| 1 | /* |
| 2 | * BIGFONT extension for sharing font metrics between clients (if possible) |
| 3 | * and for transmitting font metrics to clients in a compressed form. |
| 4 | * |
| 5 | * Copyright (c) 1999-2000 Bruno Haible |
| 6 | * Copyright (c) 1999-2000 The XFree86 Project, Inc. |
| 7 | */ |
| 8 | |
| 9 | /* THIS IS NOT AN X CONSORTIUM STANDARD */ |
| 10 | |
| 11 | /* |
| 12 | * Big fonts suffer from the following: All clients that have opened a |
| 13 | * font can access the complete glyph metrics array (the XFontStruct member |
| 14 | * `per_char') directly, without going through a macro. Moreover these |
| 15 | * glyph metrics are ink metrics, i.e. are not redundant even for a |
| 16 | * fixed-width font. For a Unicode font, the size of this array is 768 KB. |
| 17 | * |
| 18 | * Problems: 1. It eats a lot of memory in each client. 2. All this glyph |
| 19 | * metrics data is piped through the socket when the font is opened. |
| 20 | * |
| 21 | * This extension addresses these two problems for local clients, by using |
| 22 | * shared memory. It also addresses the second problem for non-local clients, |
| 23 | * by compressing the data before transmit by a factor of nearly 6. |
| 24 | * |
| 25 | * If you use this extension, your OS ought to nicely support shared memory. |
| 26 | * This means: Shared memory should be swappable to the swap, and the limits |
| 27 | * should be high enough (SHMMNI at least 64, SHMMAX at least 768 KB, |
| 28 | * SHMALL at least 48 MB). It is a plus if your OS allows shmat() calls |
| 29 | * on segments that have already been marked "removed", because it permits |
| 30 | * these segments to be cleaned up by the OS if the X server is killed with |
| 31 | * signal SIGKILL. |
| 32 | * |
| 33 | * This extension is transparently exploited by Xlib (functions XQueryFont, |
| 34 | * XLoadQueryFont). |
| 35 | */ |
| 36 | |
| 37 | #ifdef HAVE_DIX_CONFIG_H |
| 38 | #include <dix-config.h> |
| 39 | #endif |
| 40 | |
| 41 | #include <sys/types.h> |
| 42 | #ifdef HAS_SHM |
| 43 | #if defined(linux) && (!defined(__GNU_LIBRARY__) || __GNU_LIBRARY__ < 2) |
| 44 | /* libc4 does not define __GNU_LIBRARY__, libc5 defines __GNU_LIBRARY__ as 1 */ |
| 45 | /* Linux libc4 and libc5 only (because glibc doesn't include kernel headers): |
| 46 | Linux 2.0.x and 2.2.x define SHMLBA as PAGE_SIZE, but forget to define |
| 47 | PAGE_SIZE. It is defined in <asm/page.h>. */ |
| 48 | #include <asm/page.h> |
| 49 | #endif |
| 50 | #ifdef SVR4 |
| 51 | #include <sys/sysmacros.h> |
| 52 | #endif |
| 53 | #if defined(__CYGWIN__) |
| 54 | #include <sys/param.h> |
| 55 | #include <sys/sysmacros.h> |
| 56 | #endif |
| 57 | #include <sys/ipc.h> |
| 58 | #include <sys/shm.h> |
| 59 | #include <sys/stat.h> |
| 60 | #include <stdlib.h> |
| 61 | #include <unistd.h> |
| 62 | #include <time.h> |
| 63 | #include <errno.h> |
| 64 | #endif |
| 65 | |
| 66 | #include <X11/X.h> |
| 67 | #include <X11/Xproto.h> |
| 68 | #include "misc.h" |
| 69 | #include "os.h" |
| 70 | #include "dixstruct.h" |
| 71 | #include "gcstruct.h" |
| 72 | #include "dixfontstr.h" |
| 73 | #include "extnsionst.h" |
| 74 | #include "extinit.h" |
| 75 | #include "protocol-versions.h" |
