ReactOS 0.4.15-dev-5667-ged97270
jmemdos.c File Reference
#include "jinclude.h"
#include "jpeglib.h"
#include "jmemsys.h"
Include dependency graph for jmemdos.c:

Go to the source code of this file.

Classes

struct  XMScontext
 
struct  EMScontext
 
union  XMSPTR
 
struct  XMSspec
 
union  EMSspec
 

Macros

#define XMS_SUPPORTED   1
 
#define EMS_SUPPORTED   1
 
#define JPEG_INTERNALS
 
#define far_malloc(x)   malloc(x)
 
#define far_free(x)   free(x)
 
#define READ_BINARY   "rb"
 
#define DEFAULT_MAX_MEM   300000L /* for total usage about 450K */
 
#define ODD(X)   (((X) & 1L) != 0)
 
#define FIELD_AT(spec, offset, type)   (*((type *) &(spec.bytes[offset])))
 
#define SRC_TYPE(spec)   FIELD_AT(spec,4,char)
 
#define SRC_HANDLE(spec)   FIELD_AT(spec,5,EMSH)
 
#define SRC_OFFSET(spec)   FIELD_AT(spec,7,unsigned short)
 
#define SRC_PAGE(spec)   FIELD_AT(spec,9,unsigned short)
 
#define SRC_PTR(spec)   FIELD_AT(spec,7,EMSPTR)
 
#define DST_TYPE(spec)   FIELD_AT(spec,11,char)
 
#define DST_HANDLE(spec)   FIELD_AT(spec,12,EMSH)
 
#define DST_OFFSET(spec)   FIELD_AT(spec,14,unsigned short)
 
#define DST_PAGE(spec)   FIELD_AT(spec,16,unsigned short)
 
#define DST_PTR(spec)   FIELD_AT(spec,14,EMSPTR)
 
#define EMSPAGESIZE   16384L /* gospel, see the EMS specs */
 
#define HIBYTE(W)   (((W) >> 8) & 0xFF)
 
#define LOBYTE(W)   ((W) & 0xFF)
 

Typedefs

typedef void farEMSPTR
 

Functions

void *malloc JPP ((size_t size))
 
void free JPP ((void *ptr))
 
char *getenv JPP ((const char *name))
 
short far jdos_open JPP ((short far *handle, char far *filename))
 
short far jdos_close JPP ((short handle))
 
short far jdos_seek JPP ((short handle, long offset))
 
short far jdos_read JPP ((short handle, void far *buffer, unsigned short count))
 
void far jxms_getdriver JPP ((XMSDRIVER far *))
 
void far jxms_calldriver JPP ((XMSDRIVER, XMScontext far *))
 
short far jems_available JPP ((void))
 
void far jems_calldriver JPP ((EMScontext far *))
 
 select_file_name (char *fname)
 
 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
 
 jpeg_free_small (j_common_ptr cinfo, void *object, size_t sizeofobject)
 
 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
 
 jpeg_free_large (j_common_ptr cinfo, void FAR *object, size_t sizeofobject)
 
 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, long max_bytes_needed, long already_allocated)
 
 read_file_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 
 write_file_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 
 close_file_store (j_common_ptr cinfo, backing_store_ptr info)
 
 open_file_store (j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
 
 read_xms_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 
 write_xms_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 
 close_xms_store (j_common_ptr cinfo, backing_store_ptr info)
 
 open_xms_store (j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
 
 read_ems_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 
 write_ems_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 
 close_ems_store (j_common_ptr cinfo, backing_store_ptr info)
 
 open_ems_store (j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
 
 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
 
 jpeg_mem_init (j_common_ptr cinfo)
 
 jpeg_mem_term (j_common_ptr cinfo)
 

Variables

You forgot to define USE_MSDOS_MEMMGR in jconfig h typedef void farXMSDRIVER
 
static int next_file_num
 
static XMSDRIVER xms_driver
 

Macro Definition Documentation

◆ DEFAULT_MAX_MEM

#define DEFAULT_MAX_MEM   300000L /* for total usage about 450K */

Definition at line 204 of file jmemdos.c.

