/* * Copyright © 2000 Keith Packard * Copyright © 2005 Patrick Lam * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that * copyright notice and this permission notice appear in supporting * documentation, and that the name of the author(s) not be used in * advertising or publicity pertaining to distribution of the software without * specific, written prior permission. The authors make no * representations about the suitability of this software for any purpose. It * is provided "as is" without express or implied warranty. * * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ #include "fcint.h" #include "fcarch.h" #include #include #include #include #include #include #include #include #if defined(HAVE_MMAP) || defined(__CYGWIN__) # include # include #endif #if defined(_WIN32) #include #endif #ifndef O_BINARY #define O_BINARY 0 #endif struct MD5Context { FcChar32 buf[4]; FcChar32 bits[2]; unsigned char in[64]; }; static void MD5Init(struct MD5Context *ctx); static void MD5Update(struct MD5Context *ctx, const unsigned char *buf, unsigned len); static void MD5Final(unsigned char digest[16], struct MD5Context *ctx); static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]); #define CACHEBASE_LEN (1 + 32 + 1 + sizeof (FC_ARCHITECTURE) + sizeof (FC_CACHE_SUFFIX)) static FcBool FcCacheIsMmapSafe (int fd) { enum { MMAP_NOT_INITIALIZED = 0, MMAP_USE, MMAP_DONT_USE, MMAP_CHECK_FS, } status; static void *static_status; status = (intptr_t) fc_atomic_ptr_get (&static_status); if (status == MMAP_NOT_INITIALIZED) { const char *env = getenv ("FONTCONFIG_USE_MMAP"); FcBool use; if (env && FcNameBool ((const FcChar8 *) env, &use)) status = use ? MMAP_USE : MMAP_DONT_USE; else status = MMAP_CHECK_FS; (void) fc_atomic_ptr_cmpexch (&static_status, NULL, (void *) status); } if (status == MMAP_CHECK_FS) return FcIsFsMmapSafe (fd); else return status == MMAP_USE; } static const char bin2hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; static FcChar8 * FcDirCacheBasename (const FcChar8 * dir, FcChar8 cache_base[CACHEBASE_LEN]) { unsigned char hash[16]; FcChar8 *hex_hash; int cnt; struct MD5Context ctx; MD5Init (&ctx); MD5Update (&ctx, (const unsigned char *)dir, strlen ((const char *) dir)); MD5Final (hash, &ctx); cache_base[0] = '/'; hex_hash = cache_base + 1; for (cnt = 0; cnt < 16; ++cnt) { hex_hash[2*cnt ] = bin2hex[hash[cnt] >> 4]; hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf]; } hex_hash[2*cnt] = 0; strcat ((char *) cache_base, "-" FC_ARCHITECTURE FC_CACHE_SUFFIX); return cache_base; } FcBool FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config) { FcChar8 *cache_hashed = NULL; FcChar8 cache_base[CACHEBASE_LEN]; FcStrList *list; FcChar8 *cache_dir; const FcChar8 *sysroot = FcConfigGetSysRoot (config); FcDirCacheBasename (dir, cache_base); list = FcStrListCreate (config->cacheDirs); if (!list) return FcFalse; while ((cache_dir = FcStrListNext (list))) { if (sysroot) cache_hashed = FcStrBuildFilename (sysroot, cache_dir, cache_base, NULL); else cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL); if (!cache_hashed) break; (void) unlink ((char *) cache_hashed); FcStrFree (cache_hashed); } FcStrListDone (list); /* return FcFalse if something went wrong */ if (cache_dir) return FcFalse; return FcTrue; } static int FcDirCacheOpenFile (const FcChar8 *cache_file, struct stat *file_stat) { int fd; #ifdef _WIN32 if (FcStat (cache_file, file_stat) < 0) return -1; #endif fd = FcOpen((char *) cache_file, O_RDONLY | O_BINARY); if (fd < 0) return fd; #ifndef _WIN32 if (fstat (fd, file_stat) < 0) { close (fd); return -1; } #endif return fd; } /* * Look for a cache file for the specified dir. Attempt * to use each one we find, stopping when the callback * indicates success */ static FcBool FcDirCacheProcess (FcConfig *config, const FcChar8 *dir, FcBool (*callback) (FcConfig *config, int fd, struct stat *fd_stat, struct stat *dir_stat, void *closure), void *closure, FcChar8 **cache_file_ret) { int fd = -1; FcChar8 cache_base[CACHEBASE_LEN]; FcStrList *list; FcChar8 *cache_dir, *d; struct stat file_stat, dir_stat; FcBool ret = FcFalse; const FcChar8 *sysroot = FcConfigGetSysRoot (config); if (sysroot) d = FcStrBuildFilename (sysroot, dir, NULL); else d = FcStrdup (dir); if (FcStatChecksum (d, &dir_stat) < 0) { FcStrFree (d); return FcFalse; } FcStrFree (d); FcDirCacheBasename (dir, cache_base); list = FcStrListCreate (config->cacheDirs); if (!list) return FcFalse; while ((cache_dir = FcStrListNext (list))) { FcChar8 *cache_hashed; if (sysroot) cache_hashed = FcStrBuildFilename (sysroot, cache_dir, cache_base, NULL); else cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL); if (!cache_hashed) break; fd = FcDirCacheOpenFile (cache_hashed, &file_stat); if (fd >= 0) { ret = (*callback) (config, fd, &file_stat, &dir_stat, closure); close (fd); if (ret) { if (cache_file_ret) *cache_file_ret = cache_hashed; else FcStrFree (cache_hashed); break; } } FcStrFree (cache_hashed); } FcStrListDone (list); return ret; } #define FC_CACHE_MIN_MMAP 1024 /* * Skip list element, make sure the 'next' pointer is the last thing * in the structure, it will be allocated large enough to hold all * of the necessary pointers */ typedef struct _FcCacheSkip FcCacheSkip; struct _FcCacheSkip { FcCache *cache; FcRef ref; intptr_t size; dev_t cache_dev; ino_t cache_ino; time_t cache_mtime; long cache_mtime_nano; FcCacheSkip *next[1]; }; /* * The head of the skip list; pointers for every possible level * in the skip list, plus the largest level in the list */ #define FC_CACHE_MAX_LEVEL 16 /* Protected by cache_lock below */ static FcCacheSkip *fcCacheChains[FC_CACHE_MAX_LEVEL]; static int fcCacheMaxLevel; static FcMutex *cache_lock; static void lock_cache (void) { FcMutex *lock; retry: lock = fc_atomic_ptr_get (&cache_lock); if (!lock) { lock = (FcMutex *) malloc (sizeof (FcMutex)); FcMutexInit (lock); if (!fc_atomic_ptr_cmpexch (&cache_lock, NULL, lock)) { FcMutexFinish (lock); goto retry; } FcMutexLock (lock); /* Initialize random state */ FcRandom (); return; } FcMutexLock (lock); } static void unlock_cache (void) { FcMutexUnlock (cache_lock); } static void free_lock (void) { FcMutex *lock; lock = fc_atomic_ptr_get (&cache_lock); if (lock && fc_atomic_ptr_cmpexch (&cache_lock, lock, NULL)) { FcMutexFinish (lock); free (lock); } } /* * Generate a random level number, distributed * so that each level is 1/4 as likely as the one before * * Note that level numbers run 1 <= level <= MAX_LEVEL */ static int random_level (void) { /* tricky bit -- each bit is '1' 75% of the time */ long int bits = FcRandom () | FcRandom (); int level = 0; while (++level < FC_CACHE_MAX_LEVEL) { if (bits & 1) break; bits >>= 1; } return level; } /* * Insert cache into the list */ static FcBool FcCacheInsert (FcCache *cache, struct stat *cache_stat) { FcCacheSkip **update[FC_CACHE_MAX_LEVEL]; FcCacheSkip *s, **next; int i, level; lock_cache (); /* * Find links along each chain */ next = fcCacheChains; for (i = fcCacheMaxLevel; --i >= 0; ) { for (; (s = next[i]); next = s->next) if (s->cache > cache) break; update[i] = &next[i]; } /* * Create new list element */ level = random_level (); if (level > fcCacheMaxLevel) { level = fcCacheMaxLevel + 1; update[fcCacheMaxLevel] = &fcCacheChains[fcCacheMaxLevel]; fcCacheMaxLevel = level; } s = malloc (sizeof (FcCacheSkip) + (level - 1) * sizeof (FcCacheSkip *)); if (!s) return FcFalse; s->cache = cache; s->size = cache->size; FcRefInit (&s->ref, 1); if (cache_stat) { s->cache_dev = cache_stat->st_dev; s->cache_ino = cache_stat->st_ino; s->cache_mtime = cache_stat->st_mtime; #ifdef HAVE_STRUCT_STAT_ST_MTIM s->cache_mtime_nano = cache_stat->st_mtim.tv_nsec; #else s->cache_mtime_nano = 0; #endif } else { s->cache_dev = 0; s->cache_ino = 0; s->cache_mtime = 0; s->cache_mtime_nano = 