ReactOS 0.4.15-dev-8235-gcd88a97
jmemmgr.c File Reference
#include "jinclude.h"
#include "jpeglib.h"
#include "jmemsys.h"
Include dependency graph for jmemmgr.c:

Go to the source code of this file.

Classes

union  small_pool_struct
 
union  large_pool_struct
 
struct  my_memory_mgr
 
struct  jvirt_sarray_control
 
struct  jvirt_barray_control
 

Macros

#define JPEG_INTERNALS
 
#define AM_MEMORY_MANAGER   /* we define jvirt_Xarray_control structs */
 
#define ALIGN_TYPE   double
 
#define MIN_SLOP   50 /* greater than 0 to avoid futile looping */
 

Typedefs

typedef union small_pool_structsmall_pool_ptr
 
typedef union small_pool_struct small_pool_hdr
 
typedef union large_pool_struct FARlarge_pool_ptr
 
typedef union large_pool_struct large_pool_hdr
 
typedef my_memory_mgrmy_mem_ptr
 

Functions

char *getenv JPP ((const char *name))
 
 out_of_memory (j_common_ptr cinfo, int which)
 
 alloc_small (j_common_ptr cinfo, int pool_id, size_t sizeofobject)
 
 alloc_large (j_common_ptr cinfo, int pool_id, size_t sizeofobject)
 
 alloc_sarray (j_common_ptr cinfo, int pool_id, JDIMENSION samplesperrow, JDIMENSION numrows)
 
 alloc_barray (j_common_ptr cinfo, int pool_id, JDIMENSION blocksperrow, JDIMENSION numrows)
 
 request_virt_sarray (j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION samplesperrow, JDIMENSION numrows, JDIMENSION maxaccess)
 
 request_virt_barray (j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION blocksperrow, JDIMENSION numrows, JDIMENSION maxaccess)
 
 realize_virt_arrays (j_common_ptr cinfo)
 
 do_sarray_io (j_common_ptr cinfo, jvirt_sarray_ptr ptr, boolean writing)
 
 do_barray_io (j_common_ptr cinfo, jvirt_barray_ptr ptr, boolean writing)
 
 access_virt_sarray (j_common_ptr cinfo, jvirt_sarray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows, boolean writable)
 
 access_virt_barray (j_common_ptr cinfo, jvirt_barray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows, boolean writable)
 
 free_pool (j_common_ptr cinfo, int pool_id)
 
 self_destruct (j_common_ptr cinfo)
 
 jinit_memory_mgr (j_common_ptr cinfo)
 

Variables

static const size_t first_pool_slop [JPOOL_NUMPOOLS]
 
static const size_t extra_pool_slop [JPOOL_NUMPOOLS]
 

Macro Definition Documentation

◆ ALIGN_TYPE

#define ALIGN_TYPE   double

Definition at line 74 of file jmemmgr.c.

◆ AM_MEMORY_MANAGER

#define AM_MEMORY_MANAGER   /* we define jvirt_Xarray_control structs */

Definition at line 29 of file jmemmgr.c.

◆ JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 28 of file jmemmgr.c.

◆ MIN_SLOP

#define MIN_SLOP   50 /* greater than 0 to avoid futile looping */

Definition at line 254 of file jmemmgr.c.

Typedef Documentation

◆ large_pool_hdr

◆ large_pool_ptr

Definition at line 101 of file jmemmgr.c.

◆ my_mem_ptr

Definition at line 141 of file jmemmgr.c.

◆ small_pool_hdr

◆ small_pool_ptr

Definition at line 90 of file jmemmgr.c.

Function Documentation

◆ access_virt_barray()

access_virt_barray ( j_common_ptr  cinfo,
jvirt_barray_ptr  ptr,
JDIMENSION  start_row,
JDIMENSION  num_rows,
boolean  writable 
)

Definition at line 838 of file jmemmgr.c.