◆ DST_HANDLE

#define DST_HANDLE (   spec)    FIELD_AT(spec,12,EMSH)

Definition at line 479 of file jmemdos.c.

◆ DST_OFFSET

#define DST_OFFSET (   spec)    FIELD_AT(spec,14,unsigned short)

Definition at line 480 of file jmemdos.c.

◆ DST_PAGE

#define DST_PAGE (   spec)    FIELD_AT(spec,16,unsigned short)

Definition at line 481 of file jmemdos.c.

◆ DST_PTR

#define DST_PTR (   spec)    FIELD_AT(spec,14,EMSPTR)

Definition at line 482 of file jmemdos.c.

◆ DST_TYPE

#define DST_TYPE (   spec)    FIELD_AT(spec,11,char)

Definition at line 478 of file jmemdos.c.

◆ EMS_SUPPORTED

#define EMS_SUPPORTED   1

Definition at line 38 of file jmemdos.c.

◆ EMSPAGESIZE

#define EMSPAGESIZE   16384L /* gospel, see the EMS specs */

Definition at line 484 of file jmemdos.c.

◆ far_free

#define far_free (   x)    free(x)

Definition at line 70 of file jmemdos.c.

◆ far_malloc

#define far_malloc (   x)    malloc(x)

Definition at line 69 of file jmemdos.c.

◆ FIELD_AT

#define FIELD_AT (   spec,
  offset,
  type 
)    (*((type *) &(spec.bytes[offset])))

Definition at line 472 of file jmemdos.c.

◆ HIBYTE

#define HIBYTE (   W)    (((W) >> 8) & 0xFF)

Definition at line 486 of file jmemdos.c.

◆ JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 42 of file jmemdos.c.

◆ LOBYTE

#define LOBYTE (   W)    ((W) & 0xFF)

Definition at line 487 of file jmemdos.c.

◆ ODD

#define ODD (   X)    (((X) & 1L) != 0)

Definition at line 329 of file jmemdos.c.

◆ READ_BINARY

#define READ_BINARY   "rb"

Definition at line 77 of file jmemdos.c.

◆ SRC_HANDLE

#define SRC_HANDLE (   spec)    FIELD_AT(spec,5,EMSH)

Definition at line 474 of file jmemdos.c.

◆ SRC_OFFSET

#define SRC_OFFSET (   spec)    FIELD_AT(spec,7,unsigned short)

Definition at line 475 of file jmemdos.c.

◆ SRC_PAGE

#define SRC_PAGE (   spec)    FIELD_AT(spec,9,unsigned short)

Definition at line 476 of file jmemdos.c.

◆ SRC_PTR

#define SRC_PTR (   spec)    FIELD_AT(spec,7,EMSPTR)

Definition at line 477 of file jmemdos.c.

◆ SRC_TYPE

#define SRC_TYPE (   spec)    FIELD_AT(spec,4,char)

Definition at line 473 of file jmemdos.c.

◆ XMS_SUPPORTED

#define XMS_SUPPORTED   1

Definition at line 35 of file jmemdos.c.

Typedef Documentation

◆ EMSPTR

typedef void far* EMSPTR

Definition at line 464 of file jmemdos.c.

Function Documentation

◆ close_ems_store()

close_ems_store ( j_common_ptr  cinfo,
backing_store_ptr  info 
)

Definition at line 541 of file jmemdos.c.

542{
544
545 ctx.ax = 0x4500;
546 ctx.dx = info->handle.ems_handle;
547 jems_calldriver((EMScontext far *) & ctx);
548 TRACEMS1(cinfo, 1, JTRC_EMS_CLOSE, info->handle.ems_handle);
549 /* we ignore any error return from the driver */
550}
#define TRACEMS1(cinfo, lvl, code, p1)
Definition: jerror.h:268
#define far
Definition: windef.h:114

Referenced by open_ems_store().

◆ close_file_store()

close_file_store ( j_common_ptr  cinfo,
backing_store_ptr  info 
)

Definition at line 275 of file jmemdos.c.

