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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * jmemdos.c
3 *
4 * Copyright (C) 1992-1997, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file provides an MS-DOS-compatible implementation of the system-
9 * dependent portion of the JPEG memory manager. Temporary data can be
10 * stored in extended or expanded memory as well as in regular DOS files.
11 *
12 * If you use this file, you must be sure that NEED_FAR_POINTERS is defined
13 * if you compile in a small-data memory model; it should NOT be defined if
14 * you use a large-data memory model. This file is not recommended if you
15 * are using a flat-memory-space 386 environment such as DJGCC or Watcom C.
16 * Also, this code will NOT work if struct fields are aligned on greater than
17 * 2-byte boundaries.
18 *
19 * Based on code contributed by Ge' Weijers.
20 */
21
22 /*
23 * If you have both extended and expanded memory, you may want to change the
24 * order in which they are tried in jopen_backing_store. On a 286 machine
25 * expanded memory is usually faster, since extended memory access involves
26 * an expensive protected-mode-and-back switch. On 386 and better, extended
27 * memory is usually faster. As distributed, the code tries extended memory
28 * first (what? not everyone has a 386? :-).
29 *
30 * You can disable use of extended/expanded memory entirely by altering these
31 * definitions or overriding them from the Makefile (eg, -DEMS_SUPPORTED=0).
32 */
33
34 #ifndef XMS_SUPPORTED
35 #define XMS_SUPPORTED 1
36 #endif
37 #ifndef EMS_SUPPORTED
38 #define EMS_SUPPORTED 1
39 #endif
40
41
42 #define JPEG_INTERNALS
43 #include "jinclude.h"
44 #include "jpeglib.h"
45 #include "jmemsys.h" /* import the system-dependent declarations */
46
47 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare these */
48 extern void * malloc JPP((size_t size));
49 extern void free JPP((void *ptr));
50 extern char * getenv JPP((const char * name));
51 #endif
52
53 #ifdef NEED_FAR_POINTERS
54
55 #ifdef __TURBOC__
56 /* These definitions work for Borland C (Turbo C) */
57 #include <alloc.h> /* need farmalloc(), farfree() */
58 #define far_malloc(x) farmalloc(x)
59 #define far_free(x) farfree(x)
60 #else
61 /* These definitions work for Microsoft C and compatible compilers */
62 #include <malloc.h> /* need _fmalloc(), _ffree() */
63 #define far_malloc(x) _fmalloc(x)
64 #define far_free(x) _ffree(x)
65 #endif
66
67 #else /* not NEED_FAR_POINTERS */
68
69 #define far_malloc(x) malloc(x)
70 #define far_free(x) free(x)
71
72 #endif /* NEED_FAR_POINTERS */
73
74 #ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
75 #define READ_BINARY "r"
76 #else
77 #define READ_BINARY "rb"
78 #endif
79
80 #ifndef USE_MSDOS_MEMMGR /* make sure user got configuration right */
81 You forgot to define USE_MSDOS_MEMMGR in jconfig.h. /* deliberate syntax error */
82 #endif
83
84 #if MAX_ALLOC_CHUNK >= 65535L /* make sure jconfig.h got this right */
85 MAX_ALLOC_CHUNK should be less than 64K. /* deliberate syntax error */
86 #endif
87
88
89 /*
90 * Declarations for assembly-language support routines (see jmemdosa.asm).
91 *
92 * The functions are declared "far" as are all their pointer arguments;
93 * this ensures the assembly source code will work regardless of the
94 * compiler memory model. We assume "short" is 16 bits, "long" is 32.
95 */
96
97 typedef void far * XMSDRIVER; /* actually a pointer to code */
98 typedef struct { /* registers for calling XMS driver */
99 unsigned short ax, dx, bx;
100 void far * ds_si;
101 } XMScontext;
102 typedef struct { /* registers for calling EMS driver */
103 unsigned short ax, dx, bx;
104 void far * ds_si;
105 } EMScontext;
106
107 extern short far jdos_open JPP((short far * handle, char far * filename));
108 extern short far jdos_close JPP((short handle));
109 extern short far jdos_seek JPP((short handle, long offset));
110 extern short far jdos_read JPP((short handle, void far * buffer,
111 unsigned short count));
112 extern short far jdos_write JPP((short handle, void far * buffer,
113 unsigned short count));
114 extern void far jxms_getdriver JPP((XMSDRIVER far *));
115 extern void far jxms_calldriver JPP((XMSDRIVER, XMScontext far *));
116 extern short far jems_available JPP((void));
117 extern void far jems_calldriver JPP((EMScontext far *));
118
119
120 /*
121 * Selection of a file name for a temporary file.
