/*
	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);
	}
	if (deps_offset > 0)
	{
		fseek(typelib, deps_offset, SEEK_SET);
		if (fscanf(typelib, "%8191s", deps) < 1)
		{
			fprintf(stderr, "failed to read deps from typelib\n");
			exit(1);
		}

		printf("%s\n", deps);
	}
	
	free(deps);
	free(magic);
	fclose(typelib);

	return 0;
}