0; } /* * Insert into all fcCacheChains */ for (i = 0; i < level; i++) { s->next[i] = *update[i]; *update[i] = s; } unlock_cache (); return FcTrue; } static FcCacheSkip * FcCacheFindByAddrUnlocked (void *object) { int i; FcCacheSkip **next = fcCacheChains; FcCacheSkip *s; if (!object) return NULL; /* * Walk chain pointers one level at a time */ for (i = fcCacheMaxLevel; --i >= 0;) while (next[i] && (char *) object >= ((char *) next[i]->cache + next[i]->size)) next = next[i]->next; /* * Here we are */ s = next[0]; if (s && (char *) object < ((char *) s->cache + s->size)) return s; return NULL; } static FcCacheSkip * FcCacheFindByAddr (void *object) { FcCacheSkip *ret; lock_cache (); ret = FcCacheFindByAddrUnlocked (object); unlock_cache (); return ret; } static void FcCacheRemoveUnlocked (FcCache *cache) { FcCacheSkip **update[FC_CACHE_MAX_LEVEL]; FcCacheSkip *s, **next; int i; /* * Find links along each chain */ next = fcCacheChains; for (i = fcCacheMaxLevel; --i >= 0; ) { for (; (s = next[i]); next = s->next) if (s->cache >= cache) break; update[i] = &next[i]; } s = next[0]; for (i = 0; i < fcCacheMaxLevel && *update[i] == s; i++) *update[i] = s->next[i]; while (fcCacheMaxLevel > 0 && fcCacheChains[fcCacheMaxLevel - 1] == NULL) fcCacheMaxLevel--; free (s); } static FcCache * FcCacheFindByStat (struct stat *cache_stat) { FcCacheSkip *s; lock_cache (); for (s = fcCacheChains[0]; s; s = s->next[0]) if (s->cache_dev == cache_stat->st_dev && s->cache_ino == cache_stat->st_ino && s->cache_mtime == cache_stat->st_mtime) { #ifdef HAVE_STRUCT_STAT_ST_MTIM if (s->cache_mtime != cache_stat->st_mtim.tv_nsec) continue; #endif FcRefInc (&s->ref); unlock_cache (); return s->cache; } unlock_cache (); return NULL; } static void FcDirCacheDisposeUnlocked (FcCache *cache) { FcCacheRemoveUnlocked (cache); switch (cache->magic) { case FC_CACHE_MAGIC_ALLOC: free (cache); break; case FC_CACHE_MAGIC_MMAP: #if defined(HAVE_MMAP) || defined(__CYGWIN__) munmap (cache, cache->size); #elif defined(_WIN32) UnmapViewOfFile (cache); #endif break; } } void FcCacheObjectReference (void *object) { FcCacheSkip *skip = FcCacheFindByAddr (object); if (skip) FcRefInc (&skip->ref); } void FcCacheObjectDereference (void *object) { FcCacheSkip *skip; lock_cache (); skip = FcCacheFindByAddrUnlocked (object); if (skip) { if (FcRefDec (&skip->ref) == 1) FcDirCacheDisposeUnlocked (skip->cache); } unlock_cache (); } void FcCacheFini (void) { int i; for (i = 0; i < FC_CACHE_MAX_LEVEL; i++) assert (fcCacheChains[i] == NULL); assert (fcCacheMaxLevel == 0); free_lock (); } static FcBool FcCacheTimeValid (FcConfig *config, FcCache *cache, struct stat *dir_stat) { struct stat dir_static; FcBool fnano = FcTrue; if (!dir_stat) { const FcChar8 *sysroot = FcConfigGetSysRoot (config); FcChar8 *d; if (sysroot) d = FcStrBuildFilename (sysroot, FcCacheDir (cache), NULL); else d = FcStrdup (FcCacheDir (cache)); if (FcStatChecksum (d, &dir_static) < 0) { FcStrFree (d); return FcFalse; } FcStrFree (d); dir_stat = &dir_static; } #ifdef HAVE_STRUCT_STAT_ST_MTIM fnano = (cache->checksum_nano == dir_stat->st_mtim.tv_nsec); if (FcDebug () & FC_DBG_CACHE) printf ("FcCacheTimeValid dir \"%s\" cache checksum %d.%ld dir checksum %d.%ld\n", FcCacheDir (cache), cache->checksum, (long)cache->checksum_nano, (int) dir_stat->st_mtime, dir_stat->st_mtim.tv_nsec); #else if (FcDebug () & FC_DBG_CACHE) printf ("FcCacheTimeValid dir \"%s\" cache checksum %d dir checksum %d\n", FcCacheDir (cache), cache->checksum, (int) dir_stat->st_mtime); #endif return cache->checksum == (int) dir_stat->st_mtime && fnano; } /* * Map a cache file into memory */ static FcCache * FcDirCacheMapFd (FcConfig *config, int fd, struct stat *fd_stat, struct stat *dir_stat) { FcCache *cache; FcBool allocated = FcFalse; if (fd_stat->st_size < (int) sizeof (FcCache)) return NULL; cache = FcCacheFindByStat (fd_stat); if (cache) { if (FcCacheTimeValid (config, cache, dir_stat)) return cache; FcDirCacheUnload (cache); cache = NULL; } /* * Large cache files are mmap'ed, smaller cache files are read. This * balances the system cost of mmap against per-process memory usage. */ if (FcCacheIsMmapSafe (fd) && fd_stat->st_size >= FC_CACHE_MIN_MMAP) { #if defined(HAVE_MMAP) || defined(__CYGWIN__) cache = mmap (0, fd_stat->st_size, PROT_READ, MAP_SHARED, fd, 0); #if (HAVE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED) posix_fadvise (fd, 0, fd_stat->st_size, POSIX_FADV_WILLNEED); #endif if (cache == MAP_FAILED) cache = NULL; #elif defined(_WIN32) { HANDLE hFileMap; cache = NULL; hFileMap = CreateFileMapping((HANDLE) _get_osfhandle(fd), NULL, PAGE_READONLY, 0, 0, NULL); if (hFileMap != NULL) { cache = MapViewOfFile (hFileMap, FILE_MAP_READ, 0, 0, fd_stat->st_size); CloseHandle (hFileMap); } } #endif } if (!cache) { cache = malloc (fd_stat->st_size); if (!cache) return NULL; if (read (fd, cache, fd_stat->st_size) != fd_stat->st_size) { free (cache); return NULL; } allocated = FcTrue; } if (cache->magic != FC_CACHE_MAGIC_MMAP || cache->version < FC_CACHE_VERSION_NUMBER || cache->size != (intptr_t) fd_stat->st_size || !FcCacheTimeValid (config, cache, dir_stat) || !FcCacheInsert (cache, fd_stat)) { if (allocated) free (cache); else { #if defined(HAVE_MMAP) || defined(__CYGWIN__) munmap (cache, fd_stat->st_size); #elif defined(_WIN32) UnmapViewOfFile (cache); #endif } return NULL; } /* Mark allocated caches so they're freed rather than unmapped */ if (allocated) cache->magic = FC_CACHE_MAGIC_ALLOC; return cache; } void FcDirCacheReference (FcCache *cache, int nref) { FcCacheSkip *skip = FcCacheFindByAddr (cache); if (skip) FcRefAdd (&skip->ref, nref); } void FcDirCacheUnload (FcCache *cache) { FcCacheObjectDereference (cache); } static FcBool FcDirCacheMapHelper (FcConfig *config, int fd, struct stat *fd_stat, struct stat *dir_stat, void *closure) { FcCache *cache = FcDirCacheMapFd (config, fd, fd_stat, dir_stat); if (!cache) return FcFalse; *((FcCache **) closure) = cache; return FcTrue; } FcCache * FcDirCacheLoad (const FcChar8 *dir, FcConfig *config, FcChar8 **cache_file) { FcCache *cache = NULL; if (!FcDirCacheProcess (config, dir, FcDirCacheMapHelper, &cache, cache_file)) return NULL; return cache; } FcCache * FcDirCacheLoadFile (const FcChar8 *cache_file, struct stat *file_stat) { int fd; FcCache *cache; struct stat my_file_stat; if (!file_stat) file_stat = &my_file_stat; fd = FcDirCacheOpenFile (cache_file, file_stat); if (fd < 0) return NULL; cache = FcDirCacheMapFd (FcConfigGetCurrent (), fd, file_stat, NULL); close (fd); return cache; } /* * Validate a cache file by reading the header and checking * the magic number and the size field */ static FcBool FcDirCacheValidateHelper (FcConfig *config, int fd, struct stat *fd_stat, struct stat *dir_stat, void *closure FC_UNUSED) { FcBool ret = FcTrue; FcCache c; if (read (fd, &c, sizeof (FcCache)) != sizeof (FcCache)) ret = FcFalse; else if (c.magic != FC_CACHE_MAGIC_MMAP) ret = FcFalse; else if (c.version < FC_CACHE_VERSION_NUMBER) ret = FcFalse; else if (fd_stat->st_size != c.size) ret = FcFalse; else if (c.checksum != (int) dir_stat->st_mtime) ret = FcFalse; #ifdef HAVE_STRUCT_STAT_ST_MTIM else if (c.checksum_nano != dir_stat->st_mtim.tv_nsec) ret = FcFalse; #endif return ret; } static FcBool FcDirCacheValidConfig (const FcChar8 *dir, FcConfig *config) { return FcDirCacheProcess (config, dir, FcDirCacheValidateHelper, NULL, NULL); } FcBool FcDirCacheValid (const FcChar8 *dir) { FcConfig *config; config = FcConfigGetCurrent (); if (!config) return FcFalse; return FcDirCacheValidConfig (dir, config); } /* * Build a cache structure from the given contents */ FcCache * FcDirCacheBuild (FcFontSet *set, const FcChar8 *dir, struct stat *dir_stat, FcStrSet *dirs) { FcSerialize *serialize = FcSerializeCreate (); FcCache *cache; int i; FcChar8 *dir_serialize; intptr_t *dirs_serialize; FcFontSet *set_serialize; if (!serialize) return NULL; /* * Space for cache structure */ FcSerializeReserve (serialize, sizeof (FcCache)); /* * Directory name */ if (!FcStrSerializeAlloc (serialize, dir)) goto bail1; /* * Subdirs */ FcSerializeAlloc (serialize, dirs, dirs->num * sizeof (FcChar8 *)); for (i = 0; i < dirs->num; i++) if (!FcStrSerializeAlloc (serialize, dirs->strs[i])) goto bail1; /* * Patterns */ if (!FcFontSetSerializeAlloc (serialize, set)) goto bail1; /* Serialize layout complete. Now allocate space and fill it */ cache = malloc (serialize->size); if (!cache) goto bail1; /* shut up valgrind */ memset (cache, 0, serialize->size); serialize->linear = cache; cache->magic = FC_CACHE_MAGIC_ALLOC; cache->version = FC_CACHE_VERSION_NUMBER; cache->size = serialize->size; cache->checksum = (int) dir_stat->st_mtime; #ifdef HAVE_STRUCT_STAT_ST_MTIM cache->checksum_nano = dir_stat->st_mtim.tv_nsec; #endif /* * Serialize directory name */ dir_serialize = FcStrSerialize (serialize, dir); if (!dir_serialize) goto bail2; cache->dir = FcPtrToOffset (cache, dir_serialize); /* * Serialize sub dirs */ dirs_serialize = FcSerializePtr (serialize, dirs); if (!dirs_serialize) goto bail2; cache->dirs = FcPtrToOffset (cache, dirs_serialize); cache->dirs_count = dirs->num; for (i = 0; i < dirs->num; i++) { FcChar8 *d_serialize = FcStrSerialize (serialize, dirs->strs[i]); if (!d_serialize) goto bail2; dirs_serialize[i] = FcPtrToOffset (dirs_serialize, d_serialize); } /* * Serialize font set */ set_serialize = FcFontSetSerialize (serialize, set); if (!set_serialize) goto bail2; cache->set = FcPtrToOffset (cache, set_serialize); FcSerializeDestroy (serialize); FcCacheInsert (cache, NULL); return cache; bail2: free (cache); bail1: FcSerializeDestroy (serialize); return NULL; } FcCache * FcDirCacheRebuild (FcCache *cache, struct stat *dir_stat, FcStrSet *dirs) { FcCache *new; FcFontSet *set = FcFontSetDeserialize (FcCacheSet (cache)); const FcChar8 *dir = FcCacheDir (cache); new = FcDirCacheBuild (set, dir, dir_stat, dirs); FcFontSetDestroy (set); return new; } /* write serialized state to the cache file */ FcBool FcDirCacheWrite (FcCache *cache, FcConfig *config) { FcChar8 *dir = FcCacheDir (cache); FcChar8 cache_base[CACHEBASE_LEN]; FcChar8 *cache_hashed; int fd; FcAtomic *atomic; FcStrList *list; FcChar8 *cache_dir = NULL; FcChar8 *test_dir, *d = NULL; FcCacheSkip *skip; struct stat cache_stat; unsigned int magic; int written; const FcChar8 *sysroot = FcConfigGetSysRoot (config); /* * Write it to the first directory in the list which is writable */ list = FcStrListCreate (config->cacheDirs); if (!list) return FcFalse; while ((test_dir = FcStrListNext (list))) { if (d) FcStrFree (d); if (sysroot) d = FcStrBuildFilename (sysroot, test_dir, NULL); else d = FcStrCopyFilename (test_dir); if (access ((char *) d, W_OK) == 0) { cache_dir = FcStrCopyFilename (d); break; } else { /* * If the directory doesn't exist, try to create it */ if (access ((char *) d, F_OK) == -1) { if (FcMakeDirectory (d)) { cache_dir = FcStrCopyFilename (d); /* Create CACHEDIR.TAG */ FcDirCacheCreateTagFile (d); break; } } /* * Otherwise, try making it writable */ else if (chmod ((char *) d, 0755) == 0) { cache_dir = FcStrCopyFilename (d); /* Try to create CACHEDIR.TAG too */ FcDirCacheCreateTagFile (d); break; } } } if (d) FcStrFree (d); FcStrListDone (list); if (!cache_dir) return FcFalse; FcDirCacheBasename (dir, cache_base); cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL); if (!cache_hashed) return FcFalse; FcStrFree (cache_dir); if (FcDebug () & FC_DBG_CACHE) printf ("FcDirCacheWriteDir dir \"%s\" file \"%s\"\n", dir, cache_hashed); atomic = FcAtomicCreate ((FcChar8 *)cache_hashed); if (!atomic) goto bail1; if (!FcAtomicLock (atomic)) goto bail3; fd = FcOpen((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666); if (fd == -1) goto