| 76 | |
| 77 | #include <X11/extensions/xf86bigfproto.h> |
| 78 | #include "xf86bigfontsrv.h" |
| 79 | |
| 80 | static void XF86BigfontResetProc(ExtensionEntry * /* extEntry */ |
| 81 | ); |
| 82 | |
| 83 | #ifdef HAS_SHM |
| 84 | |
| 85 | /* A random signature, transmitted to the clients so they can verify that the |
| 86 | shared memory segment they are attaching to was really established by the |
| 87 | X server they are talking to. */ |
| 88 | static CARD32 signature; |
| 89 | |
| 90 | /* Index for additional information stored in a FontRec's devPrivates array. */ |
| 91 | static int FontShmdescIndex; |
| 92 | |
| 93 | static unsigned int pagesize; |
| 94 | |
| 95 | static Bool badSysCall = FALSE; |
| 96 | |
| 97 | #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__) || defined(__DragonFly__) |
| 98 | |
| 99 | #include <sys/signal.h> |
| 100 | |
| 101 | static void |
| 102 | SigSysHandler(int signo) |
| 103 | { |
| 104 | badSysCall = TRUE; |
| 105 | } |
| 106 | |
| 107 | static Bool |
| 108 | CheckForShmSyscall(void) |
| 109 | { |
| 110 | void (*oldHandler) (int); |
| 111 | int shmid = -1; |
| 112 | |
| 113 | /* If no SHM support in the kernel, the bad syscall will generate SIGSYS */ |
| 114 | oldHandler = signal(SIGSYS, SigSysHandler); |
| 115 | |
| 116 | badSysCall = FALSE; |
| 117 | shmid = shmget(IPC_PRIVATE, 4096, IPC_CREAT); |
| 118 | if (shmid != -1) { |
| 119 | /* Successful allocation - clean up */ |
| 120 | shmctl(shmid, IPC_RMID, NULL); |
| 121 | } |
| 122 | else { |
| 123 | /* Allocation failed */ |
| 124 | badSysCall = TRUE; |
| 125 | } |
| 126 | signal(SIGSYS, oldHandler); |
| 127 | return !badSysCall; |
| 128 | } |
| 129 | |
| 130 | #define MUST_CHECK_FOR_SHM_SYSCALL |
| 131 | |
| 132 | #endif |
| 133 | |
| 134 | #endif |
| 135 | |
| 136 | /* ========== Management of shared memory segments ========== */ |
| 137 | |
| 138 | #ifdef HAS_SHM |
| 139 | |
| 140 | #ifdef __linux__ |
| 141 | /* On Linux, shared memory marked as "removed" can still be attached. |
| 142 | Nice feature, because the kernel will automatically free the associated |
| 143 | storage when the server and all clients are gone. */ |
| 144 | #define EARLY_REMOVE |
| 145 | #endif |
| 146 | |
| 147 | typedef struct _ShmDesc { |
| 148 | struct _ShmDesc *next; |
| 149 | struct _ShmDesc **prev; |
| 150 | int shmid; |
| 151 | char *attach_addr; |
| 152 | } ShmDescRec, *ShmDescPtr; |
| 153 | |
| 154 | static ShmDescPtr ShmList = (ShmDescPtr) NULL; |
| 155 | |
| 156 | static ShmDescPtr |
| 157 | shmalloc(unsigned int size) |
| 158 | { |
| 159 | ShmDescPtr pDesc; |
| 160 | int shmid; |
| 161 | char *addr; |
| 162 | |
| 163 | #ifdef MUST_CHECK_FOR_SHM_SYSCALL |
| 164 | if (pagesize == 0) |
| 165 | return (ShmDescPtr) NULL; |
| 166 | #endif |
| 167 | |
| 168 | /* On some older Linux systems, the number of shared memory segments |
| 169 | system-wide is 127. In Linux 2.4, it is 4095. |
| 170 | Therefore there is a tradeoff to be made between allocating a |
| 171 | shared memory segment on one hand, and allocating memory and piping |
| 172 | the glyph metrics on the other hand. If the glyph metrics size is |
| 173 | small, we prefer the traditional way. */ |
