*/
+int fz_meta(fz_document *doc, int key, void *ptr, int size);
+
+enum
+{
+	FZ_META_UNKNOWN_KEY = -1,
+	FZ_META_OK = 0,
+
+	/*
+		ptr: Pointer to block (uninitialised on entry)
+		size: Size of block (at least 64 bytes)
+		Returns: Document format as a brief text string.
+		All formats should support this.
+	*/
+	FZ_META_FORMAT_INFO = 1,
+
+	/*
+		ptr: Pointer to block (uninitialised on entry)
+		size: Size of block (at least 64 bytes)
+		Returns: Encryption info as a brief text string.
+	*/
+	FZ_META_CRYPT_INFO = 2,
+
+	/*
+		ptr: NULL
+		size: Which permission to check
+		Returns: 1 if permitted, 0 otherwise.
+	*/
+	FZ_META_HAS_PERMISSION = 3,
+
+	FZ_PERMISSION_PRINT = 0,
+	FZ_PERMISSION_CHANGE = 1,
+	FZ_PERMISSION_COPY = 2,
+	FZ_PERMISSION_NOTES = 3,
+
+	/*
+		ptr: Pointer to block. First entry in the block is
+		a pointer to a UCS string to lookup. The rest of the
+		block is uninitialised on entry.
+		size: size of the block in bytes.
+		Returns: 0 if not found. 1 if found. The string
+		result is copied into the block (truncated to size
+		and NULL terminated)
+
+	*/
+	FZ_META_INFO = 4,
+};
+
 #endif