/src/giflib-code/gifalloc.c

Source (jump to first uncovered line)
/*****************************************************************************

 GIF construction tools

****************************************************************************/
// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: Copyright (C) Eric S. Raymond <esr@thyrsus.com>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "gif_lib.h"
#include "gif_lib_private.h"

#define MAX(x, y) (((x) > (y)) ? (x) : (y))

/******************************************************************************
 Miscellaneous utility functions
******************************************************************************/

/* return smallest bitfield size n will fit in */
int GifBitSize(int n) {
  register int i;

  for (i = 1; i <= 8; i++) {
    if ((1 << i) >= n) {
      break;
    }
  }
  return (i);
}

/******************************************************************************
 Color map object functions
******************************************************************************/

/*
 * Allocate a color map of given size; initialize with contents of
 * ColorMap if that pointer is non-NULL.
 */
ColorMapObject *GifMakeMapObject(int ColorCount, const GifColorType *ColorMap) {
  ColorMapObject *Object;

  /*** FIXME: Our ColorCount has to be a power of two.  Is it necessary to
   * make the user know that or should we automatically round up instead?
   */
  if (ColorCount != (1 << GifBitSize(ColorCount))) {
    return ((ColorMapObject *)NULL);
  }

  Object = (ColorMapObject *)malloc(sizeof(ColorMapObject));
  if (Object == (ColorMapObject *)NULL) {
    return ((ColorMapObject *)NULL);
  }

  Object->Colors =
      (GifColorType *)calloc(ColorCount, sizeof(GifColorType));
  if (Object->Colors == (GifColorType *)NULL) {
    free(Object);
    return ((ColorMapObject *)NULL);
  }

  Object->ColorCount = ColorCount;
  Object->BitsPerPixel = GifBitSize(ColorCount);
  Object->SortFlag = false;

  if (ColorMap != NULL) {
    memcpy((char *)Object->Colors, (char *)ColorMap,
           ColorCount * sizeof(GifColorType));
  }

  return (Object);
}

/*******************************************************************************
 Free a color map object
*******************************************************************************/
void GifFreeMapObject(ColorMapObject *Object) {
  if (Object != NULL) {
    (void)free(Object->Colors);
    (void)free(Object);
  }
}

#ifdef DEBUG
void DumpColorMap(ColorMapObject *Object, FILE *fp) {
  if (Object != NULL) {
    int i, j, Len = Object->ColorCount;

    for (i = 0; i < Len; i += 4) {
      for (j = 0; j < 4 && j < Len; j++) {
        (void)fprintf(fp, "%3d: %02x %02x %02x   ",
                      i + j, Object->Colors[i + j].Red,
                      Object->Colors[i + j].Green,
                      Object->Colors[i + j].Blue);
      }
      (void)fprintf(fp, "\n");
    }
  }
}
#endif /* DEBUG */

/*******************************************************************************
 Compute the union of two given color maps and return it.  If result can't
 fit into 256 colors, NULL is returned, the allocated union otherwise.
 ColorIn1 is copied as is to ColorUnion, while colors from ColorIn2 are
 copied iff they didn't exist before.  ColorTransIn2 maps the old
 ColorIn2 into the ColorUnion color map table./
*******************************************************************************/
ColorMapObject *GifUnionColorMap(const ColorMapObject *ColorIn1,
                                 const ColorMapObject *ColorIn2,
                                 GifPixelType ColorTransIn2[]) {
  int i, j, CrntSlot, RoundUpTo, NewGifBitSize;
  ColorMapObject *ColorUnion;

  /*
   * We don't worry about duplicates within either color map; if
   * the caller wants to resolve those, he can perform unions
   * with an empty color map.
   */

