LCOV - code coverage report
Current view: directory - media/libpng - pngmem.c (source / functions) Found Hit Coverage
Test: app.info Lines: 38 29 76.3 %
Date: 2012-06-02 Functions: 6 5 83.3 %

       1                 : 
       2                 : /* pngmem.c - stub functions for memory allocation
       3                 :  *
       4                 :  * Last changed in libpng 1.5.7 [December 15, 2011]
       5                 :  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
       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                 :  *
       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                 :  *
      13                 :  * This file provides a location for all memory allocation.  Users who
      14                 :  * need special memory handling are expected to supply replacement
      15                 :  * functions for png_malloc() and png_free(), and to use
      16                 :  * png_create_read_struct_2() and png_create_write_struct_2() to
      17                 :  * identify the replacement functions.
      18                 :  */
      19                 : 
      20                 : #include "pngpriv.h"
      21                 : 
      22                 : #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
      23                 : 
      24                 : /* Borland DOS special memory handler */
      25                 : #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
      26                 : /* If you change this, be sure to change the one in png.h also */
      27                 : 
      28                 : /* Allocate memory for a png_struct.  The malloc and memset can be replaced
      29                 :    by a single call to calloc() if this is thought to improve performance. */
      30                 : PNG_FUNCTION(png_voidp /* PRIVATE */,
      31                 : png_create_struct,(int type),PNG_ALLOCATED)
      32                 : {
      33                 : #  ifdef PNG_USER_MEM_SUPPORTED
      34                 :    return (png_create_struct_2(type, NULL, NULL));
      35                 : }
      36                 : 
      37                 : /* Alternate version of png_create_struct, for use with user-defined malloc. */
      38                 : PNG_FUNCTION(png_voidp /* PRIVATE */,
      39                 : png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
      40                 :    PNG_ALLOCATED)
      41                 : {
      42                 : #  endif /* PNG_USER_MEM_SUPPORTED */
      43                 :    png_size_t size;
      44                 :    png_voidp struct_ptr;
      45                 : 
      46                 :    if (type == PNG_STRUCT_INFO)
      47                 :       size = png_sizeof(png_info);
      48                 : 
      49                 :    else if (type == PNG_STRUCT_PNG)
      50                 :       size = png_sizeof(png_struct);
      51                 : 
      52                 :    else
      53                 :       return (png_get_copyright(NULL));
      54                 : 
      55                 : #  ifdef PNG_USER_MEM_SUPPORTED
      56                 :    if (malloc_fn != NULL)
      57                 :    {
      58                 :       png_struct dummy_struct;
      59                 :       memset(&dummy_struct, 0, sizeof dummy_struct);
      60                 :       dummy_struct.mem_ptr=mem_ptr;
      61                 :       struct_ptr = (*(malloc_fn))(&dummy_struct, (png_alloc_size_t)size);
      62                 :    }
      63                 : 
      64                 :    else
      65                 : #  endif /* PNG_USER_MEM_SUPPORTED */
      66                 :    struct_ptr = (png_voidp)farmalloc(size);
      67                 :    if (struct_ptr != NULL)
      68                 :       png_memset(struct_ptr, 0, size);
      69                 : 
      70                 :    return (struct_ptr);
      71                 : }
      72                 : 
      73                 : /* Free memory allocated by a png_create_struct() call */
      74                 : void /* PRIVATE */
      75                 : png_destroy_struct(png_voidp struct_ptr)
      76                 : {
      77                 : #  ifdef PNG_USER_MEM_SUPPORTED
      78                 :    png_destroy_struct_2(struct_ptr, NULL, NULL);
      79                 : }
      80                 : 
      81                 : /* Free memory allocated by a png_create_struct() call */
      82                 : void /* PRIVATE */
      83                 : png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
      84                 :     png_voidp mem_ptr)
      85                 : {
      86                 : #  endif
      87                 :    if (struct_ptr != NULL)
      88                 :    {
      89                 : #  ifdef PNG_USER_MEM_SUPPORTED
      90                 :       if (free_fn != NULL)
      91                 :       {
      92                 :          png_struct dummy_struct;
      93                 :          memset(&dummy_struct, 0, sizeof dummy_struct);
      94                 :          dummy_struct.mem_ptr=mem_ptr;
      95                 :          (*(free_fn))(&dummy_struct, struct_ptr);
      96                 :          return;
      97                 :       }
      98                 : 
      99                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     100                 :       farfree (struct_ptr);
     101                 :    }
     102                 : }
     103                 : 
     104                 : /* Allocate memory.  For reasonable files, size should never exceed
     105                 :  * 64K.  However, zlib may allocate more then 64K if you don't tell
     106                 :  * it not to.  See zconf.h and png.h for more information. zlib does
     107                 :  * need to allocate exactly 64K, so whatever you call here must
     108                 :  * have the ability to do that.
