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annotate ext/libpng-1.2.29/pngrio.c @ 357:2cdce58c1109

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Fixes the scroll areas in the pychan demo. fixes[t:363]
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 25 Sep 2009 19:48:07 +0000
parents 4a0efb7baf70
children
rev   line source
0
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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1
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2 /* pngrio.c - functions for data input
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3 *
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4 * Last changed in libpng 1.2.13 November 13, 2006
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5 * For conditions of distribution and use, see copyright notice in png.h
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6 * Copyright (c) 1998-2006 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 file provides a location for all input. Users who need
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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11 * special handling are expected to write a function that has the same
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12 * arguments as this and performs a similar function, but that possibly
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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13 * has a different input method. Note that you shouldn't change this
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14 * function, but rather write a replacement function and then make
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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15 * libpng use it at run time with png_set_read_fn(...).
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16 */
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17
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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18 #define PNG_INTERNAL
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19 #include "png.h"
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20
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21 #if defined(PNG_READ_SUPPORTED)
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22
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23 /* Read the data from whatever input you are using. The default routine
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24 reads from a file pointer. Note that this routine sometimes gets called
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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25 with very small lengths, so you should implement some kind of simple
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26 buffering if you are using unbuffered reads. This should never be asked
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27 to read more then 64K on a 16 bit machine. */
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28 void /* PRIVATE */
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29 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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30 {
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31 png_debug1(4,"reading %d bytes\n", (int)length);
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32 if (png_ptr->read_data_fn != NULL)
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33 (*(png_ptr->read_data_fn))(png_ptr, data, length);
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34 else
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35 png_error(png_ptr, "Call to NULL read function");
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36 }
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37
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38 #if !defined(PNG_NO_STDIO)
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39 /* This is the function that does the actual reading of data. If you are
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40 not reading from a standard C stream, you should create a replacement
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41 read_data function and use it at run time with png_set_read_fn(), rather
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42 than changing the library. */
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43 #ifndef USE_FAR_KEYWORD
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44 void PNGAPI
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45 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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46 {
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47 png_size_t check;
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48
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49 if(png_ptr == NULL) return;
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50 /* fread() returns 0 on error, so it is OK to store this in a png_size_t
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51 * instead of an int, which is what fread() actually returns.
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52 */
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53 #if defined(_WIN32_WCE)
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54 if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
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55 check = 0;
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56 #else
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57 check = (png_size_t)fread(data, (png_size_t)1, length,
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58 (png_FILE_p)png_ptr->io_ptr);
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59 #endif
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60
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61 if (check != length)
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62 png_error(png_ptr, "Read Error");
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63 }
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64 #else
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65 /* this is the model-independent version. Since the standard I/O library
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66 can't handle far buffers in the medium and small models, we have to copy
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67 the data.
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68 */
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69
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70 #define NEAR_BUF_SIZE 1024
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71 #define MIN(a,b) (a <= b ? a : b)
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72
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73 static void PNGAPI
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74 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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75 {
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76 int check;
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77 png_byte *n_data;
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78 png_FILE_p io_ptr;
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79
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80 if(png_ptr == NULL) return;
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81 /* Check if data really is near. If so, use usual code. */
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82 n_data = (png_byte *)CVT_PTR_NOCHECK(data);
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83 io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
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84 if ((png_bytep)n_data == data)
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85 {
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86 #if defined(_WIN32_WCE)
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87 if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
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88 check = 0;
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89 #else
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90 check = fread(n_data, 1, length, io_ptr);
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91 #endif
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92 }
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93 else
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94 {
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95 png_byte buf[NEAR_BUF_SIZE];
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96 png_size_t read, remaining, err;
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97 check = 0;
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98 remaining = length;
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99 do
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100 {
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101 read = MIN(NEAR_BUF_SIZE, remaining);
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102 #if defined(_WIN32_WCE)
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103 if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
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104 err = 0;
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105 #else
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106 err = fread(buf, (png_size_t)1, read, io_ptr);
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107 #endif
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108 png_memcpy(data, buf, read); /* copy far buffer to near buffer */
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109 if(err != read)
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110 break;
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111 else
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112 check += err;
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113 data += read;
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114 remaining -= read;
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115 }
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116 while (remaining != 0);
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117 }
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118 if ((png_uint_32)check != (png_uint_32)length)
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119 png_error(png_ptr, "read Error");
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120 }
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121 #endif
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122 #endif
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123
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124 /* This function allows the application to supply a new input function
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125 for libpng if standard C streams aren't being used.
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126
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127 This function takes as its arguments:
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128 png_ptr - pointer to a png input data structure
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129 io_ptr - pointer to user supplied structure containing info about
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130 the input functions. May be NULL.
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131 read_data_fn - pointer to a new input function that takes as its
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132 arguments a pointer to a png_struct, a pointer to
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133 a location where input data can be stored, and a 32-bit
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134 unsigned int that is the number of bytes to be read.
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135 To exit and output any fatal error messages the new write
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136 function should call png_error(png_ptr, "Error msg"). */
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137 void PNGAPI
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138 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
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139 png_rw_ptr read_data_fn)
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140 {
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141 if(png_ptr == NULL) return;
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142 png_ptr->io_ptr = io_ptr;
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143
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144 #if !defined(PNG_NO_STDIO)
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145 if (read_data_fn != NULL)
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146 png_ptr->read_data_fn = read_data_fn;
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147 else
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148 png_ptr->read_data_fn = png_default_read_data;
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149 #else
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150 png_ptr->read_data_fn = read_data_fn;
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151 #endif
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152
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153 /* It is an error to write to a read device */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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154 if (png_ptr->write_data_fn != NULL)
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155 {
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156 png_ptr->write_data_fn = NULL;
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157 png_warning(png_ptr,
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158 "It's an error to set both read_data_fn and write_data_fn in the ");
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159 png_warning(png_ptr,
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160 "same structure. Resetting write_data_fn to NULL.");
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161 }
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162
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163 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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164 png_ptr->output_flush_fn = NULL;
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165 #endif
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166 }
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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167 #endif /* PNG_READ_SUPPORTED */