  /* Allocate table which will hold the result for sure. */
  ColorUnion = GifMakeMapObject(
      MAX(ColorIn1->ColorCount, ColorIn2->ColorCount) * 2, NULL);

  if (ColorUnion == NULL) {
    return (NULL);
  }

  /*
   * Copy ColorIn1 to ColorUnion.
   */
  for (i = 0; i < ColorIn1->ColorCount; i++) {
    ColorUnion->Colors[i] = ColorIn1->Colors[i];
  }
  CrntSlot = ColorIn1->ColorCount;

  /*
   * Potentially obnoxious hack:
   *
   * Back CrntSlot down past all contiguous {0, 0, 0} slots at the end
   * of table 1.  This is very useful if your display is limited to
   * 16 colors.
   */
  while (ColorIn1->Colors[CrntSlot - 1].Red == 0 &&
         ColorIn1->Colors[CrntSlot - 1].Green == 0 &&
         ColorIn1->Colors[CrntSlot - 1].Blue == 0) {
    CrntSlot--;
  }

  /* Copy ColorIn2 to ColorUnion (use old colors if they exist): */
  for (i = 0; i < ColorIn2->ColorCount && CrntSlot <= 256; i++) {
    /* Let's see if this color already exists: */
    for (j = 0; j < ColorIn1->ColorCount; j++) {
      if (memcmp(&ColorIn1->Colors[j], &ColorIn2->Colors[i],
                 sizeof(GifColorType)) == 0) {
        break;
      }
    }

    if (j < ColorIn1->ColorCount) {
      ColorTransIn2[i] = j; /* color exists in Color1 */
    } else {
      /* Color is new - copy it to a new slot: */
      ColorUnion->Colors[CrntSlot] = ColorIn2->Colors[i];
      ColorTransIn2[i] = CrntSlot++;
    }
  }

  if (CrntSlot > 256) {
    GifFreeMapObject(ColorUnion);
    return ((ColorMapObject *)NULL);
  }

  NewGifBitSize = GifBitSize(CrntSlot);
  RoundUpTo = (1 << NewGifBitSize);

  if (RoundUpTo != ColorUnion->ColorCount) {
    register GifColorType *Map = ColorUnion->Colors;

    /*
     * Zero out slots up to next power of 2.
     * We know these slots exist because of the way ColorUnion's
     * start dimension was computed.
     */
    for (j = CrntSlot; j < RoundUpTo; j++) {
      Map[j].Red = Map[j].Green = Map[j].Blue = 0;
    }

    /* perhaps we can shrink the map? */
    if (RoundUpTo < ColorUnion->ColorCount) {
      GifColorType *new_map = (GifColorType *)reallocarray(
          Map, RoundUpTo, sizeof(GifColorType));
      if (new_map == NULL) {
        GifFreeMapObject(ColorUnion);
        return ((ColorMapObject *)NULL);
      }
      ColorUnion->Colors = new_map;
    }
  }

  ColorUnion->ColorCount = RoundUpTo;
  ColorUnion->BitsPerPixel = NewGifBitSize;

  return (ColorUnion);
}

/*******************************************************************************
 Apply a given color translation to the raster bits of an image
*******************************************************************************/
void GifApplyTranslation(SavedImage *Image, const GifPixelType Translation[]) {
  register int i;
  register int RasterSize =
      Image->ImageDesc.Height * Image->ImageDesc.Width;

  for (i = 0; i < RasterSize; i++) {
    Image->RasterBits[i] = Translation[Image->RasterBits[i]];
  }
}

/******************************************************************************
 Extension record functions
******************************************************************************/
int GifAddExtensionBlock(int *ExtensionBlockCount,
                         ExtensionBlock **ExtensionBlocks, int Function,
                         unsigned int Len, unsigned char ExtData[]) {
  ExtensionBlock *ep;

  if (*ExtensionBlocks == NULL) {
    *ExtensionBlocks =
        (ExtensionBlock *)malloc(sizeof(ExtensionBlock));
  } else {
    ExtensionBlock *ep_new = (ExtensionBlock *)reallocarray(
        *ExtensionBlocks, (*ExtensionBlockCount + 1),
        sizeof(ExtensionBlock));
    if (ep_new == NULL) {
      return (GIF_ERROR);
    }
    *ExtensionBlocks = ep_new;
  }