276{
277 jdos_close(info->handle.file_handle); /* close the file */
278 remove(info->temp_name); /* delete the file */
279/* If your system doesn't have remove(), try unlink() instead.
280 * remove() is the ANSI-standard name for this function, but
281 * unlink() was more common in pre-ANSI systems.
282 */
283 TRACEMSS(cinfo, 1, JTRC_TFILE_CLOSE, info->temp_name);
284}
#define TRACEMSS(cinfo, lvl, code, str)
Definition: jerror.h:299
int remove
Definition: msacm.c:1366

Referenced by open_file_store().

◆ close_xms_store()

close_xms_store ( j_common_ptr  cinfo,
backing_store_ptr  info 
)

Definition at line 401 of file jmemdos.c.

402{
404
405 ctx.dx = info->handle.xms_handle;
406 ctx.ax = 0x0a00;
407 jxms_calldriver(xms_driver, (XMScontext far *) & ctx);
408 TRACEMS1(cinfo, 1, JTRC_XMS_CLOSE, info->handle.xms_handle);
409 /* we ignore any error return from the driver */
410}
static XMSDRIVER xms_driver
Definition: jmemdos.c:314

Referenced by open_xms_store().

◆ jpeg_free_large()

jpeg_free_large ( j_common_ptr  cinfo,
void FAR object,
size_t  sizeofobject 
)

Definition at line 189 of file jmemdos.c.

190{
191 far_free(object);
192}
#define far_free(x)
Definition: jmemdos.c:70

◆ jpeg_free_small()

jpeg_free_small ( j_common_ptr  cinfo,
void object,
size_t  sizeofobject 
)

Definition at line 172 of file jmemdos.c.

173{
174 free(object);
175}
#define free
Definition: debug_ros.c:5

◆ jpeg_get_large()

jpeg_get_large ( j_common_ptr  cinfo,
size_t  sizeofobject 
)

Definition at line 183 of file jmemdos.c.

184{
185 return (void FAR *) far_malloc(sizeofobject);
186}
#define FAR
Definition: zlib.h:34
#define far_malloc(x)
Definition: jmemdos.c:69
size_t sizeofobject
Definition: jmemsys.h:47

◆ jpeg_get_small()

jpeg_get_small ( j_common_ptr  cinfo,
size_t  sizeofobject 
)

Definition at line 166 of file jmemdos.c.

167{
168 return (void *) malloc(sizeofobject);
169}
#define malloc
Definition: debug_ros.c:4

◆ jpeg_mem_available()

jpeg_mem_available ( j_common_ptr  cinfo,
long  min_bytes_needed,
long  max_bytes_needed,
long  already_allocated 
)

Definition at line 208 of file jmemdos.c.

210{
211 return cinfo->mem->max_memory_to_use - already_allocated;
212}
long long long already_allocated
Definition: jmemsys.h:106

◆ jpeg_mem_init()

jpeg_mem_init ( j_common_ptr  cinfo)

Definition at line 623 of file jmemdos.c.

624{
625 next_file_num = 0; /* initialize temp file name generator */
626 return DEFAULT_MAX_MEM; /* default for max_memory_to_use */
627}
#define DEFAULT_MAX_MEM
Definition: jmemdos.c:204
static int next_file_num
Definition: jmemdos.c:125

◆ jpeg_mem_term()

jpeg_mem_term ( j_common_ptr  cinfo)

Definition at line 630 of file jmemdos.c.

631{
632 /* Microsoft C, at least in v6.00A, will not successfully reclaim freed
633 * blocks of size > 32Kbytes unless we give it a kick in the rear, like so:
634 */
635#ifdef NEED_FHEAPMIN
636 _fheapmin();
637#endif
638}

◆ jpeg_open_backing_store()

jpeg_open_backing_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
long  total_bytes_needed 
)

Definition at line 599 of file jmemdos.c.

