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_struct *	small_pool_ptr
typedef union small_pool_struct	small_pool_hdr
typedef union large_pool_struct FAR *	large_pool_ptr
typedef union large_pool_struct	large_pool_hdr
typedef my_memory_mgr *	my_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

typedef union large_pool_struct large_pool_hdr

large_pool_ptr

typedef union large_pool_struct FAR* large_pool_ptr

Definition at line 101 of file jmemmgr.c.

my_mem_ptr

typedef my_memory_mgr* my_mem_ptr

Definition at line 141 of file jmemmgr.c.

small_pool_hdr

typedef union small_pool_struct small_pool_hdr

small_pool_ptr

typedef union small_pool_struct* 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.

{
  JDIMENSION end_row = start_row + num_rows;
  JDIMENSION undef_row;
 
  /* debugging check */
  if (end_row > ptr->rows_in_array || num_rows > ptr->maxaccess ||
      ptr->mem_buffer == NULL)
    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
 
  /* Make the desired part of the virtual array accessible */
  if (start_row < ptr->cur_start_row ||
      end_row > ptr->cur_start_row + ptr->rows_in_mem) {
    if (! ptr->b_s_open)
      ERREXIT(cinfo, JERR_VIRTUAL_BUG);
    /* Flush old buffer contents if necessary */
    if (ptr->dirty) {
      do_barray_io(cinfo, ptr, TRUE);
      ptr->dirty = FALSE;
    }
    /* Decide what part of virtual array to access.
     * Algorithm: if target address > current window, assume forward scan,
     * load starting at target address.  If target address < current window,
     * assume backward scan, load so that target area is top of window.
     * Note that when switching from forward write to forward read, will have
     * start_row = 0, so the limiting case applies and we load from 0 anyway.
     */
    if (start_row > ptr->cur_start_row) {
      ptr->cur_start_row = start_row;
    } else {
      /* use long arithmetic here to avoid overflow & unsigned problems */
      long ltemp;
 
      ltemp = (long) end_row - (long) ptr->rows_in_mem;
      if (ltemp < 0)
    ltemp = 0;      /* don't fall off front end of file */
      ptr->cur_start_row = (JDIMENSION) ltemp;
    }
    /* Read in the selected part of the array.
     * During the initial write pass, we will do no actual read
     * because the selected part is all undefined.
     */
    do_barray_io(cinfo, ptr, FALSE);
  }
  /* Ensure the accessed part of the array is defined; prezero if needed.
   * To improve locality of access, we only prezero the part of the array
   * that the caller is about to access, not the entire in-memory array.
   */
  if (ptr->first_undef_row < end_row) {
    if (ptr->first_undef_row < start_row) {
      if (writable)     /* writer skipped over a section of array */
    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
      undef_row = start_row;    /* but reader is allowed to read ahead */
    } else {
      undef_row = ptr->first_undef_row;
    }
    if (writable)
      ptr->first_undef_row = end_row;
    if (ptr->pre_zero) {
      size_t bytesperrow = (size_t) ptr->blocksperrow * SIZEOF(JBLOCK);
      undef_row -= ptr->cur_start_row; /* make indexes relative to buffer */
      end_row -= ptr->cur_start_row;
      while (undef_row < end_row) {
    FMEMZERO((void FAR *) ptr->mem_buffer[undef_row], bytesperrow);
    undef_row++;
      }
    } else {
      if (! writable)       /* reader looking at undefined data */
    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
    }
  }
  /* Flag the buffer dirty if caller will write in it */
  if (writable)
    ptr->dirty = TRUE;
  /* Return address of proper part of the buffer */
  return ptr->mem_buffer + (start_row - ptr->cur_start_row);
}

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.