  if (*ExtensionBlocks == NULL) {
    return (GIF_ERROR);
  }

  ep = &(*ExtensionBlocks)[(*ExtensionBlockCount)++];

  ep->Function = Function;
  ep->ByteCount = Len;
  ep->Bytes = (GifByteType *)malloc(ep->ByteCount);
  if (ep->Bytes == NULL) {
    return (GIF_ERROR);
  }

  if (ExtData != NULL) {
    memcpy(ep->Bytes, ExtData, Len);
  }

  return (GIF_OK);
}

void GifFreeExtensions(int *ExtensionBlockCount,
                       ExtensionBlock **ExtensionBlocks) {
  ExtensionBlock *ep;

  if (*ExtensionBlocks == NULL) {
    return;
  }

  for (ep = *ExtensionBlocks;
       ep < (*ExtensionBlocks + *ExtensionBlockCount); ep++) {
    (void)free((char *)ep->Bytes);
  }
  (void)free((char *)*ExtensionBlocks);
  *ExtensionBlocks = NULL;
  *ExtensionBlockCount = 0;
}

/******************************************************************************
   Image block allocation functions
******************************************************************************/

/* Private Function:
 * Frees the last image in the GifFile->SavedImages array
 */
void FreeLastSavedImage(GifFileType *GifFile) {
  SavedImage *sp;

  if ((GifFile == NULL) || (GifFile->SavedImages == NULL)) {
    return;
  }

  /* Remove one SavedImage from the GifFile */
  GifFile->ImageCount--;
  sp = &GifFile->SavedImages[GifFile->ImageCount];

  /* Deallocate its Colormap */
  if (sp->ImageDesc.ColorMap != NULL) {
    GifFreeMapObject(sp->ImageDesc.ColorMap);
    sp->ImageDesc.ColorMap = NULL;
  }

  /* Deallocate the image data */
  if (sp->RasterBits != NULL) {
    free((char *)sp->RasterBits);
  }

  /* Deallocate any extensions */
  GifFreeExtensions(&sp->ExtensionBlockCount, &sp->ExtensionBlocks);

  /*** FIXME: We could realloc the GifFile->SavedImages structure but is
   * there a point to it? Saves some memory but we'd have to do it every
   * time.  If this is used in GifFreeSavedImages then it would be
   * inefficient (The whole array is going to be deallocated.)  If we just
   * use it when we want to free the last Image it's convenient to do it
   * here.
   */
}

/*
 * Append an image block to the SavedImages array
 */
SavedImage *GifMakeSavedImage(GifFileType *GifFile,
                              const SavedImage *CopyFrom) {
  // cppcheck-suppress ctunullpointer
  if (GifFile->SavedImages == NULL) {
    GifFile->SavedImages = (SavedImage *)malloc(sizeof(SavedImage));
  } else {
    SavedImage *newSavedImages = (SavedImage *)reallocarray(
        GifFile->SavedImages, (GifFile->ImageCount + 1),
        sizeof(SavedImage));
    if (newSavedImages == NULL) {
      return ((SavedImage *)NULL);
    }
    GifFile->SavedImages = newSavedImages;
  }
  if (GifFile->SavedImages == NULL) {
    return ((SavedImage *)NULL);
  } else {
    SavedImage *sp = &GifFile->SavedImages[GifFile->ImageCount++];

    if (CopyFrom != NULL) {
      memcpy((char *)sp, CopyFrom, sizeof(SavedImage));

      /*
       * Make our own allocated copies of the heap fields in
       * the copied record.  This guards against potential
       * aliasing problems.
       */

