assimp/code/Common/Compression.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2022, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms,
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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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* Neither the name of the assimp team, nor the names of its
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  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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*/

#pragma once

#include "zlib.h"

#include <vector>
#include <cstddef> // size_t

namespace Assimp {

/// @brief This class provides the decompression of zlib-compressed data.
class Compression {
public:
    static const int MaxWBits = MAX_WBITS;

    /// @brief Describes the format data type
    enum class Format {
        InvalidFormat = -1, ///< Invalid enum type.
        Binary = 0,         ///< Binary format.
        ASCII,              ///< ASCII format.

        NumFormats          ///< The number of supported formats.
    };

    /// @brief The supported flush mode, used for blocked access.
    enum class FlushMode {
        InvalidFormat = -1, ///< Invalid enum type.
        NoFlush = 0,        ///< No flush, will be done on inflate end.
        Block,              ///< Assists in combination of compress.
        Tree,               ///< Assists in combination of compress and returns if stream is finish.
        SyncFlush,          ///< Synced flush mode.
        Finish,             ///< Finish mode, all in once, no block access.

        NumModes            ///< The number of supported modes.
    };

    /// @brief  The class constructor.
    Compression();

    ///	@brief  The class destructor.
    ~Compression();

    /// @brief  Will open the access to the compression.
    /// @param[in] format       The format type
    /// @param[in] flush        The flush mode.
    /// @param[in] windowBits   The windows history working size, shall be between 8 and 15.
    /// @return true if close was successful, false if not.
    bool open(Format format, FlushMode flush, int windowBits);

    /// @brief  Will return the open state.
    /// @return true if the access is opened, false if not.
    bool isOpen() const;

    /// @brief  Will close the decompress access.
    /// @return true if close was successful, false if not.
    bool close();

    /// @brief Will decompress the data buffer in one step.
    /// @param[in] data         The data to decompress
    /// @param[in] in           The size of the data.
    /// @param[out uncompressed A std::vector containing the decompressed data.
    size_t decompress(const void *data, size_t in, std::vector<char> &uncompressed);

    /// @brief Will decompress the data buffer block-wise.
    /// @param[in]  data         The compressed data
    /// @param[in]  in           The size of the data buffer
    /// @param[out] out          The output buffer
    /// @param[out] availableOut The upper limit of the output buffer.
    /// @return The size of the decompressed data buffer.
    size_t decompressBlock(const void *data, size_t in, char *out, size_t availableOut);

private:
    struct impl;
    impl *mImpl;
};

} // namespace Assimp