601{
602 /* Try extended memory, then expanded memory, then regular file. */
603#if XMS_SUPPORTED
605 return;
606#endif
607#if EMS_SUPPORTED
609 return;
610#endif
612 return;
613 ERREXITS(cinfo, JERR_TFILE_CREATE, "");
614}
#define ERREXITS(cinfo, code, str)
Definition: jerror.h:243
open_file_store(j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
Definition: jmemdos.c:288
open_xms_store(j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
Definition: jmemdos.c:414
open_ems_store(j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
Definition: jmemdos.c:554
backing_store_ptr long total_bytes_needed
Definition: jmemsys.h:182

◆ JPP() [1/11]

char *getenv JPP ( (const char *name )

◆ JPP() [2/11]

void far jems_calldriver JPP ( (EMScontext far *)  )

◆ JPP() [3/11]

short far jdos_open JPP ( (short far *handle, char far *filename )

◆ JPP() [4/11]

short far jdos_close JPP ( (short handle )

◆ JPP() [5/11]

short far jdos_seek JPP ( (short handle, long offset )

◆ JPP() [6/11]

short far jdos_write JPP ( (short handle, void far *buffer, unsigned short count )

◆ JPP() [7/11]

void *malloc JPP ( (size_t size )

◆ JPP() [8/11]

void free JPP ( (void *ptr )

◆ JPP() [9/11]

short far jems_available JPP ( (void )

◆ JPP() [10/11]

void far jxms_getdriver JPP ( (XMSDRIVER far *)  )

◆ JPP() [11/11]

void far jxms_calldriver JPP ( (XMSDRIVER, XMScontext far *)  )

◆ open_ems_store()

open_ems_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
long  total_bytes_needed 
)

Definition at line 554 of file jmemdos.c.

556{
558
559 /* Is EMS driver there? */
560 if (! jems_available())
561 return FALSE;
562
563 /* Get status, make sure EMS is OK */
564 ctx.ax = 0x4000;
565 jems_calldriver((EMScontext far *) & ctx);
566 if (HIBYTE(ctx.ax) != 0)
567 return FALSE;
568
569 /* Get version, must be >= 4.0 */
570 ctx.ax = 0x4600;
571 jems_calldriver((EMScontext far *) & ctx);
572 if (HIBYTE(ctx.ax) != 0 || LOBYTE(ctx.ax) < 0x40)
573 return FALSE;
574
575 /* Try to allocate requested space */
576 ctx.ax = 0x4300;
577 ctx.bx = (unsigned short) ((total_bytes_needed + EMSPAGESIZE-1L) / EMSPAGESIZE);
578 jems_calldriver((EMScontext far *) & ctx);
579 if (HIBYTE(ctx.ax) != 0)
580 return FALSE;
581
582 /* Succeeded, save the handle and away we go */
583 info->handle.ems_handle = ctx.dx;
584 info->read_backing_store = read_ems_store;
585 info->write_backing_store = write_ems_store;
586 info->close_backing_store = close_ems_store;
587 TRACEMS1(cinfo, 1, JTRC_EMS_OPEN, ctx.dx);
588 return TRUE; /* succeeded */
589}
#define TRUE
Definition: types.h:120
#define FALSE
Definition: types.h:117
unsigned short(__cdecl typeof(TIFFCurrentDirectory))(struct tiff *)
Definition: typeof.h:94
#define LOBYTE(W)
Definition: jmemdos.c:487
#define HIBYTE(W)
Definition: jmemdos.c:486
write_ems_store(j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
Definition: jmemdos.c:516
close_ems_store(j_common_ptr cinfo, backing_store_ptr info)
Definition: jmemdos.c:541
#define EMSPAGESIZE
Definition: jmemdos.c:484
read_ems_store(j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
Definition: jmemdos.c:491

Referenced by jpeg_open_backing_store().

◆ open_file_store()

open_file_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
long  total_bytes_needed 
)

Definition at line 288 of file jmemdos.c.

