1/***************************************************************************/ 2/* */ 3/* ftrfork.h */ 4/* */ 5/* Embedded resource forks accessor (specification). */ 6/* */ 7/* Copyright 2004, 2006, 2007 by */ 8/* Masatake YAMATO and Redhat K.K. */ 9/* */ 10/* This file is part of the FreeType project, and may only be used, */ 11/* modified, and distributed under the terms of the FreeType project */ 12/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13/* this file you indicate that you have read the license and */ 14/* understand and accept it fully. */ 15/* */ 16/***************************************************************************/ 17 18/***************************************************************************/ 19/* Development of the code in this file is support of */ 20/* Information-technology Promotion Agency, Japan. */ 21/***************************************************************************/ 22 23 24#ifndef __FTRFORK_H__ 25#define __FTRFORK_H__ 26 27 28#include <ft2build.h> 29#include FT_INTERNAL_OBJECTS_H 30 31 32FT_BEGIN_HEADER 33 34 35 /* Number of guessing rules supported in `FT_Raccess_Guess'. */ 36 /* Don't forget to increment the number if you add a new guessing rule. */ 37#define FT_RACCESS_N_RULES 9 38 39 40 /* A structure to describe a reference in a resource by its resource ID */ 41 /* and internal offset. The `POST' resource expects to be concatenated */ 42 /* by the order of resource IDs instead of its appearance in the file. */ 43 44 typedef struct FT_RFork_Ref_ 45 { 46 FT_UShort res_id; 47 FT_ULong offset; 48 49 } FT_RFork_Ref; 50 51 52 /*************************************************************************/ 53 /* */ 54 /* <Function> */ 55 /* FT_Raccess_Guess */ 56 /* */ 57 /* <Description> */ 58 /* Guess a file name and offset where the actual resource fork is */ 59 /* stored. The macro FT_RACCESS_N_RULES holds the number of */ 60 /* guessing rules; the guessed result for the Nth rule is */ 61 /* represented as a triplet: a new file name (new_names[N]), a file */ 62 /* offset (offsets[N]), and an error code (errors[N]). */ 63 /* */ 64 /* <Input> */ 65 /* library :: */ 66 /* A FreeType library instance. */ 67 /* */ 68 /* stream :: */ 69 /* A file stream containing the resource fork. */ 70 /* */ 71 /* base_name :: */ 72 /* The (base) file name of the resource fork used for some */ 73 /* guessing rules. */ 74 /* */ 75 /* <Output> */ 76 /* new_names :: */ 77 /* An array of guessed file names in which the resource forks may */ 78 /* exist. If `new_names[N]' is NULL, the guessed file name is */ 79 /* equal to `base_name'. */ 80 /* */ 81 /* offsets :: */ 82 /* An array of guessed file offsets. `offsets[N]' holds the file */ 83 /* offset of the possible start of the resource fork in file */ 84 /* `new_names[N]'. */ 85 /* */ 86 /* errors :: */ 87 /* An array of FreeType error codes. `errors[N]' is the error */ 88 /* code of Nth guessing rule function. If `errors[N]' is not */ 89 /* FT_Err_Ok, `new_names[N]' and `offsets[N]' are meaningless. */ 90 /* */ 91 FT_BASE( void ) 92 FT_Raccess_Guess( FT_Library library, 93 FT_Stream stream, 94 char* base_name, 95 char** new_names, 96 FT_Long* offsets, 97 FT_Error* errors ); 98 99 100 /*************************************************************************/ 101 /* */ 102 /* <Function> */ 103 /* FT_Raccess_Get_HeaderInfo */ 104 /* */ 105 /* <Description> */ 106 /* Get the information from the header of resource fork. The */ 107 /* information includes the file offset where the resource map */ 108 /* starts, and the file offset where the resource data starts. */ 109 /* `FT_Raccess_Get_DataOffsets' requires these two data. */ 110 /* */ 111 /* <Input> */ 112 /* library :: */ 113 /* A FreeType library instance. */ 114 /* */ 115 /* stream :: */ 116 /* A file stream containing the resource fork. */ 117 /* */ 118 /* rfork_offset :: */ 119 /* The file offset where the resource fork starts. */ 120 /* */ 121 /* <Output> */ 122 /* map_offset :: */ 123 /* The file offset where the resource map starts. */ 124 /* */ 125 /* rdata_pos :: */ 126 /* The file offset where the resource data starts. */ 127 /* */ 128 /* <Return> */ 129 /* FreeType error code. FT_Err_Ok means success. */ 130 /* */ 131 FT_BASE( FT_Error ) 132 FT_Raccess_Get_HeaderInfo( FT_Library library, 133 FT_Stream stream, 134 FT_Long rfork_offset, 135 FT_Long *map_offset, 136 FT_Long *rdata_pos ); 137 138 139 /*************************************************************************/ 140 /* */ 141 /* <Function> */ 142 /* FT_Raccess_Get_DataOffsets */ 143 /* */ 144 /* <Description> */ 145 /* Get the data offsets for a tag in a resource fork. Offsets are */ 146 /* stored in an array because, in some cases, resources in a resource */ 147 /* fork have the same tag. */ 148 /* */ 149 /* <Input> */ 150 /* library :: */ 151 /* A FreeType library instance. */ 152 /* */ 153 /* stream :: */ 154 /* A file stream containing the resource fork. */ 155 /* */ 156 /* map_offset :: */ 157 /* The file offset where the resource map starts. */ 158 /* */ 159 /* rdata_pos :: */ 160 /* The file offset where the resource data starts. */ 161 /* */ 162 /* tag :: */ 163 /* The resource tag. */ 164 /* */ 165 /* <Output> */ 166 /* offsets :: */ 167 /* The stream offsets for the resource data specified by `tag'. */ 168 /* This array is allocated by the function, so you have to call */ 169 /* @ft_mem_free after use. */ 170 /* */ 171 /* count :: */ 172 /* The length of offsets array. */ 173 /* */ 174 /* <Return> */ 175 /* FreeType error code. FT_Err_Ok means success. */ 176 /* */ 177 /* <Note> */ 178 /* Normally you should use `FT_Raccess_Get_HeaderInfo' to get the */ 179 /* value for `map_offset' and `rdata_pos'. */ 180 /* */ 181 FT_BASE( FT_Error ) 182 FT_Raccess_Get_DataOffsets( FT_Library library, 183 FT_Stream stream, 184 FT_Long map_offset, 185 FT_Long rdata_pos, 186 FT_Long tag, 187 FT_Long **offsets, 188 FT_Long *count ); 189 190 191FT_END_HEADER 192 193#endif /* __FTRFORK_H__ */ 194 195 196/* END */ 197