{
  JDIMENSION end_row = start_row + num_rows;
  JDIMENSION undef_row;
 
  /* debugging check */
  if (end_row > ptr->rows_in_array || num_rows > ptr->maxaccess ||
      ptr->mem_buffer == NULL)
    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
 
  /* Make the desired part of the virtual array accessible */
  if (start_row < ptr->cur_start_row ||
      end_row > ptr->cur_start_row + ptr->rows_in_mem) {
    if (! ptr->b_s_open)
      ERREXIT(cinfo, JERR_VIRTUAL_BUG);
    /* Flush old buffer contents if necessary */
    if (ptr->dirty) {
      do_sarray_io(cinfo, ptr, TRUE);
      ptr->dirty = FALSE;
    }
    /* Decide what part of virtual array to access.
     * Algorithm: if target address > current window, assume forward scan,
     * load starting at target address.  If target address < current window,
     * assume backward scan, load so that target area is top of window.
     * Note that when switching from forward write to forward read, will have
     * start_row = 0, so the limiting case applies and we load from 0 anyway.
     */
    if (start_row > ptr->cur_start_row) {
      ptr->cur_start_row = start_row;
    } else {
      /* use long arithmetic here to avoid overflow & unsigned problems */
      long ltemp;
 
      ltemp = (long) end_row - (long) ptr->rows_in_mem;
      if (ltemp < 0)
    ltemp = 0;      /* don't fall off front end of file */
      ptr->cur_start_row = (JDIMENSION) ltemp;
    }
    /* Read in the selected part of the array.
     * During the initial write pass, we will do no actual read
     * because the selected part is all undefined.
     */
    do_sarray_io(cinfo, ptr, FALSE);
  }
  /* Ensure the accessed part of the array is defined; prezero if needed.
   * To improve locality of access, we only prezero the part of the array
   * that the caller is about to access, not the entire in-memory array.
   */
  if (ptr->first_undef_row < end_row) {
    if (ptr->first_undef_row < start_row) {
      if (writable)     /* writer skipped over a section of array */
    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
      undef_row = start_row;    /* but reader is allowed to read ahead */
    } else {
      undef_row = ptr->first_undef_row;
    }
    if (writable)
      ptr->first_undef_row = end_row;
    if (ptr->pre_zero) {
      size_t bytesperrow = (size_t) ptr->samplesperrow * SIZEOF(JSAMPLE);
      undef_row -= ptr->cur_start_row; /* make indexes relative to buffer */
      end_row -= ptr->cur_start_row;
      while (undef_row < end_row) {
    FMEMZERO((void FAR *) ptr->mem_buffer[undef_row], bytesperrow);
    undef_row++;
      }
    } else {
      if (! writable)       /* reader looking at undefined data */
    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
    }
  }
  /* Flag the buffer dirty if caller will write in it */
  if (writable)
    ptr->dirty = TRUE;
  /* Return address of proper part of the buffer */
  return ptr->mem_buffer + (start_row - ptr->cur_start_row);
}

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.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  JBLOCKARRAY result;
  JBLOCKROW workspace;
  JDIMENSION rowsperchunk, currow, i;
  long ltemp;
 
  /* Calculate max # of rows allowed in one allocation chunk */
  ltemp = (MAX_ALLOC_CHUNK - SIZEOF(large_pool_hdr)) /
      ((long) blocksperrow * SIZEOF(JBLOCK));
  if (ltemp <= 0)
    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
  if (ltemp < (long) numrows)
    rowsperchunk = (JDIMENSION) ltemp;
  else
    rowsperchunk = numrows;
  mem->last_rowsperchunk = rowsperchunk;
 
  /* Get space for row pointers (small object) */
  result = (JBLOCKARRAY) alloc_small(cinfo, pool_id,
                     (size_t) numrows * SIZEOF(JBLOCKROW));
 
  /* Get the rows themselves (large objects) */
  currow = 0;
  while (currow < numrows) {
    rowsperchunk = MIN(rowsperchunk, numrows - currow);
    workspace = (JBLOCKROW) alloc_large(cinfo, pool_id,
      (size_t) rowsperchunk * (size_t) blocksperrow * SIZEOF(JBLOCK));
    for (i = rowsperchunk; i > 0; i--) {
      result[currow++] = workspace;
      workspace += blocksperrow;
    }
  }
 
  return result;
}

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.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  large_pool_ptr hdr_ptr;
  size_t odd_bytes;
 
  /* Check for unsatisfiable request (do now to ensure no overflow below) */
  if (sizeofobject > (size_t) MAX_ALLOC_CHUNK - SIZEOF(large_pool_hdr))
    out_of_memory(cinfo, 3);    /* request exceeds malloc's ability */
 
  /* Round up the requested size to a multiple of SIZEOF(ALIGN_TYPE) */
  odd_bytes = sizeofobject % SIZEOF(ALIGN_TYPE);
  if (odd_bytes > 0)
    sizeofobject += SIZEOF(ALIGN_TYPE) - odd_bytes;
 
