Add svgstat utility

Makefile

@@ -1,38 +1,46 @@
 RM      := rm -f
 CFLAGS  := -O3 -Wall -Isrc -I/usr/include/ffmpeg
-LIBS    := -lavformat -lavutil -lavcodec -lswscale
+LIBS    := -lavformat -lavutil -lavcodec -lswscale -lrsvg-2
 LDFLAGS :=
 INSTALL ?= install
 PREFIX  ?= /usr/local
 
 COMMON_OBJECTS     := build/validation.o build/png.o build/util.o
 MEDIASTAT_OBJECTS  := build/stat.o
+SVGSTAT_OBJECTS    := build/svgstat.o
 MEDIATHUMB_OBJECTS := build/thumb.o
 
 # Phony rules
 .PHONY: all mediastat clean
 
-all: mediastat mediathumb
+all: mediastat svgstat mediathumb
 
 install: all
 	$(INSTALL) build/mediastat $(PREFIX)/bin/mediastat
+	$(INSTALL) build/svgstat $(PREFIX)/bin/svgstat
 	$(INSTALL) build/mediathumb $(PREFIX)/bin/mediathumb
 
 uninstall:
 	$(RM) -rf $(PREFIX)/bin/mediastat
+	$(RM) -rf $(PREFIX)/bin/svgstat
 	$(RM) -rf $(PREFIX)/bin/mediathumb
 
 mediastat: build/mediastat
 
+svgstat: build/svgstat
+
 mediathumb: build/mediathumb
 
 clean:
-	$(RM) $(COMMON_OBJECTS) $(MEDIASTAT_OBJECTS)$(MEDIATHUMB_OBJECTS)
+	$(RM) $(COMMON_OBJECTS) $(MEDIASTAT_OBJECTS) $(SVGSTAT_OBJECTS) $(MEDIATHUMB_OBJECTS)
 
 # Build rules
 build/mediastat: $(COMMON_OBJECTS) $(MEDIASTAT_OBJECTS)
 	$(CC) $^ $(LDFLAGS) $(LIBS) -o $@
 
+build/svgstat: $(COMMON_OBJECTS) $(SVGSTAT_OBJECTS)
+	$(CC) $^ $(LDFLAGS) $(LIBS) -o $@
+
 build/mediathumb: $(COMMON_OBJECTS) $(MEDIATHUMB_OBJECTS)
 	$(CC) $^ $(LDFLAGS) $(LIBS) -o $@
 
@@ -42,3 +50,4 @@ build/%.o: src/%.c
 # Declare dependencies
 -include $(COMMON_OBJECTS:.o=.d)
 -include $(MEDIASTAT_OBJECTS:.o=.d)
+-include $(SVGSTAT_OBJECTS:.o=.d)

src/svgstat.c

@@ -0,0 +1,68 @@
+#include <stdio.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "validation.h"
+#include "util.h"
+
+typedef struct RsvgHandle RsvgHandle;
+typedef struct RsvgDimensionData {
+    int width;
+    int height;
+    double em;
+    double ex;
+} RsvgDimensionData;
+
+extern RsvgHandle *
+rsvg_handle_new_from_file(const char *file_name, void **error);
+
+extern void
+rsvg_handle_get_dimensions(RsvgHandle *handle, RsvgDimensionData *dimension_data);
+
+// SVG is a special snowflake format that needs different treatment.
+//
+// Other tools will try to actually render the file just to get
+// the dimensions. librsvg allows getting the dimensions without
+// rendering, which important because the stat tools should run
+// quickly.
+
+int main(int argc, char *argv[])
+{
+    RsvgHandle *handle;
+    RsvgDimensionData dimensions;
+    struct stat statbuf;
+
+    if (argc != 2) {
+        printf("No input specified\n");
+        return -1;
+    }
+
+    if (stat(argv[1], &statbuf) != 0) {
+        printf("Couldn't read file\n");
+        return -1;
+    }
+
+    handle = rsvg_handle_new_from_file(argv[1], NULL);
+    if (handle == NULL) {
+        printf("Couldn't read file\n");
+        return -1;
+    }
+
+    rsvg_handle_get_dimensions(handle, &dimensions);
+
+    if (dimensions.width < 1 || dimensions.width > 32767) {
+        printf("Invalid width %d\n", dimensions.width);
+        return -1;
+    }
+
+    if (dimensions.height < 1 || dimensions.height > 32767) {
+        printf("Invalid height %d\n", dimensions.height);
+        return -1;
+    }
+
+    printf("%ld %lu %d %d %d %d\n", statbuf.st_size, 1ul, dimensions.width, dimensions.height, 1, 25);
+
+    return 0;
+}