290{
291 short handle;
292
293 select_file_name(info->temp_name);
294 if (jdos_open((short far *) & handle, (char far *) info->temp_name)) {
295 /* might as well exit since jpeg_open_backing_store will fail anyway */
296 ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name);
297 return FALSE;
298 }
299 info->handle.file_handle = handle;
300 info->read_backing_store = read_file_store;
301 info->write_backing_store = write_file_store;
302 info->close_backing_store = close_file_store;
303 TRACEMSS(cinfo, 1, JTRC_TFILE_OPEN, info->temp_name);
304 return TRUE; /* succeeded */
305}
select_file_name(char *fname)
Definition: jmemdos.c:128
close_file_store(j_common_ptr cinfo, backing_store_ptr info)
Definition: jmemdos.c:275
read_file_store(j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
Definition: jmemdos.c:243
write_file_store(j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
Definition: jmemdos.c:259

Referenced by jpeg_open_backing_store().

◆ open_xms_store()

open_xms_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
long  total_bytes_needed 
)

Definition at line 414 of file jmemdos.c.

416{
418
419 /* Get address of XMS driver */
420 jxms_getdriver((XMSDRIVER far *) & xms_driver);
421 if (xms_driver == NULL)
422 return FALSE; /* no driver to be had */
423
424 /* Get version number, must be >= 2.00 */
425 ctx.ax = 0x0000;
426 jxms_calldriver(xms_driver, (XMScontext far *) & ctx);
427 if (ctx.ax < (unsigned short) 0x0200)
428 return FALSE;
429
430 /* Try to get space (expressed in kilobytes) */
431 ctx.dx = (unsigned short) ((total_bytes_needed + 1023L) >> 10);
432 ctx.ax = 0x0900;
433 jxms_calldriver(xms_driver, (XMScontext far *) & ctx);
434 if (ctx.ax != 1)
435 return FALSE;
436
437 /* Succeeded, save the handle and away we go */
438 info->handle.xms_handle = ctx.dx;
439 info->read_backing_store = read_xms_store;
440 info->write_backing_store = write_xms_store;
441 info->close_backing_store = close_xms_store;
442 TRACEMS1(cinfo, 1, JTRC_XMS_OPEN, ctx.dx);
443 return TRUE; /* succeeded */
444}
#define NULL
Definition: types.h:112
write_xms_store(j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
Definition: jmemdos.c:366
read_xms_store(j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
Definition: jmemdos.c:333
You forgot to define USE_MSDOS_MEMMGR in jconfig h typedef void far * XMSDRIVER
Definition: jmemdos.c:97
close_xms_store(j_common_ptr cinfo, backing_store_ptr info)
Definition: jmemdos.c:401

Referenced by jpeg_open_backing_store().

◆ read_ems_store()

read_ems_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
void FAR buffer_address,
long  file_offset,
long  byte_count 
)

Definition at line 491 of file jmemdos.c.

494{
496 EMSspec spec;
497
498 spec.length = byte_count;
499 SRC_TYPE(spec) = 1;
500 SRC_HANDLE(spec) = info->handle.ems_handle;
501 SRC_PAGE(spec) = (unsigned short) (file_offset / EMSPAGESIZE);
502 SRC_OFFSET(spec) = (unsigned short) (file_offset % EMSPAGESIZE);
503 DST_TYPE(spec) = 0;
504 DST_HANDLE(spec) = 0;
505 DST_PTR(spec) = buffer_address;
506
507 ctx.ds_si = (void far *) & spec;
508 ctx.ax = 0x5700; /* move memory region */
509 jems_calldriver((EMScontext far *) & ctx);
510 if (HIBYTE(ctx.ax) != 0)
511 ERREXIT(cinfo, JERR_EMS_READ);
512}
#define DST_HANDLE(spec)
Definition: jmemdos.c:479
#define SRC_OFFSET(spec)
Definition: jmemdos.c:475
#define SRC_PAGE(spec)
Definition: jmemdos.c:476
#define DST_PTR(spec)
Definition: jmemdos.c:482
#define DST_TYPE(spec)
Definition: jmemdos.c:478
#define SRC_HANDLE(spec)
Definition: jmemdos.c:474
#define SRC_TYPE(spec)
Definition: jmemdos.c:473
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
long length
Definition: jmemdos.c:467

Referenced by open_ems_store().

◆ read_file_store()

read_file_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
void FAR buffer_address,
long  file_offset,
long  byte_count 
)

Definition at line 243 of file jmemdos.c.