| 174 | if (size < 3500) |
| 175 | return (ShmDescPtr) NULL; |
| 176 | |
| 177 | pDesc = malloc(sizeof(ShmDescRec)); |
| 178 | if (!pDesc) |
| 179 | return (ShmDescPtr) NULL; |
| 180 | |
| 181 | size = (size + pagesize - 1) & -pagesize; |
| 182 | shmid = shmget(IPC_PRIVATE, size, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH); |
| 183 | if (shmid == -1) { |
| 184 | ErrorF(XF86BIGFONTNAME " extension: shmget() failed, size = %u, %s\n", |
| 185 | size, strerror(errno)); |
| 186 | free(pDesc); |
| 187 | return (ShmDescPtr) NULL; |
| 188 | } |
| 189 | |
| 190 | if ((addr = shmat(shmid, 0, 0)) == (char *) -1) { |
| 191 | ErrorF(XF86BIGFONTNAME " extension: shmat() failed, size = %u, %s\n", |
| 192 | size, strerror(errno)); |
| 193 | shmctl(shmid, IPC_RMID, (void *) 0); |
| 194 | free(pDesc); |
| 195 | return (ShmDescPtr) NULL; |
| 196 | } |
| 197 | |
| 198 | #ifdef EARLY_REMOVE |
| 199 | shmctl(shmid, IPC_RMID, (void *) 0); |
| 200 | #endif |
| 201 | |
| 202 | pDesc->shmid = shmid; |
| 203 | pDesc->attach_addr = addr; |
| 204 | if (ShmList) |
| 205 | ShmList->prev = &pDesc->next; |
| 206 | pDesc->next = ShmList; |
| 207 | pDesc->prev = &ShmList; |
| 208 | ShmList = pDesc; |
| 209 | |
| 210 | return pDesc; |
| 211 | } |
| 212 | |
| 213 | static void |
| 214 | shmdealloc(ShmDescPtr pDesc) |
| 215 | { |
| 216 | #ifndef EARLY_REMOVE |
| 217 | shmctl(pDesc->shmid, IPC_RMID, (void *) 0); |
| 218 | #endif |
| 219 | shmdt(pDesc->attach_addr); |
| 220 | |
| 221 | if (pDesc->next) |
| 222 | pDesc->next->prev = pDesc->prev; |
| 223 | *pDesc->prev = pDesc->next; |
| 224 | free(pDesc); |
| 225 | } |
| 226 | |
| 227 | #endif |
| 228 | |
| 229 | /* Called when a font is closed. */ |
| 230 | void |
| 231 | XF86BigfontFreeFontShm(FontPtr pFont) |
| 232 | { |
| 233 | #ifdef HAS_SHM |
| 234 | ShmDescPtr pDesc; |
| 235 | |
| 236 | /* If during shutdown of the server, XF86BigfontCleanup() has already |
| 237 | * called shmdealloc() for all segments, we don't need to do it here. |
| 238 | */ |
| 239 | if (!ShmList) |
| 240 | return; |
| 241 | |
| 242 | pDesc = (ShmDescPtr) FontGetPrivate(pFont, FontShmdescIndex); |
| 243 | if (pDesc) |
| 244 | shmdealloc(pDesc); |
| 245 | #endif |
| 246 | } |
| 247 | |
| 248 | /* Called upon fatal signal. */ |
| 249 | void |
| 250 | XF86BigfontCleanup(void) |
| 251 | { |
| 252 | #ifdef HAS_SHM |
| 253 | while (ShmList) |
| 254 | shmdealloc(ShmList); |
| 255 | #endif |
| 256 | } |
| 257 | |
| 258 | /* Called when a server generation dies. */ |
| 259 | static void |
| 260 | XF86BigfontResetProc(ExtensionEntry * extEntry) |
| 261 | { |
| 262 | /* This function is normally called from CloseDownExtensions(), called |
| 263 | * from main(). It will be followed by a call to FreeAllResources(), |
| 264 | * which will call XF86BigfontFreeFontShm() for each font. Thus it |
| 265 | * appears that we do not need to do anything in this function. -- |
| 266 | * But I prefer to write robust code, and not keep shared memory lying |
| 267 | * around when it's not needed any more. (Someone might close down the |
| 268 | * extension without calling FreeAllResources()...) |
| 269 | */ |
| 270 | XF86BigfontCleanup(); |
| 271 | } |
| 272 | |