     109                 :  *
     110                 :  * Borland seems to have a problem in DOS mode for exactly 64K.
     111                 :  * It gives you a segment with an offset of 8 (perhaps to store its
     112                 :  * memory stuff).  zlib doesn't like this at all, so we have to
     113                 :  * detect and deal with it.  This code should not be needed in
     114                 :  * Windows or OS/2 modes, and only in 16 bit mode.  This code has
     115                 :  * been updated by Alexander Lehmann for version 0.89 to waste less
     116                 :  * memory.
     117                 :  *
     118                 :  * Note that we can't use png_size_t for the "size" declaration,
     119                 :  * since on some systems a png_size_t is a 16-bit quantity, and as a
     120                 :  * result, we would be truncating potentially larger memory requests
     121                 :  * (which should cause a fatal error) and introducing major problems.
     122                 :  */
     123                 : PNG_FUNCTION(png_voidp,PNGAPI
     124                 : png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
     125                 : {
     126                 :    png_voidp ret;
     127                 : 
     128                 :    ret = (png_malloc(png_ptr, size));
     129                 : 
     130                 :    if (ret != NULL)
     131                 :       png_memset(ret,0,(png_size_t)size);
     132                 : 
     133                 :    return (ret);
     134                 : }
     135                 : 
     136                 : PNG_FUNCTION(png_voidp,PNGAPI
     137                 : png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
     138                 : {
     139                 :    png_voidp ret;
     140                 : 
     141                 :    if (png_ptr == NULL || size == 0)
     142                 :       return (NULL);
     143                 : 
     144                 : #  ifdef PNG_USER_MEM_SUPPORTED
     145                 :    if (png_ptr->malloc_fn != NULL)
     146                 :       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
     147                 : 
     148                 :    else
     149                 :       ret = (png_malloc_default(png_ptr, size));
     150                 : 
     151                 :    if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     152                 :        png_error(png_ptr, "Out of memory");
     153                 : 
     154                 :    return (ret);
     155                 : }
     156                 : 
     157                 : PNG_FUNCTION(png_voidp,PNGAPI
     158                 : png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
     159                 : {
     160                 :    png_voidp ret;
     161                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     162                 : 
     163                 :    if (png_ptr == NULL || size == 0)
     164                 :       return (NULL);
     165                 : 
     166                 : #  ifdef PNG_MAX_MALLOC_64K
     167                 :    if (size > (png_uint_32)65536L)
     168                 :    {
     169                 :       png_warning(png_ptr, "Cannot Allocate > 64K");
     170                 :       ret = NULL;
     171                 :    }
     172                 : 
     173                 :    else
     174                 : #  endif
     175                 : 
     176                 :    if (size != (size_t)size)
     177                 :       ret = NULL;
     178                 : 
     179                 :    else if (size == (png_uint_32)65536L)
     180                 :    {
     181                 :       if (png_ptr->offset_table == NULL)
     182                 :       {
     183                 :          /* Try to see if we need to do any of this fancy stuff */
     184                 :          ret = farmalloc(size);
     185                 :          if (ret == NULL || ((png_size_t)ret & 0xffff))
     186                 :          {
     187                 :             int num_blocks;
     188                 :             png_uint_32 total_size;
     189                 :             png_bytep table;
     190                 :             int i, mem_level, window_bits;
     191                 :             png_byte huge * hptr;
     192                 :             int window_bits
     193                 : 
     194                 :             if (ret != NULL)
     195                 :             {
     196                 :                farfree(ret);
     197                 :                ret = NULL;
     198                 :             }
     199                 : 
     200                 :             window_bits =
     201                 :                 png_ptr->zlib_window_bits >= png_ptr->zlib_text_window_bits ?
     202                 :                 png_ptr->zlib_window_bits : png_ptr->zlib_text_window_bits;
     203                 : 
     204                 :             if (window_bits > 14)
     205                 :                num_blocks = (int)(1 << (window_bits - 14));
     206                 : 
     207                 :             else
     208                 :                num_blocks = 1;
     209                 : 
     210                 :             mem_level =
     211                 :                 png_ptr->zlib_mem_level >= png_ptr->zlib_text_mem_level ?