      /* first, the local color map */
      if (CopyFrom->ImageDesc.ColorMap != NULL) {
        sp->ImageDesc.ColorMap = GifMakeMapObject(
            CopyFrom->ImageDesc.ColorMap->ColorCount,
            CopyFrom->ImageDesc.ColorMap->Colors);
        if (sp->ImageDesc.ColorMap == NULL) {
          FreeLastSavedImage(GifFile);
          return (SavedImage *)(NULL);
        }
      }

      /* next, the raster */
      sp->RasterBits = (unsigned char *)reallocarray(
          NULL,
          (CopyFrom->ImageDesc.Height *
           CopyFrom->ImageDesc.Width),
          sizeof(GifPixelType));
      if (sp->RasterBits == NULL) {
        FreeLastSavedImage(GifFile);
        return (SavedImage *)(NULL);
      }
      memcpy(sp->RasterBits, CopyFrom->RasterBits,
             sizeof(GifPixelType) *
                 CopyFrom->ImageDesc.Height *
                 CopyFrom->ImageDesc.Width);

      /* finally, the extension blocks */
      if (CopyFrom->ExtensionBlocks != NULL) {
        sp->ExtensionBlocks =
            (ExtensionBlock *)reallocarray(
                NULL, CopyFrom->ExtensionBlockCount,
                sizeof(ExtensionBlock));
        if (sp->ExtensionBlocks == NULL) {
          FreeLastSavedImage(GifFile);
          return (SavedImage *)(NULL);
        }
        memcpy(sp->ExtensionBlocks,
               CopyFrom->ExtensionBlocks,
               sizeof(ExtensionBlock) *
                   CopyFrom->ExtensionBlockCount);
      }
    } else {
      memset((char *)sp, '\0', sizeof(SavedImage));
    }

    return (sp);
  }
}

void GifFreeSavedImages(GifFileType *GifFile) {
  SavedImage *sp;

  if ((GifFile == NULL) || (GifFile->SavedImages == NULL)) {
    return;
  }
  for (sp = GifFile->SavedImages;
       sp < GifFile->SavedImages + GifFile->ImageCount; sp++) {
    if (sp->ImageDesc.ColorMap != NULL) {
      GifFreeMapObject(sp->ImageDesc.ColorMap);
      sp->ImageDesc.ColorMap = NULL;
    }

    if (sp->RasterBits != NULL) {
      free((char *)sp->RasterBits);
    }

    GifFreeExtensions(&sp->ExtensionBlockCount,
                      &sp->ExtensionBlocks);
  }
  free((char *)GifFile->SavedImages);
  GifFile->SavedImages = NULL;
}