| 273 | /* ========== Handling of extension specific requests ========== */ |
| 274 | |
| 275 | static int |
| 276 | ProcXF86BigfontQueryVersion(ClientPtr client) |
| 277 | { |
| 278 | xXF86BigfontQueryVersionReply reply; |
| 279 | |
| 280 | REQUEST_SIZE_MATCH(xXF86BigfontQueryVersionReq); |
| 281 | reply = (xXF86BigfontQueryVersionReply) { |
| 282 | .type = X_Reply, |
| 283 | .sequenceNumber = client->sequence, |
| 284 | .length = 0, |
| 285 | .majorVersion = SERVER_XF86BIGFONT_MAJOR_VERSION, |
| 286 | .minorVersion = SERVER_XF86BIGFONT_MINOR_VERSION, |
| 287 | .uid = geteuid(), |
| 288 | .gid = getegid(), |
| 289 | #ifdef HAS_SHM |
| 290 | .signature = signature, |
| 291 | .capabilities = (client->local && !client->swapped) |
| 292 | ? XF86Bigfont_CAP_LocalShm : 0 |
| 293 | #else |
| 294 | .signature = 0, |
| 295 | .capabilities = 0 |
| 296 | #endif |
| 297 | }; |
| 298 | if (client->swapped) { |
| 299 | swaps(&reply.sequenceNumber); |
| 300 | swapl(&reply.length); |
| 301 | swaps(&reply.majorVersion); |
| 302 | swaps(&reply.minorVersion); |
| 303 | swapl(&reply.uid); |
| 304 | swapl(&reply.gid); |
| 305 | swapl(&reply.signature); |
| 306 | } |
| 307 | WriteToClient(client, sizeof(xXF86BigfontQueryVersionReply), &reply); |
| 308 | return Success; |
| 309 | } |
| 310 | |
| 311 | static void |
| 312 | swapCharInfo(xCharInfo * pCI) |
| 313 | { |
| 314 | swaps(&pCI->leftSideBearing); |
| 315 | swaps(&pCI->rightSideBearing); |
| 316 | swaps(&pCI->characterWidth); |
| 317 | swaps(&pCI->ascent); |
| 318 | swaps(&pCI->descent); |
| 319 | swaps(&pCI->attributes); |
| 320 | } |
| 321 | |
| 322 | /* static CARD32 hashCI (xCharInfo *p); */ |
| 323 | #define hashCI(p) \ |
| 324 | (CARD32)(((p->leftSideBearing << 27) + (p->leftSideBearing >> 5) + \ |
| 325 | (p->rightSideBearing << 23) + (p->rightSideBearing >> 9) + \ |
| 326 | (p->characterWidth << 16) + \ |
| 327 | (p->ascent << 11) + (p->descent << 6)) ^ p->attributes) |
| 328 | |
| 329 | static int |
| 330 | ProcXF86BigfontQueryFont(ClientPtr client) |
| 331 | { |
| 332 | FontPtr pFont; |
| 333 | |
| 334 | REQUEST(xXF86BigfontQueryFontReq); |
| 335 | CARD32 stuff_flags; |
| 336 | xCharInfo *pmax; |
| 337 | xCharInfo *pmin; |
| 338 | int nCharInfos; |
| 339 | int shmid; |
| 340 | |
| 341 | #ifdef HAS_SHM |
| 342 | ShmDescPtr pDesc = NULL; |
| 343 | #else |
| 344 | #define pDesc 0 |
| 345 | #endif |
| 346 | xCharInfo *pCI; |
| 347 | CARD16 *pIndex2UniqIndex; |
| 348 | CARD16 *pUniqIndex2Index; |
| 349 | CARD32 nUniqCharInfos; |
| 350 | |
| 351 | #if 0 |
| 352 | REQUEST_SIZE_MATCH(xXF86BigfontQueryFontReq); |
| 353 | #else |
| 354 | switch (client->req_len) { |
| 355 | case 2: /* client with version 1.0 libX11 */ |
| 356 | stuff_flags = (client->local && |
| 357 | !client->swapped ? XF86Bigfont_FLAGS_Shm : 0); |
| 358 | break; |
| 359 | case 3: /* client with version 1.1 libX11 */ |
| 360 | stuff_flags = stuff->flags; |
| 361 | break; |
| 362 | default: |
| 363 | return BadLength; |
| 364 | } |
| 365 | #endif |
| 366 | if (dixLookupFontable(&pFont, stuff->id, client, DixGetAttrAccess) != |
| 367 | Success) |
| 368 | return BadFont; /* procotol spec says only error is BadFont */ |
| 369 | |
| 370 | pmax = FONTINKMAX(pFont); |
