From 0ed8246becde25ee82afb80139103b42a20374c3 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Wed, 3 May 2017 11:25:24 +0200
Subject: Detect CBF files, interface bits

---
 libcrystfel/src/image.c | 70 ++++++++++++++++++++++++++++++++++++++++++-------
 libcrystfel/src/image.h | 19 +++++++++++---
 2 files changed, 76 insertions(+), 13 deletions(-)

diff --git a/libcrystfel/src/image.c b/libcrystfel/src/image.c
index 5aa2f9c3..29e5d5e1 100644
--- a/libcrystfel/src/image.c
+++ b/libcrystfel/src/image.c
@@ -32,6 +32,7 @@
 #include <math.h>
 #include <stdio.h>
 #include <hdf5.h>
+#include <cbflib/cbf.h>
 
 #include "image.h"
 #include "utils.h"
@@ -379,14 +380,25 @@ void add_imagefile_field(struct imagefile_field_list *copyme, const char *name)
 }
 
 
-/****************************** Image files ***********************************/
+/******************************* CBF files ************************************/
 
-enum imagefile_type
+static int read_cbf(struct imagefile *f, struct image *image)
 {
-	IMAGEFILE_HDF5,
-	IMAGEFILE_CBF
-};
+	cbf_handle cbfh;
+
+	if ( cbf_make_handle(&cbfh) ) {
+		ERROR("Failed to allocate CBF handle\n");
+		return 1;
+	}
+
+	ERROR("Mock CBF read\n");
+
+	cbf_free_handle(cbfh);
+	return 0;
+}
+
 
+/****************************** Image files ***********************************/
 
 struct imagefile
 {
@@ -395,6 +407,25 @@ struct imagefile
 };
 
 
+static signed int is_cbf_file(const char *filename)
+{
+	FILE *fh;
+	char line[1024];
+
+	fh = fopen(filename, "r");
+	if ( fh == NULL ) return -1;
+
+	if ( fgets(line, 1024, fh) == NULL ) return -1;
+	fclose(fh);
+
+	if ( strstr(line, "CBF") == NULL ) {
+		return 0;
+	}
+
+	return 1;
+}
+
+
 struct imagefile *imagefile_open(const char *filename)
 {
 	struct imagefile *f;
@@ -413,10 +444,9 @@ struct imagefile *imagefile_open(const char *filename)
 			return NULL;
 		}
 
-	} else {
+	} else if ( is_cbf_file(filename) > 0 ) {
 
-		STATUS("Mock CBF check\n");
-		return NULL;
+		f->type = IMAGEFILE_CBF;
 
 	}
 
@@ -429,13 +459,35 @@ int imagefile_read(struct imagefile *f, struct image *image,
 {
 	if ( f->type == IMAGEFILE_HDF5 ) {
 		return hdf5_read2(f->hdfile, image, event, 0);
+	} else if ( f->type == IMAGEFILE_CBF ) {
+		return read_cbf(f, image);
+	} else {
+		ERROR("Unknown file type %i\n", f->type);
+		return 1;
+	}
+}
+
+
+/* Read a simple file, no multi-event, no prior geometry etc, and
+ * generate a geometry for it */
+int imagefile_read_simple(struct imagefile *f, struct image *image)
+{
+	if ( f->type == IMAGEFILE_HDF5 ) {
+		return hdf5_read(f->hdfile, image, NULL, 0);
 	} else {
-		STATUS("Mock CBF read\n");
+		STATUS("Mock CBF simple read\n");
 		return 0;
 	}
 }
 
 
+enum imagefile_type imagefile_get_type(struct imagefile *f)
+{
+	assert(f != NULL);
+	return f->type;
+}
+
+
 struct hdfile *imagefile_get_hdfile(struct imagefile *f)
 {
 	if ( f->type != IMAGEFILE_HDF5 ) {
diff --git a/libcrystfel/src/image.h b/libcrystfel/src/image.h
index f310a09b..ead5cd4d 100644
--- a/libcrystfel/src/image.h
+++ b/libcrystfel/src/image.h
@@ -90,6 +90,15 @@ struct imagefeature {
 	const char                      *name;
 };
 
+
+/* An enum representing the image file formats we can handle */
+enum imagefile_type
+{
+	IMAGEFILE_HDF5,
+	IMAGEFILE_CBF
+};
+
+
 /* An opaque type representing a list of image features */
 typedef struct _imagefeaturelist ImageFeatureList;
 
@@ -238,13 +247,15 @@ extern void free_all_crystals(struct image *image);
 
 /* Image files */
 extern struct imagefile *imagefile_open(const char *filename);
-extern int imagefile_read(struct imagefile *imfile, struct image *image,
+extern int imagefile_read(struct imagefile *f, struct image *image,
                           struct event *event);
-extern struct hdfile *imagefile_get_hdfile(struct imagefile *imfile);
-extern void imagefile_copy_fields(struct imagefile *imfile,
+extern int imagefile_read_simple(struct imagefile *f, struct image *image);
+extern struct hdfile *imagefile_get_hdfile(struct imagefile *f);
+extern enum imagefile_type imagefile_get_type(struct imagefile *f);
+extern void imagefile_copy_fields(struct imagefile *f,
                                   const struct imagefile_field_list *copyme,
                                   FILE *fh, struct event *ev);
-extern void imagefile_close(struct imagefile *imfile);
+extern void imagefile_close(struct imagefile *f);
 
 /* Field lists */
 extern struct imagefile_field_list *new_imagefile_field_list(void);
-- 
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