diff options
Diffstat (limited to 'fontconfig/src/fcstat.c')
| -rw-r--r-- | fontconfig/src/fcstat.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/fontconfig/src/fcstat.c b/fontconfig/src/fcstat.c new file mode 100644 index 000000000..c2d9fe9ee --- /dev/null +++ b/fontconfig/src/fcstat.c @@ -0,0 +1,308 @@ +/* + * 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. + */ +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#include "fcint.h" +#include "fcarch.h" +#include <dirent.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#ifdef HAVE_SYS_VFS_H +#include <sys/vfs.h> +#endif +#ifdef HAVE_SYS_STATFS_H +#include <sys/statfs.h> +#endif +#ifdef HAVE_SYS_PARAM_H +#include <sys/param.h> +#endif +#ifdef HAVE_SYS_MOUNT_H +#include <sys/mount.h> +#endif + +#ifdef _WIN32 + +#include <windows.h> + +#ifdef __GNUC__ +typedef long long INT64; +#define EPOCH_OFFSET 11644473600ll +#else +#define EPOCH_OFFSET 11644473600i64 +typedef __int64 INT64; +#endif + +/* Workaround for problems in the stat() in the Microsoft C library: + * + * 1) stat() uses FindFirstFile() to get the file + * attributes. Unfortunately this API doesn't return correct values + * for modification time of a directory until some time after a file + * or subdirectory has been added to the directory. (This causes + * run-test.sh to fail, for instance.) GetFileAttributesEx() is + * better, it returns the updated timestamp right away. + * + * 2) stat() does some strange things related to backward + * compatibility with the local time timestamps on FAT volumes and + * daylight saving time. This causes problems after the switches + * to/from daylight saving time. See + * http://bugzilla.gnome.org/show_bug.cgi?id=154968 , especially + * comment #30, and http://www.codeproject.com/datetime/dstbugs.asp . + * We don't need any of that, FAT and Win9x are as good as dead. So + * just use the UTC timestamps from NTFS, converted to the Unix epoch. + */ + +int +FcStat (const FcChar8 *file, struct stat *statb) +{ + WIN32_FILE_ATTRIBUTE_DATA wfad; + char full_path_name[MAX_PATH]; + char *basename; + DWORD rc; + + if (!GetFileAttributesEx (file, GetFileExInfoStandard, &wfad)) + return -1; + + statb->st_dev = 0; + + /* Calculate a pseudo inode number as a hash of the full path name. + * Call GetLongPathName() to get the spelling of the path name as it + * is on disk. + */ + rc = GetFullPathName (file, sizeof (full_path_name), full_path_name, &basename); + if (rc == 0 || rc > sizeof (full_path_name)) + return -1; + + rc = GetLongPathName (full_path_name, full_path_name, sizeof (full_path_name)); + statb->st_ino = FcStringHash (full_path_name); + + statb->st_mode = _S_IREAD | _S_IWRITE; + statb->st_mode |= (statb->st_mode >> 3) | (statb->st_mode >> 6); + + if (wfad.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) + statb->st_mode |= _S_IFDIR; + else + statb->st_mode |= _S_IFREG; + + statb->st_nlink = 1; + statb->st_uid = statb->st_gid = 0; + statb->st_rdev = 0; + + if (wfad.nFileSizeHigh > 0) + return -1; + statb->st_size = wfad.nFileSizeLow; + + statb->st_atime = (*(INT64 *)&wfad.ftLastAccessTime)/10000000 - EPOCH_OFFSET; + statb->st_mtime = (*(INT64 *)&wfad.ftLastWriteTime)/10000000 - EPOCH_OFFSET; + statb->st_ctime = statb->st_mtime; + + return 0; +} + +#else + +int +FcStat (const FcChar8 *file, struct stat *statb) +{ + return stat ((char *) file, statb); +} + +#endif + +/* Adler-32 checksum implementation */ +struct