| 371 | pmin = FONTINKMIN(pFont); |
| 372 | nCharInfos = |
| 373 | (pmax->rightSideBearing == pmin->rightSideBearing |
| 374 | && pmax->leftSideBearing == pmin->leftSideBearing |
| 375 | && pmax->descent == pmin->descent |
| 376 | && pmax->ascent == pmin->ascent |
| 377 | && pmax->characterWidth == pmin->characterWidth) |
| 378 | ? 0 : N2dChars(pFont); |
| 379 | shmid = -1; |
| 380 | pCI = NULL; |
| 381 | pIndex2UniqIndex = NULL; |
| 382 | pUniqIndex2Index = NULL; |
| 383 | nUniqCharInfos = 0; |
| 384 | |
| 385 | if (nCharInfos > 0) { |
| 386 | #ifdef HAS_SHM |
| 387 | if (!badSysCall) |
| 388 | pDesc = (ShmDescPtr) FontGetPrivate(pFont, FontShmdescIndex); |
| 389 | if (pDesc) { |
| 390 | pCI = (xCharInfo *) pDesc->attach_addr; |
| 391 | if (stuff_flags & XF86Bigfont_FLAGS_Shm) |
| 392 | shmid = pDesc->shmid; |
| 393 | } |
| 394 | else { |
| 395 | if (stuff_flags & XF86Bigfont_FLAGS_Shm && !badSysCall) |
| 396 | pDesc = shmalloc(nCharInfos * sizeof(xCharInfo) |
| 397 | + sizeof(CARD32)); |
| 398 | if (pDesc) { |
| 399 | pCI = (xCharInfo *) pDesc->attach_addr; |
| 400 | shmid = pDesc->shmid; |
| 401 | } |
| 402 | else { |
| 403 | #endif |
| 404 | pCI = malloc(nCharInfos * sizeof(xCharInfo)); |
| 405 | if (!pCI) |
| 406 | return BadAlloc; |
| 407 | #ifdef HAS_SHM |
| 408 | } |
| 409 | #endif |
| 410 | /* Fill nCharInfos starting at pCI. */ |
| 411 | { |
| 412 | xCharInfo *prCI = pCI; |
| 413 | int ninfos = 0; |
| 414 | int ncols = pFont->info.lastCol - pFont->info.firstCol + 1; |
| 415 | int row; |
| 416 | |
| 417 | for (row = pFont->info.firstRow; |
| 418 | row <= pFont->info.lastRow && ninfos < nCharInfos; row++) { |
| 419 | unsigned char chars[512]; |
| 420 | xCharInfo *tmpCharInfos[256]; |
| 421 | unsigned long count; |
| 422 | int col; |
| 423 | unsigned long i; |
| 424 | |
| 425 | i = 0; |
| 426 | for (col = pFont->info.firstCol; |
| 427 | col <= pFont->info.lastCol; col++) { |
| 428 | chars[i++] = row; |
| 429 | chars[i++] = col; |
| 430 | } |
| 431 | (*pFont->get_metrics) (pFont, ncols, chars, TwoD16Bit, |
| 432 | &count, tmpCharInfos); |
| 433 | for (i = 0; i < count && ninfos < nCharInfos; i++) { |
| 434 | *prCI++ = *tmpCharInfos[i]; |
| 435 | ninfos++; |
| 436 | } |
| 437 | } |
| 438 | } |
| 439 | #ifdef HAS_SHM |
| 440 | if (pDesc && !badSysCall) { |
| 441 | *(CARD32 *) (pCI + nCharInfos) = signature; |
| 442 | if (!FontSetPrivate(pFont, FontShmdescIndex, pDesc)) { |
| 443 | shmdealloc(pDesc); |
| 444 | return BadAlloc; |
| 445 | } |
| 446 | } |
| 447 | } |
| 448 | #endif |
| 449 | if (shmid == -1) { |
| 450 | /* Cannot use shared memory, so remove-duplicates the xCharInfos |
| 451 | using a temporary hash table. */ |
| 452 | /* Note that CARD16 is suitable as index type, because |
| 453 | nCharInfos <= 0x10000. */ |
| 454 | CARD32 hashModulus; |
| 455 | CARD16 *pHash2UniqIndex; |
| 456 | CARD16 *pUniqIndex2NextUniqIndex; |
| 457 | CARD32 NextIndex; |
| 458 | CARD32 NextUniqIndex; |
| 459 | CARD16 *tmp; |
| 460 | CARD32 i, j; |
| 461 | |
| 462 | hashModulus = 67; |
| 463 | if (hashModulus > nCharInfos + 1) |
| 464 | hashModulus = nCharInfos + 1; |
| 465 | |
| 466 | tmp = malloc((4 * nCharInfos + 1) * sizeof(CARD16)); |