     212                 :                 png_ptr->zlib_mem_level : png_ptr->zlib_text_mem_level;
     213                 : 
     214                 :             if (mem_level >= 7)
     215                 :                num_blocks += (int)(1 << (mem_level - 7));
     216                 : 
     217                 :             else
     218                 :                num_blocks++;
     219                 : 
     220                 :             total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
     221                 : 
     222                 :             table = farmalloc(total_size);
     223                 : 
     224                 :             if (table == NULL)
     225                 :             {
     226                 : #  ifndef PNG_USER_MEM_SUPPORTED
     227                 :                if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     228                 :                   png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */
     229                 : 
     230                 :                else
     231                 :                   png_warning(png_ptr, "Out Of Memory");
     232                 : #  endif
     233                 :                return (NULL);
     234                 :             }
     235                 : 
     236                 :             if ((png_size_t)table & 0xfff0)
     237                 :             {
     238                 : #  ifndef PNG_USER_MEM_SUPPORTED
     239                 :                if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     240                 :                   png_error(png_ptr,
     241                 :                     "Farmalloc didn't return normalized pointer");
     242                 : 
     243                 :                else
     244                 :                   png_warning(png_ptr,
     245                 :                     "Farmalloc didn't return normalized pointer");
     246                 : #  endif
     247                 :                return (NULL);
     248                 :             }
     249                 : 
     250                 :             png_ptr->offset_table = table;
     251                 :             png_ptr->offset_table_ptr = farmalloc(num_blocks *
     252                 :                png_sizeof(png_bytep));
     253                 : 
     254                 :             if (png_ptr->offset_table_ptr == NULL)
     255                 :             {
     256                 : #  ifndef PNG_USER_MEM_SUPPORTED
     257                 :                if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     258                 :                   png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */
     259                 : 
     260                 :                else
     261                 :                   png_warning(png_ptr, "Out Of memory");
     262                 : #  endif
     263                 :                return (NULL);
     264                 :             }
     265                 : 
     266                 :             hptr = (png_byte huge *)table;
     267                 :             if ((png_size_t)hptr & 0xf)
     268                 :             {
     269                 :                hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
     270                 :                hptr = hptr + 16L;  /* "hptr += 16L" fails on Turbo C++ 3.0 */
     271                 :             }
     272                 : 
     273                 :             for (i = 0; i < num_blocks; i++)
     274                 :             {
     275                 :                png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
     276                 :                hptr = hptr + (png_uint_32)65536L;  /* "+=" fails on TC++3.0 */
     277                 :             }
     278                 : 
     279                 :             png_ptr->offset_table_number = num_blocks;
     280                 :             png_ptr->offset_table_count = 0;
     281                 :             png_ptr->offset_table_count_free = 0;
     282                 :          }
     283                 :       }
     284                 : 
     285                 :       if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
     286                 :       {
     287                 : #  ifndef PNG_USER_MEM_SUPPORTED
     288                 :          if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     289                 :             png_error(png_ptr, "Out of Memory"); /* Note "O" and "M" */
     290                 : 
     291                 :          else
     292                 :             png_warning(png_ptr, "Out of Memory");
     293                 : #  endif
     294                 :          return (NULL);
     295                 :       }
     296                 : 
     297                 :       ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
     298                 :    }
     299                 : 
     300                 :    else
     301                 :       ret = farmalloc(size);
     302                 : 
     303                 : #  ifndef PNG_USER_MEM_SUPPORTED
     304                 :    if (ret == NULL)
     305                 :    {
     306                 :       if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     307                 :          png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */
     308                 : 
     309                 :       else
     310                 :          png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */
     311                 :    }
     312                 : #  endif
     313                 : 
     314                 :    return (ret);
     315                 : }
     316                 : 
     317                 : /* Free a pointer allocated by png_malloc().  In the default
     318                 :  * configuration, png_ptr is not used, but is passed in case it
     319                 :  * is needed.  If ptr is NULL, return without taking any action.
