The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngwio.c - functions for data output |
| 3 | * |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 4 | * Last changed in libpng 1.2.41 [December 3, 2009] |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 5 | * Copyright (c) 1998-2009 Glenn Randers-Pehrson |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [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.) |
| 8 | * |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
| 12 | * |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [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 |
| 17 | * functions, but rather write replacement functions and then change |
| 18 | * them at run time with png_set_write_fn(...). |
| 19 | */ |
| 20 | |
| 21 | #define PNG_INTERNAL |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 22 | #define PNG_NO_PEDANTIC_WARNINGS |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 23 | #include "png.h" |
| 24 | #ifdef PNG_WRITE_SUPPORTED |
| 25 | |
| 26 | /* Write the data to whatever output you are using. The default routine |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 27 | * writes to a file pointer. Note that this routine sometimes gets called |
| 28 | * with very small lengths, so you should implement some kind of simple |
| 29 | * buffering if you are using unbuffered writes. This should never be asked |
| 30 | * to write more than 64K on a 16 bit machine. |
| 31 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 32 | |
| 33 | void /* PRIVATE */ |
| 34 | png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) |
| 35 | { |
| 36 | if (png_ptr->write_data_fn != NULL ) |
| 37 | (*(png_ptr->write_data_fn))(png_ptr, data, length); |
| 38 | else |
| 39 | png_error(png_ptr, "Call to NULL write function"); |
| 40 | } |
| 41 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 42 | #ifdef PNG_STDIO_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 43 | /* This is the function that does the actual writing of data. If you are |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 44 | * not writing to a standard C stream, you should create a replacement |
| 45 | * write_data function and use it at run time with png_set_write_fn(), rather |
| 46 | * than changing the library. |
| 47 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 48 | #ifndef USE_FAR_KEYWORD |
| 49 | void PNGAPI |
| 50 | png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) |
| 51 | { |
| 52 | png_uint_32 check; |
| 53 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 54 | if (png_ptr == NULL) |
| 55 | return; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 56 | #ifdef _WIN32_WCE |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 57 | if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) ) |
| 58 | check = 0; |
| 59 | #else |
| 60 | check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr)); |
| 61 | #endif |
| 62 | if (check != length) |
| 63 | png_error(png_ptr, "Write Error"); |
| 64 | } |
| 65 | #else |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 66 | /* This is the model-independent version. Since the standard I/O library |
| 67 | * can't handle far buffers in the medium and small models, we have to copy |
| 68 | * the data. |
| 69 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 70 | |
| 71 | #define NEAR_BUF_SIZE 1024 |
| 72 | #define MIN(a,b) (a <= b ? a : b) |
| 73 | |
| 74 | void PNGAPI |
| 75 | png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) |
| 76 | { |
| 77 | png_uint_32 check; |
| 78 | png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */ |
| 79 | png_FILE_p io_ptr; |
| 80 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 81 | if (png_ptr == NULL) |
| 82 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 83 | /* Check if data really is near. If so, use usual code. */ |
| 84 | near_data = (png_byte *)CVT_PTR_NOCHECK(data); |
| 85 | io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); |
| 86 | if ((png_bytep)near_data == data) |
| 87 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 88 | #ifdef _WIN32_WCE |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 89 | if ( !WriteFile(io_ptr, near_data, length, &check, NULL) ) |
| 90 | check = 0; |
| 91 | #else |
| 92 | check = fwrite(near_data, 1, length, io_ptr); |
| 93 | #endif |
| 94 | } |
| 95 | else |
| 96 | { |
| 97 | png_byte buf[NEAR_BUF_SIZE]; |
| 98 | png_size_t written, remaining, err; |
| 99 | check = 0; |
| 100 | remaining = length; |
| 101 | do |
| 102 | { |
| 103 | written = MIN(NEAR_BUF_SIZE, remaining); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 104 | png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 105 | #ifdef _WIN32_WCE |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 106 | if ( !WriteFile(io_ptr, buf, written, &err, NULL) ) |
| 107 | err = 0; |
| 108 | #else |
| 109 | err = fwrite(buf, 1, written, io_ptr); |
| 110 | #endif |
| 111 | if (err != written) |
| 112 | break; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 113 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 114 | else |
| 115 | check += err; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 116 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 117 | data += written; |
| 118 | remaining -= written; |
| 119 | } |
| 120 | while (remaining != 0); |
| 121 | } |
| 122 | if (check != length) |
| 123 | png_error(png_ptr, "Write Error"); |
| 124 | } |
| 125 | |
| 126 | #endif |
| 127 | #endif |
| 128 | |
| 129 | /* This function is called to output any data pending writing (normally |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 130 | * to disk). After png_flush is called, there should be no data pending |
| 131 | * writing in any buffers. |
| 132 | */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 133 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 134 | void /* PRIVATE */ |
| 135 | png_flush(png_structp png_ptr) |
| 136 | { |
| 137 | if (png_ptr->output_flush_fn != NULL) |
| 138 | (*(png_ptr->output_flush_fn))(png_ptr); |
| 139 | } |
