1 |
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2 /* pngconf.h - machine configurable file for libpng |
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3 * |
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4 * libpng version 1.5.13 - September 27, 2012 |
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5 * |
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6 * Copyright (c) 1998-2012 Glenn Randers-Pehrson |
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7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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9 * |
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10 * This code is released under the libpng license. |
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11 * For conditions of distribution and use, see the disclaimer |
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12 * and license in png.h |
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13 * |
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14 */ |
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15 |
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16 /* Any machine specific code is near the front of this file, so if you |
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17 * are configuring libpng for a machine, you may want to read the section |
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18 * starting here down to where it starts to typedef png_color, png_text, |
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19 * and png_info. |
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20 */ |
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21 |
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22 #ifndef PNGCONF_H |
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23 #define PNGCONF_H |
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24 |
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25 #ifndef PNG_BUILDING_SYMBOL_TABLE |
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26 /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C |
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27 * definition file for machine specific limits, this may impact the |
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28 * correctness of the definitions below (see uses of INT_MAX). |
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29 */ |
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30 # ifndef PNG_NO_LIMITS_H |
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31 # include <limits.h> |
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32 # endif |
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33 |
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34 /* For the memory copy APIs (i.e. the standard definitions of these), |
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35 * because this file defines png_memcpy and so on the base APIs must |
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36 * be defined here. |
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37 */ |
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38 # ifdef BSD |
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39 # include <strings.h> |
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40 # else |
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41 # include <string.h> |
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42 # endif |
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43 |
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44 /* For png_FILE_p - this provides the standard definition of a |
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45 * FILE |
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46 */ |
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47 # ifdef PNG_STDIO_SUPPORTED |
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48 # include <stdio.h> |
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49 # endif |
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50 #endif |
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51 |
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52 /* This controls optimization of the reading of 16 and 32 bit values |
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53 * from PNG files. It can be set on a per-app-file basis - it |
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54 * just changes whether a macro is used when the function is called. |
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55 * The library builder sets the default; if read functions are not |
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56 * built into the library the macro implementation is forced on. |
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57 */ |
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58 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED |
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59 # define PNG_USE_READ_MACROS |
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60 #endif |
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61 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) |
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62 # if PNG_DEFAULT_READ_MACROS |
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63 # define PNG_USE_READ_MACROS |
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64 # endif |
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65 #endif |
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66 |
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67 /* COMPILER SPECIFIC OPTIONS. |
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68 * |
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69 * These options are provided so that a variety of difficult compilers |
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70 * can be used. Some are fixed at build time (e.g. PNG_API_RULE |
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71 * below) but still have compiler specific implementations, others |
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72 * may be changed on a per-file basis when compiling against libpng. |
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73 */ |
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74 |
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75 /* The PNGARG macro protects us against machines that don't have function |
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76 * prototypes (ie K&R style headers). If your compiler does not handle |
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77 * function prototypes, define this macro and use the included ansi2knr. |
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78 * I've always been able to use _NO_PROTO as the indicator, but you may |
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79 * need to drag the empty declaration out in front of here, or change the |
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80 * ifdef to suit your own needs. |
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81 */ |
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82 #ifndef PNGARG |
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83 |
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84 # ifdef OF /* zlib prototype munger */ |
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85 # define PNGARG(arglist) OF(arglist) |
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86 # else |
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87 |
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88 # ifdef _NO_PROTO |
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89 # define PNGARG(arglist) () |
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90 # else |
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91 # define PNGARG(arglist) arglist |
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92 # endif /* _NO_PROTO */ |
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93 |
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94 # endif /* OF */ |
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95 |
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96 #endif /* PNGARG */ |
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97 |
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98 /* Function calling conventions. |
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99 * ============================= |
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100 * Normally it is not necessary to specify to the compiler how to call |
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101 * a function - it just does it - however on x86 systems derived from |
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102 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems |
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103 * and some others) there are multiple ways to call a function and the |
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104 * default can be changed on the compiler command line. For this reason |
