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ftrfork.h

/***************************************************************************/
/*                                                                         */
/*  ftrfork.h                                                              */
/*                                                                         */
/*    Embedded resource forks accessor (specification).                    */
/*                                                                         */
/*  Copyright 2004, 2006, 2007 by                                          */
/*  Masatake YAMATO and Redhat K.K.                                        */
/*                                                                         */
/*  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.                                        */
/*                                                                         */
/***************************************************************************/

/***************************************************************************/
/* Development of the code in this file is support of                      */
/* Information-technology Promotion Agency, Japan.                         */
/***************************************************************************/


#ifndef __FTRFORK_H__
#define __FTRFORK_H__


#include <ft2build.h>
#include FT_INTERNAL_OBJECTS_H


FT_BEGIN_HEADER


  /* Number of guessing rules supported in `FT_Raccess_Guess'.            */
  /* Don't forget to increment the number if you add a new guessing rule. */
#define FT_RACCESS_N_RULES  9


  /* A structure to describe a reference in a resource by its resource ID */
  /* and internal offset.  The `POST' resource expects to be concatenated */
  /* by the order of resource IDs instead of its appearance in the file.  */

  typedef struct  FT_RFork_Ref_
  {
    FT_UShort  res_id;
    FT_ULong   offset;

  } FT_RFork_Ref;


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Raccess_Guess                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Guess a file name and offset where the actual resource fork is     */
  /*    stored.  The macro FT_RACCESS_N_RULES holds the number of          */
  /*    guessing rules;  the guessed result for the Nth rule is            */
  /*    represented as a triplet: a new file name (new_names[N]), a file   */
  /*    offset (offsets[N]), and an error code (errors[N]).                */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library ::                                                         */
  /*      A FreeType library instance.                                     */
  /*                                                                       */
  /*    stream ::                                                          */
  /*      A file stream containing the resource fork.                      */
  /*                                                                       */
  /*    base_name ::                                                       */
  /*      The (base) file name of the resource fork used for some          */
  /*      guessing rules.                                                  */
  /*                                                                       */
  /* <Output>                                                              */
  /*    new_names ::                                                       */
  /*      An array of guessed file names in which the resource forks may   */
  /*      exist.  If `new_names[N]' is NULL, the guessed file name is      */
  /*      equal to `base_name'.                                            */
  /*                                                                       */
  /*    offsets ::                                                         */
  /*      An array of guessed file offsets.  `offsets[N]' holds the file   */
  /*      offset of the possible start of the resource fork in file        */
  /*      `new_names[N]'.                                                  */
  /*                                                                       */
  /*    errors ::                                                          */
  /*      An array of FreeType error codes.  `errors[N]' is the error      */
  /*      code of Nth guessing rule function.  If `errors[N]' is not       */
  /*      FT_Err_Ok, `new_names[N]' and `offsets[N]' are meaningless.      */
  /*                                                                       */
  FT_BASE( void )
  FT_Raccess_Guess( FT_Library  library,
                    FT_Stream   stream,
                    char*       base_name,
                    char**      new_names,
                    FT_Long*    offsets,
                    FT_Error*   errors );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Raccess_Get_HeaderInfo                                          */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Get the information from the header of resource fork.  The         */
  /*    information includes the file offset where the resource map        */
  /*    starts, and the file offset where the resource data starts.        */
  /*    `FT_Raccess_Get_DataOffsets' requires these two data.              */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library ::                                                         */
  /*      A FreeType library instance.                                     */
  /*                                                                       */
  /*    stream ::                                                          */
  /*      A file stream containing the resource fork.                      */
  /*                                                                       */
  /*    rfork_offset ::                                                    */
  /*      The file offset where the resource fork starts.                  */
  /*                                                                       */
  /* <Output>                                                              */
  /*    map_offset ::                                                      */
  /*      The file offset where the resource map starts.                   */
  /*                                                                       */
  /*    rdata_pos ::                                                       */
  /*      The file offset where the resource data starts.                  */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  FT_Err_Ok means success.                     */
  /*                                                                       */
  FT_BASE( FT_Error )
  FT_Raccess_Get_HeaderInfo( FT_Library  library,
                             FT_Stream   stream,
                             FT_Long     rfork_offset,
                             FT_Long    *map_offset,
                             FT_Long    *rdata_pos );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Raccess_Get_DataOffsets                                         */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Get the data offsets for a tag in a resource fork.  Offsets are    */
  /*    stored in an array because, in some cases, resources in a resource */
  /*    fork have the same tag.                                            */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library ::                                                         */
  /*      A FreeType library instance.                                     */
  /*                                                                       */
  /*    stream ::                                                          */
  /*      A file stream containing the resource fork.                      */
  /*                                                                       */
  /*    map_offset ::                                                      */
  /*      The file offset where the resource map starts.                   */
  /*                                                                       */
  /*    rdata_pos ::                                                       */
  /*      The file offset where the resource data starts.                  */
  /*                                                                       */
  /*    tag ::                                                             */
  /*      The resource tag.                                                */
  /*                                                                       */
  /* <Output>                                                              */
  /*    offsets ::                                                         */
  /*      The stream offsets for the resource data specified by `tag'.     */
  /*      This array is allocated by the function, so you have to call     */
  /*      @ft_mem_free after use.                                          */
  /*                                                                       */
  /*    count ::                                                           */
  /*      The length of offsets array.                                     */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  FT_Err_Ok means success.                     */
  /*                                                                       */
  /* <Note>                                                                */
  /*    Normally you should use `FT_Raccess_Get_HeaderInfo' to get the     */
  /*    value for `map_offset' and `rdata_pos'.                            */
  /*                                                                       */
  FT_BASE( FT_Error )
  FT_Raccess_Get_DataOffsets( FT_Library  library,
                              FT_Stream   stream,
                              FT_Long     map_offset,
                              FT_Long     rdata_pos,
                              FT_Long     tag,
                              FT_Long   **offsets,
                              FT_Long    *count );


FT_END_HEADER

#endif /* __FTRFORK_H__ */


/* END */

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