diff options
Diffstat (limited to 'src/vfs/cpio')
| -rw-r--r-- | src/vfs/cpio/Makefile.am | 7 | ||||
| -rw-r--r-- | src/vfs/cpio/Makefile.in | 734 | ||||
| -rw-r--r-- | src/vfs/cpio/cpio.c | 906 | ||||
| -rw-r--r-- | src/vfs/cpio/cpio.h | 18 |
4 files changed, 1665 insertions, 0 deletions
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uninstall uninstall-am + +.PRECIOUS: Makefile + + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/src/vfs/cpio/cpio.c b/src/vfs/cpio/cpio.c new file mode 100644 index 0000000..f46766f --- /dev/null +++ b/src/vfs/cpio/cpio.c @@ -0,0 +1,906 @@ +/* + Virtual File System: GNU Tar file system. + + Copyright (C) 2000-2022 + Free Software Foundation, Inc. + + Written by: + Jan Hudec, 2000 + Slava Zanko <slavazanko@gmail.com>, 2013 + + This file is part of the Midnight Commander. + + The Midnight Commander is free software: you can redistribute it + and/or modify it under the terms of the GNU General Public License as + published by the Free Software Foundation, either version 3 of the License, + or (at your option) any later version. + + The Midnight Commander is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** \file + * \brief Source: Virtual File System: GNU Tar file system. + * \author Jan Hudec + * \date 2000 + */ + +#include <config.h> + +#include <errno.h> +#include <sys/types.h> +#include <sys/stat.h> + +#include "lib/global.h" +#include "lib/unixcompat.h" +#include "lib/util.h" +#include "lib/widget.h" /* message() */ + +#include "lib/vfs/vfs.h" +#include "lib/vfs/utilvfs.h" +#include "lib/vfs/xdirentry.h" +#include "lib/vfs/gc.h" /* vfs_rmstamp */ + +#include "cpio.h" + +/*** global variables ****************************************************************************/ + +/*** file scope macro definitions ****************************************************************/ + +#define CPIO_SUPER(super) ((cpio_super_t *) (super)) + +#define CPIO_POS(super) cpio_position +/* If some time reentrancy should be needed change it to */ +/* #define CPIO_POS(super) (super)->u.arch.fd */ + +#define CPIO_SEEK_SET(super, where) mc_lseek (CPIO_SUPER(super)->fd, CPIO_POS(super) = (where), SEEK_SET) +#define CPIO_SEEK_CUR(super, where) mc_lseek (CPIO_SUPER(super)->fd, CPIO_POS(super) += (where), SEEK_SET) + +#define MAGIC_LENGTH (6) /* How many bytes we have to read ahead */ +#define SEEKBACK CPIO_SEEK_CUR(super, ptr - top) +#define RETURN(x) return (CPIO_SUPER(super)->type = (x)) +#define TYPEIS(x) ((CPIO_SUPER(super)->type == CPIO_UNKNOWN) || (CPIO_SUPER(super)->type == (x))) + +#define HEAD_LENGTH (26) + +/*** file scope type declarations ****************************************************************/ + +enum +{ + STATUS_START, + STATUS_OK, + STATUS_TRAIL, + STATUS_FAIL, + STATUS_EOF +}; + +enum +{ + CPIO_UNKNOWN = 0, /* Not determined yet */ + CPIO_BIN, /* Binary format */ + CPIO_BINRE, /* Binary format, reverse endianity */ + CPIO_OLDC, /* Old ASCII format */ + CPIO_NEWC, /* New ASCII format */ + CPIO_CRC /* New ASCII format + CRC */ +}; + +struct old_cpio_header +{ + unsigned short c_magic; + short c_dev; + unsigned short c_ino; + unsigned short c_mode; + unsigned short c_uid; + unsigned short c_gid; + unsigned short c_nlink; + short c_rdev; + unsigned short c_mtimes[2]; + unsigned short c_namesize; + unsigned short c_filesizes[2]; +}; + +struct new_cpio_header +{ + unsigned short c_magic; + unsigned long c_ino; + unsigned long c_mode; + unsigned long c_uid; + unsigned long c_gid; + unsigned long c_nlink; + unsigned long c_mtime; + unsigned long c_filesize; + long c_dev; + long c_devmin; + long