122 * This is highly system-dependent, and you may want to customize it.
123 */
124
125 static int next_file_num; /* to distinguish among several temp files */
126
127 LOCAL(void)
128 select_file_name (char * fname)
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 }
158
159
160 /*
161 * Near-memory allocation and freeing are controlled by the regular library
162 * routines malloc() and free().
163 */
164
165 GLOBAL(void *)
166 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
167 {
168 return (void *) malloc(sizeofobject);
169 }
170
171 GLOBAL(void)
172 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
173 {
174 free(object);
175 }
176
177
178 /*
179 * "Large" objects are allocated in far memory, if possible
180 */
181
182 GLOBAL(void FAR *)
183 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
184 {
185 return (void FAR *) far_malloc(sizeofobject);
186 }
187
188 GLOBAL(void)
189 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
190 {
191 far_free(object);
192 }
193
194
195 /*
196 * This routine computes the total memory space available for allocation.
197 * It's impossible to do this in a portable way; our current solution is
198 * to make the user tell us (with a default value set at compile time).
199 * If you can actually get the available space, it's a good idea to subtract
200 * a slop factor of 5% or so.
201 */
202
203 #ifndef DEFAULT_MAX_MEM /* so can override from makefile */
204 #define DEFAULT_MAX_MEM 300000L /* for total usage about 450K */
205 #endif
206
207 GLOBAL(long)
208 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
209 long max_bytes_needed, long already_allocated)
210 {
211 return cinfo->mem->max_memory_to_use - already_allocated;
212 }
213
214
215 /*
216 * Backing store (temporary file) management.
217 * Backing store objects are only used when the value returned by
218 * jpeg_mem_available is less than the total space needed. You can dispense
219 * with these routines if you have plenty of virtual memory; see jmemnobs.c.
220 */
221
222 /*
223 * For MS-DOS we support three types of backing storage:
224 * 1. Conventional DOS files. We access these by direct DOS calls rather
225 * than via the stdio package. This provides a bit better performance,
226 * but the real reason is that the buffers to be read or written are FAR.
227 * The stdio library for small-data memory models can't cope with that.
228 * 2. Extended memory, accessed per the XMS V2.0 specification.
229 * 3. Expanded memory, accessed per the LIM/EMS 4.0 specification.
230 * You'll need copies of those specs to make sense of the related code.
231 * The specs are available by Internet FTP from the SIMTEL archives
232 * (oak.oakland.edu and its various mirror sites). See files
233 * pub/msdos/microsoft/xms20.arc and pub/msdos/info/limems41.zip.
234 */
235
236
237 /*
238 * Access methods for a DOS file.
239 */
240
241
242 METHODDEF(void)
243 read_file_store (j_common_ptr cinfo, backing_store_ptr info,
244 void FAR * buffer_address,
245 long file_offset, long byte_count)
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 }
256
257
258 METHODDEF(void)
259 write_file_store (j_common_ptr cinfo, backing_store_ptr info,
260 void FAR * buffer_address,
261 long file_offset, long byte_count)
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 }
272
273
274 METHODDEF(void)
275 close_file_store (j_common_ptr cinfo, backing_store_ptr info)
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 }
285
286
287 LOCAL(boolean)
288 open_file_store (j_common_ptr cinfo, backing_store_ptr info,
289 long total_bytes_needed)
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 }
306
307
308 /*
309 * Access methods for extended memory.
310 */
311
312 #if XMS_SUPPORTED
313
314 static XMSDRIVER xms_driver; /* saved address of XMS driver */
315
316 typedef union { /* either long offset or real-mode pointer */
317 long offset;
318 void far * ptr;
319 } XMSPTR;
320
321 typedef struct { /* XMS move specification structure */
322 long length;
323 XMSH src_handle;
324 XMSPTR src;
325 XMSH dst_handle;
326 XMSPTR dst;
327 } XMSspec;
328
329 #define ODD(X) (((X) & 1L) != 0)
330
331
332 METHODDEF(void)
333 read_xms_store (j_common_ptr cinfo, backing_store_ptr info,
334 void FAR * buffer_address,
335 long file_offset, long byte_count)
336 {
337 XMScontext ctx;
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 }
363
364
365 METHODDEF(void)
366 write_xms_store (j_common_ptr cinfo, backing_store_ptr info,
367 void FAR * buffer_address,
368 long file_offset, long byte_count)
369 {
370 XMScontext ctx;
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 }
398
399
400 METHODDEF(void)
401 close_xms_store (j_common_ptr cinfo, backing_store_ptr info)
402 {
403 XMScontext ctx;
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 }
411
412
413 LOCAL(boolean)
414 open_xms_store (j_common_ptr cinfo, backing_store_ptr info,
415 long total_bytes_needed)
416 {
417 XMScontext ctx;
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 }
445
446 #endif /* XMS_SUPPORTED */
447
448
449 /*
450 * Access methods for expanded memory.