| 467 | if (!tmp) { |
| 468 | if (!pDesc) |
| 469 | free(pCI); |
| 470 | return BadAlloc; |
| 471 | } |
| 472 | pIndex2UniqIndex = tmp; |
| 473 | /* nCharInfos elements */ |
| 474 | pUniqIndex2Index = tmp + nCharInfos; |
| 475 | /* max. nCharInfos elements */ |
| 476 | pUniqIndex2NextUniqIndex = tmp + 2 * nCharInfos; |
| 477 | /* max. nCharInfos elements */ |
| 478 | pHash2UniqIndex = tmp + 3 * nCharInfos; |
| 479 | /* hashModulus (<= nCharInfos+1) elements */ |
| 480 | |
| 481 | /* Note that we can use 0xffff as end-of-list indicator, because |
| 482 | even if nCharInfos = 0x10000, 0xffff can not occur as valid |
| 483 | entry before the last element has been inserted. And once the |
| 484 | last element has been inserted, we don't need the hash table |
| 485 | any more. */ |
| 486 | for (j = 0; j < hashModulus; j++) |
| 487 | pHash2UniqIndex[j] = (CARD16) (-1); |
| 488 | |
| 489 | NextUniqIndex = 0; |
| 490 | for (NextIndex = 0; NextIndex < nCharInfos; NextIndex++) { |
| 491 | xCharInfo *p = &pCI[NextIndex]; |
| 492 | CARD32 hashCode = hashCI(p) % hashModulus; |
| 493 | |
| 494 | for (i = pHash2UniqIndex[hashCode]; |
| 495 | i != (CARD16) (-1); i = pUniqIndex2NextUniqIndex[i]) { |
| 496 | j = pUniqIndex2Index[i]; |
| 497 | if (pCI[j].leftSideBearing == p->leftSideBearing |
| 498 | && pCI[j].rightSideBearing == p->rightSideBearing |
| 499 | && pCI[j].characterWidth == p->characterWidth |
| 500 | && pCI[j].ascent == p->ascent |
| 501 | && pCI[j].descent == p->descent |
| 502 | && pCI[j].attributes == p->attributes) |
| 503 | break; |
| 504 | } |
| 505 | if (i != (CARD16) (-1)) { |
| 506 | /* Found *p at Index j, UniqIndex i */ |
| 507 | pIndex2UniqIndex[NextIndex] = i; |
| 508 | } |
| 509 | else { |
| 510 | /* Allocate a new entry in the Uniq table */ |
| 511 | if (hashModulus <= 2 * NextUniqIndex |
| 512 | && hashModulus < nCharInfos + 1) { |
| 513 | /* Time to increate hash table size */ |
| 514 | hashModulus = 2 * hashModulus + 1; |
| 515 | if (hashModulus > nCharInfos + 1) |
| 516 | hashModulus = nCharInfos + 1; |
| 517 | for (j = 0; j < hashModulus; j++) |
| 518 | pHash2UniqIndex[j] = (CARD16) (-1); |
| 519 | for (i = 0; i < NextUniqIndex; i++) |
| 520 | pUniqIndex2NextUniqIndex[i] = (CARD16) (-1); |
| 521 | for (i = 0; i < NextUniqIndex; i++) { |
| 522 | j = pUniqIndex2Index[i]; |
| 523 | p = &pCI[j]; |
| 524 | hashCode = hashCI(p) % hashModulus; |
| 525 | pUniqIndex2NextUniqIndex[i] = |
| 526 | pHash2UniqIndex[hashCode]; |
| 527 | pHash2UniqIndex[hashCode] = i; |
| 528 | } |
| 529 | p = &pCI[NextIndex]; |
| 530 | hashCode = hashCI(p) % hashModulus; |
| 531 | } |
| 532 | i = NextUniqIndex++; |
| 533 | pUniqIndex2NextUniqIndex[i] = pHash2UniqIndex[hashCode]; |
| 534 | pHash2UniqIndex[hashCode] = i; |
| 535 | pUniqIndex2Index[i] = NextIndex; |
| 536 | pIndex2UniqIndex[NextIndex] = i; |
| 537 | } |
| 538 | } |
| 539 | nUniqCharInfos = NextUniqIndex; |
| 540 | /* fprintf(stderr, "font metrics: nCharInfos = %d, nUniqCharInfos = %d, hashModulus = %d\n", nCharInfos, nUniqCharInfos, hashModulus); */ |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | { |
| 545 | int nfontprops = pFont->info.nprops; |
| 546 | int rlength = sizeof(xXF86BigfontQueryFontReply) |
