Basics of MAT exporting

7 files changed, 281 insertions, 7 deletions

diff --git a/src/common.h b/src/common.h
new file mode 100644
index 0000000..7f1e41c
--- /dev/null
+++ b/src/common.h
@@ -0,0 +1,9 @@
+#include <stdlib.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <errno.h>
+#include <uthash.h>
+#include "eli.h"
+
+#define HASH_FOR(i, head, field) for ((i) = (head); (i); (i) = (i)->field.next)
+#define errorf(fmt, ...) (fprintf(stderr, fmt, ##__VA_ARGS__))
diff --git a/src/e2e.c b/src/e2e.c
index f2728c1..5ac9f6c 100644
--- a/src/e2e.c
+++ b/src/e2e.c
@@ -1,3 +1,4 @@
+#include "common.h"
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/src/e2e.h b/src/e2e.h
index 960aa3e..65428ea 100644
--- a/src/e2e.h
+++ b/src/e2e.h
@@ -2,8 +2,6 @@
 #include <uthash.h>
 #include "eli.h"
 
-#define errorf(fmt, ...) (fprintf(stderr, fmt, ##__VA_ARGS__))
-
 #define E2E_NONE 0xffffffff
 
 #define E2E_IMAGE_FUNDUS    0x02010201
diff --git a/src/eli.h b/src/eli.h
index 8cd75a6..4a387f7 100644
--- a/src/eli.h
+++ b/src/eli.h
@@ -16,6 +16,9 @@ along with this program; if not, write to the Free Software Foundation,
 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */
 