     320                 :  */
     321                 : void PNGAPI
     322                 : png_free(png_structp png_ptr, png_voidp ptr)
     323                 : {
     324                 :    if (png_ptr == NULL || ptr == NULL)
     325                 :       return;
     326                 : 
     327                 : #  ifdef PNG_USER_MEM_SUPPORTED
     328                 :    if (png_ptr->free_fn != NULL)
     329                 :    {
     330                 :       (*(png_ptr->free_fn))(png_ptr, ptr);
     331                 :       return;
     332                 :    }
     333                 : 
     334                 :    else
     335                 :       png_free_default(png_ptr, ptr);
     336                 : }
     337                 : 
     338                 : void PNGAPI
     339                 : png_free_default(png_structp png_ptr, png_voidp ptr)
     340                 : {
     341                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     342                 : 
     343                 :    if (png_ptr == NULL || ptr == NULL)
     344                 :       return;
     345                 : 
     346                 :    if (png_ptr->offset_table != NULL)
     347                 :    {
     348                 :       int i;
     349                 : 
     350                 :       for (i = 0; i < png_ptr->offset_table_count; i++)
     351                 :       {
     352                 :          if (ptr == png_ptr->offset_table_ptr[i])
     353                 :          {
     354                 :             ptr = NULL;
     355                 :             png_ptr->offset_table_count_free++;
     356                 :             break;
     357                 :          }
     358                 :       }
     359                 :       if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
     360                 :       {
     361                 :          farfree(png_ptr->offset_table);
     362                 :          farfree(png_ptr->offset_table_ptr);
     363                 :          png_ptr->offset_table = NULL;
     364                 :          png_ptr->offset_table_ptr = NULL;
     365                 :       }
     366                 :    }
     367                 : 
     368                 :    if (ptr != NULL)
     369                 :       farfree(ptr);
     370                 : }
     371                 : 
     372                 : #else /* Not the Borland DOS special memory handler */
     373                 : 
     374                 : /* Allocate memory for a png_struct or a png_info.  The malloc and
     375                 :    memset can be replaced by a single call to calloc() if this is thought
     376                 :    to improve performance noticably. */
     377              60 : PNG_FUNCTION(png_voidp /* PRIVATE */,
     378                 : png_create_struct,(int type),PNG_ALLOCATED)
     379                 : {
     380                 : #  ifdef PNG_USER_MEM_SUPPORTED
     381                 :    return (png_create_struct_2(type, NULL, NULL));
     382                 : }
     383                 : 
     384                 : /* Allocate memory for a png_struct or a png_info.  The malloc and
     385                 :    memset can be replaced by a single call to calloc() if this is thought
     386                 :    to improve performance noticably. */
     387                 : PNG_FUNCTION(png_voidp /* PRIVATE */,
     388                 : png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
     389                 :    PNG_ALLOCATED)
     390                 : {
     391                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     392                 :    png_size_t size;
     393                 :    png_voidp struct_ptr;
     394                 : 
     395              60 :    if (type == PNG_STRUCT_INFO)
     396              30 :       size = png_sizeof(png_info);
     397                 : 
     398              30 :    else if (type == PNG_STRUCT_PNG)
     399              30 :       size = png_sizeof(png_struct);
     400                 : 
     401                 :    else
     402               0 :       return (NULL);
     403                 : 
     404                 : #  ifdef PNG_USER_MEM_SUPPORTED
     405                 :    if (malloc_fn != NULL)
     406                 :    {
     407                 :       png_struct dummy_struct;
     408                 :       png_structp png_ptr = &dummy_struct;
     409                 :       png_ptr->mem_ptr=mem_ptr;
     410                 :       struct_ptr = (*(malloc_fn))(png_ptr, size);
     411                 : 
     412                 :       if (struct_ptr != NULL)
     413                 :          png_memset(struct_ptr, 0, size);
     414                 : 
     415                 :       return (struct_ptr);
     416                 :    }
     417                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     418                 : 
     419                 : #  if defined(__TURBOC__) && !defined(__FLAT__)
     420                 :    struct_ptr = (png_voidp)farmalloc(size);
     421                 : #  else
     422                 : #    if defined(_MSC_VER) && defined(MAXSEG_64K)
     423                 :    struct_ptr = (png_voidp)halloc(size, 1);
     424                 : #    else
     425              60 :    struct_ptr = (png_voidp)malloc(size);
     426                 : #    endif
     427                 : #  endif
     428                 : 
     429              60 :    if (struct_ptr != NULL)
     430              60 :       png_memset(struct_ptr, 0, size);
     431                 : 
     432              60 :    return (struct_ptr);
     433                 : }
     434                 : 
     435                 : 
     436                 : /* Free memory allocated by a png_create_struct() call */
     437                 : void /* PRIVATE */
     438              60 : png_destroy_struct(png_voidp struct_ptr)
     439                 : {
     440                 : #  ifdef PNG_USER_MEM_SUPPORTED
     441                 :    png_destroy_struct_2(struct_ptr, NULL, NULL);
     442                 : }
     443                 : 
     444                 : /* Free memory allocated by a png_create_struct() call */
     445                 : void /* PRIVATE */