844{
845 JDIMENSION end_row = start_row + num_rows;
846 JDIMENSION undef_row;
847
848 /* debugging check */
849 if (end_row > ptr->rows_in_array || num_rows > ptr->maxaccess ||
850 ptr->mem_buffer == NULL)
851 ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
852
853 /* Make the desired part of the virtual array accessible */
854 if (start_row < ptr->cur_start_row ||
855 end_row > ptr->cur_start_row + ptr->rows_in_mem) {
856 if (! ptr->b_s_open)
857 ERREXIT(cinfo, JERR_VIRTUAL_BUG);
858 /* Flush old buffer contents if necessary */
859 if (ptr->dirty) {
860 do_barray_io(cinfo, ptr, TRUE);
861 ptr->dirty = FALSE;
862 }
863 /* Decide what part of virtual array to access.
864 * Algorithm: if target address > current window, assume forward scan,
865 * load starting at target address. If target address < current window,
866 * assume backward scan, load so that target area is top of window.
867 * Note that when switching from forward write to forward read, will have
868 * start_row = 0, so the limiting case applies and we load from 0 anyway.
869 */
870 if (start_row > ptr->cur_start_row) {
871 ptr->cur_start_row = start_row;
872 } else {
873 /* use long arithmetic here to avoid overflow & unsigned problems */
874 long ltemp;
875
876 ltemp = (long) end_row - (long) ptr->rows_in_mem;
877 if (ltemp < 0)
878 ltemp = 0; /* don't fall off front end of file */
879 ptr->cur_start_row = (JDIMENSION) ltemp;
880 }
881 /* Read in the selected part of the array.
882 * During the initial write pass, we will do no actual read
883 * because the selected part is all undefined.
884 */
885 do_barray_io(cinfo, ptr, FALSE);
886 }
887 /* Ensure the accessed part of the array is defined; prezero if needed.
888 * To improve locality of access, we only prezero the part of the array
889 * that the caller is about to access, not the entire in-memory array.
890 */
891 if (ptr->first_undef_row < end_row) {
892 if (ptr->first_undef_row < start_row) {
893 if (writable) /* writer skipped over a section of array */
894 ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
895 undef_row = start_row; /* but reader is allowed to read ahead */
896 } else {
897 undef_row = ptr->first_undef_row;
898 }
899 if (writable)
900 ptr->first_undef_row = end_row;
901 if (ptr->pre_zero) {
902 size_t bytesperrow = (size_t) ptr->blocksperrow * SIZEOF(JBLOCK);
903 undef_row -= ptr->cur_start_row; /* make indexes relative to buffer */
904 end_row -= ptr->cur_start_row;
905 while (undef_row < end_row) {
906 FMEMZERO((void FAR *) ptr->mem_buffer[undef_row], bytesperrow);
907 undef_row++;
908 }
909 } else {
910 if (! writable) /* reader looking at undefined data */
911 ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
912 }
913 }
914 /* Flag the buffer dirty if caller will write in it */
915 if (writable)
916 ptr->dirty = TRUE;
917 /* Return address of proper part of the buffer */
918 return ptr->mem_buffer + (start_row - ptr->cur_start_row);
919}
#define SIZEOF(_ar)
Definition: calc.h:97
#define NULL
Definition: types.h:112
#define TRUE
Definition: types.h:120
#define FALSE
Definition: types.h:117
#define FAR
Definition: zlib.h:34
__kernel_size_t size_t
Definition: linux.h:237
do_barray_io(j_common_ptr cinfo, jvirt_barray_ptr ptr, boolean writing)
Definition: jmemmgr.c:720
unsigned int JDIMENSION
Definition: jmorecfg.h:229
#define FMEMZERO(target, size)
Definition: jpegint.h:368
int JSAMPARRAY int int num_rows
Definition: jpegint.h:421
JCOEF JBLOCK[DCTSIZE2]
Definition: jpeglib.h:79
static PVOID ptr
Definition: dispmode.c:27
#define long
Definition: qsort.c:33
#define ERREXIT(msg)
Definition: rdjpgcom.c:72

Referenced by jinit_memory_mgr().

◆ access_virt_sarray()

access_virt_sarray ( j_common_ptr  cinfo,
jvirt_sarray_ptr  ptr,
JDIMENSION  start_row,
JDIMENSION  num_rows,
boolean  writable 
)

Definition at line 753 of file jmemmgr.c.

759{
760 JDIMENSION end_row = start_row + num_rows;
761 JDIMENSION undef_row;
762
763 /* debugging check */
764 if (end_row > ptr->rows_in_array || num_rows > ptr->maxaccess ||
765 ptr->mem_buffer == NULL)
766 ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
767
768 /* Make the desired part of the virtual array accessible */
769 if (start_row < ptr->cur_start_row ||
770 end_row > ptr->cur_start_row + ptr->rows_in_mem) {
771 if (! ptr->b_s_open)
772 ERREXIT(cinfo, JERR_VIRTUAL_BUG);
773 /* Flush old buffer contents if necessary */
774 if (ptr->dirty) {
775 do_sarray_io(cinfo, ptr, TRUE);
776 ptr->dirty = FALSE;
777 }
778 /* Decide what part of virtual array to access.
779 * Algorithm: if target address > current window, assume forward scan,
780 * load starting at target address. If target address < current window,
781 * assume backward scan, load so that target area is top of window.
782 * Note that when switching from forward write to forward read, will have
783 * start_row = 0, so the limiting case applies and we load from 0 anyway.
784 */
785 if (start_row > ptr->cur_start_row) {
786 ptr->cur_start_row = start_row;
787 } else {
788 /* use long arithmetic here to avoid overflow & unsigned problems */
789 long ltemp;
790
791 ltemp = (long) end_row - (long) ptr->rows_in_mem;
792 if (ltemp < 0)
793 ltemp = 0; /* don't fall off front end of file */
794 ptr->cur_start_row = (JDIMENSION) ltemp;
795 }
796 /* Read in the selected part of the array.
797 * During the initial write pass, we will do no actual read
798 * because the selected part is all undefined.
799 */
800 do_sarray_io(cinfo, ptr, FALSE);
801 }
802 /* Ensure the accessed part of the array is defined; prezero if needed.
803 * To improve locality of access, we only prezero the part of the array
804 * that the caller is about to access, not the entire in-memory array.
805 */
806 if (ptr->first_undef_row < end_row) {
807 if (ptr->first_undef_row < start_row) {
808 if (writable) /* writer skipped over a section of array */
809 ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
810 undef_row = start_row; /* but reader is allowed to read ahead */
811 } else {
812 undef_row = ptr->first_undef_row;
813 }
814 if (writable)
815 ptr->first_undef_row = end_row;
816 if (ptr->pre_zero) {
817 size_t bytesperrow = (size_t) ptr->samplesperrow * SIZEOF(JSAMPLE);
818 undef_row -= ptr->cur_start_row; /* make indexes relative to buffer */
819 end_row -= ptr->cur_start_row;
820 while (undef_row < end_row) {
821 FMEMZERO((void FAR *) ptr->mem_buffer[undef_row], bytesperrow);
822 undef_row++;
823 }
824 } else {
825 if (! writable) /* reader looking at undefined data */
826 ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
827 }
828 }
829 /* Flag the buffer dirty if caller will write in it */
830 if (writable)
831 ptr->dirty = TRUE;
832 /* Return address of proper part of the buffer */
833 return ptr->mem_buffer + (start_row - ptr->cur_start_row);
834}
do_sarray_io(j_common_ptr cinfo, jvirt_sarray_ptr ptr, boolean writing)
Definition: jmemmgr.c:687
char JSAMPLE
Definition: jmorecfg.h:74

Referenced by jinit_memory_mgr().