  /* Always make a new pool */
  if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
 
  hdr_ptr = (large_pool_ptr) jpeg_get_large(cinfo, sizeofobject +
                        SIZEOF(large_pool_hdr));
  if (hdr_ptr == NULL)
    out_of_memory(cinfo, 4);    /* jpeg_get_large failed */
  mem->total_space_allocated += sizeofobject + SIZEOF(large_pool_hdr);
 
  /* Success, initialize the new pool header and add to list */
  hdr_ptr->hdr.next = mem->large_list[pool_id];
  /* We maintain space counts in each pool header for statistical purposes,
   * even though they are not needed for allocation.
   */
  hdr_ptr->hdr.bytes_used = sizeofobject;
  hdr_ptr->hdr.bytes_left = 0;
  mem->large_list[pool_id] = hdr_ptr;
 
  return (void FAR *) (hdr_ptr + 1); /* point to first data byte in pool */
}

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.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  JSAMPARRAY result;
  JSAMPROW workspace;
  JDIMENSION rowsperchunk, currow, i;
  long ltemp;
 
  /* Calculate max # of rows allowed in one allocation chunk */
  ltemp = (MAX_ALLOC_CHUNK - SIZEOF(large_pool_hdr)) /
      ((long) samplesperrow * SIZEOF(JSAMPLE));
  if (ltemp <= 0)
    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
  if (ltemp < (long) numrows)
    rowsperchunk = (JDIMENSION) ltemp;
  else
    rowsperchunk = numrows;
  mem->last_rowsperchunk = rowsperchunk;
 
  /* Get space for row pointers (small object) */
  result = (JSAMPARRAY) alloc_small(cinfo, pool_id,
                    (size_t) numrows * SIZEOF(JSAMPROW));
 
  /* Get the rows themselves (large objects) */
  currow = 0;
  while (currow < numrows) {
    rowsperchunk = MIN(rowsperchunk, numrows - currow);
    workspace = (JSAMPROW) alloc_large(cinfo, pool_id,
      (size_t) rowsperchunk * (size_t) samplesperrow * SIZEOF(JSAMPLE));
    for (i = rowsperchunk; i > 0; i--) {
      result[currow++] = workspace;
      workspace += samplesperrow;
    }
  }
 
  return result;
}

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.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  small_pool_ptr hdr_ptr, prev_hdr_ptr;
  size_t odd_bytes, min_request, slop;
  char * data_ptr;
 
  /* Check for unsatisfiable request (do now to ensure no overflow below) */
  if (sizeofobject > (size_t) MAX_ALLOC_CHUNK - SIZEOF(small_pool_hdr))
    out_of_memory(cinfo, 1);    /* request exceeds malloc's ability */
 
  /* Round up the requested size to a multiple of SIZEOF(ALIGN_TYPE) */
  odd_bytes = sizeofobject % SIZEOF(ALIGN_TYPE);
  if (odd_bytes > 0)
    sizeofobject += SIZEOF(ALIGN_TYPE) - odd_bytes;
 
  /* See if space is available in any existing pool */
  if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
  prev_hdr_ptr = NULL;
  hdr_ptr = mem->small_list[pool_id];
  while (hdr_ptr != NULL) {
    if (hdr_ptr->hdr.bytes_left >= sizeofobject)
      break;            /* found pool with enough space */
    prev_hdr_ptr = hdr_ptr;
    hdr_ptr = hdr_ptr->hdr.next;
  }
 
  /* Time to make a new pool? */
  if (hdr_ptr == NULL) {
    /* min_request is what we need now, slop is what will be leftover */
    min_request = sizeofobject + SIZEOF(small_pool_hdr);
    if (prev_hdr_ptr == NULL)   /* first pool in class? */
      slop = first_pool_slop[pool_id];
    else
      slop = extra_pool_slop[pool_id];
    /* Don't ask for more than MAX_ALLOC_CHUNK */
    if (slop > (size_t) MAX_ALLOC_CHUNK - min_request)
      slop = (size_t) MAX_ALLOC_CHUNK - min_request;
    /* Try to get space, if fail reduce slop and try again */
    for (;;) {
      hdr_ptr = (small_pool_ptr) jpeg_get_small(cinfo, min_request + slop);
      if (hdr_ptr != NULL)
    break;
      slop /= 2;
      if (slop < MIN_SLOP)  /* give up when it gets real small */
    out_of_memory(cinfo, 2); /* jpeg_get_small failed */
    }
    mem->total_space_allocated += min_request + slop;
    /* Success, initialize the new pool header and add to end of list */
    hdr_ptr->hdr.next = NULL;
    hdr_ptr->hdr.bytes_used = 0;
    hdr_ptr->hdr.bytes_left = sizeofobject + slop;
    if (prev_hdr_ptr == NULL)   /* first pool in class? */
      mem->small_list[pool_id] = hdr_ptr;
    else
      prev_hdr_ptr->hdr.next = hdr_ptr;
  }
 