451 */
452
453 #if EMS_SUPPORTED
454
455 /* The EMS move specification structure requires word and long fields aligned
456 * at odd byte boundaries. Some compilers will align struct fields at even
457 * byte boundaries. While it's usually possible to force byte alignment,
458 * that causes an overall performance penalty and may pose problems in merging
459 * JPEG into a larger application. Instead we accept some rather dirty code
460 * here. Note this code would fail if the hardware did not allow odd-byte
461 * word & long accesses, but all 80x86 CPUs do.
462 */
463
464 typedef void far * EMSPTR;
465
466 typedef union { /* EMS move specification structure */
467 long length; /* It's easy to access first 4 bytes */
468 char bytes[18]; /* Misaligned fields in here! */
469 } EMSspec;
470
471 /* Macros for accessing misaligned fields */
472 #define FIELD_AT(spec,offset,type) (*((type *) &(spec.bytes[offset])))
473 #define SRC_TYPE(spec) FIELD_AT(spec,4,char)
474 #define SRC_HANDLE(spec) FIELD_AT(spec,5,EMSH)
475 #define SRC_OFFSET(spec) FIELD_AT(spec,7,unsigned short)
476 #define SRC_PAGE(spec) FIELD_AT(spec,9,unsigned short)
477 #define SRC_PTR(spec) FIELD_AT(spec,7,EMSPTR)
478 #define DST_TYPE(spec) FIELD_AT(spec,11,char)
479 #define DST_HANDLE(spec) FIELD_AT(spec,12,EMSH)
480 #define DST_OFFSET(spec) FIELD_AT(spec,14,unsigned short)
481 #define DST_PAGE(spec) FIELD_AT(spec,16,unsigned short)
482 #define DST_PTR(spec) FIELD_AT(spec,14,EMSPTR)
483
484 #define EMSPAGESIZE 16384L /* gospel, see the EMS specs */
485
486 #define HIBYTE(W) (((W) >> 8) & 0xFF)
487 #define LOBYTE(W) ((W) & 0xFF)
488
489
490 METHODDEF(void)
491 read_ems_store (j_common_ptr cinfo, backing_store_ptr info,
492 void FAR * buffer_address,
493 long file_offset, long byte_count)
494 {
495 EMScontext ctx;
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 }
513
514
515 METHODDEF(void)
516 write_ems_store (j_common_ptr cinfo, backing_store_ptr info,
517 void FAR * buffer_address,
518 long file_offset, long byte_count)
519 {
520 EMScontext ctx;
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 }
538
539
540 METHODDEF(void)
541 close_ems_store (j_common_ptr cinfo, backing_store_ptr info)
542 {
543 EMScontext ctx;
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 }
551
552
553 LOCAL(boolean)
554 open_ems_store (j_common_ptr cinfo, backing_store_ptr info,
555 long total_bytes_needed)
556 {
557 EMScontext ctx;
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 }
590
591 #endif /* EMS_SUPPORTED */
592
593
594 /*
595 * Initial opening of a backing-store object.
596 */
597
598 GLOBAL(void)
599 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
600 long total_bytes_needed)
601 {
602 /* Try extended memory, then expanded memory, then regular file. */
603 #if XMS_SUPPORTED
604 if (open_xms_store(cinfo, info, total_bytes_needed))
605 return;
606 #endif
607 #if EMS_SUPPORTED
608 if (open_ems_store(cinfo, info, total_bytes_needed))
609 return;
610 #endif
611 if (open_file_store(cinfo, info, total_bytes_needed))
612 return;
613 ERREXITS(cinfo, JERR_TFILE_CREATE, "");
614 }
615
616
617 /*
618 * These routines take care of any system-dependent initialization and
619 * cleanup required.
620 */
621
622 GLOBAL(long)
623 jpeg_mem_init (j_common_ptr cinfo)
624 {
625 next_file_num = 0; /* initialize temp file name generator */
626 return DEFAULT_MAX_MEM; /* default for max_memory_to_use */
627 }
628
629 GLOBAL(void)
630 jpeg_mem_term (j_common_ptr cinfo)
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 }