X-Git-Url: https://git.wh0rd.org/?a=blobdiff_plain;f=src%2Ffccache.c;h=af2c68fa88ebcd3348db24f9b270fc985edd7c5a;hb=bc5e487f2a1ad9946aa5c6e19cd75794fc38d530;hp=1f530652f348a0d204d61c95458bdd3cbbf6d641;hpb=8245771d5a42dac36024411a0da047b9a7dc42c6;p=fontconfig.git diff --git a/src/fccache.c b/src/fccache.c index 1f53065..af2c68f 100644 --- a/src/fccache.c +++ b/src/fccache.c @@ -1,6 +1,4 @@ /* - * $RCSId: xc/lib/fontconfig/src/fccache.c,v 1.12 2002/08/22 07:36:44 keithp Exp $ - * * Copyright © 2000 Keith Packard * Copyright © 2005 Patrick Lam * @@ -23,868 +21,800 @@ * PERFORMANCE OF THIS SOFTWARE. */ +#include "fcint.h" +#include "../fc-arch/fcarch.h" +#include #include #include -#include -#include +#include #include -#include -#include "fcint.h" - -#define ENDIAN_TEST 0x12345678 -#define MACHINE_SIGNATURE_SIZE 9 + 5*19 + 1 - -static off_t -FcCacheSkipToArch (int fd, const char * arch); - -static FcBool -FcCacheMoveDown (int fd, off_t start); +#if defined(HAVE_MMAP) || defined(__CYGWIN__) +# include +# include +#elif defined(_WIN32) +# include +#endif -static void * -FcDirCacheProduce (FcFontSet *set, FcCache * metadata); +#ifndef O_BINARY +#define O_BINARY 0 +#endif -static FcBool -FcDirCacheConsume (int fd, FcFontSet *set); +struct MD5Context { + FcChar32 buf[4]; + FcChar32 bits[2]; + unsigned char in[64]; +}; -static FcBool -FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir); +static void MD5Init(struct MD5Context *ctx); +static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len); +static void MD5Final(unsigned char digest[16], struct MD5Context *ctx); +static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]); -static int -FcCacheNextOffset(off_t w); +#define CACHEBASE_LEN (1 + 32 + 1 + sizeof (FC_ARCHITECTURE) + sizeof (FC_CACHE_SUFFIX)) -static char * -FcCacheMachineSignature (void); +static const char bin2hex[] = { '0', '1', '2', '3', + '4', '5', '6', '7', + '8', '9', 'a', 'b', + 'c', 'd', 'e', 'f' }; -static FcBool -FcCacheHaveBank (int bank); +static FcChar8 * +FcDirCacheBasename (const FcChar8 * dir, FcChar8 cache_base[CACHEBASE_LEN]) +{ + unsigned char hash[16]; + FcChar8 *hex_hash; + int cnt; + struct MD5Context ctx; -#define FC_DBG_CACHE_REF 1024 + MD5Init (&ctx); + MD5Update (&ctx, (unsigned char *)dir, strlen ((char *) dir)); -static char * -FcCacheReadString (int fd, char *dest, int len) -{ - FcChar8 c; - FcBool escape; - int size; - int i; + MD5Final (hash, &ctx); - if (len == 0) - return 0; - - size = len; - i = 0; - escape = FcFalse; - while (read (fd, &c, 1) == 1) + cache_base[0] = '/'; + hex_hash = cache_base + 1; + for (cnt = 0; cnt < 16; ++cnt) { - if (!escape) - { - switch (c) { - case '"': - c = '\0'; - break; - case '\\': - escape = FcTrue; - continue; - } - } - if (i == size) - { - dest[i++] = 0; - return dest; - } - dest[i++] = c; - if (c == '\0') - return dest; - escape = FcFalse; + hex_hash[2*cnt ] = bin2hex[hash[cnt] >> 4]; + hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf]; } - return 0; -} + hex_hash[2*cnt] = 0; + strcat ((char *) cache_base, "-" FC_ARCHITECTURE FC_CACHE_SUFFIX); -static FcBool -FcCacheWriteString (int fd, const char *chars) -{ - if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1) - return FcFalse; - return FcTrue; + return cache_base; } -static void -FcGlobalCacheDirDestroy (FcGlobalCacheDir *d) +FcBool +FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config) { - FcMemFree (FC_MEM_STRING, strlen (d->name)+1); - free (d->name); - FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir)); - free (d); -} + FcChar8 *cache_hashed = NULL; + FcChar8 cache_base[CACHEBASE_LEN]; + FcStrList *list; + FcChar8 *cache_dir; -FcGlobalCache * -FcGlobalCacheCreate (void) -{ - FcGlobalCache *cache; + FcDirCacheBasename (dir, cache_base); - cache = malloc (sizeof (FcGlobalCache)); - if (!cache) - return 0; - FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache)); - cache->dirs = 0; - cache->updated = FcFalse; - cache->fd = -1; - return cache; + list = FcStrListCreate (config->cacheDirs); + if (!list) + return FcFalse; + + while ((cache_dir = FcStrListNext (list))) + { + cache_hashed = FcStrPlus (cache_dir, cache_base); + if (!cache_hashed) + break; + (void) unlink ((char *) cache_hashed); + } + FcStrListDone (list); + /* return FcFalse if something went wrong */ + if (cache_dir) + return FcFalse; + return FcTrue; } -void -FcGlobalCacheDestroy (FcGlobalCache *cache) +static int +FcDirCacheOpenFile (const FcChar8 *cache_file, struct stat *file_stat) { - FcGlobalCacheDir *d, *next; + int fd; - for (d = cache->dirs; d; d = next) + fd = open((char *) cache_file, O_RDONLY | O_BINARY); + if (fd < 0) + return fd; + if (fstat (fd, file_stat) < 0) { - next = d->next; - FcGlobalCacheDirDestroy (d); + close (fd); + return -1; } - FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache)); - free (cache); + return fd; } -void -FcGlobalCacheLoad (FcGlobalCache *cache, - FcStrSet *staleDirs, - const FcChar8 *cache_file) +/* + * 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) (int fd, off_t size, void *closure), + void *closure, FcChar8 **cache_file_ret) { - char name_buf[8192]; - FcGlobalCacheDir *d, *next; - char * current_arch_machine_name; - char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9]; - off_t current_arch_start; - - struct stat cache_stat, dir_stat; - - if (stat ((char *) cache_file, &cache_stat) < 0) - return; - - cache->fd = open ((char *) cache_file, O_RDONLY); - if (cache->fd == -1) - return; - - cache->updated = FcFalse; + int fd = -1; + FcChar8 cache_base[CACHEBASE_LEN]; + FcStrList *list; + FcChar8 *cache_dir; + struct stat file_stat, dir_stat; + FcBool ret = FcFalse; - current_arch_machine_name = FcCacheMachineSignature (); - current_arch_start = FcCacheSkipToArch(cache->fd, - current_arch_machine_name); - if (current_arch_start < 0) - goto bail0; + if (stat ((char *) dir, &dir_stat) < 0) + return FcFalse; - lseek (cache->fd, current_arch_start, SEEK_SET); - FcCacheReadString (cache->fd, candidate_arch_machine_name, - sizeof (candidate_arch_machine_name)); - if (strlen(candidate_arch_machine_name) == 0) - goto bail0; + FcDirCacheBasename (dir, cache_base); - while (1) + list = FcStrListCreate (config->cacheDirs); + if (!list) + return FcFalse; + + while ((cache_dir = FcStrListNext (list))) { - off_t targ; - - FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)); - if (!strlen(name_buf)) + FcChar8 *cache_hashed = FcStrPlus (cache_dir, cache_base); + if (!cache_hashed) break; - - if (stat ((char *) name_buf, &dir_stat) < 0 || - dir_stat.st_mtime > cache_stat.st_mtime) - { - FcCache md; - - FcStrSetAdd (staleDirs, FcStrCopy ((FcChar8 *)name_buf)); - read (cache->fd, &md, sizeof (FcCache)); - lseek (cache->fd, FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count, SEEK_SET); - continue; - } - - d = malloc (sizeof (FcGlobalCacheDir)); - if (!d) - goto bail1; - - d->next = cache->dirs; - cache->dirs = d; - - d->name = (char *)FcStrCopy ((FcChar8 *)name_buf); - d->ent = 0; - d->offset = lseek (cache->fd, 0, SEEK_CUR); - if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache)) - goto bail1; - targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count; - if (lseek (cache->fd, targ, SEEK_SET) != targ) - goto bail1; - } - return; - - bail1: - for (d = cache->dirs; d; d = next) - { - next = d->next; - free (d); + fd = FcDirCacheOpenFile (cache_hashed, &file_stat); + if (fd >= 0) { + if (dir_stat.st_mtime <= file_stat.st_mtime) + { + ret = (*callback) (fd, file_stat.st_size, closure); + if (ret) + { + if (cache_file_ret) + *cache_file_ret = cache_hashed; + else + FcStrFree (cache_hashed); + close (fd); + break; + } + } + close (fd); + } + FcStrFree (cache_hashed); } - cache->dirs = 0; - bail0: - close (cache->fd); - cache->fd = -1; - return; + FcStrListDone (list); + + return ret; } -FcBool -FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config) -{ - FcGlobalCacheDir *d; - FcBool ret = FcFalse; +#define FC_CACHE_MIN_MMAP 1024 - if (cache->fd == -1) - return FcFalse; +/* + * Map a cache file into memory + */ +static FcCache * +FcDirCacheMapFd (int fd, off_t size) +{ + FcCache *cache = NULL; + FcBool allocated = FcFalse; - for (d = cache->dirs; d; d = d->next) + if (size < sizeof (FcCache)) + return NULL; + /* + * For small cache files, just read them into memory + */ + if (size >= FC_CACHE_MIN_MMAP) { - if (strncmp (d->name, dir, strlen(dir)) == 0) +#if defined(HAVE_MMAP) || defined(__CYGWIN__) + cache = mmap (0, size, PROT_READ, MAP_SHARED, fd, 0); +#elif defined(_WIN32) { - lseek (cache->fd, d->offset, SEEK_SET); - if (!FcDirCacheConsume (cache->fd, set)) - return FcFalse; - if (strcmp (d->name, dir) == 0) - ret = FcTrue; + 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, size); + CloseHandle (hFileMap); + } } +#endif } - - return ret; -} - -FcBool -FcGlobalCacheUpdate (FcGlobalCache *cache, - const char *name, - FcFontSet *set) -{ - FcGlobalCacheDir * d; - - if (!set->nfont) - return FcTrue; - - for (d = cache->dirs; d; d = d->next) + if (!cache) { - if (strcmp(d->name, name) == 0) - break; - } + cache = malloc (size); + if (!cache) + return NULL; - if (!d) + if (read (fd, cache, size) != size) + { + free (cache); + return NULL; + } + allocated = FcTrue; + } + if (cache->magic != FC_CACHE_MAGIC_MMAP || + cache->version != FC_CACHE_CONTENT_VERSION || + cache->size != size) { - d = malloc (sizeof (FcGlobalCacheDir)); - if (!d) - return FcFalse; - d->next = cache->dirs; - cache->dirs = d; + if (allocated) + free (cache); + else + { +#if defined(HAVE_MMAP) || defined(__CYGWIN__) + munmap (cache, size); +#elif defined(_WIN32) + UnmapViewOfFile (cache); +#endif + } + return NULL; } - cache->updated = FcTrue; - - d->name = (char *)FcStrCopy ((FcChar8 *)name); - d->ent = FcDirCacheProduce (set, &d->metadata); - d->offset = 0; - return FcTrue; + /* Mark allocated caches so they're freed rather than unmapped */ + if (allocated) + cache->magic = FC_CACHE_MAGIC_ALLOC; + + return cache; } -FcBool -FcGlobalCacheSave (FcGlobalCache *cache, - const FcChar8 *cache_file) +void +FcDirCacheUnload (FcCache *cache) { - int fd; - FcGlobalCacheDir *dir; - FcAtomic *atomic; - off_t current_arch_start = 0, truncate_to; - char * current_arch_machine_name, * header; - - if (!cache->updated) - return FcTrue; - -#if defined (HAVE_GETUID) && defined (HAVE_GETEUID) - /* Set-UID programs can't safely update the cache */ - if (getuid () != geteuid ()) - return FcFalse; + 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 - - atomic = FcAtomicCreate (cache_file); - if (!atomic) - goto bail0; - if (!FcAtomicLock (atomic)) - goto bail1; - fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT, - S_IRUSR | S_IWUSR); - if (fd == -1) - goto bail2; - - current_arch_machine_name = FcCacheMachineSignature (); - current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name); - if (current_arch_start < 0) - current_arch_start = FcCacheNextOffset (lseek(fd, 0, SEEK_END)); - - if (!FcCacheMoveDown(fd, current_arch_start)) - goto bail2; - - current_arch_start = lseek(fd, 0, SEEK_CUR); - if (ftruncate (fd, current_arch_start) == -1) - goto bail2; - - header = malloc (10 + strlen (current_arch_machine_name)); - if (!header) - goto bail1; - - truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11; - for (dir = cache->dirs; dir; dir = dir->next) - { - truncate_to += strlen(dir->name) + 1; - truncate_to += sizeof (FcCache); - truncate_to = FcCacheNextOffset (current_arch_start + truncate_to); - truncate_to += dir->metadata.count; - } - truncate_to -= current_arch_start; - - sprintf (header, "%8x ", (int)truncate_to); - strcat (header, current_arch_machine_name); - if (!FcCacheWriteString (fd, header)) - goto bail1; - - for (dir = cache->dirs; dir; dir = dir->next) - { - if (dir->ent) - { - FcCacheWriteString (fd, dir->name); - write (fd, &dir->metadata, sizeof(FcCache)); - lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_CUR)), SEEK_SET); - write (fd, dir->ent, dir->metadata.count); - free (dir->ent); - } + break; } - FcCacheWriteString (fd, ""); +} - if (close (fd) == -1) - goto bail3; - - if (!FcAtomicReplaceOrig (atomic)) - goto bail3; - - FcAtomicUnlock (atomic); - FcAtomicDestroy (atomic); +static FcBool +FcDirCacheMapHelper (int fd, off_t size, void *closure) +{ + FcCache *cache = FcDirCacheMapFd (fd, size); - cache->updated = FcFalse; + if (!cache) + return FcFalse; + *((FcCache **) closure) = cache; return FcTrue; - -bail3: - FcAtomicDeleteNew (atomic); -bail2: - FcAtomicUnlock (atomic); -bail1: - FcAtomicDestroy (atomic); -bail0: - return FcFalse; } -#define PAGESIZE 8192 -/* - * Find the next presumably-mmapable offset after the supplied file - * position. - */ -static int -FcCacheNextOffset(off_t w) +FcCache * +FcDirCacheLoad (const FcChar8 *dir, FcConfig *config, FcChar8 **cache_file) { - if (w % PAGESIZE == 0) - return w; - else - return ((w / PAGESIZE)+1)*PAGESIZE; + FcCache *cache = NULL; + + if (!FcDirCacheProcess (config, dir, + FcDirCacheMapHelper, + &cache, cache_file)) + return NULL; + return cache; } -/* return the address of the segment for the provided arch, - * or -1 if arch not found */ -static off_t -FcCacheSkipToArch (int fd, const char * arch) +FcCache * +FcDirCacheLoadFile (const FcChar8 *cache_file, struct stat *file_stat) { - char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9]; - char * candidate_arch; - off_t current_arch_start = 0; - - /* skip arches that are not the current arch */ - while (1) - { - long bs; + int fd; + FcCache *cache; - if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start) - return -1; - - if (FcCacheReadString (fd, candidate_arch_machine_name_count, - sizeof (candidate_arch_machine_name_count)) == 0) - return -1; - if (!strlen(candidate_arch_machine_name_count)) - return -1; - bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16); + fd = FcDirCacheOpenFile (cache_file, file_stat); + if (fd < 0) + return NULL; + cache = FcDirCacheMapFd (fd, file_stat->st_size); + close (fd); + return cache; +} - if (!bs || bs < strlen (candidate_arch_machine_name_count)) - return -1; +/* + * Validate a cache file by reading the header and checking + * the magic number and the size field + */ +static FcBool +FcDirCacheValidateHelper (int fd, off_t size, void *closure) +{ + FcBool ret = FcTrue; + FcCache c; + struct stat file_stat; + + 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_CONTENT_VERSION) + ret = FcFalse; + else if (fstat (fd, &file_stat) < 0) + ret = FcFalse; + else if (file_stat.st_size != c.size) + ret = FcFalse; + return ret; +} - candidate_arch++; /* skip leading space */ +static FcBool +FcDirCacheValidConfig (const FcChar8 *dir, FcConfig *config) +{ + return FcDirCacheProcess (config, dir, + FcDirCacheValidateHelper, + NULL, NULL); +} - if (strcmp (candidate_arch, arch)==0) - return current_arch_start; - current_arch_start += bs; - } +FcBool +FcDirCacheValid (const FcChar8 *dir) +{ + FcConfig *config; + + config = FcConfigGetCurrent (); + if (!config) + return FcFalse; - return -1; + return FcDirCacheValidConfig (dir, config); } -/* Cuts out the segment at the file pointer (moves everything else - * down to cover it), and leaves the file pointer at the end of the - * file. */ -static FcBool -FcCacheMoveDown (int fd, off_t start) +/* + * Build a cache structure from the given contents + */ +FcCache * +FcDirCacheBuild (FcFontSet *set, const FcChar8 *dir, FcStrSet *dirs) { - char * buf = malloc (8192); - char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9]; - long bs; - int c, bytes_skipped; + FcSerialize *serialize = FcSerializeCreate (); + FcCache *cache; + int i; + intptr_t cache_offset; + intptr_t dirs_offset; + FcChar8 *dir_serialize; + intptr_t *dirs_serialize; + FcFontSet *set_serialize; + + if (!serialize) + return NULL; + /* + * Space for cache structure + */ + cache_offset = FcSerializeReserve (serialize, sizeof (FcCache)); + /* + * Directory name + */ + if (!FcStrSerializeAlloc (serialize, dir)) + goto bail1; + /* + * Subdirs + */ + dirs_offset = FcSerializeAlloc (serialize, dirs, dirs->num * sizeof (FcChar8 *)); + for (i = 0; i < dirs->num; i++) + if (!FcStrSerializeAlloc (serialize, dirs->strs[i])) + goto bail1; - if (!buf) - return FcFalse; + /* + * 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); - lseek (fd, start, SEEK_SET); - if (FcCacheReadString (fd, candidate_arch_machine_name, - sizeof (candidate_arch_machine_name)) == 0) - goto done; - if (!strlen(candidate_arch_machine_name)) - goto done; + serialize->linear = cache; - bs = strtol(candidate_arch_machine_name, 0, 16); - if (bs == 0) - goto done; + cache->magic = FC_CACHE_MAGIC_ALLOC; + cache->version = FC_CACHE_CONTENT_VERSION; + cache->size = serialize->size; - bytes_skipped = 0; - do + /* + * 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++) { - lseek (fd, start+bs+bytes_skipped, SEEK_SET); - if ((c = read (fd, buf, 8192)) <= 0) - break; - lseek (fd, start+bytes_skipped, SEEK_SET); - if (write (fd, buf, c) < 0) - goto bail; - bytes_skipped += c; + FcChar8 *d_serialize = FcStrSerialize (serialize, dirs->strs[i]); + if (!d_serialize) + goto bail2; + dirs_serialize[i] = FcPtrToOffset (dirs_serialize, d_serialize); } - while (c > 0); - lseek (fd, start+bytes_skipped, SEEK_SET); + + /* + * Serialize font set + */ + set_serialize = FcFontSetSerialize (serialize, set); + if (!set_serialize) + goto bail2; + cache->set = FcPtrToOffset (cache, set_serialize); - done: - free (buf); - return FcTrue; + FcSerializeDestroy (serialize); + + return cache; - bail: - free (buf); - return FcFalse; +bail2: + free (cache); +bail1: + FcSerializeDestroy (serialize); + return NULL; } -FcBool -FcDirCacheValid (const FcChar8 *dir) +static FcBool +FcMakeDirectory (const FcChar8 *dir) { - FcChar8 *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE); - struct stat file_stat, dir_stat; - - if (stat ((char *) dir, &dir_stat) < 0) - { - FcStrFree (cache_file); - return FcFalse; - } - if (stat ((char *) cache_file, &file_stat) < 0) - { - FcStrFree (cache_file); - return FcFalse; - } - FcStrFree (cache_file); - /* - * If the directory has been modified more recently than - * the cache file, the cache is not valid - */ - if (dir_stat.st_mtime - file_stat.st_mtime > 0) - return FcFalse; - return FcTrue; + FcChar8 *parent; + FcBool ret; + + if (strlen ((char *) dir) == 0) + return FcFalse; + + parent = FcStrDirname (dir); + if (!parent) + return FcFalse; + if (access ((char *) parent, W_OK|X_OK) == 0) + ret = mkdir ((char *) dir, 0777) == 0; + else if (access ((char *) parent, F_OK) == -1) + ret = FcMakeDirectory (parent) && (mkdir ((char *) dir, 0777) == 0); + else + ret = FcFalse; + FcStrFree (parent); + return ret; } -static int -FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache, - FcStrList *list, FcFontSet * set) +/* write serialized state to the cache file */ +FcBool +FcDirCacheWrite (FcCache *cache, FcConfig *config) { - int ret = 0; - FcChar8 *dir; - FcChar8 *file, *base; - FcStrSet *subdirs; - FcStrList *sublist; - struct stat statb; + 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; + int magic; + int written; /* - * Read in the results from 'list'. + * Write it to the first directory in the list which is writable */ - while ((dir = FcStrListNext (list))) - { - /* freed below */ - file = (FcChar8 *) malloc (strlen ((char *) dir) + 1 + FC_MAX_FILE_LEN + 1); - if (!file) - return FcFalse; - - strcpy ((char *) file, (char *) dir); - strcat ((char *) file, "/"); - base = file + strlen ((char *) file); - - subdirs = FcStrSetCreate (); - if (!subdirs) + + list = FcStrListCreate (config->cacheDirs); + if (!list) + return FcFalse; + while ((test_dir = FcStrListNext (list))) { + if (access ((char *) test_dir, W_OK|X_OK) == 0) { - fprintf (stderr, "Can't create directory set\n"); - ret++; - free (file); - continue; + cache_dir = test_dir; + break; } - - if (access ((char *) dir, X_OK) < 0) + else { - switch (errno) { - case ENOENT: - case ENOTDIR: - case EACCES: - break; - default: - fprintf (stderr, "\"%s\": ", dir); - perror (""); - ret++; + /* + * If the directory doesn't exist, try to create it + */ + if (access ((char *) test_dir, F_OK) == -1) { + if (FcMakeDirectory (test_dir)) + { + cache_dir = test_dir; + break; + } } - FcStrSetDestroy (subdirs); - free (file); - continue; - } - if (stat ((char *) dir, &statb) == -1) - { - fprintf (stderr, "\"%s\": ", dir); - perror (""); - FcStrSetDestroy (subdirs); - ret++; - free (file); - continue; - } - if (!S_ISDIR (statb.st_mode)) - { - fprintf (stderr, "\"%s\": not a directory, skipping\n", dir); - FcStrSetDestroy (subdirs); - free (file); - continue; - } - if (!FcDirCacheValid (dir) || !FcDirCacheRead (set, subdirs, dir)) - { - if (FcDebug () & FC_DBG_FONTSET) - printf ("cache scan dir %s\n", dir); - - FcDirScanConfig (set, subdirs, cache, - config->blanks, dir, FcFalse, config); } - sublist = FcStrListCreate (subdirs); - FcStrSetDestroy (subdirs); - if (!sublist) - { - fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir); - ret++; - free (file); - continue; - } - ret += FcCacheReadDirs (config, cache, sublist, set); - free (file); } FcStrListDone (list); - return ret; -} + if (!cache_dir) + return FcFalse; -FcFontSet * -FcCacheRead (FcConfig *config, FcGlobalCache * cache) -{ - FcFontSet * s = FcFontSetCreate(); - if (!s) - return 0; + FcDirCacheBasename (dir, cache_base); + cache_hashed = FcStrPlus (cache_dir, cache_base); + if (!cache_hashed) + return FcFalse; - if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s)) - goto bail; + if (FcDebug () & FC_DBG_CACHE) + printf ("FcDirCacheWriteDir dir \"%s\" file \"%s\"\n", + dir, cache_hashed); - return s; + atomic = FcAtomicCreate ((FcChar8 *)cache_hashed); + if (!atomic) + goto bail1; - bail: - FcFontSetDestroy (s); - return 0; -} + if (!FcAtomicLock (atomic)) + goto bail3; -/* read serialized state from the cache file */ -static FcBool -FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir) -{ - char *cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE); - int fd; - char * current_arch_machine_name; - char candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE]; - off_t current_arch_start = 0; - char subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1]; - - if (!cache_file) - goto bail; - - current_arch_machine_name = FcCacheMachineSignature(); - fd = open(cache_file, O_RDONLY); + fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666); if (fd == -1) - goto bail; - - current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name); - if (current_arch_start < 0) - goto bail1; - - lseek (fd, current_arch_start, SEEK_SET); - if (FcCacheReadString (fd, candidate_arch_machine_name, - sizeof (candidate_arch_machine_name)) == 0) - goto bail1; - - while (strlen(FcCacheReadString (fd, subdirName, sizeof (subdirName))) > 0) - FcStrSetAdd (dirs, (FcChar8 *)subdirName); + 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; + } - if (!FcDirCacheConsume (fd, set)) - goto bail1; - close(fd); - free (cache_file); + if (!FcAtomicReplaceOrig(atomic)) + goto bail4; + FcStrFree (cache_hashed); + FcAtomicUnlock (atomic); + FcAtomicDestroy (atomic); return FcTrue; - bail1: + bail5: close (fd); - bail: - free (cache_file); + bail4: + FcAtomicUnlock (atomic); + bail3: + FcAtomicDestroy (atomic); + bail1: + FcStrFree (cache_hashed); return FcFalse; } -static FcBool -FcDirCacheConsume (int fd, FcFontSet *set) -{ - FcCache metadata; - void * current_dir_block; - off_t pos; - - read(fd, &metadata, sizeof(FcCache)); - if (metadata.magic != FC_CACHE_MAGIC) - return FcFalse; - - if (!metadata.count) - return FcTrue; - - pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR)); - current_dir_block = mmap (0, metadata.count, - PROT_READ, MAP_SHARED, fd, pos); - if (current_dir_block == MAP_FAILED) - return FcFalse; - - if (!FcFontSetUnserialize (metadata, set, current_dir_block)) - return FcFalse; - - return FcTrue; -} +/* + * 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. + */ -static void * -FcDirCacheProduce (FcFontSet *set, FcCache *metadata) +#ifndef HIGHFIRST +#define byteReverse(buf, len) /* Nothing */ +#else +/* + * Note: this code is harmless on little-endian machines. + */ +void byteReverse(unsigned char *buf, unsigned longs) { - void * current_dir_block, * final_dir_block; - static unsigned int rand_state = 0; - int bank; - - if (!rand_state) - rand_state = time(0L); - bank = rand_r(&rand_state); - - while (FcCacheHaveBank(bank)) - bank = rand_r(&rand_state); - - memset (metadata, 0, sizeof(FcCache)); - FcFontSetNewBank(); - metadata->count = FcFontSetNeededBytes (set); - metadata->magic = FC_CACHE_MAGIC; - metadata->bank = bank; - - if (!metadata->count) /* not a failure, no fonts to write */ - return 0; - - current_dir_block = malloc (metadata->count); - if (!current_dir_block) - goto bail; - final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block); - - if ((char *)current_dir_block + metadata->count != final_dir_block) - goto bail; - - if (!FcFontSetSerialize (bank, set)) - goto bail; - - return current_dir_block; - - bail: - free (current_dir_block); - return 0; + 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 -/* write serialized state to the cache file */ -FcBool -FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir) +/* + * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious + * initialization constants. + */ +static void MD5Init(struct MD5Context *ctx) { - FcChar8 *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE); - int fd, i; - FcCache metadata; - off_t current_arch_start = 0, truncate_to; - - char * current_arch_machine_name, * header; - void * current_dir_block; + ctx->buf[0] = 0x67452301; + ctx->buf[1] = 0xefcdab89; + ctx->buf[2] = 0x98badcfe; + ctx->buf[3] = 0x10325476; - if (!cache_file) - goto bail; - - current_dir_block = FcDirCacheProduce (set, &metadata); - - if (!metadata.count) - { - unlink ((char *)cache_file); - free (cache_file); - return FcTrue; - } + ctx->bits[0] = 0; + ctx->bits[1] = 0; +} - if (!current_dir_block) - goto bail; +/* + * Update context to reflect the concatenation of another buffer full + * of bytes. + */ +static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len) +{ + FcChar32 t; - if (FcDebug () & FC_DBG_CACHE) - printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file); + /* Update bitcount */ - fd = open((char *)cache_file, O_RDWR | O_CREAT, 0666); - if (fd == -1) - goto bail0; - - current_arch_machine_name = FcCacheMachineSignature (); - current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name); - if (current_arch_start < 0) - current_arch_start = FcCacheNextOffset (lseek(fd, 0, SEEK_END)); - - if (!FcCacheMoveDown(fd, current_arch_start)) - goto bail0; - - current_arch_start = lseek(fd, 0, SEEK_CUR); - if (ftruncate (fd, current_arch_start) == -1) - goto bail0; - - /* now write the address of the next offset */ - truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache)) + metadata.count) - current_arch_start; - header = malloc (10 + strlen (current_arch_machine_name)); - if (!header) - goto bail0; - sprintf (header, "%8x ", (int)truncate_to); - strcat (header, current_arch_machine_name); - if (!FcCacheWriteString (fd, header)) - goto bail1; + 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; - for (i = 0; i < dirs->size; i++) - FcCacheWriteString (fd, (char *)dirs->strs[i]); - FcCacheWriteString (fd, ""); + t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ - write (fd, &metadata, sizeof(FcCache)); - lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_END)), SEEK_SET); - write (fd, current_dir_block, metadata.count); - free (current_dir_block); + /* Handle any leading odd-sized chunks */ - /* this actually serves to pad out the cache file, if needed */ - if (ftruncate (fd, current_arch_start + truncate_to) == -1) - goto bail1; + if (t) { + unsigned char *p = (unsigned char *) ctx->in + t; - close(fd); - return FcTrue; + 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; + } - bail1: - free (header); - bail0: - free (current_dir_block); - bail: - unlink ((char *)cache_file); - free (cache_file); - return FcFalse; -} + /* Handle any remaining bytes of data. */ -static char * -FcCacheMachineSignature () -{ - static char buf[MACHINE_SIGNATURE_SIZE]; - int magic = ENDIAN_TEST; - char * m = (char *)&magic; - - sprintf (buf, "%2x%2x%2x%2x " - "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x " - "%4x %4x %4x %4x %4x %4x %4x\n", - m[0], m[1], m[2], m[3], - sizeof (char), - sizeof (char *), - sizeof (int), - sizeof (FcPattern), - sizeof (FcPatternEltPtr), - sizeof (struct _FcPatternElt *), - sizeof (FcPatternElt), - sizeof (FcObjectPtr), - sizeof (FcValueListPtr), - sizeof (FcValue), - sizeof (FcValueBinding), - sizeof (struct _FcValueList *), - sizeof (FcCharSet), - sizeof (FcCharLeaf **), - sizeof (FcChar16 *), - sizeof (FcChar16), - sizeof (FcCharLeaf), - sizeof (FcChar32), - sizeof (FcCache)); - - return buf; + memcpy(ctx->in, buf, len); } -static int banks_ptr = 0, banks_alloc = 0; -static int * bankId = 0; - -static FcBool -FcCacheHaveBank (int bank) +/* + * 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) { - int i; - - if (bank < FC_BANK_FIRST) - return FcTrue; + 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); - for (i = 0; i < banks_ptr; i++) - if (bankId[i] == bank) - return FcTrue; + /* Append length in bits and transform */ + ((FcChar32 *) ctx->in)[14] = ctx->bits[0]; + ((FcChar32 *) ctx->in)[15] = ctx->bits[1]; - return FcFalse; + 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 */ } -int -FcCacheBankToIndex (int bank) -{ - static int lastBank = FC_BANK_DYNAMIC, lastIndex = -1; - int i; - int * b; - - if (bank == lastBank) - return lastIndex; - for (i = 0; i < banks_ptr; i++) - if (bankId[i] == bank) - return i; +/* The four core functions - F1 is optimized somewhat */ - if (banks_ptr >= banks_alloc) - { - b = realloc (bankId, (banks_alloc + 4) * sizeof(int)); - if (!b) - return -1; +/* #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)) - bankId = b; - banks_alloc += 4; - } +/* 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 ) - i = banks_ptr++; - bankId[i] = bank; - return i; +/* + * 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; }