  /* OK, allocate the object from the current pool */
  data_ptr = (char *) (hdr_ptr + 1); /* point to first data byte in pool */
  data_ptr += hdr_ptr->hdr.bytes_used; /* point to place for object */
  hdr_ptr->hdr.bytes_used += sizeofobject;
  hdr_ptr->hdr.bytes_left -= sizeofobject;
 
  return (void *) data_ptr;
}

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.

{
  long bytesperrow, file_offset, byte_count, rows, thisrow, i;
 
  bytesperrow = (long) ptr->blocksperrow * SIZEOF(JBLOCK);
  file_offset = (long) ptr->cur_start_row * bytesperrow;
  /* Loop to read or write each allocation chunk in mem_buffer */
  for (i = 0; i < (long) ptr->rows_in_mem; i += ptr->rowsperchunk) {
    /* One chunk, but check for short chunk at end of buffer */
    rows = MIN((long) ptr->rowsperchunk, (long) ptr->rows_in_mem - i);
    /* Transfer no more than is currently defined */
    thisrow = (long) ptr->cur_start_row + i;
    rows = MIN(rows, (long) ptr->first_undef_row - thisrow);
    /* Transfer no more than fits in file */
    rows = MIN(rows, (long) ptr->rows_in_array - thisrow);
    if (rows <= 0)      /* this chunk might be past end of file! */
      break;
    byte_count = rows * bytesperrow;
    if (writing)
      (*ptr->b_s_info.write_backing_store) (cinfo, & ptr->b_s_info,
                        (void FAR *) ptr->mem_buffer[i],
                        file_offset, byte_count);
    else
      (*ptr->b_s_info.read_backing_store) (cinfo, & ptr->b_s_info,
                       (void FAR *) ptr->mem_buffer[i],
                       file_offset, byte_count);
    file_offset += byte_count;
  }
}

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.

{
  long bytesperrow, file_offset, byte_count, rows, thisrow, i;
 
  bytesperrow = (long) ptr->samplesperrow * SIZEOF(JSAMPLE);
  file_offset = (long) ptr->cur_start_row * bytesperrow;
  /* Loop to read or write each allocation chunk in mem_buffer */
  for (i = 0; i < (long) ptr->rows_in_mem; i += ptr->rowsperchunk) {
    /* One chunk, but check for short chunk at end of buffer */
    rows = MIN((long) ptr->rowsperchunk, (long) ptr->rows_in_mem - i);
    /* Transfer no more than is currently defined */
    thisrow = (long) ptr->cur_start_row + i;
    rows = MIN(rows, (long) ptr->first_undef_row - thisrow);
    /* Transfer no more than fits in file */
    rows = MIN(rows, (long) ptr->rows_in_array - thisrow);
    if (rows <= 0)      /* this chunk might be past end of file! */
      break;
    byte_count = rows * bytesperrow;
    if (writing)
      (*ptr->b_s_info.write_backing_store) (cinfo, & ptr->b_s_info,
                        (void FAR *) ptr->mem_buffer[i],
                        file_offset, byte_count);
    else
      (*ptr->b_s_info.read_backing_store) (cinfo, & ptr->b_s_info,
                       (void FAR *) ptr->mem_buffer[i],
                       file_offset, byte_count);
    file_offset += byte_count;
  }
}

Referenced by access_virt_sarray().

free_pool()

free_pool	(	j_common_ptr	cinfo,
		int	pool_id
	)

Definition at line 927 of file jmemmgr.c.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  small_pool_ptr shdr_ptr;
  large_pool_ptr lhdr_ptr;
  size_t space_freed;
 
  if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
 
#ifdef MEM_STATS
  if (cinfo->err->trace_level > 1)
    print_mem_stats(cinfo, pool_id); /* print pool's memory usage statistics */
#endif
 