/* end */

Coverage Report

Created: 2025-06-13 06:08

Line	Count	Source (jump to first uncovered line)
1		/*****************************************************************************
2
3		GIF construction tools
4
5		****************************************************************************/
6		// SPDX-License-Identifier: MIT
7		// SPDX-FileCopyrightText: Copyright (C) Eric S. Raymond <esr@thyrsus.com>
8
9		#include <stdio.h>
10		#include <stdlib.h>
11		#include <string.h>
12
13		#include "gif_lib.h"
14		#include "gif_lib_private.h"
15
16	0	#define MAX(x, y) (((x) > (y)) ? (x) : (y))
17
18		/******************************************************************************
19		Miscellaneous utility functions
20		******************************************************************************/
21
22		/* return smallest bitfield size n will fit in */
23	1.40k	int GifBitSize(int n) {
24	1.40k	register int i;
25
26	11.2k	for (i = 1; i <= 8; i++) {
27	11.2k	if ((1 << i) >= n) {
28	1.40k	break;
29	1.40k	}
30	11.2k	}
31	1.40k	return (i);
32	1.40k	}
33
34		/******************************************************************************
35		Color map object functions
36		******************************************************************************/
37
38		/*
39		* Allocate a color map of given size; initialize with contents of
40		* ColorMap if that pointer is non-NULL.
41		*/
42	700	ColorMapObject GifMakeMapObject(int ColorCount, const GifColorType ColorMap) {
43	700	ColorMapObject *Object;
44
45		/*** FIXME: Our ColorCount has to be a power of two. Is it necessary to
46		* make the user know that or should we automatically round up instead?
47		*/
48	700	if (ColorCount != (1 << GifBitSize(ColorCount))) {
49	0	return ((ColorMapObject *)NULL);
50	0	}
51
52	700	Object = (ColorMapObject *)malloc(sizeof(ColorMapObject));
53	700	if (Object == (ColorMapObject *)NULL) {
54	0	return ((ColorMapObject *)NULL);
55	0	}
56
57	700	Object->Colors =
58	700	(GifColorType *)calloc(ColorCount, sizeof(GifColorType));
59	700	if (Object->Colors == (GifColorType *)NULL) {
60	0	free(Object);
61	0	return ((ColorMapObject *)NULL);
62	0	}
63
64	700	Object->ColorCount = ColorCount;
65	700	Object->BitsPerPixel = GifBitSize(ColorCount);
66	700	Object->SortFlag = false;
67
68	700	if (ColorMap != NULL) {
69	350	memcpy((char )Object->Colors, (char )ColorMap,
70	350	ColorCount * sizeof(GifColorType));
71	350	}
72
73	700	return (Object);
74	700	}
75
76		/*******************************************************************************
77		Free a color map object
78		*******************************************************************************/
79	700	void GifFreeMapObject(ColorMapObject *Object) {
80	700	if (Object != NULL) {
81	700	(void)free(Object->Colors);
82	700	(void)free(Object);
83	700	}
84	700	}
85
86		#ifdef DEBUG
87		void DumpColorMap(ColorMapObject Object, FILE fp) {
88		if (Object != NULL) {
89		int i, j, Len = Object->ColorCount;
90
91		for (i = 0; i < Len; i += 4) {
92		for (j = 0; j < 4 && j < Len; j++) {
93		(void)fprintf(fp, "%3d: %02x %02x %02x ",
94		i + j, Object->Colors[i + j].Red,
95		Object->Colors[i + j].Green,
96		Object->Colors[i + j].Blue);
97		}
98		(void)fprintf(fp, "\n");
99		}
100		}
101		}
102		#endif /* DEBUG */
103
104		/*******************************************************************************
105		Compute the union of two given color maps and return it. If result can't