bail4; /* Temporarily switch magic to MMAP while writing to file */ magic = cache->magic; if (magic != FC_CACHE_MAGIC_MMAP) cache->magic = FC_CACHE_MAGIC_MMAP; /* * Write cache contents to file */ written = write (fd, cache, cache->size); /* Switch magic back */ if (magic != FC_CACHE_MAGIC_MMAP) cache->magic = magic; if (written != cache->size) { perror ("write cache"); goto bail5; } close(fd); if (!FcAtomicReplaceOrig(atomic)) goto bail4; /* If the file is small, update the cache chain entry such that the * new cache file is not read again. If it's large, we don't do that * such that we reload it, using mmap, which is shared across processes. */ if (cache->size < FC_CACHE_MIN_MMAP && FcStat (cache_hashed, &cache_stat)) { lock_cache (); if ((skip = FcCacheFindByAddrUnlocked (cache))) { skip->cache_dev = cache_stat.st_dev; skip->cache_ino = cache_stat.st_ino; skip->cache_mtime = cache_stat.st_mtime; #ifdef HAVE_STRUCT_STAT_ST_MTIM skip->cache_mtime_nano = cache_stat.st_mtim.tv_nsec; #else skip->cache_mtime_nano = 0; #endif } unlock_cache (); } FcStrFree (cache_hashed); FcAtomicUnlock (atomic); FcAtomicDestroy (atomic); return FcTrue; bail5: close (fd); bail4: FcAtomicUnlock (atomic); bail3: FcAtomicDestroy (atomic); bail1: FcStrFree (cache_hashed); return FcFalse; } FcBool FcDirCacheClean (const FcChar8 *cache_dir, FcBool verbose) { DIR *d; struct dirent *ent; FcChar8 *dir; FcBool ret = FcTrue; FcBool remove; FcCache *cache; struct stat target_stat; const FcChar8 *sysroot; /* FIXME: this API needs to support non-current FcConfig */ sysroot = FcConfigGetSysRoot (NULL); if (sysroot) dir = FcStrBuildFilename (sysroot, cache_dir, NULL); else dir = FcStrCopyFilename (cache_dir); if (!dir) { fprintf (stderr, "Fontconfig error: %s: out of memory\n", cache_dir); return FcFalse; } if (access ((char *) dir, W_OK) != 0) { if (verbose || FcDebug () & FC_DBG_CACHE) printf ("%s: not cleaning %s cache directory\n", dir, access ((char *) dir, F_OK) == 0 ? "unwritable" : "non-existent"); goto bail0; } if (verbose || FcDebug () & FC_DBG_CACHE) printf ("%s: cleaning cache directory\n", dir); d = opendir ((char *) dir); if (!d) { perror ((char *) dir); ret = FcFalse; goto bail0; } while ((ent = readdir (d))) { FcChar8 *file_name; const FcChar8 *target_dir; if (ent->d_name[0] == '.') continue; /* skip cache files for different architectures and */ /* files which are not cache files at all */ if (strlen(ent->d_name) != 32 + strlen ("-" FC_ARCHITECTURE FC_CACHE_SUFFIX) || strcmp(ent->d_name + 32, "-" FC_ARCHITECTURE FC_CACHE_SUFFIX)) continue; file_name = FcStrBuildFilename (dir, (FcChar8 *)ent->d_name, NULL); if (!file_name) { fprintf (stderr, "Fontconfig error: %s: allocation failure\n", dir); ret = FcFalse; break; } remove = FcFalse; cache = FcDirCacheLoadFile (file_name, NULL); if (!cache) { if (verbose || FcDebug () & FC_DBG_CACHE) printf ("%s: invalid cache file: %s\n", dir, ent->d_name); remove = FcTrue; } else { FcChar8 *s; target_dir = FcCacheDir (cache); if (sysroot) s = FcStrBuildFilename (sysroot, target_dir, NULL); else s = FcStrdup (target_dir); if (stat ((char *) s, &target_stat) < 0) { if (verbose || FcDebug () & FC_DBG_CACHE) printf ("%s: %s: missing directory: %s \n", dir, ent->d_name, s); remove = FcTrue; } FcDirCacheUnload (cache); FcStrFree (s); } if (remove) { if (unlink ((char *) file_name) < 0) { perror ((char *) file_name); ret = FcFalse; } } FcStrFree (file_name); } closedir (d); bail0: FcStrFree (dir); return ret; } int FcDirCacheLock (const FcChar8 *dir, FcConfig *config) { FcChar8 *cache_hashed = NULL; FcChar8 cache_base[CACHEBASE_LEN]; FcStrList *list; FcChar8 *cache_dir; const FcChar8 *sysroot = FcConfigGetSysRoot (config); int fd = -1; FcDirCacheBasename (dir, cache_base); list = FcStrListCreate (config->cacheDirs); if (!list) return -1; while ((cache_dir = FcStrListNext (list))) { if (sysroot) cache_hashed = FcStrBuildFilename (sysroot, cache_dir, cache_base, NULL); else cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL); if (!cache_hashed) break; fd = FcOpen ((const char *)cache_hashed, O_RDWR); /* No caches in that directory. simply retry with another one */ if (fd != -1) { #if defined(_WIN32) if (_locking (fd, _LK_LOCK, 1) == -1) goto bail; #else struct flock fl; fl.l_type = F_WRLCK; fl.l_whence = SEEK_SET; fl.l_start = 0; fl.l_len = 0; fl.l_pid = getpid (); if (fcntl (fd, F_SETLKW, &fl) == -1) goto bail; #endif break; } } return fd; bail: if (fd != -1) close (fd); return -1; } void FcDirCacheUnlock (int fd) { if (fd != -1) { #if defined(_WIN32) _locking (fd, _LK_UNLCK, 1); #else struct flock fl; fl.l_type = F_UNLCK; fl.l_whence = SEEK_SET; fl.l_start = 0; fl.l_len = 0; fl.l_pid = getpid (); fcntl (fd, F_SETLK, &fl); #endif close (fd); } } /* * Hokey little macro trick to permit the definitions of C functions * with the same name as CPP macros */ #define args1(x) (x) #define args2(x,y) (x,y) const FcChar8 * FcCacheDir args1(const FcCache *c) { return FcCacheDir (c); } FcFontSet * FcCacheCopySet args1(const FcCache *c) { FcFontSet *old = FcCacheSet (c); FcFontSet *new = FcFontSetCreate (); int i; if (!new) return NULL; for (i = 0; i < old->nfont; i++) { FcPattern *font = FcFontSetFont (old, i); FcPatternReference (font); if (!FcFontSetAdd (new, font)) { FcFontSetDestroy (new); return NULL; } } return new; } const FcChar8 * FcCacheSubdir args2(const FcCache *c, int i) { return FcCacheSubdir (c, i); } int FcCacheNumSubdir args1(const FcCache *c) { return c->dirs_count; } int FcCacheNumFont args1(const FcCache *c) { return FcCacheSet(c)->nfont; } /* * This code implements the MD5 message-digest algorithm. * The algorithm is due to Ron Rivest. This code was * written by Colin Plumb in 1993, no copyright is claimed. * This code is in the public domain; do with it what you wish. * * Equivalent code is available from RSA Data Security, Inc. * This code has been tested against that, and is equivalent, * except that you don't need to include two pages of legalese * with every copy. * * To compute the message digest of a chunk of bytes, declare an * MD5Context structure, pass it to MD5Init, call MD5Update as * needed on buffers full of bytes, and then call MD5Final, which * will fill a supplied 16-byte array with the digest. */ #ifndef HIGHFIRST #define byteReverse(buf, len) /* Nothing */ #else /* * Note: this code is harmless on little-endian machines. */ void byteReverse(unsigned char *buf, unsigned longs) { FcChar32 t; do { t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 | ((unsigned) buf[1] << 8 | buf[0]); *(FcChar32 *) buf = t; buf += 4; } while (--longs); } #endif /* * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious * initialization constants. */ static void MD5Init(struct MD5Context *ctx) { ctx->buf[0] = 0x67452301; ctx->buf[1] = 0xefcdab89; ctx->buf[2] = 0x98badcfe; ctx->buf[3] = 0x10325476; ctx->bits[0] = 0; ctx->bits[1] = 0; } /* * Update context to reflect the concatenation of another buffer full * of bytes. */ static void MD5Update(struct MD5Context *ctx, const unsigned char *buf, unsigned len) { FcChar32 t; /* Update bitcount */ t = ctx->bits[0]; if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t) ctx->bits[1]++; /* Carry from low to high */ ctx->bits[1] += len >> 29; t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ /* Handle any leading odd-sized chunks */ if (t) { unsigned char *p = (unsigned char *) ctx->in + t; t = 64 - t; if (len < t) { memcpy(p, buf, len); return; } memcpy(p, buf, t); byteReverse(ctx->in, 16); MD5Transform(ctx->buf, (FcChar32 *) ctx->in); buf += t; len -= t; } /* Process data in 64-byte chunks */ while (len >= 64) { memcpy(ctx->in, buf, 64); byteReverse(ctx->in, 16); MD5Transform(ctx->buf, (FcChar32 *) ctx->in); buf += 64; len -= 64; } /* Handle any remaining bytes of data. */ memcpy(ctx->in, buf, len); } /* * Final