c_rdev; + long c_rdevmin; + unsigned long c_namesize; + unsigned long c_chksum; +}; + +typedef struct +{ + unsigned long inumber; + dev_t device; + struct vfs_s_inode *inode; +} defer_inode; + +typedef struct +{ + struct vfs_s_super base; /* base class */ + + int fd; + struct stat st; + int type; /* Type of the archive */ + GSList *deferred; /* List of inodes for which another entries may appear */ +} cpio_super_t; + +/*** file scope variables ************************************************************************/ + +static struct vfs_s_subclass cpio_subclass; +static struct vfs_class *vfs_cpiofs_ops = VFS_CLASS (&cpio_subclass); + +static off_t cpio_position; + +/* --------------------------------------------------------------------------------------------- */ +/*** file scope functions ************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t cpio_find_head (struct vfs_class *me, struct vfs_s_super *super); +static ssize_t cpio_read_bin_head (struct vfs_class *me, struct vfs_s_super *super); +static ssize_t cpio_read_oldc_head (struct vfs_class *me, struct vfs_s_super *super); +static ssize_t cpio_read_crc_head (struct vfs_class *me, struct vfs_s_super *super); +static ssize_t cpio_read (void *fh, char *buffer, size_t count); + +/* --------------------------------------------------------------------------------------------- */ + +static int +cpio_defer_find (const void *a, const void *b) +{ + const defer_inode *a1 = (const defer_inode *) a; + const defer_inode *b1 = (const defer_inode *) b; + + return (a1->inumber == b1->inumber && a1->device == b1->device) ? 0 : 1; +} + +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t +cpio_skip_padding (struct vfs_s_super *super) +{ + switch (CPIO_SUPER (super)->type) + { + case CPIO_BIN: + case CPIO_BINRE: + return CPIO_SEEK_CUR (super, (2 - (CPIO_POS (super) % 2)) % 2); + case CPIO_NEWC: + case CPIO_CRC: + return CPIO_SEEK_CUR (super, (4 - (CPIO_POS (super) % 4)) % 4); + case CPIO_OLDC: + return CPIO_POS (super); + default: + g_assert_not_reached (); + return 42; /* & the compiler is happy :-) */ + } +} + +/* --------------------------------------------------------------------------------------------- */ + +static struct vfs_s_super * +cpio_new_archive (struct vfs_class *me) +{ + cpio_super_t *arch; + + arch = g_new0 (cpio_super_t, 1); + arch->base.me = me; + arch->fd = -1; /* for now */ + arch->type = CPIO_UNKNOWN; + + return VFS_SUPER (arch); +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +cpio_free_archive (struct vfs_class *me, struct vfs_s_super *super) +{ + cpio_super_t *arch = CPIO_SUPER (super); + + (void) me; + + if (arch->fd != -1) + { + mc_close (arch->fd); + arch->fd = -1; + } + + g_clear_slist (&arch->deferred, g_free); +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +cpio_open_cpio_file (struct vfs_class *me, struct vfs_s_super *super, const vfs_path_t * vpath) +{ + int fd, type; + cpio_super_t *arch; + mode_t mode; + struct vfs_s_inode *root; + + fd = mc_open (vpath, O_RDONLY); + if (fd == -1) + { + message (D_ERROR, MSG_ERROR, _("Cannot open cpio archive\n%s"), vfs_path_as_str (vpath)); + return -1; + } + + super->name = g_strdup (vfs_path_as_str (vpath)); + arch = CPIO_SUPER (super); + mc_stat (vpath, &arch->st); + + type = get_compression_type (fd, super->name); + if (type == COMPRESSION_NONE) + mc_lseek (fd, 0, SEEK_SET); + else + { + char *s; + vfs_path_t *tmp_vpath; + + mc_close (fd); + s = g_strconcat (super->name, decompress_extension (type), (char *) NULL); + tmp_vpath = vfs_path_from_str_flags (s, VPF_NO_CANON); + fd = mc_open (tmp_vpath, O_RDONLY); + vfs_path_free (tmp_vpath, TRUE); + if (fd == -1) + { + message (D_ERROR, MSG_ERROR, _("Cannot open cpio archive\n%s"), s); + g_free (s); + MC_PTR_FREE (super->name); + return -1; + } + g_free (s); + } + + arch->fd = fd; + mode = arch->st.st_mode & 07777; + mode |= (mode & 0444) >> 2; /* set eXec where Read is */ + mode |= S_IFDIR; + + root = vfs_s_new_inode (me, super, &arch->st); + root->st.st_mode = mode; + root->data_offset = -1; + root->st.st_nlink++; + root->st.st_dev = VFS_SUBCLASS (me)->rdev++; + + super->root = root; + + CPIO_SEEK_SET (super, 0); + + return fd; +} + +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t +cpio_read_head (struct vfs_class *me, struct vfs_s_super *super) +{ + switch (cpio_find_head (me, super)) + { + case CPIO_UNKNOWN: + return -1; + case CPIO_BIN: + case CPIO_BINRE: + return cpio_read_bin_head (me, super); + case CPIO_OLDC: + return cpio_read_oldc_head (me, super); + case CPIO_NEWC: + case CPIO_CRC: + return cpio_read_crc_head (me, super); + default: + g_assert_not_reached (); + return 42; /* & the compiler is happy :-) */ + } +} + +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t +cpio_find_head (struct vfs_class *me, struct vfs_s_super *super) +{ + cpio_super_t *arch = CPIO_SUPER (super); + char buf[BUF_SMALL * 2]; + ssize_t ptr = 0; + ssize_t top; + ssize_t tmp; + + top = mc_read (arch->fd, buf, sizeof (buf)); + if (top > 0) + CPIO_POS (super) += top; + + while (TRUE) + { + if (ptr + MAGIC_LENGTH >= top) + { + if (top > (ssize_t) (sizeof (buf) / 2)) + { + memmove (buf, buf + top - sizeof (buf) / 2, sizeof (buf) / 2); + ptr -= top - sizeof (buf) / 2; + top = sizeof (buf) / 2; + } + tmp = mc_read (arch->fd, buf, top); + if (tmp == 0 || tmp == -1) + { + message (D_ERROR, MSG_ERROR, _("Premature end of cpio archive\n%s"), super->name); + cpio_free_archive (me, super); + return CPIO_UNKNOWN; + } + top += tmp; + } + if (TYPEIS (CPIO_BIN) && ((*(unsigned short *) (buf + ptr)) == 070707)) + { + SEEKBACK; + RETURN (CPIO_BIN); + } + else if (TYPEIS (CPIO_BINRE) + && ((*(unsigned short *) (buf + ptr)) == GUINT16_SWAP_LE_BE_CONSTANT (070707))) + { + SEEKBACK; + RETURN (CPIO_BINRE); + } + else if (TYPEIS (CPIO_OLDC) && (strncmp (buf + ptr, "070707", 6) == 0)) + { + SEEKBACK; + RETURN (CPIO_OLDC); + } + else if (TYPEIS (CPIO_NEWC) && (strncmp (buf + ptr, "070701", 6) == 0)) + { + SEEKBACK; + RETURN (CPIO_NEWC); + } + else if (TYPEIS (CPIO_CRC) && (strncmp (buf + ptr, "070702", 6) == 0)) + { + SEEKBACK; + RETURN (CPIO_CRC); + }; + ptr++; + } +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +cpio_create_entry (struct vfs_class *me, struct vfs_s_super *super, struct stat *st, char *name) +{ + cpio_super_t *arch = CPIO_SUPER (super); + struct vfs_s_inode *inode = NULL; + struct vfs_s_inode *root = super->root; + struct vfs_s_entry *entry = NULL; + char *tn; + + switch (st->st_mode & S_IFMT) + { /* For case of HP/UX archives */ + case S_IFCHR: + case S_IFBLK: +#ifdef S_IFSOCK + /* cppcheck-suppress syntaxError */ + case S_IFSOCK: +#endif +#ifdef S_IFIFO + /* cppcheck-suppress syntaxError */ + case S_IFIFO: +#endif +#ifdef S_IFNAM + /* cppcheck-suppress syntaxError */ + case S_IFNAM: +#endif +#ifdef HAVE_STRUCT_STAT_ST_RDEV + if ((st->st_size != 0) && (st->st_rdev == 0x0001)) + { + /* FIXME: representation of major/minor differs between */ + /* different operating systems. */ + st->st_rdev = (unsigned) st->st_size; + st->st_size = 0; + } +#endif + break; + default: + break; + } + + if ((st->st_nlink > 1) && ((arch->type == CPIO_NEWC) || (arch->type == CPIO_CRC))) + { /* For