106		fit into 256 colors, NULL is returned, the allocated union otherwise.
107		ColorIn1 is copied as is to ColorUnion, while colors from ColorIn2 are
108		copied iff they didn't exist before. ColorTransIn2 maps the old
109		ColorIn2 into the ColorUnion color map table./
110		*******************************************************************************/
111		ColorMapObject GifUnionColorMap(const ColorMapObject ColorIn1,
112		const ColorMapObject *ColorIn2,
113	0	GifPixelType ColorTransIn2[]) {
114	0	int i, j, CrntSlot, RoundUpTo, NewGifBitSize;
115	0	ColorMapObject *ColorUnion;
116
117		/*
118		* We don't worry about duplicates within either color map; if
119		* the caller wants to resolve those, he can perform unions
120		* with an empty color map.
121		*/
122
123		/* Allocate table which will hold the result for sure. */
124	0	ColorUnion = GifMakeMapObject(
125	0	MAX(ColorIn1->ColorCount, ColorIn2->ColorCount) * 2, NULL);
126
127	0	if (ColorUnion == NULL) {
128	0	return (NULL);
129	0	}
130
131		/*
132		* Copy ColorIn1 to ColorUnion.
133		*/
134	0	for (i = 0; i < ColorIn1->ColorCount; i++) {
135	0	ColorUnion->Colors[i] = ColorIn1->Colors[i];
136	0	}
137	0	CrntSlot = ColorIn1->ColorCount;
138
139		/*
140		* Potentially obnoxious hack:
141		*
142		* Back CrntSlot down past all contiguous {0, 0, 0} slots at the end
143		* of table 1. This is very useful if your display is limited to
144		* 16 colors.
145		*/
146	0	while (ColorIn1->Colors[CrntSlot - 1].Red == 0 &&
147	0	ColorIn1->Colors[CrntSlot - 1].Green == 0 &&
148	0	ColorIn1->Colors[CrntSlot - 1].Blue == 0) {
149	0	CrntSlot--;
150	0	}
151
152		/* Copy ColorIn2 to ColorUnion (use old colors if they exist): */
153	0	for (i = 0; i < ColorIn2->ColorCount && CrntSlot <= 256; i++) {
154		/* Let's see if this color already exists: */
155	0	for (j = 0; j < ColorIn1->ColorCount; j++) {
156	0	if (memcmp(&ColorIn1->Colors[j], &ColorIn2->Colors[i],
157	0	sizeof(GifColorType)) == 0) {
158	0	break;
159	0	}
160	0	}
161
162	0	if (j < ColorIn1->ColorCount) {
163	0	ColorTransIn2[i] = j; /* color exists in Color1 */
164	0	} else {
165		/* Color is new - copy it to a new slot: */
166	0	ColorUnion->Colors[CrntSlot] = ColorIn2->Colors[i];
167	0	ColorTransIn2[i] = CrntSlot++;
168	0	}
169	0	}
170
171	0	if (CrntSlot > 256) {
172	0	GifFreeMapObject(ColorUnion);
173	0	return ((ColorMapObject *)NULL);
174	0	}
175
176	0	NewGifBitSize = GifBitSize(CrntSlot);
177	0	RoundUpTo = (1 << NewGifBitSize);
178
179	0	if (RoundUpTo != ColorUnion->ColorCount) {
180	0	register GifColorType *Map = ColorUnion->Colors;
181
182		/*
183		* Zero out slots up to next power of 2.
184		* We know these slots exist because of the way ColorUnion's
185		* start dimension was computed.
186		*/
187	0	for (j = CrntSlot; j < RoundUpTo; j++) {
188	0	Map[j].Red = Map[j].Green = Map[j].Blue = 0;
189	0	}
190
191		/* perhaps we can shrink the map? */
192	0	if (RoundUpTo < ColorUnion->ColorCount) {
193	0	GifColorType new_map = (GifColorType )reallocarray(
194	0	Map, RoundUpTo, sizeof(GifColorType));
195	0	if (new_map == NULL) {
196	0	GifFreeMapObject(ColorUnion);
197	0	return ((ColorMapObject *)NULL);
198	0	}
199	0	ColorUnion->Colors = new_map;
200	0	}
201	0	}
202
203	0	ColorUnion->ColorCount = RoundUpTo;
204	0	ColorUnion->BitsPerPixel = NewGifBitSize;
205
206	0	return (ColorUnion);
207	0	}
208
