#ifndef ZYB_HEADERS_H
#define ZYB_HEADERS_H

// libc
#include <sys/types.h>

#define ZYB_MAGIC "ZYB\0"
#define ZYB_DEP_MAGIC "DEP\0"
#define ZYB_FILE_MAGIC "ZIP\0"
#define ZYB_FORMAT_VER 1
#define ZYB_NAME_LENGTH 100

/*
 * This struct is the very first thing in any .zyb file.
 * It contains package metadata, such as the name and dependencies.
 */
struct __attribute__((__packed__, aligned(2))) zyb_header {
	/*
	 * This struct is the first part of the header,
	 * containing critical information about the package.
	 */
	struct __attribute__((__packed__, aligned(2))) lead {
		char magic[4];				// Magic (ZYB_MAGIC)
		unsigned short version;			// Format version (ZYB_FORMAT_VER)
		char arch[6];				// Magic identifying arch
		char os[6];				// Magic identifying os
		char name[ZYB_NAME_LENGTH];		// Name of the package
		unsigned short major, minor, patch;	// SemVer
		unsigned short dependencies;		// Number of dependencies
		unsigned char reserved[2];		// Padding
	} leader;
	/*
	 * This struct contains information about each dependency.
	 * The number of these struct should EXACTLY be lead.dependencies.
	 */
	struct __attribute__((__packed__, aligned(2))) dependency {
		char magic[4];				// Magic (ZYB_DEP_MAGIC)
		char name[ZYB_NAME_LENGTH];		// Name of the dependency
		unsigned short major, minor, patch;	// Minimum SemVer
		unsigned char reserved[2];		// Padding
	} dependencies[0];
};

/*
 * This struct appends every single file in the .zyb.
 * It contains metadata for the individual files in the package.
 * WARNING: CHECKSUM IS FOR THE UNZIPPED FILE.
 */
struct __attribute__((__packed__, aligned(2))) zyb_file_header {
	char magic[4];					// Magic (ZYB_FILE_MAGIC)
	char *path;					// Destination path of the file
	mode_t permissions;				// UNIX permission attributes (32 bits)
	off_t length;					// File length (64 bits)
	unsigned char checksum[32];			// Checksum of the unzipped file
	unsigned char reserved[2];			// Padding
};

#endif