     446                 : png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
     447                 :     png_voidp mem_ptr)
     448                 : {
     449                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     450              60 :    if (struct_ptr != NULL)
     451                 :    {
     452                 : #  ifdef PNG_USER_MEM_SUPPORTED
     453                 :       if (free_fn != NULL)
     454                 :       {
     455                 :          png_struct dummy_struct;
     456                 :          png_structp png_ptr = &dummy_struct;
     457                 :          png_ptr->mem_ptr=mem_ptr;
     458                 :          (*(free_fn))(png_ptr, struct_ptr);
     459                 :          return;
     460                 :       }
     461                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     462                 : #  if defined(__TURBOC__) && !defined(__FLAT__)
     463                 :       farfree(struct_ptr);
     464                 : 
     465                 : #  else
     466                 : #    if defined(_MSC_VER) && defined(MAXSEG_64K)
     467                 :       hfree(struct_ptr);
     468                 : 
     469                 : #    else
     470              60 :       free(struct_ptr);
     471                 : 
     472                 : #    endif
     473                 : #  endif
     474                 :    }
     475              60 : }
     476                 : 
     477                 : /* Allocate memory.  For reasonable files, size should never exceed
     478                 :  * 64K.  However, zlib may allocate more then 64K if you don't tell
     479                 :  * it not to.  See zconf.h and png.h for more information.  zlib does
     480                 :  * need to allocate exactly 64K, so whatever you call here must
     481                 :  * have the ability to do that.
     482                 :  */
     483                 : 
     484               0 : PNG_FUNCTION(png_voidp,PNGAPI
     485                 : png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
     486                 : {
     487                 :    png_voidp ret;
     488                 : 
     489               0 :    ret = (png_malloc(png_ptr, size));
     490                 : 
     491               0 :    if (ret != NULL)
     492               0 :       png_memset(ret,0,(png_size_t)size);
     493                 : 
     494               0 :    return (ret);
     495                 : }
     496                 : 
     497             215 : PNG_FUNCTION(png_voidp,PNGAPI
     498                 : png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
     499                 : {
     500                 :    png_voidp ret;
     501                 : 
     502                 : #  ifdef PNG_USER_MEM_SUPPORTED
     503                 :    if (png_ptr == NULL || size == 0)
     504                 :       return (NULL);
     505                 : 
     506                 :    if (png_ptr->malloc_fn != NULL)
     507                 :       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
     508                 : 
     509                 :    else
     510                 :       ret = (png_malloc_default(png_ptr, size));
     511                 : 
     512                 :    if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     513                 :        png_error(png_ptr, "Out of Memory");
     514                 : 
     515                 :    return (ret);
     516                 : }
     517                 : 
     518                 : PNG_FUNCTION(png_voidp,PNGAPI
     519                 : png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
     520                 : {
     521                 :    png_voidp ret;
     522                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     523                 : 
     524             215 :    if (png_ptr == NULL || size == 0)
     525               0 :       return (NULL);
     526                 : 
     527                 : #  ifdef PNG_MAX_MALLOC_64K
     528                 :    if (size > (png_uint_32)65536L)
     529                 :    {
     530                 : #    ifndef PNG_USER_MEM_SUPPORTED
     531                 :       if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     532                 :          png_error(png_ptr, "Cannot Allocate > 64K");
     533                 : 
     534                 :       else
     535                 : #    endif
     536                 :          return NULL;
     537                 :    }
     538                 : #  endif
     539                 : 
     540                 :    /* Check for overflow */
     541                 : #  if defined(__TURBOC__) && !defined(__FLAT__)
     542                 : 
     543                 :    if (size != (unsigned long)size)
     544                 :       ret = NULL;
     545                 : 
     546                 :    else
     547                 :       ret = farmalloc(size);
     548                 : 
     549                 : #  else
     550                 : #    if defined(_MSC_VER) && defined(MAXSEG_64K)
     551                 :    if (size != (unsigned long)size)
     552                 :       ret = NULL;
     553                 : 
     554                 :    else
     555                 :       ret = halloc(size, 1);
     556                 : 
     557                 : #    else
     558                 :    if (size != (size_t)size)
     559                 :       ret = NULL;
     560                 : 
     561                 :    else
     562             215 :       ret = malloc((size_t)size);
     563                 : #    endif
     564                 : #  endif
     565                 : 
     566                 : #  ifndef PNG_USER_MEM_SUPPORTED
     567             215 :    if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
     568               0 :       png_error(png_ptr, "Out of Memory");
     569                 : #  endif
     570                 : 
     571             215 :    return (ret);
     572                 : }
     573                 : 
     574                 : /* Free a pointer allocated by png_malloc().  If ptr is NULL, return
     575                 :  * without taking any action.