209		/*******************************************************************************
210		Apply a given color translation to the raster bits of an image
211		*******************************************************************************/
212	0	void GifApplyTranslation(SavedImage *Image, const GifPixelType Translation[]) {
213	0	register int i;
214	0	register int RasterSize =
215	0	Image->ImageDesc.Height * Image->ImageDesc.Width;
216
217	0	for (i = 0; i < RasterSize; i++) {
218	0	Image->RasterBits[i] = Translation[Image->RasterBits[i]];
219	0	}
220	0	}
221
222		/******************************************************************************
223		Extension record functions
224		******************************************************************************/
225		int GifAddExtensionBlock(int *ExtensionBlockCount,
226		ExtensionBlock **ExtensionBlocks, int Function,
227	0	unsigned int Len, unsigned char ExtData[]) {
228	0	ExtensionBlock *ep;
229
230	0	if (*ExtensionBlocks == NULL) {
231	0	*ExtensionBlocks =
232	0	(ExtensionBlock *)malloc(sizeof(ExtensionBlock));
233	0	} else {
234	0	ExtensionBlock ep_new = (ExtensionBlock )reallocarray(
235	0	ExtensionBlocks, (ExtensionBlockCount + 1),
236	0	sizeof(ExtensionBlock));
237	0	if (ep_new == NULL) {
238	0	return (GIF_ERROR);
239	0	}
240	0	*ExtensionBlocks = ep_new;
241	0	}
242
243	0	if (*ExtensionBlocks == NULL) {
244	0	return (GIF_ERROR);
245	0	}
246
247	0	ep = &(ExtensionBlocks)[(ExtensionBlockCount)++];
248
249	0	ep->Function = Function;
250	0	ep->ByteCount = Len;
251	0	ep->Bytes = (GifByteType *)malloc(ep->ByteCount);
252	0	if (ep->Bytes == NULL) {
253	0	return (GIF_ERROR);
254	0	}
255
256	0	if (ExtData != NULL) {
257	0	memcpy(ep->Bytes, ExtData, Len);
258	0	}
259
260	0	return (GIF_OK);
261	0	}
262
263		void GifFreeExtensions(int *ExtensionBlockCount,
264	0	ExtensionBlock **ExtensionBlocks) {
265	0	ExtensionBlock *ep;
266
267	0	if (*ExtensionBlocks == NULL) {
268	0	return;
269	0	}
270
271	0	for (ep = *ExtensionBlocks;
272	0	ep < (ExtensionBlocks + ExtensionBlockCount); ep++) {
273	0	(void)free((char *)ep->Bytes);
274	0	}
275	0	(void)free((char )ExtensionBlocks);
276	0	*ExtensionBlocks = NULL;
277	0	*ExtensionBlockCount = 0;
278	0	}
279
280		/******************************************************************************
281		Image block allocation functions
282		******************************************************************************/
283
284		/* Private Function:
285		* Frees the last image in the GifFile->SavedImages array
286		*/
287	0	void FreeLastSavedImage(GifFileType *GifFile) {
288	0	SavedImage *sp;
289
290	0	if ((GifFile == NULL) \|\| (GifFile->SavedImages == NULL)) {
291	0	return;
292	0	}
293
294		/* Remove one SavedImage from the GifFile */
295	0	GifFile->ImageCount--;
296	0	sp = &GifFile->SavedImages[GifFile->ImageCount];
297
298		/* Deallocate its Colormap */
299	0	if (sp->ImageDesc.ColorMap != NULL) {
300	0	GifFreeMapObject(sp->ImageDesc.ColorMap);
301	0	sp->ImageDesc.ColorMap = NULL;
302	0	}
303
304		/* Deallocate the image data */
305	0	if (sp->RasterBits != NULL) {
306	0	free((char *)sp->RasterBits);
307	0	}
308
309		/* Deallocate any extensions */
310	0	GifFreeExtensions(&sp->ExtensionBlockCount, &sp->ExtensionBlocks);
311
312		/*** FIXME: We could realloc the GifFile->SavedImages structure but is
313		* there a point to it? Saves some memory but we'd have to do it every