246{
247 if (jdos_seek(info->handle.file_handle, file_offset))
248 ERREXIT(cinfo, JERR_TFILE_SEEK);
249 /* Since MAX_ALLOC_CHUNK is less than 64K, byte_count will be too. */
250 if (byte_count > 65535L) /* safety check */
251 ERREXIT(cinfo, JERR_BAD_ALLOC_CHUNK);
252 if (jdos_read(info->handle.file_handle, buffer_address,
253 (unsigned short) byte_count))
254 ERREXIT(cinfo, JERR_TFILE_READ);
255}

Referenced by open_file_store().

◆ read_xms_store()

read_xms_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
void FAR buffer_address,
long  file_offset,
long  byte_count 
)

Definition at line 333 of file jmemdos.c.

336{
338 XMSspec spec;
339 char endbuffer[2];
340
341 /* The XMS driver can't cope with an odd length, so handle the last byte
342 * specially if byte_count is odd. We don't expect this to be common.
343 */
344
345 spec.length = byte_count & (~ 1L);
346 spec.src_handle = info->handle.xms_handle;
347 spec.src.offset = file_offset;
348 spec.dst_handle = 0;
349 spec.dst.ptr = buffer_address;
350
351 ctx.ds_si = (void far *) & spec;
352 ctx.ax = 0x0b00; /* EMB move */
353 jxms_calldriver(xms_driver, (XMScontext far *) & ctx);
354 if (ctx.ax != 1)
355 ERREXIT(cinfo, JERR_XMS_READ);
356
357 if (ODD(byte_count)) {
358 read_xms_store(cinfo, info, (void FAR *) endbuffer,
359 file_offset + byte_count - 1L, 2L);
360 ((char FAR *) buffer_address)[byte_count - 1L] = endbuffer[0];
361 }
362}
#define ODD(X)
Definition: jmemdos.c:329
XMSH src_handle
Definition: jmemdos.c:323
XMSPTR src
Definition: jmemdos.c:324
XMSH dst_handle
Definition: jmemdos.c:325
XMSPTR dst
Definition: jmemdos.c:326
long length
Definition: jmemdos.c:322
long offset
Definition: jmemdos.c:317
void far * ptr
Definition: jmemdos.c:318

Referenced by open_xms_store(), read_xms_store(), and write_xms_store().

◆ select_file_name()

select_file_name ( char fname)

Definition at line 128 of file jmemdos.c.

129{
130 const char * env;
131 char * ptr;
132 FILE * tfile;
133
134 /* Keep generating file names till we find one that's not in use */
135 for (;;) {
136 /* Get temp directory name from environment TMP or TEMP variable;
137 * if none, use "."
138 */
139 if ((env = (const char *) getenv("TMP")) == NULL)
140 if ((env = (const char *) getenv("TEMP")) == NULL)
141 env = ".";
142 if (*env == '\0') /* null string means "." */
143 env = ".";
144 ptr = fname; /* copy name to fname */
145 while (*env != '\0')
146 *ptr++ = *env++;
147 if (ptr[-1] != '\\' && ptr[-1] != '/')
148 *ptr++ = '\\'; /* append backslash if not in env variable */
149 /* Append a suitable file name */
150 next_file_num++; /* advance counter */
151 sprintf(ptr, "JPG%03d.TMP", next_file_num);
152 /* Probe to see if file name is already in use */
153 if ((tfile = fopen(fname, READ_BINARY)) == NULL)
154 break;
155 fclose(tfile); /* oops, it's there; close tfile & try again */
156 }
157}
static LPCWSTR LPCWSTR LPCWSTR env
Definition: db.cpp:170
_Check_return_ _CRTIMP FILE *__cdecl fopen(_In_z_ const char *_Filename, _In_z_ const char *_Mode)
_Check_return_opt_ _CRTIMP int __cdecl fclose(_Inout_ FILE *_File)
_Check_return_ char *__cdecl getenv(_In_z_ const char *_VarName)
#define READ_BINARY
Definition: jmemdos.c:77
static PVOID ptr
Definition: dispmode.c:27
#define sprintf(buf, format,...)
Definition: sprintf.c:55

Referenced by open_file_store().