| 140 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 141 | #ifdef PNG_STDIO_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 142 | void PNGAPI |
| 143 | png_default_flush(png_structp png_ptr) |
| 144 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 145 | #ifndef _WIN32_WCE |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 146 | png_FILE_p io_ptr; |
| 147 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 148 | if (png_ptr == NULL) |
| 149 | return; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 150 | #ifndef _WIN32_WCE |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 151 | io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 152 | fflush(io_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 153 | #endif |
| 154 | } |
| 155 | #endif |
| 156 | #endif |
| 157 | |
| 158 | /* This function allows the application to supply new output functions for |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 159 | * libpng if standard C streams aren't being used. |
| 160 | * |
| 161 | * This function takes as its arguments: |
| 162 | * png_ptr - pointer to a png output data structure |
| 163 | * io_ptr - pointer to user supplied structure containing info about |
| 164 | * the output functions. May be NULL. |
| 165 | * write_data_fn - pointer to a new output function that takes as its |
| 166 | * arguments a pointer to a png_struct, a pointer to |
| 167 | * data to be written, and a 32-bit unsigned int that is |
| 168 | * the number of bytes to be written. The new write |
| 169 | * function should call png_error(png_ptr, "Error msg") |
| 170 | * to exit and output any fatal error messages. May be |
| 171 | * NULL, in which case libpng's default function will |
| 172 | * be used. |
| 173 | * flush_data_fn - pointer to a new flush function that takes as its |
| 174 | * arguments a pointer to a png_struct. After a call to |
| 175 | * the flush function, there should be no data in any buffers |
| 176 | * or pending transmission. If the output method doesn't do |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 177 | * any buffering of output, a function prototype must still be |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 178 | * supplied although it doesn't have to do anything. If |
| 179 | * PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile |
| 180 | * time, output_flush_fn will be ignored, although it must be |
| 181 | * supplied for compatibility. May be NULL, in which case |
| 182 | * libpng's default function will be used, if |
| 183 | * PNG_WRITE_FLUSH_SUPPORTED is defined. This is not |
| 184 | * a good idea if io_ptr does not point to a standard |
| 185 | * *FILE structure. |
| 186 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 187 | void PNGAPI |
| 188 | png_set_write_fn(png_structp png_ptr, png_voidp io_ptr, |
| 189 | png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn) |
| 190 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 191 | if (png_ptr == NULL) |
| 192 | return; |
| 193 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 194 | png_ptr->io_ptr = io_ptr; |
| 195 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 196 | #ifdef PNG_STDIO_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 197 | if (write_data_fn != NULL) |
| 198 | png_ptr->write_data_fn = write_data_fn; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 199 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 200 | else |
| 201 | png_ptr->write_data_fn = png_default_write_data; |
| 202 | #else |
| 203 | png_ptr->write_data_fn = write_data_fn; |
| 204 | #endif |
| 205 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 206 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| 207 | #ifdef PNG_STDIO_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 208 | if (output_flush_fn != NULL) |
| 209 | png_ptr->output_flush_fn = output_flush_fn; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 210 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 211 | else |
| 212 | png_ptr->output_flush_fn = png_default_flush; |
| 213 | #else |
| 214 | png_ptr->output_flush_fn = output_flush_fn; |
| 215 | #endif |
| 216 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| 217 | |
| 218 | /* It is an error to read while writing a png file */ |
| 219 | if (png_ptr->read_data_fn != NULL) |
| 220 | { |
| 221 | png_ptr->read_data_fn = NULL; |
| 222 | png_warning(png_ptr, |
| 223 | "Attempted to set both read_data_fn and write_data_fn in"); |
| 224 | png_warning(png_ptr, |
| 225 | "the same structure. Resetting read_data_fn to NULL."); |
| 226 | } |
| 227 | } |
| 228 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame^] | 229 | #ifdef USE_FAR_KEYWORD |
| 230 | #ifdef _MSC_VER |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 231 | void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 232 | { |
| 233 | void *near_ptr; |
| 234 | void FAR *far_ptr; |
| 235 | FP_OFF(near_ptr) = FP_OFF(ptr); |
| 236 | far_ptr = (void FAR *)near_ptr; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 237 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 238 | if (check != 0) |
| 239 | if (FP_SEG(ptr) != FP_SEG(far_ptr)) |
| 240 | png_error(png_ptr, "segment lost in conversion"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 241 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 242 | return(near_ptr); |
| 243 | } |
| 244 | # else |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 245 | void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 246 | { |
| 247 | void *near_ptr; |
| 248 | void FAR *far_ptr; |
| 249 | near_ptr = (void FAR *)ptr; |
| 250 | far_ptr = (void FAR *)near_ptr; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 251 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 252 | if (check != 0) |
| 253 | if (far_ptr != ptr) |
| 254 | png_error(png_ptr, "segment lost in conversion"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 255 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 256 | return(near_ptr); |
| 257 | } |
| 258 | # endif |
| 259 | # endif |
| 260 | #endif /* PNG_WRITE_SUPPORTED */ |