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105 * libpng specifies the calling convention of every exported function and |
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106 * every function called via a user supplied function pointer. This is |
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107 * done in this file by defining the following macros: |
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108 * |
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109 * PNGAPI Calling convention for exported functions. |
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110 * PNGCBAPI Calling convention for user provided (callback) functions. |
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111 * PNGCAPI Calling convention used by the ANSI-C library (required |
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112 * for longjmp callbacks and sometimes used internally to |
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113 * specify the calling convention for zlib). |
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114 * |
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115 * These macros should never be overridden. If it is necessary to |
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116 * change calling convention in a private build this can be done |
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117 * by setting PNG_API_RULE (which defaults to 0) to one of the values |
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118 * below to select the correct 'API' variants. |
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119 * |
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120 * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout. |
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121 * This is correct in every known environment. |
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122 * PNG_API_RULE=1 Use the operating system convention for PNGAPI and |
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123 * the 'C' calling convention (from PNGCAPI) for |
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124 * callbacks (PNGCBAPI). This is no longer required |
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125 * in any known environment - if it has to be used |
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126 * please post an explanation of the problem to the |
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127 * libpng mailing list. |
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128 * |
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129 * These cases only differ if the operating system does not use the C |
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130 * calling convention, at present this just means the above cases |
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131 * (x86 DOS/Windows sytems) and, even then, this does not apply to |
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132 * Cygwin running on those systems. |
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133 * |
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134 * Note that the value must be defined in pnglibconf.h so that what |
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135 * the application uses to call the library matches the conventions |
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136 * set when building the library. |
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137 */ |
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138 |
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139 /* Symbol export |
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140 * ============= |
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141 * When building a shared library it is almost always necessary to tell |
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142 * the compiler which symbols to export. The png.h macro 'PNG_EXPORT' |
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143 * is used to mark the symbols. On some systems these symbols can be |
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144 * extracted at link time and need no special processing by the compiler, |
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145 * on other systems the symbols are flagged by the compiler and just |
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146 * the declaration requires a special tag applied (unfortunately) in a |
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147 * compiler dependent way. Some systems can do either. |
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148 * |
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149 * A small number of older systems also require a symbol from a DLL to |
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150 * be flagged to the program that calls it. This is a problem because |
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151 * we do not know in the header file included by application code that |
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152 * the symbol will come from a shared library, as opposed to a statically |
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153 * linked one. For this reason the application must tell us by setting |
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154 * the magic flag PNG_USE_DLL to turn on the special processing before |
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155 * it includes png.h. |
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156 * |
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157 * Four additional macros are used to make this happen: |
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158 * |
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159 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from |
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160 * the build or imported if PNG_USE_DLL is set - compiler |
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161 * and system specific. |
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162 * |
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163 * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to |
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164 * 'type', compiler specific. |
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165 * |
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166 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to |
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167 * make a symbol exported from the DLL. Not used in the |
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168 * public header files; see pngpriv.h for how it is used |
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169 * in the libpng build. |
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170 * |
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171 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come |
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172 * from a DLL - used to define PNG_IMPEXP when |
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173 * PNG_USE_DLL is set. |
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174 */ |
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175 |
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176 /* System specific discovery. |
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177 * ========================== |
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178 * This code is used at build time to find PNG_IMPEXP, the API settings |
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179 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL |
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180 * import processing is possible. On Windows/x86 systems it also sets |
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181 * compiler-specific macros to the values required to change the calling |
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182 * conventions of the various functions. |
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183 */ |
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184 #if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\ |
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185 defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\ |
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186 ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\ |
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187 defined(_M_X64) || defined(_M_IA64) ) |
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188 /* Windows system (DOS doesn't support DLLs) running on x86/x64. Includes |
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189 * builds under Cygwin or MinGW. Also includes Watcom builds but these need |
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190 * special treatment because they are not compatible with GCC or Visual C |
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191 * because of different calling conventions. |
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192 */ |
