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 | f5ea1b7 | 2011-01-06 06:42:51 -0600 | [diff] [blame] | 4 | * Last changed in libpng 1.5.0 [January 6, 2011] |
Glenn Randers-Pehrson | 64b863c | 2011-01-04 09:57:06 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2011 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 | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 21 | #include "pngpriv.h" |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 22 | |
Glenn Randers-Pehrson | c3cd22b | 2010-03-08 21:10:25 -0600 | [diff] [blame] | 23 | #ifdef PNG_WRITE_SUPPORTED |
| 24 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 25 | /* 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] | 26 | * writes to a file pointer. Note that this routine sometimes gets called |
| 27 | * with very small lengths, so you should implement some kind of simple |
| 28 | * buffering if you are using unbuffered writes. This should never be asked |
| 29 | * to write more than 64K on a 16 bit machine. |
| 30 | */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 31 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 32 | void /* PRIVATE */ |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 33 | png_write_data(png_structp png_ptr, png_const_bytep data, png_size_t length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 34 | { |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 35 | /* NOTE: write_data_fn must not change the buffer! */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 36 | if (png_ptr->write_data_fn != NULL ) |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 37 | (*(png_ptr->write_data_fn))(png_ptr, (png_bytep)data, length); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 38 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 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 | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 50 | void PNGCBAPI |
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 | { |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 53 | png_size_t check; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 54 | |
Glenn Randers-Pehrson | d8eb62f | 2009-05-30 20:19:20 -0500 | [diff] [blame] | 55 | if (png_ptr == NULL) |
| 56 | return; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 57 | |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 58 | check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 59 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 60 | if (check != length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 61 | png_error(png_ptr, "Write Error"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 62 | } |
| 63 | #else |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 64 | /* This is the model-independent version. Since the standard I/O library |
| 65 | * can't handle far buffers in the medium and small models, we have to copy |
| 66 | * the data. |
| 67 | */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 68 | |
| 69 | #define NEAR_BUF_SIZE 1024 |
| 70 | #define MIN(a,b) (a <= b ? a : b) |
| 71 | |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 72 | void PNGCBAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 73 | 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] | 74 | { |
| 75 | png_uint_32 check; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 76 | 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] | 77 | png_FILE_p io_ptr; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 78 | |
Glenn Randers-Pehrson | d8eb62f | 2009-05-30 20:19:20 -0500 | [diff] [blame] | 79 | if (png_ptr == NULL) |
| 80 | return; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 81 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 82 | /* Check if data really is near. If so, use usual code. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 83 | near_data = (png_byte *)CVT_PTR_NOCHECK(data); |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 84 | io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 85 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 86 | if ((png_bytep)near_data == data) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 87 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 88 | check = fwrite(near_data, 1, length, io_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 89 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 90 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 91 | else |
| 92 | { |
| 93 | png_byte buf[NEAR_BUF_SIZE]; |
| 94 | png_size_t written, remaining, err; |
| 95 | check = 0; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 96 | remaining = length; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 97 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 98 | do |
| 99 | { |
| 100 | written = MIN(NEAR_BUF_SIZE, remaining); |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 101 | png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 102 | err = fwrite(buf, 1, written, io_ptr); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 103 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 104 | if (err != written) |
| 105 | break; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 106 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 107 | else |
| 108 | check += err; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 109 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 110 | data += written; |
| 111 | remaining -= written; |
| 112 | } |
| 113 | while (remaining != 0); |
| 114 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 115 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 116 | if (check != length) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 117 | png_error(png_ptr, "Write Error"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | #endif |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 121 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 122 | |
| 123 | /* 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] | 124 | * to disk). After png_flush is called, there should be no data pending |
| 125 | * writing in any buffers. |
| 126 | */ |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 127 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 128 | void /* PRIVATE */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 129 | png_flush(png_structp png_ptr) |
| 130 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 131 | if (png_ptr->output_flush_fn != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 132 | (*(png_ptr->output_flush_fn))(png_ptr); |
| 133 | } |
| 134 | |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame] | 135 | # ifdef PNG_STDIO_SUPPORTED |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 136 | void PNGCBAPI |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 137 | png_default_flush(png_structp png_ptr) |
| 138 | { |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 139 | png_FILE_p io_ptr; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 140 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 141 | if (png_ptr == NULL) |