◆ alloc_barray()

alloc_barray ( j_common_ptr  cinfo,
int  pool_id,
JDIMENSION  blocksperrow,
JDIMENSION  numrows 
)

Definition at line 443 of file jmemmgr.c.

446{
447 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
449 JBLOCKROW workspace;
450 JDIMENSION rowsperchunk, currow, i;
451 long ltemp;
452
453 /* Calculate max # of rows allowed in one allocation chunk */
455 ((long) blocksperrow * SIZEOF(JBLOCK));
456 if (ltemp <= 0)
457 ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
458 if (ltemp < (long) numrows)
459 rowsperchunk = (JDIMENSION) ltemp;
460 else
461 rowsperchunk = numrows;
462 mem->last_rowsperchunk = rowsperchunk;
463
464 /* Get space for row pointers (small object) */
465 result = (JBLOCKARRAY) alloc_small(cinfo, pool_id,
466 (size_t) numrows * SIZEOF(JBLOCKROW));
467
468 /* Get the rows themselves (large objects) */
469 currow = 0;
470 while (currow < numrows) {
471 rowsperchunk = MIN(rowsperchunk, numrows - currow);
472 workspace = (JBLOCKROW) alloc_large(cinfo, pool_id,
473 (size_t) rowsperchunk * (size_t) blocksperrow * SIZEOF(JBLOCK));
474 for (i = rowsperchunk; i > 0; i--) {
475 result[currow++] = workspace;
476 workspace += blocksperrow;
477 }
478 }
479
480 return result;
481}
#define MIN(x, y)
Definition: rdesktop.h:171
GLuint64EXT * result
Definition: glext.h:11304
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
alloc_small(j_common_ptr cinfo, int pool_id, size_t sizeofobject)
Definition: jmemmgr.c:258
my_memory_mgr * my_mem_ptr
Definition: jmemmgr.c:141
alloc_large(j_common_ptr cinfo, int pool_id, size_t sizeofobject)
Definition: jmemmgr.c:343
#define MAX_ALLOC_CHUNK
Definition: jmemsys.h:78
JBLOCK FAR * JBLOCKROW
Definition: jpeglib.h:80
JBLOCKROW * JBLOCKARRAY
Definition: jpeglib.h:81
Definition: mem.c:156

Referenced by jinit_memory_mgr(), and realize_virt_arrays().

◆ alloc_large()

alloc_large ( j_common_ptr  cinfo,
int  pool_id,
size_t  sizeofobject 
)

Definition at line 343 of file jmemmgr.c.

345{
346 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
347 large_pool_ptr hdr_ptr;
348 size_t odd_bytes;
349
350 /* Check for unsatisfiable request (do now to ensure no overflow below) */
352 out_of_memory(cinfo, 3); /* request exceeds malloc's ability */
353
354 /* Round up the requested size to a multiple of SIZEOF(ALIGN_TYPE) */
355 odd_bytes = sizeofobject % SIZEOF(ALIGN_TYPE);
356 if (odd_bytes > 0)
357 sizeofobject += SIZEOF(ALIGN_TYPE) - odd_bytes;
358
359 /* Always make a new pool */
360 if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
361 ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
362
363 hdr_ptr = (large_pool_ptr) jpeg_get_large(cinfo, sizeofobject +
365 if (hdr_ptr == NULL)
366 out_of_memory(cinfo, 4); /* jpeg_get_large failed */
367 mem->total_space_allocated += sizeofobject + SIZEOF(large_pool_hdr);
368
369 /* Success, initialize the new pool header and add to list */
370 hdr_ptr->hdr.next = mem->large_list[pool_id];
371 /* We maintain space counts in each pool header for statistical purposes,
372 * even though they are not needed for allocation.
373 */
374 hdr_ptr->hdr.bytes_used = sizeofobject;
375 hdr_ptr->hdr.bytes_left = 0;
376 mem->large_list[pool_id] = hdr_ptr;
377
378 return (void FAR *) (hdr_ptr + 1); /* point to first data byte in pool */
379}
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:212
jpeg_get_large(j_common_ptr cinfo, size_t sizeofobject)
Definition: jmemansi.c:56
union large_pool_struct FAR * large_pool_ptr
Definition: jmemmgr.c:101
#define ALIGN_TYPE
Definition: jmemmgr.c:74
out_of_memory(j_common_ptr cinfo, int which)
Definition: jmemmgr.c:218
size_t sizeofobject
Definition: jmemsys.h:47
#define JPOOL_NUMPOOLS
Definition: jpeglib.h:809
if(dx< 0)
Definition: linetemp.h:194

Referenced by alloc_barray(), alloc_sarray(), and jinit_memory_mgr().

◆ alloc_sarray()

alloc_sarray ( j_common_ptr  cinfo,
int  pool_id,
JDIMENSION  samplesperrow,
JDIMENSION  numrows 
)

Definition at line 396 of file jmemmgr.c.