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193 # if PNG_API_RULE == 2 |
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194 /* If this line results in an error, either because __watcall is not |
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195 * understood or because of a redefine just below you cannot use *this* |
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196 * build of the library with the compiler you are using. *This* build was |
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197 * build using Watcom and applications must also be built using Watcom! |
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198 */ |
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199 # define PNGCAPI __watcall |
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200 # endif |
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201 |
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202 # if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800)) |
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203 # define PNGCAPI __cdecl |
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204 # if PNG_API_RULE == 1 |
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205 # define PNGAPI __stdcall |
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206 # endif |
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207 # else |
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208 /* An older compiler, or one not detected (erroneously) above, |
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209 * if necessary override on the command line to get the correct |
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210 * variants for the compiler. |
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211 */ |
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212 # ifndef PNGCAPI |
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213 # define PNGCAPI _cdecl |
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214 # endif |
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215 # if PNG_API_RULE == 1 && !defined(PNGAPI) |
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216 # define PNGAPI _stdcall |
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217 # endif |
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218 # endif /* compiler/api */ |
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219 /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ |
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220 |
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221 # if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) |
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222 ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed |
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223 # endif |
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224 |
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225 # if (defined(_MSC_VER) && _MSC_VER < 800) ||\ |
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226 (defined(__BORLANDC__) && __BORLANDC__ < 0x500) |
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227 /* older Borland and MSC |
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228 * compilers used '__export' and required this to be after |
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229 * the type. |
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230 */ |
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231 # ifndef PNG_EXPORT_TYPE |
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232 # define PNG_EXPORT_TYPE(type) type PNG_IMPEXP |
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233 # endif |
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234 # define PNG_DLL_EXPORT __export |
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235 # else /* newer compiler */ |
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236 # define PNG_DLL_EXPORT __declspec(dllexport) |
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237 # ifndef PNG_DLL_IMPORT |
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238 # define PNG_DLL_IMPORT __declspec(dllimport) |
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239 # endif |
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240 # endif /* compiler */ |
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241 |
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242 #else /* !Windows/x86 */ |
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243 # if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) |
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244 # define PNGAPI _System |
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245 # else /* !Windows/x86 && !OS/2 */ |
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246 /* Use the defaults, or define PNG*API on the command line (but |
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247 * this will have to be done for every compile!) |
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248 */ |
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249 # endif /* other system, !OS/2 */ |
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250 #endif /* !Windows/x86 */ |
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251 |
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252 /* Now do all the defaulting . */ |
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253 #ifndef PNGCAPI |
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254 # define PNGCAPI |
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255 #endif |
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256 #ifndef PNGCBAPI |
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257 # define PNGCBAPI PNGCAPI |
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258 #endif |
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259 #ifndef PNGAPI |
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260 # define PNGAPI PNGCAPI |
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261 #endif |
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262 |
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263 /* PNG_IMPEXP may be set on the compilation system command line or (if not set) |
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264 * then in an internal header file when building the library, otherwise (when |
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265 * using the library) it is set here. |
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266 */ |
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267 #ifndef PNG_IMPEXP |
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268 # if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT) |
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269 /* This forces use of a DLL, disallowing static linking */ |
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270 # define PNG_IMPEXP PNG_DLL_IMPORT |
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271 # endif |
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272 |
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273 # ifndef PNG_IMPEXP |
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274 # define PNG_IMPEXP |
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275 # endif |
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276 #endif |
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277 |
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278 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat |
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279 * 'attributes' as a storage class - the attributes go at the start of the |
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280 * function definition, and attributes are always appended regardless of the |
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281 * compiler. This considerably simplifies these macros but may cause problems |
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282 * if any compilers both need function attributes and fail to handle them as |
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283 * a storage class (this is unlikely.) |
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284 */ |
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285 #ifndef PNG_FUNCTION |
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286 # define PNG_FUNCTION(type, name, args, attributes) attributes type name args |
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287 #endif |
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288 |
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289 #ifndef PNG_EXPORT_TYPE |
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290 # define PNG_EXPORT_TYPE(type) PNG_IMPEXP type |
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291 #endif |
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292 |
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293 /* The ordinal value is only relevant when preprocessing png.h for symbol |
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294 * table entries, so we discard it here. See the .dfn files in the |
