fpack.h

#ifndef fpack_h
#define fpack_h

#include <stdint.h>

#ifndef _MSC_VER
#define PACKED __attribute__((packed))
#else
#pragma pack(push, 1)
#define PACKED
#endif

typedef struct {
    char signature[4];      // 'FPAK'
    uint32_t files_count;   // Number of files in the archive
} PACKED fpack_header_t;

typedef struct {
    char filename[16];      // Filename (null-terminated, max 15 chars + null terminator)
    uint32_t offset;        // Offset in the archive where the file data starts
    uint32_t size;          // Size of the file data, if compressed, this is the compressed size
    // decompressed size can be derived from the first 4 bytes of the file data
} PACKED fpack_file_entry_t;

#ifdef _MSC_VER
#pragma pack(pop)
#endif

#endif // fpack.h