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fontconfig/src/fccache.c

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/*
* $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
*
* 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 Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD 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 <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <unistd.h>
#include "fcint.h"
#include <unistd.h>
#define ENDIAN_TEST 0x12345678
#define MACHINE_SIGNATURE_SIZE 9 + 5*20 + 1
static int
FcDirCacheOpen (const FcChar8 * dir);
static char *
FcDirCacheHashName (char * cache_file, int collisions);
static off_t
FcCacheSkipToArch (int fd, const char * arch);
static FcBool
FcCacheCopyOld (int fd, int fd_orig, off_t start);
static void *
FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
static FcBool
FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
static int
FcCacheNextOffset(off_t w);
static char *
FcCacheMachineSignature (void);
static FcBool
FcCacheHaveBank (int bank);
static void
FcCacheAddBankDir (int bank, const char * dir);
struct MD5Context {
FcChar32 buf[4];
FcChar32 bits[2];
unsigned char in[64];
};
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]);
#define FC_DBG_CACHE_REF 1024
static char *
FcCacheReadString (int fd, char *dest, int len)
{
FcChar8 c;
FcBool escape;
int size;
int i;
if (len == 0)
return 0;
size = len;
i = 0;
escape = FcFalse;
while (read (fd, &c, 1) == 1)
{
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;
}
return 0;
}
static void
FcCacheSkipString (int fd)
{
FcChar8 c;
FcBool escape;
escape = FcFalse;
while (read (fd, &c, 1) == 1)
{
if (!escape)
{
switch (c) {
case '"':
c = '\0';
break;
case '\\':
escape = FcTrue;
continue;
}
}
if (c == '\0')
return;
escape = FcFalse;
}
return;
}
static FcBool
FcCacheWriteString (int fd, const char *chars)
{
if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
return FcFalse;
return FcTrue;
}
static void
FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
{
FcStrSetDestroy (d->subdirs);
FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
free (d->name);
FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
free (d);
}
FcGlobalCache *
FcGlobalCacheCreate (void)
{
FcGlobalCache *cache;
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;
}
void
FcGlobalCacheDestroy (FcGlobalCache *cache)
{
FcGlobalCacheDir *d, *next;
for (d = cache->dirs; d; d = next)
{
next = d->next;
FcGlobalCacheDirDestroy (d);
}
FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
free (cache);
}
void
FcGlobalCacheLoad (FcGlobalCache *cache,
FcStrSet *staleDirs,
const FcChar8 *cache_file,
FcConfig *config)
{
char name_buf[FC_MAX_FILE_LEN];
FcGlobalCacheDir *d, *next;
FcFileTime config_time = FcConfigModifiedTime (config);
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;
char subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
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;
if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)))
return;
if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
return;
current_arch_machine_name = FcCacheMachineSignature ();
current_arch_start = FcCacheSkipToArch(cache->fd,
current_arch_machine_name);
if (current_arch_start < 0)
goto bail_and_destroy;
lseek (cache->fd, current_arch_start, SEEK_SET);
if (!FcCacheReadString (cache->fd, candidate_arch_machine_name,
sizeof (candidate_arch_machine_name)))
goto bail_and_destroy;
if (strlen(candidate_arch_machine_name) == 0)
goto bail_and_destroy;
while (1)
{
off_t targ;
if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)) ||
!strlen(name_buf))
break;
/* Directory must be older than the global cache file; also
cache must be newer than the config file. */
if (stat ((char *) name_buf, &dir_stat) < 0 ||
dir_stat.st_mtime > cache_stat.st_mtime ||
(config_time.set && cache_stat.st_mtime < config_time.time))
{
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->subdirs = FcStrSetCreate();