  /* If freeing IMAGE pool, close any virtual arrays first */
  if (pool_id == JPOOL_IMAGE) {
    jvirt_sarray_ptr sptr;
    jvirt_barray_ptr bptr;
 
    for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
      if (sptr->b_s_open) { /* there may be no backing store */
    sptr->b_s_open = FALSE; /* prevent recursive close if error */
    (*sptr->b_s_info.close_backing_store) (cinfo, & sptr->b_s_info);
      }
    }
    mem->virt_sarray_list = NULL;
    for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
      if (bptr->b_s_open) { /* there may be no backing store */
    bptr->b_s_open = FALSE; /* prevent recursive close if error */
    (*bptr->b_s_info.close_backing_store) (cinfo, & bptr->b_s_info);
      }
    }
    mem->virt_barray_list = NULL;
  }
 
  /* Release large objects */
  lhdr_ptr = mem->large_list[pool_id];
  mem->large_list[pool_id] = NULL;
 
  while (lhdr_ptr != NULL) {
    large_pool_ptr next_lhdr_ptr = lhdr_ptr->hdr.next;
    space_freed = lhdr_ptr->hdr.bytes_used +
          lhdr_ptr->hdr.bytes_left +
          SIZEOF(large_pool_hdr);
    jpeg_free_large(cinfo, (void FAR *) lhdr_ptr, space_freed);
    mem->total_space_allocated -= space_freed;
    lhdr_ptr = next_lhdr_ptr;
  }
 
  /* Release small objects */
  shdr_ptr = mem->small_list[pool_id];
  mem->small_list[pool_id] = NULL;
 
  while (shdr_ptr != NULL) {
    small_pool_ptr next_shdr_ptr = shdr_ptr->hdr.next;
    space_freed = shdr_ptr->hdr.bytes_used +
          shdr_ptr->hdr.bytes_left +
          SIZEOF(small_pool_hdr);
    jpeg_free_small(cinfo, (void *) shdr_ptr, space_freed);
    mem->total_space_allocated -= space_freed;
    shdr_ptr = next_shdr_ptr;
  }
}

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.

{
  my_mem_ptr mem;
  long max_to_use;
  int pool;
  size_t test_mac;
 
  cinfo->mem = NULL;        /* for safety if init fails */
 
  /* Check for configuration errors.
   * SIZEOF(ALIGN_TYPE) should be a power of 2; otherwise, it probably
   * doesn't reflect any real hardware alignment requirement.
   * The test is a little tricky: for X>0, X and X-1 have no one-bits
   * in common if and only if X is a power of 2, ie has only one one-bit.
   * Some compilers may give an "unreachable code" warning here; ignore it.
   */
  if ((SIZEOF(ALIGN_TYPE) & (SIZEOF(ALIGN_TYPE)-1)) != 0)
    ERREXIT(cinfo, JERR_BAD_ALIGN_TYPE);
  /* MAX_ALLOC_CHUNK must be representable as type size_t, and must be
   * a multiple of SIZEOF(ALIGN_TYPE).
   * Again, an "unreachable code" warning may be ignored here.
   * But a "constant too large" warning means you need to fix MAX_ALLOC_CHUNK.
   */
  test_mac = (size_t) MAX_ALLOC_CHUNK;
  if ((long) test_mac != MAX_ALLOC_CHUNK ||
      (MAX_ALLOC_CHUNK % SIZEOF(ALIGN_TYPE)) != 0)
    ERREXIT(cinfo, JERR_BAD_ALLOC_CHUNK);
 
  max_to_use = jpeg_mem_init(cinfo); /* system-dependent initialization */
 
  /* Attempt to allocate memory manager's control block */
  mem = (my_mem_ptr) jpeg_get_small(cinfo, SIZEOF(my_memory_mgr));
 
  if (mem == NULL) {
    jpeg_mem_term(cinfo);   /* system-dependent cleanup */
    ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 0);
  }
 
