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122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file cpr/flate.h
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*
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* Compressor DEFLATE and inflate stream implementation.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*
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* \see [RFC 1950](https://tools.ietf.org/html/rfc1950)
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* \see [RFC 1951](https://tools.ietf.org/html/rfc1951)
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* \see [RFC 1952](https://tools.ietf.org/html/rfc1952)
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*/
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#ifndef DF_CPR_FLATE_H_
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#define DF_CPR_FLATE_H_
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#include "stm.h"
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/// DEFLATE or inflate stream handle.
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typedef struct ZlibStmObj *ZlibStmHn;
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/// Supported DEFLATE data formats.
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typedef enum {
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ZFMT_RFC1952, ///< gzip compression, see [RFC 1952](https://tools.ietf.org/html/rfc1952)
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ZFMT_RFC1951, ///< Original deflate format, see [RFC 1951](https://tools.ietf.org/html/rfc1951)
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ZFMT_RFC1950 ///< Zlib format, see [RFC 1950](https://tools.ietf.org/html/rfc1950)
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} Zlibfmt;
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/// Inflate (decompression) options.
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typedef struct {
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unsigned win_bits; ///< Compression window size in bits
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Zlibfmt format; ///< Input DEFLATE encoding format
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size_t bufsiz; ///< Input buffer size in bytes, 0 for default
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} InflateOpts;
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/// DEFLATE (compression) options.
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typedef struct {
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int compression; ///< Compression, range `[0-9]` (0 = none, 9 = best)
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unsigned win_bits; ///< Compression window size in bits
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Zlibfmt format; ///< Output DEFLATE format
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size_t bufsiz; ///< Output buffer size in bytes, leave to 0 for default
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} DeflateOpts;
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/// Zlib result status.
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typedef Sint64 ZlibRet; // 0 == OK
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/**
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* \brief Implementation of the `StmOps` interface for DEFLATE streams.
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*
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* Passing these interfaces to any API working with streams allows it to
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* operate on DEFLATE streams.
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* `Zlib_StmOps` implements the `Close()` method, while the non-closing
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* `Zlib_NcStmOps` leaves `Close()` to `NULL`, effectively preventing any
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* attempt to close such stream. Use this variant when this behavior is
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* desirable (e.g. streams similar to `stdout` or `stdin`).
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*
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* @{
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* \var Zlib_StmOps
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* \var Zlib_NcStmOps
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* @}
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*/
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extern const StmOps *const Zlib_StmOps;
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extern const StmOps *const Zlib_NcStmOps;
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/// Return last Zlib operation's return status.
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ZlibRet Zlib_GetErrStat(void);
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/// Convert `ZlibRet` result to human readable string.
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const char *Zlib_ErrorString(ZlibRet res);
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/**
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* \brief Start Zlib decompression over a stream.
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*
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* \param [in,out] streamp Compressed input source stream
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* \param [in] ops Read operations over `streamp`, must not be `NULL` and provide `Read()`
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* \param [in] opts Decompression options, `NULL` for defaults
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*
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* \return Opened Zlib handle on success, `NULL` on failure.
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*/
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ZlibStmHn Zlib_InflateOpen(void *streamp, const StmOps *ops, const InflateOpts *opts);
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/**
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* \brief Start Zlib compression over a stream.
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*
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* \param [in,out] streamp Destination for compressed output
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* \param [in] ops Write operations over `ßtreamp`, must not be `NULL` and provide `Write()`
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* \param [in] opts Compression options, `NULL` for defaults.
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*
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* \return Opened Zlib handle on success, `NULL` on failure.
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*/
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ZlibStmHn Zlib_DeflateOpen(void *streamp, const StmOps *ops, const DeflateOpts *opts);
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/**
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* \brief Decompress `nbytes` bytes from `hn` into `buf`.
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*
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* \return Number of bytes actually written to `buf`, at most `nbytes`,
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* 0 on end of stream, -1 on error.
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*/
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Sint64 Zlib_Read(ZlibStmHn hn, void *buf, size_t nbytes);
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/**
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* \brief Compresses `nbytes` bytes from `buf` to `hn`.
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*
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* \return Count of bytes actually compressed to `hn`, at most `nbytes`,
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* -1 on error.
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*
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* \note Compression should be finalized with `Zlib_Finish()` once all
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* data is written.
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*/
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Sint64 Zlib_Write(ZlibStmHn hn, const void *buf, size_t nbytes);
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/**
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* \brief Finalize DEFLATE compression.
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*
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* \return `OK` on success, `NG` otherwise.
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*/
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Judgement Zlib_Finish(ZlibStmHn hn);
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/// Close Zlib stream handle.
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void Zlib_Close(ZlibStmHn hn);
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#endif
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