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# FreeType-2.5.1 API Reference

# GZIP Streams

## Synopsis

| FT_Stream_OpenGzip |  | FT_Gzip_Uncompress |  |

This section contains the declaration of Gzip-specific functions.

#### FT_Stream_OpenGzip
Defined in FT_GZIP_H (ftgzip.h).
      FT_EXPORT( FT_Error )
      FT_Stream_OpenGzip( FT_Stream  stream,
                          FT_Stream  source );
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.

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#### FT_Gzip_Uncompress
Defined in FT_GZIP_H (ftgzip.h).
      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 );
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 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.

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