     576                 :  */
     577                 : void PNGAPI
     578             226 : png_free(png_structp png_ptr, png_voidp ptr)
     579                 : {
     580             226 :    if (png_ptr == NULL || ptr == NULL)
     581              24 :       return;
     582                 : 
     583                 : #  ifdef PNG_USER_MEM_SUPPORTED
     584                 :    if (png_ptr->free_fn != NULL)
     585                 :    {
     586                 :       (*(png_ptr->free_fn))(png_ptr, ptr);
     587                 :       return;
     588                 :    }
     589                 : 
     590                 :    else
     591                 :       png_free_default(png_ptr, ptr);
     592                 : }
     593                 : 
     594                 : void PNGAPI
     595                 : png_free_default(png_structp png_ptr, png_voidp ptr)
     596                 : {
     597                 :    if (png_ptr == NULL || ptr == NULL)
     598                 :       return;
     599                 : 
     600                 : #  endif /* PNG_USER_MEM_SUPPORTED */
     601                 : 
     602                 : #  if defined(__TURBOC__) && !defined(__FLAT__)
     603                 :    farfree(ptr);
     604                 : 
     605                 : #  else
     606                 : #    if defined(_MSC_VER) && defined(MAXSEG_64K)
     607                 :    hfree(ptr);
     608                 : 
     609                 : #    else
     610             202 :    free(ptr);
     611                 : 
     612                 : #    endif
     613                 : #  endif
     614                 : }
     615                 : #endif /* Not Borland DOS special memory handler */
     616                 : 
     617                 : /* This function was added at libpng version 1.2.3.  The png_malloc_warn()
     618                 :  * function will set up png_malloc() to issue a png_warning and return NULL
     619                 :  * instead of issuing a png_error, if it fails to allocate the requested
     620                 :  * memory.
     621                 :  */
     622              30 : PNG_FUNCTION(png_voidp,PNGAPI
     623                 : png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
     624                 : {
     625                 :    png_voidp ptr;
     626                 :    png_uint_32 save_flags;
     627              30 :    if (png_ptr == NULL)
     628               0 :       return (NULL);
     629                 : 
     630              30 :    save_flags = png_ptr->flags;
     631              30 :    png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
     632              30 :    ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
     633              30 :    png_ptr->flags=save_flags;
     634              30 :    return(ptr);
     635                 : }
     636                 : 
     637                 : 
     638                 : #ifdef PNG_USER_MEM_SUPPORTED
     639                 : /* This function is called when the application wants to use another method
     640                 :  * of allocating and freeing memory.
     641                 :  */
     642                 : void PNGAPI
     643                 : png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
     644                 :   malloc_fn, png_free_ptr free_fn)
     645                 : {
     646                 :    if (png_ptr != NULL)
     647                 :    {
     648                 :       png_ptr->mem_ptr = mem_ptr;
     649                 :       png_ptr->malloc_fn = malloc_fn;
     650                 :       png_ptr->free_fn = free_fn;
     651                 :    }
     652                 : }
     653                 : 
     654                 : /* This function returns a pointer to the mem_ptr associated with the user
     655                 :  * functions.  The application should free any memory associated with this
     656                 :  * pointer before png_write_destroy and png_read_destroy are called.
     657                 :  */
     658                 : png_voidp PNGAPI
     659                 : png_get_mem_ptr(png_const_structp png_ptr)
     660                 : {
     661                 :    if (png_ptr == NULL)
     662                 :       return (NULL);
     663                 : 
     664                 :    return ((png_voidp)png_ptr->mem_ptr);
     665                 : }
     666                 : #endif /* PNG_USER_MEM_SUPPORTED */
     667                 : #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

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