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295 * scripts directory. |
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296 */ |
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297 #ifndef PNG_EXPORTA |
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298 |
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299 # define PNG_EXPORTA(ordinal, type, name, args, attributes)\ |
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300 PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \ |
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301 extern attributes) |
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302 #endif |
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303 |
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304 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument, |
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305 * so make something non-empty to satisfy the requirement: |
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306 */ |
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307 #define PNG_EMPTY /*empty list*/ |
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308 |
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309 #define PNG_EXPORT(ordinal, type, name, args)\ |
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310 PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY) |
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311 |
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312 /* Use PNG_REMOVED to comment out a removed interface. */ |
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313 #ifndef PNG_REMOVED |
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314 # define PNG_REMOVED(ordinal, type, name, args, attributes) |
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315 #endif |
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316 |
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317 #ifndef PNG_CALLBACK |
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318 # define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args) |
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319 #endif |
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320 |
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321 /* Support for compiler specific function attributes. These are used |
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322 * so that where compiler support is available incorrect use of API |
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323 * functions in png.h will generate compiler warnings. |
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324 * |
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325 * Added at libpng-1.2.41. |
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326 */ |
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327 |
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328 #ifndef PNG_NO_PEDANTIC_WARNINGS |
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329 # ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED |
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330 # define PNG_PEDANTIC_WARNINGS_SUPPORTED |
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331 # endif |
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332 #endif |
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333 |
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334 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED |
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335 /* Support for compiler specific function attributes. These are used |
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336 * so that where compiler support is available incorrect use of API |
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337 * functions in png.h will generate compiler warnings. Added at libpng |
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338 * version 1.2.41. |
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339 */ |
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340 # if defined(__GNUC__) |
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341 # ifndef PNG_USE_RESULT |
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342 # define PNG_USE_RESULT __attribute__((__warn_unused_result__)) |
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343 # endif |
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344 # ifndef PNG_NORETURN |
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345 # define PNG_NORETURN __attribute__((__noreturn__)) |
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346 # endif |
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347 # if __GNUC__ >= 3 |
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348 # ifndef PNG_ALLOCATED |
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349 # define PNG_ALLOCATED __attribute__((__malloc__)) |
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350 # endif |
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351 # ifndef PNG_DEPRECATED |
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352 # define PNG_DEPRECATED __attribute__((__deprecated__)) |
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353 # endif |
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354 # ifndef PNG_PRIVATE |
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355 # if 0 /* Doesn't work so we use deprecated instead*/ |
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356 # define PNG_PRIVATE \ |
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357 __attribute__((warning("This function is not exported by libpng."))) |
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358 # else |
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359 # define PNG_PRIVATE \ |
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360 __attribute__((__deprecated__)) |
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361 # endif |
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362 # endif |
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363 # endif /* __GNUC__ >= 3 */ |
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364 # endif /* __GNUC__ */ |
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365 |
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366 # if defined(_MSC_VER) && (_MSC_VER >= 1300) |
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367 # ifndef PNG_USE_RESULT |
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368 # define PNG_USE_RESULT /* not supported */ |
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369 # endif |
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370 # ifndef PNG_NORETURN |
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371 # define PNG_NORETURN __declspec(noreturn) |
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372 # endif |
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373 # ifndef PNG_ALLOCATED |
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374 # if (_MSC_VER >= 1400) |
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375 # define PNG_ALLOCATED __declspec(restrict) |
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376 # endif |
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377 # endif |
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378 # ifndef PNG_DEPRECATED |
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379 # define PNG_DEPRECATED __declspec(deprecated) |
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380 # endif |
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381 # ifndef PNG_PRIVATE |
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382 # define PNG_PRIVATE __declspec(deprecated) |
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383 # endif |
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384 # endif /* _MSC_VER */ |
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385 #endif /* PNG_PEDANTIC_WARNINGS */ |
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386 |
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387 #ifndef PNG_DEPRECATED |
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388 # define PNG_DEPRECATED /* Use of this function is deprecated */ |
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389 #endif |
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390 #ifndef PNG_USE_RESULT |
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391 # define PNG_USE_RESULT /* The result of this function must be checked */ |
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392 #endif |
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393 #ifndef PNG_NORETURN |
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394 # define PNG_NORETURN /* This function does not return */ |
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395 #endif |
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396 #ifndef PNG_ALLOCATED |
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397 # define PNG_ALLOCATED /* The result of the function is new memory */ |
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398 #endif |
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399 #ifndef PNG_PRIVATE |