  /* OK, fill in the method pointers */
  mem->pub.alloc_small = alloc_small;
  mem->pub.alloc_large = alloc_large;
  mem->pub.alloc_sarray = alloc_sarray;
  mem->pub.alloc_barray = alloc_barray;
  mem->pub.request_virt_sarray = request_virt_sarray;
  mem->pub.request_virt_barray = request_virt_barray;
  mem->pub.realize_virt_arrays = realize_virt_arrays;
  mem->pub.access_virt_sarray = access_virt_sarray;
  mem->pub.access_virt_barray = access_virt_barray;
  mem->pub.free_pool = free_pool;
  mem->pub.self_destruct = self_destruct;
 
  /* Make MAX_ALLOC_CHUNK accessible to other modules */
  mem->pub.max_alloc_chunk = MAX_ALLOC_CHUNK;
 
  /* Initialize working state */
  mem->pub.max_memory_to_use = max_to_use;
 
  for (pool = JPOOL_NUMPOOLS-1; pool >= JPOOL_PERMANENT; pool--) {
    mem->small_list[pool] = NULL;
    mem->large_list[pool] = NULL;
  }
  mem->virt_sarray_list = NULL;
  mem->virt_barray_list = NULL;
 
  mem->total_space_allocated = SIZEOF(my_memory_mgr);
 
  /* Declare ourselves open for business */
  cinfo->mem = &mem->pub;
 
  /* Check for an environment variable JPEGMEM; if found, override the
   * default max_memory setting from jpeg_mem_init.  Note that the
   * surrounding application may again override this value.
   * If your system doesn't support getenv(), define NO_GETENV to disable
   * this feature.
   */
#ifndef NO_GETENV
  { char * memenv;
 
    if ((memenv = getenv("JPEGMEM")) != NULL) {
      char ch = 'x';
 
      if (sscanf(memenv, "%ld%c", &max_to_use, &ch) > 0) {
    if (ch == 'm' || ch == 'M')
      max_to_use *= 1000L;
    mem->pub.max_memory_to_use = max_to_use * 1000L;
      }
    }
  }
#endif
 
}

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.

{
#ifdef MEM_STATS
  cinfo->err->trace_level = 2;  /* force self_destruct to report stats */
#endif
  ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, which);
}

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.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  long bytesperrow, space_per_minheight, maximum_space;
  long avail_mem, minheights, max_minheights;
  jvirt_sarray_ptr sptr;
  jvirt_barray_ptr bptr;
 
  /* Compute the minimum space needed (maxaccess rows in each buffer)
   * and the maximum space needed (full image height in each buffer).
   * These may be of use to the system-dependent jpeg_mem_available routine.
   */
  space_per_minheight = 0;
  maximum_space = 0;
  for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
    if (sptr->mem_buffer == NULL) { /* if not realized yet */
      bytesperrow = (long) sptr->samplesperrow * SIZEOF(JSAMPLE);
      space_per_minheight += (long) sptr->maxaccess * bytesperrow;
      maximum_space += (long) sptr->rows_in_array * bytesperrow;
    }
  }
  for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
    if (bptr->mem_buffer == NULL) { /* if not realized yet */
      bytesperrow = (long) bptr->blocksperrow * SIZEOF(JBLOCK);
      space_per_minheight += (long) bptr->maxaccess * bytesperrow;
      maximum_space += (long) bptr->rows_in_array * bytesperrow;
    }
  }
 
  if (space_per_minheight <= 0)
    return;         /* no unrealized arrays, no work */
 
  /* Determine amount of memory to actually use; this is system-dependent. */
  avail_mem = jpeg_mem_available(cinfo, space_per_minheight, maximum_space,
                 (long) mem->total_space_allocated);
 
  /* If the maximum space needed is available, make all the buffers full
   * height; otherwise parcel it out with the same number of minheights
   * in each buffer.
   */
  if (avail_mem >= maximum_space)
    max_minheights = 1000000000L;
  else {
    max_minheights = avail_mem / space_per_minheight;
    /* If there doesn't seem to be enough space, try to get the minimum
     * anyway.  This allows a "stub" implementation of jpeg_mem_available().
     */
    if (max_minheights <= 0)
      max_minheights = 1;
  }
 
