Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1 | |
| 2 | /* pngwio.c - functions for data output |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | 65a2237 | 2010-03-03 05:38:29 -0600 | [diff] [blame] | 4 | * Last changed in libpng 1.5.0 [March 3, 2010] |
Glenn Randers-Pehrson | e69b55d | 2010-01-01 10:29:06 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2010 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 8 | * |
Glenn Randers-Pehrson | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 9 | * This code is released under the libpng license. |
Glenn Randers-Pehrson | c332bbc | 2009-06-25 13:43:50 -0500 | [diff] [blame] | 10 | * For conditions of distribution and use, see the disclaimer |
Glenn Randers-Pehrson | 037023b | 2009-06-24 10:27:36 -0500 | [diff] [blame] | 11 | * and license in png.h |
Glenn Randers-Pehrson | 3e61d79 | 2009-06-24 09:31:28 -0500 | [diff] [blame] | 12 | * |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 13 | * This file provides a location for all output. Users who need |
| 14 | * special handling are expected to write functions that have the same |
| 15 | * arguments as these and perform similar functions, but that possibly |
| 16 | * use different output methods. Note that you shouldn't change these |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 17 | * functions, but rather write replacement functions and then change |
| 18 | * them at run time with png_set_write_fn(...). |
| 19 | */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 20 | |
Glenn Randers-Pehrson | f979531 | 2010-02-09 01:16:48 -0600 | [diff] [blame] | 21 | #define PNG_EXPOSE_INTERNAL_STRUCTURES |
Glenn Randers-Pehrson | 03f9b02 | 2009-12-04 08:40:41 -0600 | [diff] [blame] | 22 | #define PNG_NO_PEDANTIC_WARNINGS |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 23 | #include "png.h" |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 24 | #ifdef PNG_WRITE_SUPPORTED |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 25 | #include "pngpriv.h" |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 26 | |
| 27 | /* Write the data to whatever output you are using. The default routine |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 28 | * writes to a file pointer. Note that this routine sometimes gets called |
| 29 | * with very small lengths, so you should implement some kind of simple |
| 30 | * buffering if you are using unbuffered writes. This should never be asked |
| 31 | * to write more than 64K on a 16 bit machine. |
| 32 | */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 33 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 34 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 35 | png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 36 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 37 | if (png_ptr->write_data_fn != NULL ) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 38 | (*(png_ptr->write_data_fn))(png_ptr, data, length); |
| 39 | else |
| 40 | png_error(png_ptr, "Call to NULL write function"); |
| 41 | } |
| 42 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 43 | #ifdef PNG_STDIO_SUPPORTED |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 44 | /* This is the function that does the actual writing of data. If you are |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 45 | * not writing to a standard C stream, you should create a replacement |
| 46 | * write_data function and use it at run time with png_set_write_fn(), rather |
| 47 | * than changing the library. |
| 48 | */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 49 | #ifndef USE_FAR_KEYWORD |
Glenn Randers-Pehrson | 25d8224 | 2002-05-01 11:51:26 -0500 | [diff] [blame] | 50 | void PNGAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 51 | png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 52 | { |
| 53 | png_uint_32 check; |
| 54 | |
Glenn Randers-Pehrson | d8eb62f | 2009-05-30 20:19:20 -0500 | [diff] [blame] | 55 | if (png_ptr == NULL) |
| 56 | return; |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 57 | check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 58 | if (check != length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 59 | png_error(png_ptr, "Write Error"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 60 | } |
| 61 | #else |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 62 | /* This is the model-independent version. Since the standard I/O library |
| 63 | * can't handle far buffers in the medium and small models, we have to copy |
| 64 | * the data. |
| 65 | */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 66 | |
| 67 | #define NEAR_BUF_SIZE 1024 |
| 68 | #define MIN(a,b) (a <= b ? a : b) |
| 69 | |
Glenn Randers-Pehrson | 25d8224 | 2002-05-01 11:51:26 -0500 | [diff] [blame] | 70 | void PNGAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 71 | png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 72 | { |
| 73 | png_uint_32 check; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 74 | png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */ |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 75 | png_FILE_p io_ptr; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 76 | |
Glenn Randers-Pehrson | d8eb62f | 2009-05-30 20:19:20 -0500 | [diff] [blame] | 77 | if (png_ptr == NULL) |
| 78 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 79 | /* Check if data really is near. If so, use usual code. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 80 | near_data = (png_byte *)CVT_PTR_NOCHECK(data); |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 81 | io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 82 | if ((png_bytep)near_data == data) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 83 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 84 | check = fwrite(near_data, 1, length, io_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 85 | } |
| 86 | else |
| 87 | { |
| 88 | png_byte buf[NEAR_BUF_SIZE]; |
| 89 | png_size_t written, remaining, err; |
| 90 | check = 0; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 91 | remaining = length; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 92 | do |
| 93 | { |
| 94 | written = MIN(NEAR_BUF_SIZE, remaining); |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 95 | png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 96 | err = fwrite(buf, 1, written, io_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 97 | if (err != written) |
| 98 | break; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 99 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 100 | else |
| 101 | check += err; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 102 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 103 | data += written; |
| 104 | remaining -= written; |
| 105 | } |
| 106 | while (remaining != 0); |
| 107 | } |
| 108 | if (check != length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 109 | png_error(png_ptr, "Write Error"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | #endif |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 113 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 114 | |
| 115 | /* This function is called to output any data pending writing (normally |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 116 | * to disk). After png_flush is called, there should be no data pending |
| 117 | * writing in any buffers. |
| 118 | */ |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 119 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 120 | void /* PRIVATE */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 121 | png_flush(png_structp png_ptr) |