399{
400 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
402 JSAMPROW workspace;
403 JDIMENSION rowsperchunk, currow, i;
404 long ltemp;
405
406 /* Calculate max # of rows allowed in one allocation chunk */
408 ((long) samplesperrow * SIZEOF(JSAMPLE));
409 if (ltemp <= 0)
410 ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
411 if (ltemp < (long) numrows)
412 rowsperchunk = (JDIMENSION) ltemp;
413 else
414 rowsperchunk = numrows;
415 mem->last_rowsperchunk = rowsperchunk;
416
417 /* Get space for row pointers (small object) */
418 result = (JSAMPARRAY) alloc_small(cinfo, pool_id,
419 (size_t) numrows * SIZEOF(JSAMPROW));
420
421 /* Get the rows themselves (large objects) */
422 currow = 0;
423 while (currow < numrows) {
424 rowsperchunk = MIN(rowsperchunk, numrows - currow);
425 workspace = (JSAMPROW) alloc_large(cinfo, pool_id,
426 (size_t) rowsperchunk * (size_t) samplesperrow * SIZEOF(JSAMPLE));
427 for (i = rowsperchunk; i > 0; i--) {
428 result[currow++] = workspace;
429 workspace += samplesperrow;
430 }
431 }
432
433 return result;
434}
JSAMPROW * JSAMPARRAY
Definition: jpeglib.h:76
JSAMPLE FAR * JSAMPROW
Definition: jpeglib.h:75

Referenced by jinit_memory_mgr(), and realize_virt_arrays().

◆ alloc_small()

alloc_small ( j_common_ptr  cinfo,
int  pool_id,
size_t  sizeofobject 
)

Definition at line 258 of file jmemmgr.c.

260{
261 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
262 small_pool_ptr hdr_ptr, prev_hdr_ptr;
263 size_t odd_bytes, min_request, slop;
264 char * data_ptr;
265
266 /* Check for unsatisfiable request (do now to ensure no overflow below) */
268 out_of_memory(cinfo, 1); /* request exceeds malloc's ability */
269
270 /* Round up the requested size to a multiple of SIZEOF(ALIGN_TYPE) */
271 odd_bytes = sizeofobject % SIZEOF(ALIGN_TYPE);
272 if (odd_bytes > 0)
273 sizeofobject += SIZEOF(ALIGN_TYPE) - odd_bytes;
274
275 /* See if space is available in any existing pool */
276 if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
277 ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
278 prev_hdr_ptr = NULL;
279 hdr_ptr = mem->small_list[pool_id];
280 while (hdr_ptr != NULL) {
281 if (hdr_ptr->hdr.bytes_left >= sizeofobject)
282 break; /* found pool with enough space */
283 prev_hdr_ptr = hdr_ptr;
284 hdr_ptr = hdr_ptr->hdr.next;
285 }
286
287 /* Time to make a new pool? */
288 if (hdr_ptr == NULL) {
289 /* min_request is what we need now, slop is what will be leftover */
290 min_request = sizeofobject + SIZEOF(small_pool_hdr);
291 if (prev_hdr_ptr == NULL) /* first pool in class? */
292 slop = first_pool_slop[pool_id];
293 else
294 slop = extra_pool_slop[pool_id];
295 /* Don't ask for more than MAX_ALLOC_CHUNK */
296 if (slop > (size_t) MAX_ALLOC_CHUNK - min_request)
297 slop = (size_t) MAX_ALLOC_CHUNK - min_request;
298 /* Try to get space, if fail reduce slop and try again */
299 for (;;) {
300 hdr_ptr = (small_pool_ptr) jpeg_get_small(cinfo, min_request + slop);
301 if (hdr_ptr != NULL)
302 break;
303 slop /= 2;
304 if (slop < MIN_SLOP) /* give up when it gets real small */
305 out_of_memory(cinfo, 2); /* jpeg_get_small failed */
306 }
307 mem->total_space_allocated += min_request + slop;
308 /* Success, initialize the new pool header and add to end of list */
309 hdr_ptr->hdr.next = NULL;
310 hdr_ptr->hdr.bytes_used = 0;
311 hdr_ptr->hdr.bytes_left = sizeofobject + slop;
312 if (prev_hdr_ptr == NULL) /* first pool in class? */
313 mem->small_list[pool_id] = hdr_ptr;
314 else
315 prev_hdr_ptr->hdr.next = hdr_ptr;
316 }
317
318 /* OK, allocate the object from the current pool */
319 data_ptr = (char *) (hdr_ptr + 1); /* point to first data byte in pool */
320 data_ptr += hdr_ptr->hdr.bytes_used; /* point to place for object */
321 hdr_ptr->hdr.bytes_used += sizeofobject;
322 hdr_ptr->hdr.bytes_left -= sizeofobject;
323
324 return (void *) data_ptr;
325}
jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject)
Definition: jmemansi.c:36
union small_pool_struct * small_pool_ptr
Definition: jmemmgr.c:90
static const size_t extra_pool_slop[JPOOL_NUMPOOLS]
Definition: jmemmgr.c:248
#define MIN_SLOP
Definition: jmemmgr.c:254
static const size_t first_pool_slop[JPOOL_NUMPOOLS]
Definition: jmemmgr.c:242
struct small_pool_struct::@190 hdr

Referenced by alloc_barray(), alloc_sarray(), jinit_memory_mgr(), request_virt_barray(), and request_virt_sarray().