314		* time. If this is used in GifFreeSavedImages then it would be
315		* inefficient (The whole array is going to be deallocated.) If we just
316		* use it when we want to free the last Image it's convenient to do it
317		* here.
318		*/
319	0	}
320
321		/*
322		* Append an image block to the SavedImages array
323		*/
324		SavedImage GifMakeSavedImage(GifFileType GifFile,
325	0	const SavedImage *CopyFrom) {
326		// cppcheck-suppress ctunullpointer
327	0	if (GifFile->SavedImages == NULL) {
328	0	GifFile->SavedImages = (SavedImage *)malloc(sizeof(SavedImage));
329	0	} else {
330	0	SavedImage newSavedImages = (SavedImage )reallocarray(
331	0	GifFile->SavedImages, (GifFile->ImageCount + 1),
332	0	sizeof(SavedImage));
333	0	if (newSavedImages == NULL) {
334	0	return ((SavedImage *)NULL);
335	0	}
336	0	GifFile->SavedImages = newSavedImages;
337	0	}
338	0	if (GifFile->SavedImages == NULL) {
339	0	return ((SavedImage *)NULL);
340	0	} else {
341	0	SavedImage *sp = &GifFile->SavedImages[GifFile->ImageCount++];
342
343	0	if (CopyFrom != NULL) {
344	0	memcpy((char *)sp, CopyFrom, sizeof(SavedImage));
345
346		/*
347		* Make our own allocated copies of the heap fields in
348		* the copied record. This guards against potential
349		* aliasing problems.
350		*/
351
352		/* first, the local color map */
353	0	if (CopyFrom->ImageDesc.ColorMap != NULL) {
354	0	sp->ImageDesc.ColorMap = GifMakeMapObject(
355	0	CopyFrom->ImageDesc.ColorMap->ColorCount,
356	0	CopyFrom->ImageDesc.ColorMap->Colors);
357	0	if (sp->ImageDesc.ColorMap == NULL) {
358	0	FreeLastSavedImage(GifFile);
359	0	return (SavedImage *)(NULL);
360	0	}
361	0	}
362
363		/* next, the raster */
364	0	sp->RasterBits = (unsigned char *)reallocarray(
365	0	NULL,
366	0	(CopyFrom->ImageDesc.Height *
367	0	CopyFrom->ImageDesc.Width),
368	0	sizeof(GifPixelType));
369	0	if (sp->RasterBits == NULL) {
370	0	FreeLastSavedImage(GifFile);
371	0	return (SavedImage *)(NULL);
372	0	}
373	0	memcpy(sp->RasterBits, CopyFrom->RasterBits,
374	0	sizeof(GifPixelType) *
375	0	CopyFrom->ImageDesc.Height *
376	0	CopyFrom->ImageDesc.Width);
377
378		/* finally, the extension blocks */
379	0	if (CopyFrom->ExtensionBlocks != NULL) {
380	0	sp->ExtensionBlocks =
381	0	(ExtensionBlock *)reallocarray(
382	0	NULL, CopyFrom->ExtensionBlockCount,
383	0	sizeof(ExtensionBlock));
384	0	if (sp->ExtensionBlocks == NULL) {
385	0	FreeLastSavedImage(GifFile);
386	0	return (SavedImage *)(NULL);
387	0	}
388	0	memcpy(sp->ExtensionBlocks,
389	0	CopyFrom->ExtensionBlocks,
390	0	sizeof(ExtensionBlock) *
391	0	CopyFrom->ExtensionBlockCount);
392	0	}
393	0	} else {
394	0	memset((char *)sp, '\0', sizeof(SavedImage));
395	0	}
396
397	0	return (sp);
398	0	}
399	0	}
400
401	0	void GifFreeSavedImages(GifFileType *GifFile) {
402	0	SavedImage *sp;
403
404	0	if ((GifFile == NULL) \|\| (GifFile->SavedImages == NULL)) {
405	0	return;
406	0	}
407	0	for (sp = GifFile->SavedImages;
408	0	sp < GifFile->SavedImages + GifFile->ImageCount; sp++) {
409	0	if (sp->ImageDesc.ColorMap != NULL) {
410	0	GifFreeMapObject(sp->ImageDesc.ColorMap);
411	0	sp->ImageDesc.ColorMap = NULL;
412	0	}
413
414	0	if (sp->RasterBits != NULL) {
415	0	free((char *)sp->RasterBits);
416	0	}
417
418	0	GifFreeExtensions(&sp->ExtensionBlockCount,
419	0	&sp->ExtensionBlocks);
420	0	}
421	0	free((char *)GifFile->SavedImages);
422	0	GifFile->SavedImages = NULL;
423	0	}
424
425		/* end */