+#ifndef _ELI_H
+#define _ELI_H
+
 #include <stddef.h> // size_t
 
 #define eli_rebase(x, xm, y) \
@@ -82,3 +85,5 @@ eli_unlink_real((void**)(pphead), (entry), &((*(pphead))->member), &((entry)->me
 // Loop over a list
 #define eli_for(i, head, member) \
 for ((i) = (head); (i); (i) = (i)->member.next)
+
+#endif // _ELI_H
diff --git a/src/export.c b/src/export.c
new file mode 100644
index 0000000..5a98f2d
--- /dev/null
+++ b/src/export.c
@@ -0,0 +1,259 @@
+#include "common.h"
+#include <matio.h>
+
+#include "e2e.h"
+#include "export.h"
+
+static size_t dims_scalar = 1;
+
+#define COUNT(x) (sizeof(x) / sizeof((x)[0]))
+
+matvar_t *create_int(const int *value)
+{
+	return Mat_VarCreate(NULL, MAT_C_INT32, MAT_T_INT32, 1, &dims_scalar,
+	                     (int*)value, 0);
+}
+
+matvar_t *create_struct(const char **fields, int nfields)
+{
+	return Mat_VarCreateStruct(NULL, 1, &dims_scalar, fields, nfields);
+}
+
+
+static int export_tomogram(const struct e2e_slice *slices, matvar_t **tomogram,
+                           matvar_t **slice_ids)
+{
+	size_t i, dims[3], zstride;
+	int *ids;
+	const struct e2e_slice *slice;
+	float *image3d;
+
+	dims[0] = slices->image->width;
+	dims[1] = slices->image->height;
+	dims[2] = HASH_COUNT(slices);
+
+	ids = calloc(dims[2], sizeof(int));
+	if (!ids)
+		return ENOMEM;
+
+	i = 0;
+	HASH_FOR(slice, slices, hh)
+		ids[i++] = slice->id;
+
+	*slice_ids = Mat_VarCreate(NULL, MAT_C_INT32, MAT_T_INT32, 1, dims + 2,
+	                           ids, 0);
+	free(ids);
+	if (!*slice_ids)
+		return ENOMEM;
+
+	// FIXME: check overflow
+	zstride = dims[0] * dims[1];
+	image3d = calloc(zstride * dims[2], sizeof(float));
+	if (!image3d)
+		goto error_image3d;
+
+	i = 0;
+	HASH_FOR(slice, slices, hh)
+		memcpy(image3d + i * zstride, slice->image->tomogram,
+	               zstride * sizeof(float));
+
+	*tomogram = Mat_VarCreate(NULL, MAT_C_SINGLE, MAT_T_SINGLE, 3, dims,
+	                          image3d, 0);
+	free(image3d);
+	if (!*tomogram)
+		goto error_image3d;
+
+	return 0;
+
+error_image3d:
+	Mat_VarFree(*slice_ids);
+	return ENOMEM;
+}
+
+static int export_series(const struct e2e_series *series, matvar_t **out)
+{
+	int rv;
+	size_t i, dims;
+	const struct e2e_series *series1;
+
+	dims = HASH_COUNT(series);
+	*out = Mat_VarCreate(NULL, MAT_C_CELL, MAT_T_CELL, 1, &dims, NULL, 0);
+	if (!*out)
+		return ENOMEM;
+
+	i = 0;
+	HASH_FOR(series1, series, hh) {
+		const char *fields[] = {
+			"series_id",
+			"tomogram",
+			"tomogram_slice_ids",
+			"fundi",
+		};
+		matvar_t *st, *id, *tomogram, *slice_ids;
+
+		st = create_struct(fields, COUNT(fields));
+		if (!st) {
+			rv = ENOMEM;
+			goto error;
+		}
+
+		id = create_int(&series1->id);
+		if (!id) {
+			rv = ENOMEM;
+			goto error_id;
+		}
+
+		Mat_VarSetStructFieldByName(st, "series_id", 0, id);
+
+		if (HASH_COUNT(series1->slices)) {
+			rv = export_tomogram(series1->slices, &tomogram, &slice_ids);
+			if (rv)
+				goto error_tomogram;
+
+			Mat_VarSetStructFieldByName(st, "tomogram", 0, tomogram);
+			Mat_VarSetStructFieldByName(st, "tomogram_slice_ids", 0,
+			                            slice_ids);
+		}
+		// TODO: export fundus images
+		
+		Mat_VarSetCell(*out, i++, st);
+		continue;
+
+	error_tomogram:
+		Mat_VarFree(id);
+	error_id:
+		Mat_VarFree(st);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	Mat_VarFree(*out);
+	return rv;
+}
+
+static int export_studies(const struct e2e_study *studies, matvar_t **out)
+{
+	int rv;
+	size_t i, dims;
+	const struct e2e_study *study;
+
+	dims = HASH_COUNT(studies);
+	*out = Mat_VarCreate(NULL, MAT_C_CELL, MAT_T_CELL, 1, &dims, NULL, 0);
+	if (!*out)
+		return ENOMEM;
+
+	i = 0;
+	HASH_FOR(study, studies, hh) {
+		const char *fields[] = {"study_id", "series"};
+		matvar_t *st, *id, *series;
+
+		st = create_struct(fields, COUNT(fields));
+		if (!st) {
+			rv = ENOMEM;
+			goto error;
+		}
+
+		id = create_int(&study->id);
+		if (!id) {
+			rv = ENOMEM;
+			goto error_id;
+		}
+
+		rv = export_series(studies->series, &series);
+		if (rv)
+			goto error_series;
+
+		Mat_VarSetStructFieldByName(st, "study_id", 0, id);
+		Mat_VarSetStructFieldByName(st, "series", 0, series);
+		Mat_VarSetCell(*out, i++, st);
+		continue;
+
+	error_series:
+		Mat_VarFree(id);
+	error_id:
+		Mat_VarFree(st);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	Mat_VarFree(*out);
+	return rv;
+}
+
+static int export_patients(const struct e2e_patient *patients, matvar_t **out)
+{
+	int rv;
+	size_t i, dims;
+	const struct e2e_patient *patient;
+
+	dims = HASH_COUNT(patients);
+	*out = Mat_VarCreate("patients", MAT_C_CELL, MAT_T_CELL, 1, &dims,
+	                     NULL, 0);
+	if (!*out)
+		return ENOMEM;
+
+	i = 0;
+	HASH_FOR(patient, patients, hh) {
+		const char *fields[] = {"patient_id", "studies"};
+		matvar_t *st, *id, *studies;
+
+		st = create_struct(fields, COUNT(fields));
+		if (!st) {
+			rv = ENOMEM;
+			goto error;
+		}
+
+		id = create_int(&patient->id);
+		if (!id) {
+			rv = ENOMEM;
+			goto error_id;
+		}
+
+		rv = export_studies(patients->studies, &studies);
+		if (rv)
+			goto error_studies;
+
+		Mat_VarSetStructFieldByName(st, "patient_id", 0, id);
+		Mat_VarSetStructFieldByName(st, "studies", 0, studies);
+		Mat_VarSetCell(*out, i++, st);
+		continue;
+
+	error_studies:
+		Mat_VarFree(id);
+	error_id:
+		Mat_VarFree(st);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	Mat_VarFree(*out);
+	return rv;
+}
+
+int export(const struct e2e_data *data, const char *path)
+{
+	int rv = 0;
+	mat_t *mat;
+	matvar_t *patients;
+
+	mat = Mat_Create(path, NULL);
+	if (!mat) {
+		errorf("error: couldn't open '%s' for writing\n", path);
+		return EIO;
+	}
+
+	rv = export_patients(data->patients, &patients);
+	if (!rv) {
+		Mat_VarWrite(mat, patients, MAT_COMPRESSION_ZLIB);
+		Mat_VarFree(patients);
+	}
+
+	Mat_Close(mat);
+	return rv;
+}
\ No newline at end of file
diff --git a/src/export.h b/src/export.h
new file mode 100644
index 0000000..1552396
--- /dev/null
+++ b/src/export.h
@@ -0,0 +1 @@
+int export(const struct e2e_data *data, const char *path);
diff --git a/src/main.c b/src/main.c
index 0242172..dcb5d06 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,4 @@
-#include <stdlib.h>
-#include <inttypes.h>
-#include <stdio.h>
-#include <errno.h>
+#include "common.h"
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -9,6 +6,7 @@
 #include <sys/mman.h>
 
 #include "e2e.h"
+#include "export.h"
 
 int main(int argc, char **argv)
 {
@@ -45,8 +43,11 @@ int main(int argc, char **argv)
 		goto error_mmap;
 	}
 
-	if (e2e_read(&data, input, input + st.st_size))
+	if (errno = e2e_read(&data, input, input + st.st_size))
 		perror("e2e_read");
+	else if (errno = export(&data, "testing.mat"))
+		perror("export");
+
 	e2e_destroy(&data);
 
 	munmap(input, st.st_size);