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400 # define PNG_PRIVATE /* This is a private libpng function */ |
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401 #endif |
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402 #ifndef PNG_FP_EXPORT /* A floating point API. */ |
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403 # ifdef PNG_FLOATING_POINT_SUPPORTED |
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404 # define PNG_FP_EXPORT(ordinal, type, name, args)\ |
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405 PNG_EXPORT(ordinal, type, name, args); |
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406 # else /* No floating point APIs */ |
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407 # define PNG_FP_EXPORT(ordinal, type, name, args) |
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408 # endif |
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409 #endif |
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410 #ifndef PNG_FIXED_EXPORT /* A fixed point API. */ |
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411 # ifdef PNG_FIXED_POINT_SUPPORTED |
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412 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ |
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413 PNG_EXPORT(ordinal, type, name, args); |
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414 # else /* No fixed point APIs */ |
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415 # define PNG_FIXED_EXPORT(ordinal, type, name, args) |
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416 # endif |
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417 #endif |
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418 |
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419 /* The following uses const char * instead of char * for error |
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420 * and warning message functions, so some compilers won't complain. |
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421 * If you do not want to use const, define PNG_NO_CONST here. |
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422 * |
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423 * This should not change how the APIs are called, so it can be done |
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424 * on a per-file basis in the application. |
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425 */ |
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426 #ifndef PNG_CONST |
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427 # ifndef PNG_NO_CONST |
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428 # define PNG_CONST const |
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429 # else |
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430 # define PNG_CONST |
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431 # endif |
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432 #endif |
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433 |
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434 /* Some typedefs to get us started. These should be safe on most of the |
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435 * common platforms. The typedefs should be at least as large as the |
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436 * numbers suggest (a png_uint_32 must be at least 32 bits long), but they |
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437 * don't have to be exactly that size. Some compilers dislike passing |
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438 * unsigned shorts as function parameters, so you may be better off using |
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439 * unsigned int for png_uint_16. |
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440 */ |
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441 |
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442 #if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL) |
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443 typedef unsigned int png_uint_32; |
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444 typedef int png_int_32; |
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445 #else |
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446 typedef unsigned long png_uint_32; |
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447 typedef long png_int_32; |
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448 #endif |
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449 typedef unsigned short png_uint_16; |
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450 typedef short png_int_16; |
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451 typedef unsigned char png_byte; |
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452 |
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453 #ifdef PNG_NO_SIZE_T |
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454 typedef unsigned int png_size_t; |
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455 #else |
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456 typedef size_t png_size_t; |
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457 #endif |
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458 #define png_sizeof(x) (sizeof (x)) |
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459 |
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460 /* The following is needed for medium model support. It cannot be in the |
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461 * pngpriv.h header. Needs modification for other compilers besides |
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462 * MSC. Model independent support declares all arrays and pointers to be |
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463 * large using the far keyword. The zlib version used must also support |
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464 * model independent data. As of version zlib 1.0.4, the necessary changes |
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465 * have been made in zlib. The USE_FAR_KEYWORD define triggers other |
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466 * changes that are needed. (Tim Wegner) |
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467 */ |
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468 |
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469 /* Separate compiler dependencies (problem here is that zlib.h always |
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470 * defines FAR. (SJT) |
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471 */ |
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472 #ifdef __BORLANDC__ |
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473 # if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__) |
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474 # define LDATA 1 |
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475 # else |
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476 # define LDATA 0 |
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477 # endif |
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478 /* GRR: why is Cygwin in here? Cygwin is not Borland C... */ |
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479 # if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__) |
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480 # define PNG_MAX_MALLOC_64K /* only used in build */ |
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481 # if (LDATA != 1) |
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482 # ifndef FAR |
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483 # define FAR __far |
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484 # endif |
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485 # define USE_FAR_KEYWORD |
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486 # endif /* LDATA != 1 */ |
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487 /* Possibly useful for moving data out of default segment. |
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488 * Uncomment it if you want. Could also define FARDATA as |
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489 * const if your compiler supports it. (SJT) |
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490 # define FARDATA FAR |
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491 */ |
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492 # endif /* __WIN32__, __FLAT__, __CYGWIN__ */ |
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493 #endif /* __BORLANDC__ */ |
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494 |
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495 |
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496 /* Suggest testing for specific compiler first before testing for |
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497 * FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM, |
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498 * making reliance oncertain keywords suspect. (SJT) |
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499 */ |