  /* Allocate the in-memory buffers and initialize backing store as needed. */
 
  for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
    if (sptr->mem_buffer == NULL) { /* if not realized yet */
      minheights = ((long) sptr->rows_in_array - 1L) / sptr->maxaccess + 1L;
      if (minheights <= max_minheights) {
    /* This buffer fits in memory */
    sptr->rows_in_mem = sptr->rows_in_array;
      } else {
    /* It doesn't fit in memory, create backing store. */
    sptr->rows_in_mem = (JDIMENSION) (max_minheights * sptr->maxaccess);
    jpeg_open_backing_store(cinfo, & sptr->b_s_info,
                (long) sptr->rows_in_array *
                (long) sptr->samplesperrow *
                (long) SIZEOF(JSAMPLE));
    sptr->b_s_open = TRUE;
      }
      sptr->mem_buffer = alloc_sarray(cinfo, JPOOL_IMAGE,
                      sptr->samplesperrow, sptr->rows_in_mem);
      sptr->rowsperchunk = mem->last_rowsperchunk;
      sptr->cur_start_row = 0;
      sptr->first_undef_row = 0;
      sptr->dirty = FALSE;
    }
  }
 
  for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
    if (bptr->mem_buffer == NULL) { /* if not realized yet */
      minheights = ((long) bptr->rows_in_array - 1L) / bptr->maxaccess + 1L;
      if (minheights <= max_minheights) {
    /* This buffer fits in memory */
    bptr->rows_in_mem = bptr->rows_in_array;
      } else {
    /* It doesn't fit in memory, create backing store. */
    bptr->rows_in_mem = (JDIMENSION) (max_minheights * bptr->maxaccess);
    jpeg_open_backing_store(cinfo, & bptr->b_s_info,
                (long) bptr->rows_in_array *
                (long) bptr->blocksperrow *
                (long) SIZEOF(JBLOCK));
    bptr->b_s_open = TRUE;
      }
      bptr->mem_buffer = alloc_barray(cinfo, JPOOL_IMAGE,
                      bptr->blocksperrow, bptr->rows_in_mem);
      bptr->rowsperchunk = mem->last_rowsperchunk;
      bptr->cur_start_row = 0;
      bptr->first_undef_row = 0;
      bptr->dirty = FALSE;
    }
  }
}

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.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  jvirt_barray_ptr result;
 
  /* Only IMAGE-lifetime virtual arrays are currently supported */
  if (pool_id != JPOOL_IMAGE)
    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
 
  /* get control block */
  result = (jvirt_barray_ptr) alloc_small(cinfo, pool_id,
                      SIZEOF(struct jvirt_barray_control));
 
  result->mem_buffer = NULL;    /* marks array not yet realized */
  result->rows_in_array = numrows;
  result->blocksperrow = blocksperrow;
  result->maxaccess = maxaccess;
  result->pre_zero = pre_zero;
  result->b_s_open = FALSE; /* no associated backing-store object */
  result->next = mem->virt_barray_list; /* add to list of virtual arrays */
  mem->virt_barray_list = result;
 
  return result;
}

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.

{
  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
  jvirt_sarray_ptr result;
 
  /* Only IMAGE-lifetime virtual arrays are currently supported */
  if (pool_id != JPOOL_IMAGE)
    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id); /* safety check */
 
  /* get control block */
  result = (jvirt_sarray_ptr) alloc_small(cinfo, pool_id,
                      SIZEOF(struct jvirt_sarray_control));
 
  result->mem_buffer = NULL;    /* marks array not yet realized */
  result->rows_in_array = numrows;
  result->samplesperrow = samplesperrow;
  result->maxaccess = maxaccess;
  result->pre_zero = pre_zero;
  result->b_s_open = FALSE; /* no associated backing-store object */
  result->next = mem->virt_sarray_list; /* add to list of virtual arrays */
  mem->virt_sarray_list = result;
 
  return result;
}

Referenced by jinit_memory_mgr().

self_destruct()

self_destruct

(

j_common_ptr

cinfo

)

Definition at line 999 of file jmemmgr.c.

{
  int pool;
 
  /* Close all backing store, release all memory.
   * Releasing pools in reverse order might help avoid fragmentation
   * with some (brain-damaged) malloc libraries.
   */
  for (pool = JPOOL_NUMPOOLS-1; pool >= JPOOL_PERMANENT; pool--) {
    free_pool(cinfo, pool);
  }
 
  /* Release the memory manager control block too. */
  jpeg_free_small(cinfo, (void *) cinfo->mem, SIZEOF(my_memory_mgr));
  cinfo->mem = NULL;        /* ensures I will be called only once */
 
  jpeg_mem_term(cinfo);     /* system-dependent cleanup */
}

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().