do
{
if (!FcCacheReadString (cache->fd, subdirName,
sizeof (subdirName)) ||
!strlen (subdirName))
break;
FcStrSetAdd (d->subdirs, (FcChar8 *)subdirName);
} while (1);
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);
}
cache->dirs = 0;
close (cache->fd);
cache->fd = -1;
return;
bail_and_destroy:
close (cache->fd);
cache->fd = -1;
if (stat ((char *) cache_file, &cache_stat) == 0)
unlink ((char *)cache_file);
return;
}
FcBool
FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
{
FcGlobalCacheDir *d;
FcBool ret = FcFalse;
if (cache->fd == -1)
return FcFalse;
if (!(dir = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)dir)))
return FcFalse; /* non-existing directory */
for (d = cache->dirs; d; d = d->next)
{
if (strncmp (d->name, dir, strlen(dir)) == 0)
{
lseek (cache->fd, d->offset, SEEK_SET);
if (!FcDirCacheConsume (cache->fd, d->name, set, config))
return FcFalse;
if (strcmp (d->name, dir) == 0)
ret = FcTrue;
}
}
return ret;
}
FcBool
FcGlobalCacheUpdate (FcGlobalCache *cache,
FcStrSet *dirs,
const char *name,
FcFontSet *set,
FcConfig *config)
{
FcGlobalCacheDir *d;
int i;
name = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)name);
for (d = cache->dirs; d; d = d->next)
{
if (strcmp(d->name, name) == 0)
break;
}
if (!d)
{
d = malloc (sizeof (FcGlobalCacheDir));
if (!d)
return FcFalse;
d->next = cache->dirs;
cache->dirs = d;
}
cache->updated = FcTrue;
d->name = (char *)FcStrCopy ((FcChar8 *)name);
d->ent = FcDirCacheProduce (set, &d->metadata);
d->offset = 0;
d->subdirs = FcStrSetCreate();
for (i = 0; i < dirs->num; i++)
FcStrSetAdd (d->subdirs, dirs->strs[i]);
return FcTrue;
}
FcBool
FcGlobalCacheSave (FcGlobalCache *cache,
const FcChar8 *cache_file,
FcConfig *config)
{
int fd, fd_orig, i;
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;
#endif
atomic = FcAtomicCreate (cache_file);
if (!atomic)
return FcFalse;
if (!FcAtomicLock (atomic))
goto bail1;
fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT,
S_IRUSR | S_IWUSR);
if (fd == -1)
goto bail2;
FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY);
current_arch_machine_name = FcCacheMachineSignature ();
if (fd_orig == -1)
current_arch_start = 0;
else
current_arch_start = FcCacheSkipToArch (fd_orig,
current_arch_machine_name);
if (current_arch_start < 0)
{
off_t i = lseek(fd_orig, 0, SEEK_END);
if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
current_arch_start = FcCacheNextOffset (i);
}
if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
goto bail3;
close (fd_orig);
fd_orig = -1;
current_arch_start = lseek(fd, 0, SEEK_CUR);
if (ftruncate (fd, current_arch_start) == -1)
goto bail3;
header = malloc (10 + strlen (current_arch_machine_name));
if (!header)
goto bail3;
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 (truncate_to);
truncate_to += dir->metadata.count;
for (i = 0; i < dir->subdirs->size; i++)
truncate_to += strlen((char *)dir->subdirs->strs[i]) + 1;
truncate_to ++;
}
truncate_to -= current_arch_start;
sprintf (header, "%8x ", (int)truncate_to);
strcat (header, current_arch_machine_name);
if (!FcCacheWriteString (fd, header))
goto bail4;
for (dir = cache->dirs; dir; dir = dir->next)
{
if (dir->name)
{
const char * d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
FcCacheWriteString (fd, d);
for (i = 0; i < dir->subdirs->size; i++)
FcCacheWriteString (fd, (char *)dir->subdirs->strs[i]);
FcCacheWriteString (fd, "");
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);
}
}
FcCacheWriteString (fd, "");
if (close (fd) == -1)
goto bail25;
if (!FcAtomicReplaceOrig (atomic))
goto bail25;
FcAtomicUnlock (atomic);
FcAtomicDestroy (atomic);
cache->updated = FcFalse;
return FcTrue;
bail4:
free (header);
bail3:
if (fd_orig != -1)
close (fd_orig);
close (fd);
bail25:
FcAtomicDeleteNew (atomic);
bail2:
FcAtomicUnlock (atomic);
bail1:
FcAtomicDestroy (atomic);
return FcFalse;
}
/*
* Find the next presumably-mmapable offset after the supplied file
* position.