◆ do_barray_io()

do_barray_io ( j_common_ptr  cinfo,
jvirt_barray_ptr  ptr,
boolean  writing 
)

Definition at line 720 of file jmemmgr.c.

722{
723 long bytesperrow, file_offset, byte_count, rows, thisrow, i;
724
725 bytesperrow = (long) ptr->blocksperrow * SIZEOF(JBLOCK);
726 file_offset = (long) ptr->cur_start_row * bytesperrow;
727 /* Loop to read or write each allocation chunk in mem_buffer */
728 for (i = 0; i < (long) ptr->rows_in_mem; i += ptr->rowsperchunk) {
729 /* One chunk, but check for short chunk at end of buffer */
730 rows = MIN((long) ptr->rowsperchunk, (long) ptr->rows_in_mem - i);
731 /* Transfer no more than is currently defined */
732 thisrow = (long) ptr->cur_start_row + i;
733 rows = MIN(rows, (long) ptr->first_undef_row - thisrow);
734 /* Transfer no more than fits in file */
735 rows = MIN(rows, (long) ptr->rows_in_array - thisrow);
736 if (rows <= 0) /* this chunk might be past end of file! */
737 break;
738 byte_count = rows * bytesperrow;
739 if (writing)
740 (*ptr->b_s_info.write_backing_store) (cinfo, & ptr->b_s_info,
741 (void FAR *) ptr->mem_buffer[i],
742 file_offset, byte_count);
743 else
744 (*ptr->b_s_info.read_backing_store) (cinfo, & ptr->b_s_info,
745 (void FAR *) ptr->mem_buffer[i],
746 file_offset, byte_count);
747 file_offset += byte_count;
748 }
749}
#define for
Definition: utility.h:88

Referenced by access_virt_barray().

◆ do_sarray_io()

do_sarray_io ( j_common_ptr  cinfo,
jvirt_sarray_ptr  ptr,
boolean  writing 
)

Definition at line 687 of file jmemmgr.c.

689{
690 long bytesperrow, file_offset, byte_count, rows, thisrow, i;
691
692 bytesperrow = (long) ptr->samplesperrow * SIZEOF(JSAMPLE);
693 file_offset = (long) ptr->cur_start_row * bytesperrow;
694 /* Loop to read or write each allocation chunk in mem_buffer */
695 for (i = 0; i < (long) ptr->rows_in_mem; i += ptr->rowsperchunk) {
696 /* One chunk, but check for short chunk at end of buffer */
697 rows = MIN((long) ptr->rowsperchunk, (long) ptr->rows_in_mem - i);
698 /* Transfer no more than is currently defined */
699 thisrow = (long) ptr->cur_start_row + i;
700 rows = MIN(rows, (long) ptr->first_undef_row - thisrow);
701 /* Transfer no more than fits in file */
702 rows = MIN(rows, (long) ptr->rows_in_array - thisrow);
703 if (rows <= 0) /* this chunk might be past end of file! */
704 break;
705 byte_count = rows * bytesperrow;
706 if (writing)
707 (*ptr->b_s_info.write_backing_store) (cinfo, & ptr->b_s_info,
708 (void FAR *) ptr->mem_buffer[i],
709 file_offset, byte_count);
710 else
711 (*ptr->b_s_info.read_backing_store) (cinfo, & ptr->b_s_info,
712 (void FAR *) ptr->mem_buffer[i],
713 file_offset, byte_count);
714 file_offset += byte_count;
715 }
716}

Referenced by access_virt_sarray().

◆ free_pool()

free_pool ( j_common_ptr  cinfo,
int  pool_id 
)

Definition at line 927 of file jmemmgr.c.

928{
929 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
930 small_pool_ptr shdr_ptr;
931 large_pool_ptr lhdr_ptr;
932 size_t space_freed;
933
934 if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
935 ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
936
937#ifdef MEM_STATS
938 if (cinfo->err->trace_level > 1)
939 print_mem_stats(cinfo, pool_id); /* print pool's memory usage statistics */
940#endif
941
942 /* If freeing IMAGE pool, close any virtual arrays first */
943 if (pool_id == JPOOL_IMAGE) {
944 jvirt_sarray_ptr sptr;
945 jvirt_barray_ptr bptr;
946
947 for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
948 if (sptr->b_s_open) { /* there may be no backing store */
949 sptr->b_s_open = FALSE; /* prevent recursive close if error */
950 (*sptr->b_s_info.close_backing_store) (cinfo, & sptr->b_s_info);
951 }
952 }
953 mem->virt_sarray_list = NULL;
954 for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
955 if (bptr->b_s_open) { /* there may be no backing store */
956 bptr->b_s_open = FALSE; /* prevent recursive close if error */
957 (*bptr->b_s_info.close_backing_store) (cinfo, & bptr->b_s_info);
958 }
959 }
960 mem->virt_barray_list = NULL;
961 }
962
963 /* Release large objects */
964 lhdr_ptr = mem->large_list[pool_id];
965 mem->large_list[pool_id] = NULL;
966
967 while (lhdr_ptr != NULL) {
968 large_pool_ptr next_lhdr_ptr = lhdr_ptr->hdr.next;
969 space_freed = lhdr_ptr->hdr.bytes_used +
970 lhdr_ptr->hdr.bytes_left +
972 jpeg_free_large(cinfo, (void FAR *) lhdr_ptr, space_freed);
973 mem->total_space_allocated -= space_freed;
974 lhdr_ptr = next_lhdr_ptr;
975 }
976
977 /* Release small objects */
978 shdr_ptr = mem->small_list[pool_id];
979 mem->small_list[pool_id] = NULL;
980
981 while (shdr_ptr != NULL) {
982 small_pool_ptr next_shdr_ptr = shdr_ptr->hdr.next;
983 space_freed = shdr_ptr->hdr.bytes_used +
984 shdr_ptr->hdr.bytes_left +
986 jpeg_free_small(cinfo, (void *) shdr_ptr, space_freed);
987 mem->total_space_allocated -= space_freed;
988 shdr_ptr = next_shdr_ptr;
989 }
990}
jpeg_free_large(j_common_ptr cinfo, void FAR *object, size_t sizeofobject)
Definition: jmemansi.c:62
jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject)
Definition: jmemansi.c:42
#define JPOOL_IMAGE
Definition: jpeglib.h:808
struct define * next
Definition: compiler.c:65
backing_store_info b_s_info
Definition: jmemmgr.c:180
jvirt_barray_ptr next
Definition: jmemmgr.c:179
backing_store_info b_s_info
Definition: jmemmgr.c:164
jvirt_sarray_ptr next
Definition: jmemmgr.c:163

