Subversion Repositories Kolibri OS

Rev

Rev 1897 | Go to most recent revision | Show entire file | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 1897 Rev 3928
Line 1... Line 1...
1 
/* pngrio.c - functions for data input
 1 
/* pngrio.c - functions for data input
2 
 *
 2 
 *
3 
 * Last changed in libpng 1.5.0 [January 6, 2011]
 3 
 * Last changed in libpng 1.6.0 [February 14, 2013]
4 
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 4 
 * Copyright (c) 1998-2013 Glenn Randers-Pehrson
5 
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 5 
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
6 
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 6 
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
7 
 *
 7 
 *
8 
 * This code is released under the libpng license.
 8 
 * This code is released under the libpng license.
9 
 * For conditions of distribution and use, see the disclaimer
 9 
 * For conditions of distribution and use, see the disclaimer
Line 27... Line 27...
27 
 * buffering if you are using unbuffered reads.  This should never be asked
 27 
 * buffering if you are using unbuffered reads.  This should never be asked
28 
 * to read more then 64K on a 16 bit machine.
 28 
 * to read more then 64K on a 16 bit machine.
29 
 */
 29 
 */
30 
void /* PRIVATE */
 30 
void /* PRIVATE */
31 
png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 31 
png_read_data(png_structrp png_ptr, png_bytep data, png_size_t length)
32 
{
 32 
{
33 
   png_debug1(4, "reading %d bytes", (int)length);
 33 
   png_debug1(4, "reading %d bytes", (int)length);
34 
 
 34 
 
Line 35... Line 35...
35 
   if (png_ptr->read_data_fn != NULL)
 35 
   if (png_ptr->read_data_fn != NULL)
36 
      (*(png_ptr->read_data_fn))(png_ptr, data, length);
 36 
      (*(png_ptr->read_data_fn))(png_ptr, data, length);
Line 44... Line 44...
44 
 * not reading from a standard C stream, you should create a replacement
 44 
 * not reading from a standard C stream, you should create a replacement
45 
 * read_data function and use it at run time with png_set_read_fn(), rather
 45 
 * read_data function and use it at run time with png_set_read_fn(), rather
46 
 * than changing the library.
 46 
 * than changing the library.
47 
 */
 47 
 */
48 
#  ifndef USE_FAR_KEYWORD
 48 
void PNGCBAPI
49 
void PNGCBAPI
 - 
 
50 
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 49 
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
51 
{
 50 
{
52 
   png_size_t check;
 51 
   png_size_t check;
53 
 
 52 
 
Line 56... Line 55...
56 
 
 55 
 
Line 57... Line 56...
57 
   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
 56 
   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
58 
    * instead of an int, which is what fread() actually returns.
 57 
    * instead of an int, which is what fread() actually returns.
59 
    */
 58 
    */
60 
   check = fread(data, 1, length, (png_FILE_p)png_ptr->io_ptr);
 59 
   check = fread(data, 1, length, png_voidcast(png_FILE_p, png_ptr->io_ptr));
Line 61... Line 60...
61 
 
 60 
 
62 
   if (check != length)
 61 
   if (check != length)
63 
      png_error(png_ptr, "Read Error");
 62 
      png_error(png_ptr, "Read Error");
64 
}
 - 
 
65 
#  else
 - 
 
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 
*/
 - 
 
70 
 
 - 
 
71 
#define NEAR_BUF_SIZE 1024
 - 
 
72 
#define MIN(a,b) (a <= b ? a : b)
 - 
 
73 
 
 - 
 
74 
static void PNGCBAPI
 - 
 
75 
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 - 
 
76 
{
 - 
 
77 
   png_size_t check;
 - 
 
78 
   png_byte *n_data;
 - 
 
79 
   png_FILE_p io_ptr;
 - 
 
80 
 
 - 
 
81 
   if (png_ptr == NULL)
 - 
 
82 
      return;
 - 
 
83 
 
 - 
 
84 
   /* Check if data really is near. If so, use usual code. */
 - 
 
85 
   n_data = (png_byte *)CVT_PTR_NOCHECK(data);
 - 
 
86 
   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
 - 
 
87 
 
 - 
 
88 
   if ((png_bytep)n_data == data)
 - 
 
89 
   {
 - 
 
90 
      check = fread(n_data, 1, length, io_ptr);
 - 
 
91 
   }
 - 
 
92 
 
 - 
 
93 
   else
 - 
 
94 
   {
 - 
 
95 
      png_byte buf[NEAR_BUF_SIZE];
 - 
 
96 
      png_size_t read, remaining, err;
 - 
 
97 
      check = 0;
 - 
 
98 
      remaining = length;
 - 
 
99 
 
 - 
 
100 
      do
 - 
 
101 
      {
 - 
 
102 
         read = MIN(NEAR_BUF_SIZE, remaining);
 - 
 
103 
         err = fread(buf, 1, read, io_ptr);
 - 
 
104 
         png_memcpy(data, buf, read); /* copy far buffer to near buffer */
 - 
 
105 
 
 - 
 
106 
         if (err != read)
 - 
 
107 
            break;
 - 
 
108 
 
 - 
 
109 
         else
 - 
 
110 
            check += err;
 - 
 
111 
 
 - 
 
112 
         data += read;
 - 
 
113 
         remaining -= read;
 - 
 
114 
      }
 - 
 
115 
      while (remaining != 0);
 - 
 
116 
   }
 - 
 
117 
 
 - 
 
118 
   if ((png_uint_32)check != (png_uint_32)length)
 - 
 
119 
      png_error(png_ptr, "read Error");
 - 
 
120 
}
 - 
 
121 
#  endif
 63 
}
Line 122... Line 64...
122 
#endif
 64 
#endif
123 
 
 65 
 
124 
/* This function allows the application to supply a new input function
 66 
/* This function allows the application to supply a new input function
Line 140... Line 82...
140 
 *                May be NULL, in which case libpng's default function will
 82 
 *                May be NULL, in which case libpng's default function will
141 
 *                be used.
 83 
 *                be used.
142 
 */
 84 
 */
143 
void PNGAPI
 85 
void PNGAPI
144 
png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
 86 
png_set_read_fn(png_structrp png_ptr, png_voidp io_ptr,
145 
   png_rw_ptr read_data_fn)
 87 
   png_rw_ptr read_data_fn)
146 
{
 88 
{
147 
   if (png_ptr == NULL)
 89 
   if (png_ptr == NULL)
148 
      return;
 90 
      return;
149 
 
 91