*/
static int
FcCacheNextOffset(off_t w)
{
static long pagesize = -1;
if (pagesize == -1)
pagesize = sysconf(_SC_PAGESIZE);
if (w % pagesize == 0)
return w;
else
return ((w / pagesize)+1)*pagesize;
}
/* 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)
{
char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
char * candidate_arch;
off_t current_arch_start = 0;
lseek (fd, 0, SEEK_SET);
FcCacheSkipString (fd);
current_arch_start = lseek (fd, 0, SEEK_CUR);
/* skip arches that are not the current arch */
while (1)
{
long bs;
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);
// count = 0 should probably be distinguished from the !bs condition
if (!bs || bs < strlen (candidate_arch_machine_name_count))
return -1;
candidate_arch++; /* skip leading space */
if (strcmp (candidate_arch, arch)==0)
return current_arch_start;
current_arch_start += bs;
}
return -1;
}
/* 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
FcCacheCopyOld (int fd, int fd_orig, off_t start)
{
char * buf = malloc (8192);
char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
long bs;
int c, bytes_skipped;
off_t loc;
if (!buf)
return FcFalse;
loc = 0;
lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
do
{
int b = 8192;
if (loc + b > start)
b = start - loc;
if ((c = read (fd_orig, buf, b)) <= 0)
break;
if (write (fd, buf, c) < 0)
goto bail;
loc += c;
}
while (c > 0);
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;
bs = strtol(candidate_arch_machine_name, 0, 16);
if (bs == 0)
goto done;
bytes_skipped = 0;
do
{
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;
}
while (c > 0);
lseek (fd, start+bytes_skipped, SEEK_SET);
done:
free (buf);
return FcTrue;
bail:
free (buf);
return FcFalse;
}
/* Does not check that the cache has the appropriate arch section. */
/* Also, this can be fooled if the original location has a stale
* cache, and the hashed location has an up-to-date cache. Oh well,
* sucks to be you in that case! */
FcBool
FcDirCacheValid (const FcChar8 *dir)
{
struct stat file_stat, dir_stat;
int fd;
if (stat ((char *) dir, &dir_stat) < 0)
return FcFalse;
fd = FcDirCacheOpen (dir);
if (fd < 0)
goto bail;
if (fstat (fd, &file_stat) < 0)
goto bail;
close (fd);
/*
* 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)
return FcFalse;
return FcTrue;
bail:
close (fd);
return FcFalse;
}
/* Assumes that the cache file in 'dir' exists.
* Checks that the cache has the appropriate arch section. */
FcBool
FcDirCacheHasCurrentArch (const FcChar8 *dir)
{
int fd;
off_t current_arch_start;
char *current_arch_machine_name;
fd = FcDirCacheOpen (dir);
if (fd < 0)
goto bail;
current_arch_machine_name = FcCacheMachineSignature();
current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
close (fd);
if (current_arch_start < 0)
return FcFalse;
return FcTrue;
bail:
return FcFalse;
}
FcBool
FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
{
char *cache_file;
char *cache_hashed = 0;
int fd, collisions;
struct stat cache_stat;
char name_buf[FC_MAX_FILE_LEN];
dir = FcConfigNormalizeFontDir (config, dir);
cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
if (!cache_file)
return FcFalse;
/* First remove normal cache file. */
if (stat ((char *) cache_file, &cache_stat) == 0 &&
unlink ((char *)cache_file) != 0)
goto bail;
/* Next remove any applicable hashed files. */
fd = -1; collisions = 0;
do
{
if (cache_hashed)
FcStrFree ((FcChar8 *)cache_hashed);
cache_hashed = FcDirCacheHashName (cache_file, collisions++);
if (!cache_hashed)
goto bail;
if (fd > 0)
close (fd);
fd = open(cache_hashed, O_RDONLY);
if (fd == -1)
{
FcStrFree ((FcChar8 *)cache_file);
return FcTrue;
}
if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
{
FcStrFree ((FcChar8 *)cache_hashed);
goto bail;
}
} while (strcmp (name_buf, cache_file) != 0);
FcStrFree ((FcChar8 *)cache_file);
close (fd);
if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
unlink ((char *)cache_hashed) != 0)
{
FcStrFree ((FcChar8 *)cache_hashed);
goto bail;
}
FcStrFree ((FcChar8 *)cache_hashed);
return FcTrue;
bail:
FcStrFree ((FcChar8 *)cache_file);
return FcFalse;
}
static int
FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
FcStrList *list, FcFontSet * set)
{
int ret = 0;
FcChar8 *dir;
FcChar8 *file, *base;
FcStrSet *subdirs;
FcStrList *sublist;
struct stat statb;
/*
* Read in the results from 'list'.