| 547 | + nfontprops * sizeof(xFontProp) |
| 548 | + (nCharInfos > 0 && shmid == -1 |
| 549 | ? nUniqCharInfos * sizeof(xCharInfo) |
| 550 | + (nCharInfos + 1) / 2 * 2 * sizeof(CARD16) |
| 551 | : 0); |
| 552 | xXF86BigfontQueryFontReply *reply = calloc(1, rlength); |
| 553 | char *p; |
| 554 | |
| 555 | if (!reply) { |
| 556 | if (nCharInfos > 0) { |
| 557 | if (shmid == -1) |
| 558 | free(pIndex2UniqIndex); |
| 559 | if (!pDesc) |
| 560 | free(pCI); |
| 561 | } |
| 562 | return BadAlloc; |
| 563 | } |
| 564 | reply->type = X_Reply; |
| 565 | reply->length = bytes_to_int32(rlength - sizeof(xGenericReply)); |
| 566 | reply->sequenceNumber = client->sequence; |
| 567 | reply->minBounds = pFont->info.ink_minbounds; |
| 568 | reply->maxBounds = pFont->info.ink_maxbounds; |
| 569 | reply->minCharOrByte2 = pFont->info.firstCol; |
| 570 | reply->maxCharOrByte2 = pFont->info.lastCol; |
| 571 | reply->defaultChar = pFont->info.defaultCh; |
| 572 | reply->nFontProps = pFont->info.nprops; |
| 573 | reply->drawDirection = pFont->info.drawDirection; |
| 574 | reply->minByte1 = pFont->info.firstRow; |
| 575 | reply->maxByte1 = pFont->info.lastRow; |
| 576 | reply->allCharsExist = pFont->info.allExist; |
| 577 | reply->fontAscent = pFont->info.fontAscent; |
| 578 | reply->fontDescent = pFont->info.fontDescent; |
| 579 | reply->nCharInfos = nCharInfos; |
| 580 | reply->nUniqCharInfos = nUniqCharInfos; |
| 581 | reply->shmid = shmid; |
| 582 | reply->shmsegoffset = 0; |
| 583 | if (client->swapped) { |
| 584 | swaps(&reply->sequenceNumber); |
| 585 | swapl(&reply->length); |
| 586 | swapCharInfo(&reply->minBounds); |
| 587 | swapCharInfo(&reply->maxBounds); |
| 588 | swaps(&reply->minCharOrByte2); |
| 589 | swaps(&reply->maxCharOrByte2); |
| 590 | swaps(&reply->defaultChar); |
| 591 | swaps(&reply->nFontProps); |
| 592 | swaps(&reply->fontAscent); |
| 593 | swaps(&reply->fontDescent); |
| 594 | swapl(&reply->nCharInfos); |
| 595 | swapl(&reply->nUniqCharInfos); |
| 596 | swapl(&reply->shmid); |
| 597 | swapl(&reply->shmsegoffset); |
| 598 | } |
| 599 | p = (char *) &reply[1]; |
| 600 | { |
| 601 | FontPropPtr pFP; |
| 602 | xFontProp *prFP; |
| 603 | int i; |
| 604 | |
| 605 | for (i = 0, pFP = pFont->info.props, prFP = (xFontProp *) p; |
| 606 | i < nfontprops; i++, pFP++, prFP++) { |
| 607 | prFP->name = pFP->name; |
| 608 | prFP->value = pFP->value; |
| 609 | if (client->swapped) { |
| 610 | swapl(&prFP->name); |
| 611 | swapl(&prFP->value); |
| 612 | } |
| 613 | } |
| 614 | p = (char *) prFP; |
| 615 | } |
| 616 | if (nCharInfos > 0 && shmid == -1) { |
| 617 | xCharInfo *pci; |
| 618 | CARD16 *ps; |
| 619 | int i, j; |
| 620 | |
| 621 | pci = (xCharInfo *) p; |
| 622 | for (i = 0; i < nUniqCharInfos; i++, pci++) { |
| 623 | *pci = pCI[pUniqIndex2Index[i]]; |
| 624 | if (client->swapped) |
| 625 | swapCharInfo(pci); |
| 626 | } |
| 627 | ps = (CARD16 *) pci; |
| 628 | for (j = 0; j < nCharInfos; j++, ps++) { |
| 629 | *ps = pIndex2UniqIndex[j]; |
| 630 | if (client->swapped) { |
| 631 | swaps(ps); |
| 632 | } |
| 633 | } |
| 634 | } |
| 635 | WriteToClient(client, rlength, reply); |
| 636 | free(reply); |
| 637 | if (nCharInfos > 0) { |