| 122 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 123 | if (png_ptr->output_flush_fn != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 124 | (*(png_ptr->output_flush_fn))(png_ptr); |
| 125 | } |
| 126 | |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 127 | # ifdef PNG_STDIO_SUPPORTED |
Glenn Randers-Pehrson | 25d8224 | 2002-05-01 11:51:26 -0500 | [diff] [blame] | 128 | void PNGAPI |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 129 | png_default_flush(png_structp png_ptr) |
| 130 | { |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 131 | png_FILE_p io_ptr; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 132 | if (png_ptr == NULL) |
| 133 | return; |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 134 | io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr)); |
Glenn Randers-Pehrson | 8fb550c | 2009-03-21 08:15:32 -0500 | [diff] [blame] | 135 | fflush(io_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 136 | } |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 137 | # endif |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 138 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 139 | |
| 140 | /* This function allows the application to supply new output functions for |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 141 | * libpng if standard C streams aren't being used. |
| 142 | * |
| 143 | * This function takes as its arguments: |
| 144 | * png_ptr - pointer to a png output data structure |
| 145 | * io_ptr - pointer to user supplied structure containing info about |
| 146 | * the output functions. May be NULL. |
| 147 | * write_data_fn - pointer to a new output function that takes as its |
| 148 | * arguments a pointer to a png_struct, a pointer to |
| 149 | * data to be written, and a 32-bit unsigned int that is |
| 150 | * the number of bytes to be written. The new write |
| 151 | * function should call png_error(png_ptr, "Error msg") |
| 152 | * to exit and output any fatal error messages. May be |
| 153 | * NULL, in which case libpng's default function will |
| 154 | * be used. |
| 155 | * flush_data_fn - pointer to a new flush function that takes as its |
| 156 | * arguments a pointer to a png_struct. After a call to |
| 157 | * the flush function, there should be no data in any buffers |
| 158 | * or pending transmission. If the output method doesn't do |
| 159 | * any buffering of ouput, a function prototype must still be |
| 160 | * supplied although it doesn't have to do anything. If |
| 161 | * PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile |
| 162 | * time, output_flush_fn will be ignored, although it must be |
| 163 | * supplied for compatibility. May be NULL, in which case |
| 164 | * libpng's default function will be used, if |
| 165 | * PNG_WRITE_FLUSH_SUPPORTED is defined. This is not |
| 166 | * a good idea if io_ptr does not point to a standard |
| 167 | * *FILE structure. |
| 168 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 169 | void PNGAPI |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 170 | png_set_write_fn(png_structp png_ptr, png_voidp io_ptr, |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 171 | png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 172 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 173 | if (png_ptr == NULL) |
| 174 | return; |
| 175 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 176 | png_ptr->io_ptr = io_ptr; |
| 177 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 178 | #ifdef PNG_STDIO_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 179 | if (write_data_fn != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 180 | png_ptr->write_data_fn = write_data_fn; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 181 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 182 | else |
Glenn Randers-Pehrson | 25d8224 | 2002-05-01 11:51:26 -0500 | [diff] [blame] | 183 | png_ptr->write_data_fn = png_default_write_data; |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 184 | #else |
| 185 | png_ptr->write_data_fn = write_data_fn; |
| 186 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 187 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 188 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 189 | # ifdef PNG_STDIO_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 190 | if (output_flush_fn != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 191 | png_ptr->output_flush_fn = output_flush_fn; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 192 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 193 | else |
Glenn Randers-Pehrson | 25d8224 | 2002-05-01 11:51:26 -0500 | [diff] [blame] | 194 | png_ptr->output_flush_fn = png_default_flush; |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 195 | # else |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 196 | png_ptr->output_flush_fn = output_flush_fn; |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 197 | # endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 198 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| 199 | |
| 200 | /* It is an error to read while writing a png file */ |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 201 | if (png_ptr->read_data_fn != NULL) |
| 202 | { |
| 203 | png_ptr->read_data_fn = NULL; |
| 204 | png_warning(png_ptr, |
| 205 | "Attempted to set both read_data_fn and write_data_fn in"); |
| 206 | png_warning(png_ptr, |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 207 | "the same structure. Resetting read_data_fn to NULL"); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 208 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 209 | } |
| 210 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 211 | #ifdef USE_FAR_KEYWORD |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 212 | # ifdef _MSC_VER |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 213 | void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 214 | { |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 215 | void *near_ptr; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 216 | void FAR *far_ptr; |
| 217 | FP_OFF(near_ptr) = FP_OFF(ptr); |
| 218 | far_ptr = (void FAR *)near_ptr; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 219 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 220 | if (check != 0) |
| 221 | if (FP_SEG(ptr) != FP_SEG(far_ptr)) |
| 222 | png_error(png_ptr, "segment lost in conversion"); |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 223 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 224 | return(near_ptr); |
| 225 | } |
| 226 | # else |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 227 | void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 228 | { |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 229 | void *near_ptr; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 230 | void FAR *far_ptr; |
| 231 | near_ptr = (void FAR *)ptr; |
| 232 | far_ptr = (void FAR *)near_ptr; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 233 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 234 | if (check != 0) |
| 235 | if (far_ptr != ptr) |
| 236 | png_error(png_ptr, "segment lost in conversion"); |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 237 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 238 | return(near_ptr); |
| 239 | } |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame^] | 240 | # endif |
| 241 | #endif |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 242 | #endif /* PNG_WRITE_SUPPORTED */ |