Referenced by jinit_memory_mgr(), and self_destruct().

◆ jinit_memory_mgr()

jinit_memory_mgr ( j_common_ptr  cinfo)

Definition at line 1025 of file jmemmgr.c.

1026{
1028 long max_to_use;
1029 int pool;
1030 size_t test_mac;
1031
1032 cinfo->mem = NULL; /* for safety if init fails */
1033
1034 /* Check for configuration errors.
1035 * SIZEOF(ALIGN_TYPE) should be a power of 2; otherwise, it probably
1036 * doesn't reflect any real hardware alignment requirement.
1037 * The test is a little tricky: for X>0, X and X-1 have no one-bits
1038 * in common if and only if X is a power of 2, ie has only one one-bit.
1039 * Some compilers may give an "unreachable code" warning here; ignore it.
1040 */
1041 if ((SIZEOF(ALIGN_TYPE) & (SIZEOF(ALIGN_TYPE)-1)) != 0)
1042 ERREXIT(cinfo, JERR_BAD_ALIGN_TYPE);
1043 /* MAX_ALLOC_CHUNK must be representable as type size_t, and must be
1044 * a multiple of SIZEOF(ALIGN_TYPE).
1045 * Again, an "unreachable code" warning may be ignored here.
1046 * But a "constant too large" warning means you need to fix MAX_ALLOC_CHUNK.
1047 */
1049 if ((long) test_mac != MAX_ALLOC_CHUNK ||
1051 ERREXIT(cinfo, JERR_BAD_ALLOC_CHUNK);
1052
1053 max_to_use = jpeg_mem_init(cinfo); /* system-dependent initialization */
1054
1055 /* Attempt to allocate memory manager's control block */
1057
1058 if (mem == NULL) {
1059 jpeg_mem_term(cinfo); /* system-dependent cleanup */
1060 ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 0);
1061 }
1062
1063 /* OK, fill in the method pointers */
1064 mem->pub.alloc_small = alloc_small;
1065 mem->pub.alloc_large = alloc_large;
1066 mem->pub.alloc_sarray = alloc_sarray;
1067 mem->pub.alloc_barray = alloc_barray;
1068 mem->pub.request_virt_sarray = request_virt_sarray;
1069 mem->pub.request_virt_barray = request_virt_barray;
1070 mem->pub.realize_virt_arrays = realize_virt_arrays;
1071 mem->pub.access_virt_sarray = access_virt_sarray;
1072 mem->pub.access_virt_barray = access_virt_barray;
1073 mem->pub.free_pool = free_pool;
1074 mem->pub.self_destruct = self_destruct;
1075
1076 /* Make MAX_ALLOC_CHUNK accessible to other modules */
1077 mem->pub.max_alloc_chunk = MAX_ALLOC_CHUNK;
1078
1079 /* Initialize working state */
1080 mem->pub.max_memory_to_use = max_to_use;
1081
1082 for (pool = JPOOL_NUMPOOLS-1; pool >= JPOOL_PERMANENT; pool--) {
1083 mem->small_list[pool] = NULL;
1084 mem->large_list[pool] = NULL;
1085 }
1086 mem->virt_sarray_list = NULL;
1087 mem->virt_barray_list = NULL;
1088
1089 mem->total_space_allocated = SIZEOF(my_memory_mgr);
1090
1091 /* Declare ourselves open for business */
1092 cinfo->mem = &mem->pub;
1093
1094 /* Check for an environment variable JPEGMEM; if found, override the
1095 * default max_memory setting from jpeg_mem_init. Note that the
1096 * surrounding application may again override this value.
1097 * If your system doesn't support getenv(), define NO_GETENV to disable
1098 * this feature.
1099 */
1100#ifndef NO_GETENV
1101 { char * memenv;
1102
1103 if ((memenv = getenv("JPEGMEM")) != NULL) {
1104 char ch = 'x';
1105
1106 if (sscanf(memenv, "%ld%c", &max_to_use, &ch) > 0) {
1107 if (ch == 'm' || ch == 'M')
1108 max_to_use *= 1000L;
1109 mem->pub.max_memory_to_use = max_to_use * 1000L;
1110 }
1111 }
1112 }
1113#endif
1114
1115}
_Check_return_ _CRTIMP int __cdecl sscanf(_In_z_ const char *_Src, _In_z_ _Scanf_format_string_ const char *_Format,...)
_Check_return_ char *__cdecl getenv(_In_z_ const char *_VarName)
jpeg_mem_term(j_common_ptr cinfo)
Definition: jmemansi.c:164
jpeg_mem_init(j_common_ptr cinfo)
Definition: jmemansi.c:158
self_destruct(j_common_ptr cinfo)
Definition: jmemmgr.c:999
alloc_sarray(j_common_ptr cinfo, int pool_id, JDIMENSION samplesperrow, JDIMENSION numrows)
Definition: jmemmgr.c:396
request_virt_sarray(j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION samplesperrow, JDIMENSION numrows, JDIMENSION maxaccess)
Definition: jmemmgr.c:522
access_virt_barray(j_common_ptr cinfo, jvirt_barray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows, boolean writable)
Definition: jmemmgr.c:838
request_virt_barray(j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION blocksperrow, JDIMENSION numrows, JDIMENSION maxaccess)
Definition: jmemmgr.c:552
access_virt_sarray(j_common_ptr cinfo, jvirt_sarray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows, boolean writable)
Definition: jmemmgr.c:753
free_pool(j_common_ptr cinfo, int pool_id)
Definition: jmemmgr.c:927
realize_virt_arrays(j_common_ptr cinfo)
Definition: jmemmgr.c:582
alloc_barray(j_common_ptr cinfo, int pool_id, JDIMENSION blocksperrow, JDIMENSION numrows)
Definition: jmemmgr.c:443
#define JPOOL_PERMANENT
Definition: jpeglib.h:807
static void test_mac(void)
Definition: rsaenh.c:1849