*/
while ((dir = FcStrListNext (list)))
{
if (!FcConfigAcceptFilename (config, dir))
continue;
/* 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)
{
fprintf (stderr, "Can't create directory set\n");
ret++;
free (file);
continue;
}
if (access ((char *) dir, X_OK) < 0)
{
switch (errno) {
case ENOENT:
case ENOTDIR:
case EACCES:
break;
default:
fprintf (stderr, "\"%s\": ", dir);
perror ("");
ret++;
}
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, config))
{
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;
}
FcFontSet *
FcCacheRead (FcConfig *config, FcGlobalCache * cache)
{
FcFontSet * s = FcFontSetCreate();
if (!s)
return 0;
if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s))
goto bail;
return s;
bail:
FcFontSetDestroy (s);
return 0;
}
static const char bin2hex[] = { '0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f' };
static char *
FcDirCacheHashName (char * cache_file, int collisions)
{
unsigned char hash[16], hex_hash[33];
char *cache_hashed;
unsigned char uscore = '_';
int cnt, i;
FcChar8 *tmp;
struct MD5Context ctx;
MD5Init (&ctx);
MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
for (i = 0; i < collisions; i++)
MD5Update (&ctx, &uscore, 1);
MD5Final (hash, &ctx);
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[32] = 0;
tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
if (!tmp)
return 0;
cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
free (tmp);
return cache_hashed;
}
/* Opens the hashed name for cache_file.
* This would fail in the unlikely event of a collision and subsequent
* removal of the file which originally caused the collision. */
static int
FcDirCacheOpen (const FcChar8 *dir)
{
FcBool found;
int fd = -1, collisions = 0;
char *cache_file, *cache_hashed;
char name_buf[FC_MAX_FILE_LEN];
struct stat dir_stat;
cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
if (!cache_file)
return -1;
fd = open(cache_file, O_RDONLY);
if (fd != -1)
return fd;
if (stat ((char *)dir, &dir_stat) == -1)
return -1;
found = FcFalse;
do
{
struct stat c;
FcChar8 * name_buf_dir;
cache_hashed = FcDirCacheHashName (cache_file, collisions++);
if (!cache_hashed)
{
FcStrFree ((FcChar8 *)cache_file);
return -1;
}
if (fd > 0)
close (fd);
fd = open(cache_hashed, O_RDONLY);
FcStrFree ((FcChar8 *)cache_hashed);
if (fd == -1)
{
FcStrFree ((FcChar8 *)cache_file);
return -1;
}
if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
goto bail;
name_buf_dir = FcStrDirname ((FcChar8 *)name_buf);
if (stat ((char *)name_buf_dir, &c) == -1)
{
FcStrFree (name_buf_dir);
continue;
}
FcStrFree (name_buf_dir);
found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
} while (!found);
FcStrFree ((FcChar8 *)cache_file);
return fd;
bail:
FcStrFree ((FcChar8 *)cache_file);
close (fd);
return -1;
}
/* read serialized state from the cache file */
FcBool
FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
{
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];
fd = FcDirCacheOpen (dir);
if (fd < 0)
goto bail;
current_arch_machine_name = FcCacheMachineSignature();
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 (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
FcStrSetAdd (dirs, (FcChar8 *)subdirName);
if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
goto bail1;
close(fd);
return FcTrue;
bail1:
close (fd);
bail:
return FcFalse;
}
static FcBool
FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
{
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)
{
pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
lseek (fd, pos, SEEK_SET);
if (config)
FcConfigAddFontDir (config, (FcChar8 *)dir);
return FcTrue;
}
pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
current_dir_block = mmap (0, metadata.count,