Adler32 { + int a; + int b; +}; + +static void +Adler32Init (struct Adler32 *ctx) +{ + ctx->a = 1; + ctx->b = 0; +} + +static void +Adler32Update (struct Adler32 *ctx, const char *data, int data_len) +{ + while (data_len--) + { + ctx->a = (ctx->a + *data++) % 65521; + ctx->b = (ctx->b + ctx->a) % 65521; + } +} + +static int +Adler32Finish (struct Adler32 *ctx) +{ + return ctx->a + (ctx->b << 16); +} + +/* dirent.d_type can be relied upon on FAT filesystem */ +static FcBool +FcDirChecksumScandirFilter(const struct dirent *entry) +{ + return entry->d_type != DT_DIR; +} + +static int +FcDirChecksumScandirSorter(const struct dirent **lhs, const struct dirent **rhs) +{ + return strcmp((*lhs)->d_name, (*rhs)->d_name); +} + +static int +FcDirChecksum (const FcChar8 *dir, time_t *checksum) +{ + struct Adler32 ctx; + struct dirent **files; + int n; + + Adler32Init (&ctx); + + n = scandir ((const char *)dir, &files, + &FcDirChecksumScandirFilter, + &FcDirChecksumScandirSorter); + if (n == -1) + return -1; + + while (n--) + { + Adler32Update (&ctx, files[n]->d_name, strlen(files[n]->d_name) + 1); + Adler32Update (&ctx, (char *)&files[n]->d_type, sizeof(files[n]->d_type)); + free(files[n]); + } + free(files); + + *checksum = Adler32Finish (&ctx); + return 0; +} + +int +FcStatChecksum (const FcChar8 *file, struct stat *statb) +{ + if (FcStat (file, statb) == -1) + return -1; + + if (FcIsFsMtimeBroken (file)) + { + if (FcDirChecksum (file, &statb->st_mtime) == -1) + return -1; + } + + return 0; +} + +static int +FcFStatFs (int fd, FcStatFS *statb) +{ + const char *p = NULL; + int ret; + FcBool flag = FcFalse; + + memset (statb, 0, sizeof (FcStatFS)); + +#if defined(HAVE_FSTATVFS) && (defined(HAVE_STRUCT_STATVFS_F_BASETYPE) || defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME)) + struct statvfs buf; + + if ((ret = fstatvfs (fd, &buf)) == 0) + { +# if defined(HAVE_STRUCT_STATVFS_F_BASETYPE) + p = buf.f_basetype; +# elif defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME) + p = buf.f_fstypename; +# endif + } +#elif defined(HAVE_FSTATFS) && (defined(HAVE_STRUCT_STATFS_F_FLAGS) || defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) || defined(__linux__)) + struct statfs buf; + + if ((ret = fstatfs (fd, &buf)) == 0) + { +# if defined(HAVE_STRUCT_STATFS_F_FLAGS) && defined(MNT_LOCAL) + statb->is_remote_fs = !(buf.f_flags & MNT_LOCAL); + flag = FcTrue; +# endif +# if defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) + p = buf.f_fstypename; +# elif defined(__linux__) + switch (buf.f_type) + { + case 0x6969: /* nfs */ + statb->is_remote_fs = FcTrue; + break; + case 0x4d44: /* fat */ + statb->is_mtime_broken = FcTrue; + break; + default: + break; + } + + return ret; +# else +# error "BUG: No way to figure out with fstatfs()" +# endif + } +#endif + if (p) + { + if (!flag && strcmp (p, "nfs") == 0) + statb->is_remote_fs = FcTrue; + if (strcmp (p, "msdosfs") == 0 || + strcmp (p, "pcfs") == 0) + statb->is_mtime_broken = FcTrue; + } + + return ret; +} + +FcBool +FcIsFsMmapSafe (int fd) +{ + FcStatFS statb; + + if (FcFStatFs (fd, &statb) < 0) + return FcTrue; + + return !statb.is_remote_fs; +} + +FcBool +FcIsFsMtimeBroken (const FcChar8 *dir) +{ + int fd = open ((const char *) dir, O_RDONLY); + + if (fd != -1) + { + FcStatFS statb; + int ret = FcFStatFs (fd, &statb); + + close (fd); + if (ret < 0) + return FcFalse; + + return statb.is_mtime_broken; + } + + return FcFalse; +} |