152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
/****************************************************************************
|
|
*
|
|
* ftgzip.h
|
|
*
|
|
* Gzip-compressed stream support.
|
|
*
|
|
* Copyright (C) 2002-2022 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 <freetype/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:
|
|
* 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.
|
|
*
|
|
* The stream implementation is very basic and resets the decompression
|
|
* process each time seeking backwards is needed within the stream,
|
|
* which significantly undermines the performance.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 */
|