Add "native" Suunto SDE zip file reading

You need to have libzip-devel installed, and pkg-config needs to know about it
for the build to pick up on it.

On at least Fedora, a simple "yum install libzip-devel" will make things
work, although you may need to force a rebuild of subsurface too (the
"file.o" file in particular - the Makefile doesn't track system
dependencies).

Then, you can just do

   subsurface my-dives.SDE

to read the data directly from the SDE file.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 62 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 39e1cadb0..265f8fe4e 100644
--- a/Makefile
+++ b/Makefile
@@ -87,6 +87,11 @@ GLIB2CFLAGS = $(shell $(PKGCONFIG) --cflags glib-2.0)
 GTK2CFLAGS = $(shell $(PKGCONFIG) --cflags gtk+-2.0)
 CFLAGS += $(shell $(XSLCONFIG) --cflags)
 
+LIBZIP = $(shell $(PKGCONFIG) --libs libzip 2> /dev/null)
+ifneq ($(strip $(LIBZIP)),)
+	ZIP = -DLIBZIP $(shell $(PKGCONFIG) --cflags libzip)
+endif
+
 ifeq ($(UNAME), linux)
 	LIBGCONF2 = $(shell $(PKGCONFIG) --libs gconf-2.0)
 	GCONF2CFLAGS =  $(shell $(PKGCONFIG) --cflags gconf-2.0)
@@ -111,7 +116,7 @@ ifneq ($(strip $(LIBXSLT)),)
 	endif
 endif
 
-LIBS = $(LIBXML2) $(LIBXSLT) $(LIBGTK) $(LIBGCONF2) $(LIBDIVECOMPUTER) $(EXTRALIBS) -lpthread -lm
+LIBS = $(LIBXML2) $(LIBXSLT) $(LIBGTK) $(LIBGCONF2) $(LIBDIVECOMPUTER) $(EXTRALIBS) $(LIBZIP) -lpthread -lm
 
 OBJS =	main.o dive.o profile.o info.o equipment.o divelist.o \
 	parse-xml.o save-xml.o libdivecomputer.o print.o uemis.o \
@@ -148,7 +153,7 @@ install-macosx: $(NAME)
 	$(INSTALL) $(MACOSXFILES)/Subsurface.icns $(MACOSXINSTALL)/Contents/Resources/
 
 file.o: file.c dive.h
-	$(CC) $(CFLAGS) $(GLIB2CFLAGS) $(XML2CFLAGS) $(XSLT) -c file.c
+	$(CC) $(CFLAGS) $(GLIB2CFLAGS) $(XML2CFLAGS) $(XSLT) $(ZIP) -c file.c
 
 parse-xml.o: parse-xml.c dive.h
 	$(CC) $(CFLAGS) $(GLIB2CFLAGS) $(XML2CFLAGS) $(XSLT) -c parse-xml.c
diff --git a/file.c b/file.c
index 5db36a849..26b89a623 100644
--- a/file.c
+++ b/file.c
@@ -2,6 +2,7 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 #include "dive.h"
@@ -53,10 +54,64 @@ out:
 	return ret;
 }
 
+#ifdef LIBZIP
+#include <zip.h>
+
+static void suunto_read(struct zip_file *file, GError **error)
+{
+	int size = 1024, n, read = 0;
+	char *mem = malloc(size);
+
+	while ((n = zip_fread(file, mem+read, size-read)) > 0) {
+		read += n;
+		size = read * 3 / 2;
+		mem = realloc(mem, size);
+	}
+	parse_xml_buffer("SDE file", mem, read, error);
+	free(mem);
+}
+#endif
+
+static int try_to_open_suundo(const char *filename, GError **error)
+{
+	int success = 0;
+#ifdef LIBZIP
+	struct zip *zip = zip_open(filename, ZIP_CHECKCONS, NULL);
+
+	if (zip) {
+		int index;
+		for (index = 0; ;index++) {
+			struct zip_file *file = zip_fopen_index(zip, index, 0);
+			if (!file)
+				break;
+			suunto_read(file, error);
+			zip_fclose(file);
+			success++;
+		}
+		zip_close(zip);
+	}
+#endif
+	return success;
+}
+
+static int open_by_filename(const char *filename, const char *fmt, GError **error)
+{
+	/* Suunto Dive Manager files: SDE */
+	if (!strcasecmp(fmt, "SDE"))
+		return try_to_open_suundo(filename, error);
+
+	return 0;
+}
+
 void parse_file(const char *filename, GError **error)
 {
+	char *fmt;
 	struct memblock mem;
 
+	fmt = strrchr(filename, '.');
+	if (fmt && open_by_filename(filename, fmt+1, error))
+		return;
+
 	if (readfile(filename, &mem) < 0) {
 		fprintf(stderr, "Failed to read '%s'.\n", filename);
 		if (error) {