PROT_READ, MAP_SHARED, fd, pos);
lseek (fd, pos+metadata.count, SEEK_SET);
if (current_dir_block == MAP_FAILED)
return FcFalse;
FcCacheAddBankDir (metadata.bank, dir);
if (config)
FcConfigAddFontDir (config, (FcChar8 *)dir);
if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
return FcFalse;
return FcTrue;
}
static void *
FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
{
void * current_dir_block, * final_dir_block;
static unsigned int rand_state = 0;
int bank, needed_bytes_no_align;
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();
needed_bytes_no_align = FcFontSetNeededBytes (set);
metadata->count = needed_bytes_no_align +
FcFontSetNeededBytesAlign ();
metadata->magic = FC_CACHE_MAGIC;
metadata->bank = bank;
if (!needed_bytes_no_align) /* not a failure, no fonts to write */
{
/* no, you don't really need to write any bytes at all. */
metadata->count = 0;
return 0;
}
current_dir_block = malloc (metadata->count);
if (!current_dir_block)
goto bail;
// shut up valgrind
memset (current_dir_block, 0, metadata->count);
final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
if ((void *)((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;
}
/* write serialized state to the cache file */
FcBool
FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
{
char *cache_file;
char *cache_hashed;
int fd, fd_orig, i, dirs_count;
FcAtomic *atomic;
FcCache metadata;
off_t current_arch_start = 0, truncate_to;
char name_buf[FC_MAX_FILE_LEN];
int collisions;
char *current_arch_machine_name, * header;
void *current_dir_block = 0;
dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
if (!dir)
return FcFalse;
cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
if (!cache_file)
goto bail;
/* Ensure that we're not trampling a cache for some other dir. */
/* This is slightly different from FcDirCacheOpen, since it
* needs the filename, not the file descriptor. */
fd = -1; collisions = 0;
do
{
cache_hashed = FcDirCacheHashName (cache_file, collisions++);
if (!cache_hashed)
goto bail0;
if (fd > 0)
close (fd);
fd = open(cache_hashed, O_RDONLY);
if (fd == -1)
break;
if(!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
{
close (fd);
break;
}
close (fd);
if (strcmp (name_buf, cache_file) != 0)
continue;
} while (0);
current_dir_block = FcDirCacheProduce (set, &metadata);
if (metadata.count && !current_dir_block)
goto bail1;
if (FcDebug () & FC_DBG_CACHE)
printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
if (!atomic)
goto bail1;
if (!FcAtomicLock (atomic))
{
/* Now try rewriting the original version of the file. */
FcAtomicDestroy (atomic);
atomic = FcAtomicCreate ((FcChar8 *)cache_file);
fd_orig = open (cache_file, O_RDONLY);
if (fd_orig == -1)
fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
if (fd == -1)
goto bail2;
}
/* In all cases, try opening the real location of the cache file first. */
/* (even if that's not atomic.) */
fd_orig = open (cache_file, O_RDONLY);
if (fd_orig == -1)
fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
if (fd == -1)
goto bail3;
FcCacheWriteString (fd, cache_file);
current_arch_machine_name = FcCacheMachineSignature ();
current_arch_start = 0;
if (fd_orig != -1)
current_arch_start =
FcCacheSkipToArch(fd_orig, current_arch_machine_name);
if (current_arch_start < 0)
{
off_t i = lseek(fd_orig, 0, SEEK_END);
if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
current_arch_start = FcCacheNextOffset (i);
}
if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
goto bail4;
if (fd_orig != -1)
close (fd_orig);
current_arch_start = lseek(fd, 0, SEEK_CUR);
if (ftruncate (fd, current_arch_start) == -1)
goto bail4;
/* allocate space for subdir names in this block */
dirs_count = 0;
for (i = 0; i < dirs->size; i++)