Referenced by jpeg_CreateCompress(), and jpeg_CreateDecompress().

◆ JPP()

char *getenv JPP ( (const char *name )

◆ out_of_memory()

out_of_memory ( j_common_ptr  cinfo,
int  which 
)

Definition at line 218 of file jmemmgr.c.

221{
222#ifdef MEM_STATS
223 cinfo->err->trace_level = 2; /* force self_destruct to report stats */
224#endif
225 ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, which);
226}
static GLenum which
Definition: wgl_font.c:159

Referenced by alloc_large(), alloc_proxy_textures(), and alloc_small().

◆ realize_virt_arrays()

realize_virt_arrays ( j_common_ptr  cinfo)

Definition at line 582 of file jmemmgr.c.

584{
585 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
586 long bytesperrow, space_per_minheight, maximum_space;
587 long avail_mem, minheights, max_minheights;
588 jvirt_sarray_ptr sptr;
589 jvirt_barray_ptr bptr;
590
591 /* Compute the minimum space needed (maxaccess rows in each buffer)
592 * and the maximum space needed (full image height in each buffer).
593 * These may be of use to the system-dependent jpeg_mem_available routine.
594 */
595 space_per_minheight = 0;
596 maximum_space = 0;
597 for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
598 if (sptr->mem_buffer == NULL) { /* if not realized yet */
599 bytesperrow = (long) sptr->samplesperrow * SIZEOF(JSAMPLE);
600 space_per_minheight += (long) sptr->maxaccess * bytesperrow;
601 maximum_space += (long) sptr->rows_in_array * bytesperrow;
602 }
603 }
604 for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
605 if (bptr->mem_buffer == NULL) { /* if not realized yet */
606 bytesperrow = (long) bptr->blocksperrow * SIZEOF(JBLOCK);
607 space_per_minheight += (long) bptr->maxaccess * bytesperrow;
608 maximum_space += (long) bptr->rows_in_array * bytesperrow;
609 }
610 }
611
612 if (space_per_minheight <= 0)
613 return; /* no unrealized arrays, no work */
614
615 /* Determine amount of memory to actually use; this is system-dependent. */
616 avail_mem = jpeg_mem_available(cinfo, space_per_minheight, maximum_space,
617 (long) mem->total_space_allocated);
618
619 /* If the maximum space needed is available, make all the buffers full
620 * height; otherwise parcel it out with the same number of minheights
621 * in each buffer.
622 */
623 if (avail_mem >= maximum_space)
624 max_minheights = 1000000000L;
625 else {
626 max_minheights = avail_mem / space_per_minheight;
627 /* If there doesn't seem to be enough space, try to get the minimum
628 * anyway. This allows a "stub" implementation of jpeg_mem_available().
629 */
630 if (max_minheights <= 0)
631 max_minheights = 1;
632 }
633
634 /* Allocate the in-memory buffers and initialize backing store as needed. */
635
636 for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
637 if (sptr->mem_buffer == NULL) { /* if not realized yet */
638 minheights = ((long) sptr->rows_in_array - 1L) / sptr->maxaccess + 1L;
639 if (minheights <= max_minheights) {
640 /* This buffer fits in memory */
641 sptr->rows_in_mem = sptr->rows_in_array;
642 } else {
643 /* It doesn't fit in memory, create backing store. */
644 sptr->rows_in_mem = (JDIMENSION) (max_minheights * sptr->maxaccess);
645 jpeg_open_backing_store(cinfo, & sptr->b_s_info,
646 (long) sptr->rows_in_array *
647 (long) sptr->samplesperrow *
648 (long) SIZEOF(JSAMPLE));
649 sptr->b_s_open = TRUE;
650 }
651 sptr->mem_buffer = alloc_sarray(cinfo, JPOOL_IMAGE,
652 sptr->samplesperrow, sptr->rows_in_mem);
653 sptr->rowsperchunk = mem->last_rowsperchunk;
654 sptr->cur_start_row = 0;
655 sptr->first_undef_row = 0;
656 sptr->dirty = FALSE;
657 }
658 }
659
660 for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
661 if (bptr->mem_buffer == NULL) { /* if not realized yet */
662 minheights = ((long) bptr->rows_in_array - 1L) / bptr->maxaccess + 1L;
663 if (minheights <= max_minheights) {
664 /* This buffer fits in memory */
665 bptr->rows_in_mem = bptr->rows_in_array;
666 } else {
667 /* It doesn't fit in memory, create backing store. */
668 bptr->rows_in_mem = (JDIMENSION) (max_minheights * bptr->maxaccess);
669 jpeg_open_backing_store(cinfo, & bptr->b_s_info,
670 (long) bptr->rows_in_array *
671 (long) bptr->blocksperrow *
672 (long) SIZEOF(JBLOCK));
673 bptr->b_s_open = TRUE;
674 }
675 bptr->mem_buffer = alloc_barray(cinfo, JPOOL_IMAGE,
676 bptr->blocksperrow, bptr->rows_in_mem);
677 bptr->rowsperchunk = mem->last_rowsperchunk;
678 bptr->cur_start_row = 0;
679 bptr->first_undef_row = 0;
680 bptr->dirty = FALSE;
681 }
682 }
683}
jpeg_open_backing_store(j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
Definition: jmemansi.c:141
jpeg_mem_available(j_common_ptr cinfo, long min_bytes_needed, long max_bytes_needed, long already_allocated)
Definition: jmemansi.c:81

