149 lines
5.5 KiB
C
149 lines
5.5 KiB
C
/***************************************************************************/
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/* */
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/* ftgzip.h */
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/* */
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/* Gzip-compressed stream support. */
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/* */
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/* Copyright 2002-2016 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef FTGZIP_H_
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#define FTGZIP_H_
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#ifdef FREETYPE_H
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#error "freetype.h of FreeType 1 has been loaded!"
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#error "Please fix the directory search order for header files"
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#error "so that freetype.h of FreeType 2 is found first."
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#endif
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* <Section> */
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/* gzip */
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/* */
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/* <Title> */
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/* GZIP Streams */
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/* */
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/* <Abstract> */
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/* Using gzip-compressed font files. */
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/* */
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/* <Description> */
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/* This section contains the declaration of Gzip-specific functions. */
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/* */
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/*************************************************************************/
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/************************************************************************
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*
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* @function:
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* FT_Stream_OpenGzip
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*
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* @description:
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* Open a new stream to parse gzip-compressed font files. This is
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* mainly used to support the compressed `*.pcf.gz' fonts that come
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* with XFree86.
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*
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* @input:
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* stream ::
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* The target embedding stream.
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*
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* source ::
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* The source stream.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* The source stream must be opened _before_ calling this function.
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*
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* Calling the internal function `FT_Stream_Close' on the new stream will
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* *not* call `FT_Stream_Close' on the source stream. None of the stream
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* objects will be released to the heap.
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*
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* The stream implementation is very basic and resets the decompression
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* process each time seeking backwards is needed within the stream.
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*
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* In certain builds of the library, gzip compression recognition is
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* automatically handled when calling @FT_New_Face or @FT_Open_Face.
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* This means that if no font driver is capable of handling the raw
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* compressed file, the library will try to open a gzipped stream from
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* it and re-open the face with it.
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*
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* This function may return `FT_Err_Unimplemented_Feature' if your build
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* of FreeType was not compiled with zlib support.
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*/
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FT_EXPORT( FT_Error )
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FT_Stream_OpenGzip( FT_Stream stream,
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FT_Stream source );
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/************************************************************************
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*
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* @function:
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* FT_Gzip_Uncompress
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*
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* @description:
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* Decompress a zipped input buffer into an output buffer. This function
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* is modeled after zlib's `uncompress' function.
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*
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* @input:
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* memory ::
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* A FreeType memory handle.
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*
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* input ::
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* The input buffer.
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*
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* input_len ::
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* The length of the input buffer.
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*
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* @output:
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* output::
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* The output buffer.
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*
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* @inout:
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* output_len ::
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* Before calling the function, this is the the total size of the
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* output buffer, which must be large enough to hold the entire
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* uncompressed data (so the size of the uncompressed data must be
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* known in advance). After calling the function, `output_len' is the
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* size of the used data in `output'.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* This function may return `FT_Err_Unimplemented_Feature' if your build
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* of FreeType was not compiled with zlib support.
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*/
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FT_EXPORT( FT_Error )
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FT_Gzip_Uncompress( FT_Memory memory,
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FT_Byte* output,
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FT_ULong* output_len,
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const FT_Byte* input,
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FT_ULong input_len );
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/* */
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FT_END_HEADER
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#endif /* FTGZIP_H_ */
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/* END */
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