1 files changed, 68 insertions, 0 deletions
diff --git a/g-ir-extract-deps.c b/g-ir-extract-deps.c
new file mode 100644
index 0000000..1c1735d
--- /dev/null
+++ b/g-ir-extract-deps.c
@@ -0,0 +1,68 @@
+/*
+	extract the dependencies string from a GObject Introspection 1.0 typelib file
+	and print it on stdout
+*/
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#define G_IR_MAGIC "GOBJ\nMETADATA\r\n\032"
+
+int main(int argc, char ** argv)
+{
+	FILE *		typelib;
+	char *		magic;
+	uint32_t	deps_offset;
+	char *		deps;
+
+	if (argc < 2)
+	{
+		fprintf(stderr, "too few arguments\n");
+		exit(1);
+	}
+	
+	typelib = fopen(argv[1], "r");
+	if (typelib == NULL)
+	{
+		fprintf(stderr, "failed to open %s\n", argv[1]);
+		exit(1);
+	}
+	magic = malloc(16);
+	deps = malloc(8192);
+	if ((magic == NULL) || (deps == NULL))
+	{
+		fprintf(stderr, "failed to allocate memory\n");
+		exit(1);
+	}
+	if (fread(magic, 16, 1, typelib) < 1)
+	{
+		fprintf(stderr, "failed to read magic from typelib\n");
+		exit(1);
+	}
+	if (strcmp(magic, G_IR_MAGIC))
+	{
+		fprintf(stderr, "magic mismatch, not a typelib?\n");
+		exit(1);
+	}
+
+	fseek(typelib, 36, SEEK_SET);
+	if (fread(&deps_offset, 4, 1, typelib) < 1)
+	{
+		fprintf(stderr, "failed to read deps offset from typelib\n");
+		exit(1);
+	}
+	fseek(typelib, deps_offset, SEEK_SET);
+	if (fscanf(typelib, "%8191s", deps) < 1)
+	{
+		fprintf(stderr, "failed to read deps from typelib\n");
+		exit(1);
+	}
+
+	free(deps);
+	free(magic);
+	fclose(typelib);
+
+	printf("%s\n", deps);
+	return 0;
+}