◆ write_ems_store()

write_ems_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
void FAR buffer_address,
long  file_offset,
long  byte_count 
)

Definition at line 516 of file jmemdos.c.

519{
521 EMSspec spec;
522
523 spec.length = byte_count;
524 SRC_TYPE(spec) = 0;
525 SRC_HANDLE(spec) = 0;
526 SRC_PTR(spec) = buffer_address;
527 DST_TYPE(spec) = 1;
528 DST_HANDLE(spec) = info->handle.ems_handle;
529 DST_PAGE(spec) = (unsigned short) (file_offset / EMSPAGESIZE);
530 DST_OFFSET(spec) = (unsigned short) (file_offset % EMSPAGESIZE);
531
532 ctx.ds_si = (void far *) & spec;
533 ctx.ax = 0x5700; /* move memory region */
534 jems_calldriver((EMScontext far *) & ctx);
535 if (HIBYTE(ctx.ax) != 0)
536 ERREXIT(cinfo, JERR_EMS_WRITE);
537}
#define DST_PAGE(spec)
Definition: jmemdos.c:481
#define SRC_PTR(spec)
Definition: jmemdos.c:477
#define DST_OFFSET(spec)
Definition: jmemdos.c:480

Referenced by open_ems_store().

◆ write_file_store()

write_file_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
void FAR buffer_address,
long  file_offset,
long  byte_count 
)

Definition at line 259 of file jmemdos.c.

262{
263 if (jdos_seek(info->handle.file_handle, file_offset))
264 ERREXIT(cinfo, JERR_TFILE_SEEK);
265 /* Since MAX_ALLOC_CHUNK is less than 64K, byte_count will be too. */
266 if (byte_count > 65535L) /* safety check */
267 ERREXIT(cinfo, JERR_BAD_ALLOC_CHUNK);
268 if (jdos_write(info->handle.file_handle, buffer_address,
269 (unsigned short) byte_count))
270 ERREXIT(cinfo, JERR_TFILE_WRITE);
271}

Referenced by open_file_store().

◆ write_xms_store()

write_xms_store ( j_common_ptr  cinfo,
backing_store_ptr  info,
void FAR buffer_address,
long  file_offset,
long  byte_count 
)

Definition at line 366 of file jmemdos.c.

369{
371 XMSspec spec;
372 char endbuffer[2];
373
374 /* The XMS driver can't cope with an odd length, so handle the last byte
375 * specially if byte_count is odd. We don't expect this to be common.
376 */
377
378 spec.length = byte_count & (~ 1L);
379 spec.src_handle = 0;
380 spec.src.ptr = buffer_address;
381 spec.dst_handle = info->handle.xms_handle;
382 spec.dst.offset = file_offset;
383
384 ctx.ds_si = (void far *) & spec;
385 ctx.ax = 0x0b00; /* EMB move */
386 jxms_calldriver(xms_driver, (XMScontext far *) & ctx);
387 if (ctx.ax != 1)
388 ERREXIT(cinfo, JERR_XMS_WRITE);
389
390 if (ODD(byte_count)) {
391 read_xms_store(cinfo, info, (void FAR *) endbuffer,
392 file_offset + byte_count - 1L, 2L);
393 endbuffer[0] = ((char FAR *) buffer_address)[byte_count - 1L];
394 write_xms_store(cinfo, info, (void FAR *) endbuffer,
395 file_offset + byte_count - 1L, 2L);
396 }
397}

Referenced by open_xms_store(), and write_xms_store().

Variable Documentation

◆ next_file_num

int next_file_num
static

Definition at line 125 of file jmemdos.c.

Referenced by jpeg_mem_init(), and select_file_name().

◆ xms_driver

XMSDRIVER xms_driver
static

Definition at line 314 of file jmemdos.c.

Referenced by close_xms_store(), open_xms_store(), read_xms_store(), and write_xms_store().

◆ XMSDRIVER

You forgot to define USE_MSDOS_MEMMGR in jconfig h typedef void far* XMSDRIVER

Definition at line 97 of file jmemdos.c.

Referenced by open_xms_store().