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author | David Walter Seikel | 2014-01-13 19:47:58 +1000 |
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committer | David Walter Seikel | 2014-01-13 19:47:58 +1000 |
commit | f9158592e1478b2013afc7041d9ed041cf2d2f4a (patch) | |
tree | b16e389d7988700e21b4c9741044cefa536dcbae /libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jmemdos.c | |
parent | Libraries readme updated with change markers and more of the Irrlicht changes. (diff) | |
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Update Irrlicht to 1.8.1. Include actual change markers this time. lol
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jmemdos.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jmemdos.c | 638 |
1 files changed, 0 insertions, 638 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jmemdos.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jmemdos.c deleted file mode 100644 index 60b45c6..0000000 --- a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jmemdos.c +++ /dev/null | |||
@@ -1,638 +0,0 @@ | |||
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 | } | ||