| 638 | if (shmid == -1) |
| 639 | free(pIndex2UniqIndex); |
| 640 | if (!pDesc) |
| 641 | free(pCI); |
| 642 | } |
| 643 | return Success; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | static int |
| 648 | ProcXF86BigfontDispatch(ClientPtr client) |
| 649 | { |
| 650 | REQUEST(xReq); |
| 651 | |
| 652 | switch (stuff->data) { |
| 653 | case X_XF86BigfontQueryVersion: |
| 654 | return ProcXF86BigfontQueryVersion(client); |
| 655 | case X_XF86BigfontQueryFont: |
| 656 | return ProcXF86BigfontQueryFont(client); |
| 657 | default: |
| 658 | return BadRequest; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | static int |
| 663 | SProcXF86BigfontQueryVersion(ClientPtr client) |
| 664 | { |
| 665 | REQUEST(xXF86BigfontQueryVersionReq); |
| 666 | |
| 667 | swaps(&stuff->length); |
| 668 | return ProcXF86BigfontQueryVersion(client); |
| 669 | } |
| 670 | |
| 671 | static int |
| 672 | SProcXF86BigfontQueryFont(ClientPtr client) |
| 673 | { |
| 674 | REQUEST(xXF86BigfontQueryFontReq); |
| 675 | |
| 676 | swaps(&stuff->length); |
| 677 | REQUEST_SIZE_MATCH(xXF86BigfontQueryFontReq); |
| 678 | swapl(&stuff->id); |
| 679 | return ProcXF86BigfontQueryFont(client); |
| 680 | } |
| 681 | |
| 682 | static int |
| 683 | SProcXF86BigfontDispatch(ClientPtr client) |
| 684 | { |
| 685 | REQUEST(xReq); |
| 686 | |
| 687 | switch (stuff->data) { |
| 688 | case X_XF86BigfontQueryVersion: |
| 689 | return SProcXF86BigfontQueryVersion(client); |
| 690 | case X_XF86BigfontQueryFont: |
| 691 | return SProcXF86BigfontQueryFont(client); |
| 692 | default: |
| 693 | return BadRequest; |
| 694 | } |
| 695 | } |
| 696 | |
| 697 | void |
| 698 | XFree86BigfontExtensionInit(void) |
| 699 | { |
| 700 | if (AddExtension(XF86BIGFONTNAME, |
| 701 | XF86BigfontNumberEvents, |
| 702 | XF86BigfontNumberErrors, |
| 703 | ProcXF86BigfontDispatch, |
| 704 | SProcXF86BigfontDispatch, |
| 705 | XF86BigfontResetProc, StandardMinorOpcode)) { |
| 706 | #ifdef HAS_SHM |
| 707 | #ifdef MUST_CHECK_FOR_SHM_SYSCALL |
| 708 | /* |
| 709 | * Note: Local-clients will not be optimized without shared memory |
| 710 | * support. Remote-client optimization does not depend on shared |
| 711 | * memory support. Thus, the extension is still registered even |
| 712 | * when shared memory support is not functional. |
| 713 | */ |
| 714 | if (!CheckForShmSyscall()) { |
| 715 | ErrorF(XF86BIGFONTNAME |
| 716 | " extension local-client optimization disabled due to lack of shared memory support in the kernel\n"); |
| 717 | return; |
| 718 | } |
| 719 | #endif |
| 720 | |
| 721 | srand((unsigned int) time(NULL)); |
| 722 | signature = ((unsigned int) (65536.0 / (RAND_MAX + 1.0) * rand()) << 16) |
| 723 | + (unsigned int) (65536.0 / (RAND_MAX + 1.0) * rand()); |
| 724 | /* fprintf(stderr, "signature = 0x%08X\n", signature); */ |
| 725 | |
| 726 | FontShmdescIndex = AllocateFontPrivateIndex(); |
| 727 | |
| 728 | #if !defined(CSRG_BASED) && !defined(__CYGWIN__) |
| 729 | pagesize = SHMLBA; |
| 730 | #else |
| 731 | #ifdef _SC_PAGESIZE |
| 732 | pagesize = sysconf(_SC_PAGESIZE); |
| 733 | #else |
| 734 | pagesize = getpagesize(); |
| 735 | #endif |
| 736 | #endif |
| 737 | #endif |
| 738 | } |
| 739 | } |