wrapup - pad to 64-byte boundary with the bit pattern * 1 0* (64-bit count of bits processed, MSB-first) */ static void MD5Final(unsigned char digest[16], struct MD5Context *ctx) { unsigned count; unsigned char *p; /* Compute number of bytes mod 64 */ count = (ctx->bits[0] >> 3) & 0x3F; /* Set the first char of padding to 0x80. This is safe since there is always at least one byte free */ p = ctx->in + count; *p++ = 0x80; /* Bytes of padding needed to make 64 bytes */ count = 64 - 1 - count; /* Pad out to 56 mod 64 */ if (count < 8) { /* Two lots of padding: Pad the first block to 64 bytes */ memset(p, 0, count); byteReverse(ctx->in, 16); MD5Transform(ctx->buf, (FcChar32 *) ctx->in); /* Now fill the next block with 56 bytes */ memset(ctx->in, 0, 56); } else { /* Pad block to 56 bytes */ memset(p, 0, count - 8); } byteReverse(ctx->in, 14); /* Append length in bits and transform */ ((FcChar32 *) ctx->in)[14] = ctx->bits[0]; ((FcChar32 *) ctx->in)[15] = ctx->bits[1]; MD5Transform(ctx->buf, (FcChar32 *) ctx->in); byteReverse((unsigned char *) ctx->buf, 4); memcpy(digest, ctx->buf, 16); memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */ } /* The four core functions - F1 is optimized somewhat */ /* #define F1(x, y, z) (x & y | ~x & z) */ #define F1(x, y, z) (z ^ (x & (y ^ z))) #define F2(x, y, z) F1(z, x, y) #define F3(x, y, z) (x ^ y ^ z) #define F4(x, y, z) (y ^ (x | ~z)) /* This is the central step in the MD5 algorithm. */ #define MD5STEP(f, w, x, y, z, data, s) \ ( w += f(x, y, z) + data, w = w<>(32-s), w += x ) /* * The core of the MD5 algorithm, this alters an existing MD5 hash to * reflect the addition of 16 longwords of new data. MD5Update blocks * the data and converts bytes into longwords for this routine. */ static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]) { register FcChar32 a, b, c, d; a = buf[0]; b = buf[1]; c = buf[2]; d = buf[3]; MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); buf[0] += a; buf[1] += b; buf[2] += c; buf[3] += d; } FcBool FcDirCacheCreateTagFile (const FcChar8 *cache_dir) { FcChar8 *cache_tag; int fd; FILE *fp; FcAtomic *atomic; static const FcChar8 cache_tag_contents[] = "Signature: 8a477f597d28d172789f06886806bc55\n" "# This file is a cache directory tag created by fontconfig.\n" "# For information about cache directory tags, see:\n" "# http://www.brynosaurus.com/cachedir/\n"; static size_t cache_tag_contents_size = sizeof (cache_tag_contents) - 1; FcBool ret = FcFalse; if (!cache_dir) return FcFalse; if (access ((char *) cache_dir, W_OK) == 0) { /* Create CACHEDIR.TAG */ cache_tag = FcStrBuildFilename (cache_dir, "CACHEDIR.TAG", NULL); if (!cache_tag) return FcFalse; atomic = FcAtomicCreate ((FcChar8 *)cache_tag); if (!atomic) goto bail1; if (!FcAtomicLock (atomic)) goto bail2; fd = FcOpen((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0644); if (fd == -1) goto bail3; fp = fdopen(fd, "wb"); if (fp == NULL) goto bail3; fwrite(cache_tag_contents, cache_tag_contents_size, sizeof (FcChar8), fp); fclose(fp); if (!FcAtomicReplaceOrig(atomic)) goto bail3; ret = FcTrue; bail3: FcAtomicUnlock (atomic); bail2: FcAtomicDestroy (atomic); bail1: FcStrFree (cache_tag); } if (FcDebug () & FC_DBG_CACHE) { if (ret) printf ("Created CACHEDIR.TAG at %s\n", cache_dir); else printf ("Unable to create CACHEDIR.TAG at %s\n", cache_dir); } return ret; } void FcCacheCreateTagFile (const FcConfig *config) { FcChar8 *cache_dir = NULL, *d = NULL; FcStrList *list; const FcChar8 *sysroot = FcConfigGetSysRoot (config); list = FcConfigGetCacheDirs (config); if (!list) return; while ((cache_dir = FcStrListNext (list))) { if (d) FcStrFree (d); if (sysroot) d = FcStrBuildFilename (sysroot, cache_dir, NULL); else d = FcStrCopyFilename (cache_dir); if (FcDirCacheCreateTagFile (d)) break; } if (d) FcStrFree (d); FcStrListDone (list); } #define __fccache__ #include "fcaliastail.h" #undef __fccache__