Referenced by jinit_memory_mgr().

◆ request_virt_barray()

request_virt_barray ( j_common_ptr  cinfo,
int  pool_id,
boolean  pre_zero,
JDIMENSION  blocksperrow,
JDIMENSION  numrows,
JDIMENSION  maxaccess 
)

Definition at line 552 of file jmemmgr.c.

556{
557 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
559
560 /* Only IMAGE-lifetime virtual arrays are currently supported */
561 if (pool_id != JPOOL_IMAGE)
562 ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
563
564 /* get control block */
565 result = (jvirt_barray_ptr) alloc_small(cinfo, pool_id,
567
568 result->mem_buffer = NULL; /* marks array not yet realized */
569 result->rows_in_array = numrows;
570 result->blocksperrow = blocksperrow;
571 result->maxaccess = maxaccess;
572 result->pre_zero = pre_zero;
573 result->b_s_open = FALSE; /* no associated backing-store object */
574 result->next = mem->virt_barray_list; /* add to list of virtual arrays */
575 mem->virt_barray_list = result;
576
577 return result;
578}
struct jvirt_barray_control * jvirt_barray_ptr
Definition: jpeglib.h:812

Referenced by jinit_memory_mgr().

◆ request_virt_sarray()

request_virt_sarray ( j_common_ptr  cinfo,
int  pool_id,
boolean  pre_zero,
JDIMENSION  samplesperrow,
JDIMENSION  numrows,
JDIMENSION  maxaccess 
)

Definition at line 522 of file jmemmgr.c.

526{
527 my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
529
530 /* Only IMAGE-lifetime virtual arrays are currently supported */
531 if (pool_id != JPOOL_IMAGE)
532 ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
533
534 /* get control block */
535 result = (jvirt_sarray_ptr) alloc_small(cinfo, pool_id,
537
538 result->mem_buffer = NULL; /* marks array not yet realized */
539 result->rows_in_array = numrows;
540 result->samplesperrow = samplesperrow;
541 result->maxaccess = maxaccess;
542 result->pre_zero = pre_zero;
543 result->b_s_open = FALSE; /* no associated backing-store object */
544 result->next = mem->virt_sarray_list; /* add to list of virtual arrays */
545 mem->virt_sarray_list = result;
546
547 return result;
548}
struct jvirt_sarray_control * jvirt_sarray_ptr
Definition: jpeglib.h:811

Referenced by jinit_memory_mgr().

◆ self_destruct()

self_destruct ( j_common_ptr  cinfo)

Definition at line 999 of file jmemmgr.c.

1000{
1001 int pool;
1002
1003 /* Close all backing store, release all memory.
1004 * Releasing pools in reverse order might help avoid fragmentation
1005 * with some (brain-damaged) malloc libraries.
1006 */
1007 for (pool = JPOOL_NUMPOOLS-1; pool >= JPOOL_PERMANENT; pool--) {
1008 free_pool(cinfo, pool);
1009 }
1010
1011 /* Release the memory manager control block too. */
1012 jpeg_free_small(cinfo, (void *) cinfo->mem, SIZEOF(my_memory_mgr));
1013 cinfo->mem = NULL; /* ensures I will be called only once */
1014
1015 jpeg_mem_term(cinfo); /* system-dependent cleanup */
1016}

Referenced by jinit_memory_mgr().

Variable Documentation

◆ extra_pool_slop

const size_t extra_pool_slop[JPOOL_NUMPOOLS]
static
Initial value:
=
{
0,
5000
}

Definition at line 248 of file jmemmgr.c.

Referenced by alloc_small().

◆ first_pool_slop

const size_t first_pool_slop[JPOOL_NUMPOOLS]
static
Initial value:
=
{
1600,
16000
}

Definition at line 242 of file jmemmgr.c.

Referenced by alloc_small().