Current File : //usr/include/freetype2/freetype/ftgzip.h
/***************************************************************************/
/* */
/* ftgzip.h */
/* */
/* Gzip-compressed stream support. */
/* */
/* Copyright 2002-2018 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#ifndef FTGZIP_H_
#define FTGZIP_H_
#include <ft2build.h>
#include FT_FREETYPE_H
#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Section> */
/* gzip */
/* */
/* <Title> */
/* GZIP Streams */
/* */
/* <Abstract> */
/* Using gzip-compressed font files. */
/* */
/* <Description> */
/* This section contains the declaration of Gzip-specific functions. */
/* */
/*************************************************************************/
/************************************************************************
*
* @function:
* FT_Stream_OpenGzip
*
* @description:
* Open a new stream to parse gzip-compressed font files. This is
* mainly used to support the compressed `*.pcf.gz' fonts that come
* with XFree86.
*
* @input:
* stream ::
* The target embedding stream.
*
* source ::
* The source stream.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* The source stream must be opened _before_ calling this function.
*
* Calling the internal function `FT_Stream_Close' on the new stream will
* *not* call `FT_Stream_Close' on the source stream. None of the stream
* objects will be released to the heap.
*
* The stream implementation is very basic and resets the decompression
* process each time seeking backwards is needed within the stream.
*
* In certain builds of the library, gzip compression recognition is
* automatically handled when calling @FT_New_Face or @FT_Open_Face.
* This means that if no font driver is capable of handling the raw
* compressed file, the library will try to open a gzipped stream from
* it and re-open the face with it.
*
* This function may return `FT_Err_Unimplemented_Feature' if your build
* of FreeType was not compiled with zlib support.
*/
FT_EXPORT( FT_Error )
FT_Stream_OpenGzip( FT_Stream stream,
FT_Stream source );
/************************************************************************
*
* @function:
* FT_Gzip_Uncompress
*
* @description:
* Decompress a zipped input buffer into an output buffer. This function
* is modeled after zlib's `uncompress' function.
*
* @input:
* memory ::
* A FreeType memory handle.
*
* input ::
* The input buffer.
*
* input_len ::
* The length of the input buffer.
*
* @output:
* output::
* The output buffer.
*
* @inout:
* output_len ::
* Before calling the function, this is the total size of the output
* buffer, which must be large enough to hold the entire uncompressed
* data (so the size of the uncompressed data must be known in
* advance). After calling the function, `output_len' is the size of
* the used data in `output'.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* This function may return `FT_Err_Unimplemented_Feature' if your build
* of FreeType was not compiled with zlib support.
*
* @since:
* 2.5.1
*/
FT_EXPORT( FT_Error )
FT_Gzip_Uncompress( FT_Memory memory,
FT_Byte* output,
FT_ULong* output_len,
const FT_Byte* input,
FT_ULong input_len );
/* */
FT_END_HEADER
#endif /* FTGZIP_H_ */
/* END */
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