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500 |
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501 /* MSC Medium model */ |
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502 #ifdef FAR |
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503 # ifdef M_I86MM |
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504 # define USE_FAR_KEYWORD |
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505 # define FARDATA FAR |
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506 # include <dos.h> |
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507 # endif |
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508 #endif |
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509 |
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510 /* SJT: default case */ |
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511 #ifndef FAR |
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512 # define FAR |
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513 #endif |
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514 |
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515 /* At this point FAR is always defined */ |
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516 #ifndef FARDATA |
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517 # define FARDATA |
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518 #endif |
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519 |
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520 /* Typedef for floating-point numbers that are converted |
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521 * to fixed-point with a multiple of 100,000, e.g., gamma |
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522 */ |
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523 typedef png_int_32 png_fixed_point; |
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524 |
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525 /* Add typedefs for pointers */ |
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526 typedef void FAR * png_voidp; |
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527 typedef PNG_CONST void FAR * png_const_voidp; |
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528 typedef png_byte FAR * png_bytep; |
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529 typedef PNG_CONST png_byte FAR * png_const_bytep; |
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530 typedef png_uint_32 FAR * png_uint_32p; |
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531 typedef PNG_CONST png_uint_32 FAR * png_const_uint_32p; |
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532 typedef png_int_32 FAR * png_int_32p; |
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533 typedef PNG_CONST png_int_32 FAR * png_const_int_32p; |
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534 typedef png_uint_16 FAR * png_uint_16p; |
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535 typedef PNG_CONST png_uint_16 FAR * png_const_uint_16p; |
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536 typedef png_int_16 FAR * png_int_16p; |
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537 typedef PNG_CONST png_int_16 FAR * png_const_int_16p; |
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538 typedef char FAR * png_charp; |
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539 typedef PNG_CONST char FAR * png_const_charp; |
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540 typedef png_fixed_point FAR * png_fixed_point_p; |
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541 typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p; |
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542 typedef png_size_t FAR * png_size_tp; |
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543 typedef PNG_CONST png_size_t FAR * png_const_size_tp; |
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544 |
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545 #ifdef PNG_STDIO_SUPPORTED |
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546 typedef FILE * png_FILE_p; |
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547 #endif |
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548 |
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549 #ifdef PNG_FLOATING_POINT_SUPPORTED |
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550 typedef double FAR * png_doublep; |
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551 typedef PNG_CONST double FAR * png_const_doublep; |
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552 #endif |
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553 |
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554 /* Pointers to pointers; i.e. arrays */ |
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555 typedef png_byte FAR * FAR * png_bytepp; |
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556 typedef png_uint_32 FAR * FAR * png_uint_32pp; |
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557 typedef png_int_32 FAR * FAR * png_int_32pp; |
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558 typedef png_uint_16 FAR * FAR * png_uint_16pp; |
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559 typedef png_int_16 FAR * FAR * png_int_16pp; |
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560 typedef PNG_CONST char FAR * FAR * png_const_charpp; |
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561 typedef char FAR * FAR * png_charpp; |
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562 typedef png_fixed_point FAR * FAR * png_fixed_point_pp; |
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563 #ifdef PNG_FLOATING_POINT_SUPPORTED |
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564 typedef double FAR * FAR * png_doublepp; |
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565 #endif |
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566 |
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567 /* Pointers to pointers to pointers; i.e., pointer to array */ |
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568 typedef char FAR * FAR * FAR * png_charppp; |
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569 |
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570 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t, |
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571 * and no smaller than png_uint_32. Casts from png_size_t or png_uint_32 |
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572 * to png_alloc_size_t are not necessary; in fact, it is recommended |
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573 * not to use them at all so that the compiler can complain when something |
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574 * turns out to be problematic. |
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575 * Casts in the other direction (from png_alloc_size_t to png_size_t or |
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576 * png_uint_32) should be explicitly applied; however, we do not expect |
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577 * to encounter practical situations that require such conversions. |
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578 */ |
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579 #if defined(__TURBOC__) && !defined(__FLAT__) |
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580 typedef unsigned long png_alloc_size_t; |
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581 #else |
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582 # if defined(_MSC_VER) && defined(MAXSEG_64K) |
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583 typedef unsigned long png_alloc_size_t; |
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584 # else |
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585 /* This is an attempt to detect an old Windows system where (int) is |
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586 * actually 16 bits, in that case png_malloc must have an argument with a |
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587 * bigger size to accomodate the requirements of the library. |
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588 */ |
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589 # if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \ |
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590 (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL) |
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591 typedef DWORD png_alloc_size_t; |
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592 # else |
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593 typedef png_size_t png_alloc_size_t; |
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594 # endif |
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595 # endif |
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596 #endif |
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597 |
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598 #endif /* PNGCONF_H */ |
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