iff.h

// vim: set ft=cpp:

#ifndef ZTERP_IFF_H
#define ZTERP_IFF_H

#include <exception>
#include <memory>
#include <string>
#include <vector>

#include "io.h"
#include "types.h"

class IFF {
public:
    class TypeID {
    public:
        TypeID(unsigned char a, unsigned char b, unsigned char c, unsigned char d) :
            m_type((static_cast<uint32_t>(a) << 24) |
                   (static_cast<uint32_t>(b) << 16) |
                   (static_cast<uint32_t>(c) <<  8) |
                   (static_cast<uint32_t>(d) <<  0)) {
        }

        TypeID() : m_type(0) {
        }

        explicit TypeID(uint32_t type) : m_type(type) {
        }

        explicit TypeID(const char (*type)[5]) : TypeID((*type)[0], (*type)[1], (*type)[2], (*type)[3]) {
        }

        uint32_t val() const {
            return m_type;
        }

        std::string name() const {
            std::string name;

            name.push_back((m_type >> 24) & 0xff);
            name.push_back((m_type >> 16) & 0xff);
            name.push_back((m_type >>  8) & 0xff);
            name.push_back((m_type >>  0) & 0xff);

            return name;
        }

        bool empty() const {
            return m_type == 0;
        }

        bool operator==(const TypeID &rhs) const {
            return val() == rhs.val();
        }

        bool operator!=(const TypeID &rhs) const {
            return !operator==(rhs);
        }

    private:
        uint32_t m_type;
    };

    struct Entry {
        Entry(TypeID type_, long offset_, uint32_t size_) :
            type(type_), offset(offset_), size(size_) {
        }
        TypeID type;
        long offset;
        uint32_t size;
    };

    class InvalidFile : std::exception {
    };

    IFF(std::shared_ptr<IO> io, TypeID type);
    bool find(TypeID type, uint32_t &size);

    std::shared_ptr<IO> io() {
        return m_io;
    }

private:
    std::shared_ptr<IO> m_io;
    std::vector<Entry> m_entries;
};

#endif