| 142 | return; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 143 | |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 144 | io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr)); |
Glenn Randers-Pehrson | 8fb550c | 2009-03-21 08:15:32 -0500 | [diff] [blame] | 145 | fflush(io_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 146 | } |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame] | 147 | # endif |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 148 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 149 | |
| 150 | /* 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] | 151 | * libpng if standard C streams aren't being used. |
| 152 | * |
| 153 | * This function takes as its arguments: |
| 154 | * png_ptr - pointer to a png output data structure |
| 155 | * io_ptr - pointer to user supplied structure containing info about |
| 156 | * the output functions. May be NULL. |
| 157 | * write_data_fn - pointer to a new output function that takes as its |
| 158 | * arguments a pointer to a png_struct, a pointer to |
| 159 | * data to be written, and a 32-bit unsigned int that is |
| 160 | * the number of bytes to be written. The new write |
| 161 | * function should call png_error(png_ptr, "Error msg") |
| 162 | * to exit and output any fatal error messages. May be |
| 163 | * NULL, in which case libpng's default function will |
| 164 | * be used. |
| 165 | * flush_data_fn - pointer to a new flush function that takes as its |
| 166 | * arguments a pointer to a png_struct. After a call to |
| 167 | * the flush function, there should be no data in any buffers |
| 168 | * or pending transmission. If the output method doesn't do |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 169 | * any buffering of output, a function prototype must still be |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 170 | * supplied although it doesn't have to do anything. If |
| 171 | * PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile |
| 172 | * time, output_flush_fn will be ignored, although it must be |
| 173 | * supplied for compatibility. May be NULL, in which case |
| 174 | * libpng's default function will be used, if |
| 175 | * PNG_WRITE_FLUSH_SUPPORTED is defined. This is not |
| 176 | * a good idea if io_ptr does not point to a standard |
| 177 | * *FILE structure. |
| 178 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 179 | void PNGAPI |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 180 | 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] | 181 | png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 182 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 183 | if (png_ptr == NULL) |
| 184 | return; |
| 185 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 186 | png_ptr->io_ptr = io_ptr; |
| 187 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 188 | #ifdef PNG_STDIO_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 189 | if (write_data_fn != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 190 | png_ptr->write_data_fn = write_data_fn; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 191 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 192 | else |
Glenn Randers-Pehrson | 25d8224 | 2002-05-01 11:51:26 -0500 | [diff] [blame] | 193 | png_ptr->write_data_fn = png_default_write_data; |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 194 | #else |
| 195 | png_ptr->write_data_fn = write_data_fn; |
| 196 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 197 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 198 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame] | 199 | # ifdef PNG_STDIO_SUPPORTED |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 200 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 201 | if (output_flush_fn != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 202 | png_ptr->output_flush_fn = output_flush_fn; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 203 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 204 | else |
Glenn Randers-Pehrson | 25d8224 | 2002-05-01 11:51:26 -0500 | [diff] [blame] | 205 | png_ptr->output_flush_fn = png_default_flush; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 206 | |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame] | 207 | # else |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 208 | png_ptr->output_flush_fn = output_flush_fn; |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame] | 209 | # endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 210 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| 211 | |
| 212 | /* It is an error to read while writing a png file */ |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 213 | if (png_ptr->read_data_fn != NULL) |
| 214 | { |
| 215 | png_ptr->read_data_fn = NULL; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 216 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 217 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 92a3ef4 | 2010-03-31 21:50:21 -0500 | [diff] [blame] | 218 | "Can't set both read_data_fn and write_data_fn in the" |
| 219 | " same structure"); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 220 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 221 | } |
| 222 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 223 | #ifdef USE_FAR_KEYWORD |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame] | 224 | # ifdef _MSC_VER |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 225 | 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] | 226 | { |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 227 | void *near_ptr; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 228 | void FAR *far_ptr; |
| 229 | FP_OFF(near_ptr) = FP_OFF(ptr); |
| 230 | far_ptr = (void FAR *)near_ptr; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 231 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 232 | if (check != 0) |
| 233 | if (FP_SEG(ptr) != FP_SEG(far_ptr)) |
| 234 | png_error(png_ptr, "segment lost in conversion"); |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 235 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 236 | return(near_ptr); |
| 237 | } |
| 238 | # else |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 239 | 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] | 240 | { |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 241 | void *near_ptr; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 242 | void FAR *far_ptr; |
| 243 | near_ptr = (void FAR *)ptr; |
| 244 | far_ptr = (void FAR *)near_ptr; |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 245 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 246 | if (check != 0) |
| 247 | if (far_ptr != ptr) |
| 248 | png_error(png_ptr, "segment lost in conversion"); |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 249 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 250 | return(near_ptr); |
| 251 | } |
Glenn Randers-Pehrson | 6f6a91a | 2010-03-06 13:54:59 -0600 | [diff] [blame] | 252 | # endif |
| 253 | #endif |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 254 | #endif /* PNG_WRITE_SUPPORTED */ |