dirs_count += strlen((char *)dirs->strs[i]) + 1;
dirs_count ++;
/* now write the address of the next offset */
truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
header = malloc (10 + strlen (current_arch_machine_name));
if (!header)
goto bail4;
sprintf (header, "%8x ", (int)truncate_to);
strcat (header, current_arch_machine_name);
if (!FcCacheWriteString (fd, header))
goto bail5;
for (i = 0; i < dirs->size; i++)
FcCacheWriteString (fd, (char *)dirs->strs[i]);
FcCacheWriteString (fd, "");
write (fd, &metadata, sizeof(FcCache));
if (metadata.count)
{
lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_END)), SEEK_SET);
write (fd, current_dir_block, metadata.count);
free (current_dir_block);
}
/* this actually serves to pad out the cache file, if needed */
if (ftruncate (fd, current_arch_start + truncate_to) == -1)
goto bail5;
free (header);
close(fd);
if (!FcAtomicReplaceOrig(atomic))
goto bail5;
FcStrFree ((FcChar8 *)cache_hashed);
FcStrFree ((FcChar8 *)cache_file);
FcAtomicUnlock (atomic);
FcAtomicDestroy (atomic);
return FcTrue;
bail5:
free (header);
bail4:
close (fd);
bail3:
FcAtomicUnlock (atomic);
bail2:
FcAtomicDestroy (atomic);
bail1:
FcStrFree ((FcChar8 *)cache_hashed);
bail0:
unlink ((char *)cache_file);
FcStrFree ((FcChar8 *)cache_file);
if (current_dir_block)
free (current_dir_block);
bail:
return FcFalse;
}
static char *
FcCacheMachineSignature ()
{
static char buf[MACHINE_SIGNATURE_SIZE];
int32_t 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 %4x\n",
m[0], m[1], m[2], m[3],
(unsigned int)sizeof (char),
(unsigned int)sizeof (char *),
(unsigned int)sizeof (int),
(unsigned int)sizeof (FcPattern),
(unsigned int)sizeof (FcPatternEltPtr),
(unsigned int)sizeof (struct _FcPatternElt *),
(unsigned int)sizeof (FcPatternElt),
(unsigned int)sizeof (FcObjectPtr),
(unsigned int)sizeof (FcValueListPtr),
(unsigned int)sizeof (FcValue),
(unsigned int)sizeof (FcValueBinding),
(unsigned int)sizeof (struct _FcValueList *),
(unsigned int)sizeof (FcCharSet),
(unsigned int)sizeof (FcCharLeaf **),
(unsigned int)sizeof (FcChar16 *),
(unsigned int)sizeof (FcChar16),
(unsigned int)sizeof (FcCharLeaf),
(unsigned int)sizeof (FcChar32),
(unsigned int)sizeof (FcCache),
(unsigned int)sysconf(_SC_PAGESIZE));
return buf;
}
static int banks_ptr = 0, banks_alloc = 0;
int * _fcBankId = 0, * _fcBankIdx = 0;
static const char ** bankDirs = 0;
static FcBool
FcCacheHaveBank (int bank)
{
int i;
if (bank < FC_BANK_FIRST)
return FcTrue;
for (i = 0; i < banks_ptr; i++)
if (_fcBankId[i] == bank)
return FcTrue;
return FcFalse;
}
int
FcCacheBankToIndexMTF (int bank)
{
int i, j;
for (i = 0; i < banks_ptr; i++)
if (_fcBankId[_fcBankIdx[i]] == bank)
{
int t = _fcBankIdx[i];
for (j = i; j > 0; j--)
_fcBankIdx[j] = _fcBankIdx[j-1];
_fcBankIdx[0] = t;
return t;
}
if (banks_ptr >= banks_alloc)
{
int * b, * bidx;
const char ** bds;
b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
if (!b)
return -1;
_fcBankId = b;
bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
if (!bidx)
return -1;
_fcBankIdx = bidx;
bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
if (!bds)
return -1;
bankDirs = bds;
banks_alloc += 4;
}
i = banks_ptr++;
_fcBankId[i] = bank;
_fcBankIdx[i] = i;
return i;
}
static void
FcCacheAddBankDir (int bank, const char * dir)
{
int bi = FcCacheBankToIndexMTF (bank);
if (bi < 0)
return;
bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
}
const char *
FcCacheFindBankDir (int bank)
{
int bi = FcCacheBankToIndex (bank);
return bankDirs[bi];
}
/*
* 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, 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<<s | 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;
}
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