zipFile.h

//
// Copyright 2018 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_USD_SDF_ZIP_FILE_H
#define PXR_USD_SDF_ZIP_FILE_H
 
#include "pxr/pxr.h"
#include "pxr/usd/sdf/api.h"
 
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
#include <vector>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class ArAsset;
 
class SdfZipFile
{
private:
    class _Impl;
 
public:
    SDF_API
    static SdfZipFile Open(const std::string& filePath);
 
    SDF_API
    static SdfZipFile Open(const std::shared_ptr<ArAsset>& asset);
 
    SDF_API
    SdfZipFile();
 
    SDF_API
    ~SdfZipFile();
 
    SDF_API
    explicit operator bool() const { return static_cast<bool>(_impl); }
 
    class FileInfo
    {
    public:
        size_t dataOffset = 0;
 
        size_t size = 0;
 
        size_t uncompressedSize = 0;
 
        size_t crc = 0;
 
        uint16_t compressionMethod = 0;
 
        bool encrypted = false;
    };
 
    class Iterator 
    {
        // Proxy type for operator->(), needed since this iterator's value
        // is generated on the fly.
        class _ArrowProxy
        {
        public:
            explicit _ArrowProxy(const std::string& s) : _s(s) { }
            const std::string* operator->() const { return &_s; }
        private:
            std::string _s;
        };
 
    public:
        SDF_API
        Iterator();
 
        SDF_API
        ~Iterator();
 
        SDF_API
        Iterator(const Iterator& rhs);
 
        SDF_API
        Iterator(Iterator&& rhs);
 
        SDF_API
        Iterator& operator=(const Iterator& rhs);
 
        SDF_API
        Iterator& operator=(Iterator&& rhs);
 
        using difference_type = std::ptrdiff_t;
        using value_type = std::string;
        using pointer = _ArrowProxy;
        using reference = std::string;
        using iterator_category = std::forward_iterator_tag;
 
        SDF_API
        Iterator& operator++();
        SDF_API
        Iterator operator++(int);
 
        SDF_API
        bool operator==(const Iterator& rhs) const;
        SDF_API
        bool operator!=(const Iterator& rhs) const;
 
        SDF_API
        reference operator*() const;
 
        SDF_API
        pointer operator->() const;
 
        SDF_API
        const char* GetFile() const;
 
        SDF_API
        FileInfo GetFileInfo() const;
 
    private:
        friend class SdfZipFile;
        Iterator(const _Impl* impl, size_t offset = 0);
 
        class _IteratorData;
        std::unique_ptr<_IteratorData> _data;
    };
 
    SDF_API
    Iterator begin() const;
 
    Iterator cbegin() const { return begin(); }
 
    SDF_API
    Iterator end() const;
 
    Iterator cend() const { return end(); }
 
    SDF_API
    Iterator Find(const std::string& path) const;
 
    SDF_API
    void DumpContents() const;
 
private:
    SdfZipFile(std::shared_ptr<_Impl>&& impl);
 
    std::shared_ptr<_Impl> _impl;
};
 
class SdfZipFileWriter
{
public:
    SDF_API
    static SdfZipFileWriter CreateNew(const std::string& filePath);
 
    SDF_API
    SdfZipFileWriter();
 
    SDF_API
    ~SdfZipFileWriter();
 
    SdfZipFileWriter(const SdfZipFileWriter&) = delete;
    SdfZipFileWriter& operator=(const SdfZipFileWriter&) = delete;
 
    SDF_API
    SdfZipFileWriter(SdfZipFileWriter&& rhs);
    SDF_API
    SdfZipFileWriter& operator=(SdfZipFileWriter&& rhs);
 
    SDF_API
    explicit operator bool() const { return static_cast<bool>(_impl); }
 
    SDF_API
    std::string AddFile(const std::string& filePath,
                        const std::string& filePathInArchive = std::string());
 
    SDF_API
    bool Save();
 
    SDF_API
    void Discard();
 
private:
    class _Impl;
    SdfZipFileWriter(std::unique_ptr<_Impl>&& impl);
 
    std::unique_ptr<_Impl> _impl;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_USD_SDF_ZIP_FILE_H