case of hardlinked files */ + defer_inode i = { st->st_ino, st->st_dev, NULL }; + GSList *l; + + l = g_slist_find_custom (arch->deferred, &i, cpio_defer_find); + if (l != NULL) + { + inode = ((defer_inode *) l->data)->inode; + if (inode->st.st_size != 0 && st->st_size != 0 && (inode->st.st_size != st->st_size)) + { + message (D_ERROR, MSG_ERROR, + _("Inconsistent hardlinks of\n%s\nin cpio archive\n%s"), + name, super->name); + inode = NULL; + } + else if (inode->st.st_size == 0) + inode->st.st_size = st->st_size; + } + } + + /* remove trailing slashes */ + for (tn = name + strlen (name) - 1; tn >= name && IS_PATH_SEP (*tn); tn--) + *tn = '\0'; + + tn = strrchr (name, PATH_SEP); + if (tn == NULL) + tn = name; + else if (tn == name + 1) + { + /* started with "./" -- directory in the root of archive */ + tn++; + } + else + { + *tn = '\0'; + root = vfs_s_find_inode (me, super, name, LINK_FOLLOW, FL_MKDIR); + *tn = PATH_SEP; + tn++; + } + + entry = VFS_SUBCLASS (me)->find_entry (me, root, tn, LINK_FOLLOW, FL_NONE); /* In case entry is already there */ + + if (entry != NULL) + { + /* This shouldn't happen! (well, it can happen if there is a record for a + file and than a record for a directory it is in; cpio would die with + 'No such file or directory' is such case) */ + + if (!S_ISDIR (entry->ino->st.st_mode)) + { + /* This can be considered archive inconsistency */ + message (D_ERROR, MSG_ERROR, + _("%s contains duplicate entries! Skipping!"), super->name); + } + else + { + entry->ino->st.st_mode = st->st_mode; + entry->ino->st.st_uid = st->st_uid; + entry->ino->st.st_gid = st->st_gid; +#ifdef HAVE_STRUCT_STAT_ST_MTIM + entry->ino->st.st_atim = st->st_atim; + entry->ino->st.st_mtim = st->st_mtim; + entry->ino->st.st_ctim = st->st_ctim; +#else + entry->ino->st.st_atime = st->st_atime; + entry->ino->st.st_mtime = st->st_mtime; + entry->ino->st.st_ctime = st->st_ctime; +#endif + } + + g_free (name); + } + else + { /* !entry */ + /* root == NULL can be in the following case: + * a/b/c -> d + * where 'a/b' is the stale link and therefore root of 'c' cannot be found in the archive + */ + if (root != NULL) + { + if (inode == NULL) + { + inode = vfs_s_new_inode (me, super, st); + if ((st->st_nlink > 0) && ((arch->type == CPIO_NEWC) || (arch->type == CPIO_CRC))) + { + /* For case of hardlinked files */ + defer_inode *i; + + i = g_new (defer_inode, 1); + i->inumber = st->st_ino; + i->device = st->st_dev; + i->inode = inode; + + arch->deferred = g_slist_prepend (arch->deferred, i); + } + } + + if (st->st_size != 0) + inode->data_offset = CPIO_POS (super); + + entry = vfs_s_new_entry (me, tn, inode); + vfs_s_insert_entry (me, root, entry); + } + + g_free (name); + + if (!S_ISLNK (st->st_mode)) + CPIO_SEEK_CUR (super, st->st_size); + else + { + if (inode != NULL) + { + /* FIXME: do we must read from arch->fd in case of inode != NULL only or in any case? */ + + inode->linkname = g_malloc (st->st_size + 1); + + if (mc_read (arch->fd, inode->linkname, st->st_size) < st->st_size) + { + inode->linkname[0] = '\0'; + return STATUS_EOF; + } + + inode->linkname[st->st_size] = '\0'; /* Linkname stored without terminating \0 !!! */ + } + + CPIO_POS (super) += st->st_size; + cpio_skip_padding (super); + } + } /* !entry */ + + return STATUS_OK; +} + +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t +cpio_read_bin_head (struct vfs_class *me, struct vfs_s_super *super) +{ + union + { + struct old_cpio_header buf; + short shorts[HEAD_LENGTH >> 1]; + } u; + + cpio_super_t *arch = CPIO_SUPER (super); + ssize_t len; + char *name; + struct stat st; + + len = mc_read (arch->fd, (char *) &u.buf, HEAD_LENGTH); + if (len < HEAD_LENGTH) + return STATUS_EOF; + CPIO_POS (super) += len; + if (arch->type == CPIO_BINRE) + { + int i; + for (i = 0; i < (HEAD_LENGTH >> 1); i++) + u.shorts[i] = GUINT16_SWAP_LE_BE_CONSTANT (u.shorts[i]); + } + + if (u.buf.c_magic != 070707 || u.buf.c_namesize == 0 || u.buf.c_namesize > MC_MAXPATHLEN) + { + message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"), super->name); + return STATUS_FAIL; + } + name = g_malloc (u.buf.c_namesize); + len = mc_read (arch->fd, name, u.buf.c_namesize); + if (len < u.buf.c_namesize) + { + g_free (name); + return STATUS_EOF; + } + name[u.buf.c_namesize - 1] = '\0'; + CPIO_POS (super) += len; + cpio_skip_padding (super); + + if (!strcmp ("TRAILER!!!", name)) + { /* We got to the last record */ + g_free (name); + return STATUS_TRAIL; + } + + st.st_dev = u.buf.c_dev; + st.st_ino = u.buf.c_ino; + st.st_mode = u.buf.c_mode; + st.st_nlink = u.buf.c_nlink; + st.st_uid = u.buf.c_uid; + st.st_gid = u.buf.c_gid; +#ifdef HAVE_STRUCT_STAT_ST_RDEV + st.st_rdev = u.buf.c_rdev; +#endif + st.st_size = ((off_t) u.buf.c_filesizes[0] << 16) | u.buf.c_filesizes[1]; +#ifdef HAVE_STRUCT_STAT_ST_MTIM + st.st_atim.tv_nsec = st.st_mtim.tv_nsec = st.st_ctim.tv_nsec = 0; +#endif + st.st_atime = st.st_mtime = st.st_ctime = + ((time_t) u.buf.c_mtimes[0] << 16) | u.buf.c_mtimes[1]; + + return cpio_create_entry (me, super, &st, name); +} + +/* --------------------------------------------------------------------------------------------- */ + +#undef HEAD_LENGTH +#define HEAD_LENGTH (76) + +static ssize_t +cpio_read_oldc_head (struct vfs_class *me, struct vfs_s_super *super) +{ + cpio_super_t *arch = CPIO_SUPER (super); + struct new_cpio_header hd; + union + { + struct stat st; + char buf[HEAD_LENGTH + 1]; + } u; + ssize_t len; + char *name; + + if (mc_read (arch->fd, u.buf, HEAD_LENGTH) != HEAD_LENGTH) + return STATUS_EOF; + CPIO_POS (super) += HEAD_LENGTH; + u.buf[HEAD_LENGTH] = 0; + + if (sscanf (u.buf, "070707%6lo%6lo%6lo%6lo%6lo%6lo%6lo%11lo%6lo%11lo", + (unsigned long *) &hd.c_dev, &hd.c_ino, &hd.c_mode, &hd.c_uid, &hd.c_gid, + &hd.c_nlink, (unsigned long *) &hd.c_rdev, &hd.c_mtime, + &hd.c_namesize, &hd.c_filesize) < 10) + { + message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"), super->name); + return STATUS_FAIL; + } + + if (hd.c_namesize == 0 || hd.c_namesize > MC_MAXPATHLEN) + { + message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"), super->name); + return STATUS_FAIL; + } + name = g_malloc (hd.c_namesize); + len = mc_read (arch->fd, name, hd.c_namesize); + if ((len == -1) || ((unsigned long) len < hd.c_namesize)) + { + g_free (name); + return STATUS_EOF; + } + name[hd.c_namesize - 1] = '\0'; + CPIO_POS (super) += len; + cpio_skip_padding (super); + + if (!strcmp ("TRAILER!!!", name)) + { /* We got to the last record */ + g_free (name); + return STATUS_TRAIL; + } + + u.st.st_dev = hd.c_dev; + u.st.st_ino = hd.c_ino; + u.st.st_mode = hd.c_mode; + u.st.st_nlink = hd.c_nlink; + u.st.st_uid = hd.c_uid; + u.st.st_gid = hd.c_gid; +#ifdef HAVE_STRUCT_STAT_ST_RDEV + u.st.st_rdev = hd.c_rdev; +#endif + u.st.st_size = hd.c_filesize; +#ifdef HAVE_STRUCT_STAT_ST_MTIM + u.st.st_atim.tv_nsec = u.st.st_mtim.tv_nsec = u.st.st_ctim.tv_nsec = 0; +#endif + u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime; + + return cpio_create_entry (me, super, &u.st, name); +} + +/* --------------------------------------------------------------------------------------------- */ + +#undef HEAD_LENGTH +#define HEAD_LENGTH (110) + +static ssize_t +cpio_read_crc_head (struct vfs_class *me, struct vfs_s_super *super) +{ + cpio_super_t *arch = CPIO_SUPER (super); + struct new_cpio_header hd; + union + { + struct stat st; + char buf[HEAD_LENGTH + 1]; + } u; + ssize_t len; + char *name; + + if (mc_read (arch->fd, u.buf, HEAD_LENGTH) != HEAD_LENGTH) + return STATUS_EOF; + + CPIO_POS (super) += HEAD_LENGTH; + u.buf[HEAD_LENGTH] = '\0'; + + if (sscanf (u.buf, "%6ho%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx", + &hd.c_magic, &hd.c_ino, &hd.c_mode, &hd.c_uid, &hd.c_gid, + &hd.c_nlink, &hd.c_mtime, &hd.c_filesize, + (unsigned long *) &hd.c_dev, (unsigned long *) &hd.c_devmin, + (unsigned long *) &hd.c_rdev, (unsigned long *) &hd.c_rdevmin, + &hd.c_namesize, &hd.c_chksum) < 14) + { + message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"), super->name); + return STATUS_FAIL; + } + + if ((arch->type == CPIO_NEWC && hd.c_magic != 070701) || + (arch->type == CPIO_CRC && hd.c_magic != 070702)) + return STATUS_FAIL; + + if (hd.c_namesize == 0 || hd.c_namesize > MC_MAXPATHLEN) + { + message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"), super->name); + return STATUS_FAIL; + } + + name = g_malloc (hd.c_namesize); + len = mc_read (arch->fd, name, hd.c_namesize); + + if ((len == -1) || ((unsigned long) len < hd.c_namesize)) + { + g_free (name); + return STATUS_EOF; + } + name[hd.c_namesize - 1] = '\0'; + CPIO_POS (super) += len; + cpio_skip_padding (super); + + if (strcmp ("TRAILER!!!", name) == 0) + { /* We got to the last record */ + g_free (name); + return STATUS_TRAIL; + } + + u.st.st_dev = makedev (hd.c_dev, hd.c_devmin); + u.st.st_ino = hd.c_ino; + u.st.st_mode = hd.c_mode; + u.st.st_nlink = hd.c_nlink; + u.st.st_uid = hd.c_uid; + u.st.st_gid = hd.c_gid; +#ifdef HAVE_STRUCT_STAT_ST_RDEV + u.st.st_rdev = makedev (hd.c_rdev, hd.c_rdevmin); +#endif + u.st.st_size = hd.c_filesize; +#ifdef HAVE_STRUCT_STAT_ST_MTIM + u.st.st_atim.tv_nsec = u.st.st_mtim.tv_nsec = u.st.st_ctim.tv_nsec = 0; +#endif + u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime; + + return cpio_create_entry (me, super, &u.st, name); +} + +/* --------------------------------------------------------------------------------------------- */ +/** Need to CPIO_SEEK_CUR to skip the file at the end of add entry!!!! */ + +static int +cpio_open_archive (struct vfs_s_super *super, const vfs_path_t * vpath, + const vfs_path_element_t * vpath_element) +{ + (void) vpath_element; + + if (cpio_open_cpio_file (vpath_element->class, super, vpath) == -1) + return -1; + + while (TRUE) + { + ssize_t status; + + status = cpio_read_head (vpath_element->class, super); + if (status < 0) + return (-1); + + switch (status) + { + case STATUS_EOF: + { + message (D_ERROR, MSG_ERROR, _("Unexpected end of file\n%s"), + vfs_path_as_str (vpath)); + return 0; + } + case STATUS_OK: + continue; + case STATUS_TRAIL: + break; + default: + break; + } + break; + } + + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ +/** Remaining functions are exactly same as for tarfs (and were in fact just copied) */ + +static void * +cpio_super_check (const vfs_path_t * vpath) +{ + static struct stat sb; + int stat_result; + + stat_result = mc_stat (vpath, &sb); + return (stat_result == 0 ? &sb : NULL); +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +cpio_super_same (const vfs_path_element_t * vpath_element, struct vfs_s_super *parc, + const vfs_path_t * vpath, void *cookie) +{ + struct stat *archive_stat = cookie; /* stat of main archive */ + + (void) vpath_element; + + if (strcmp (parc->name, vfs_path_as_str (vpath))) + return 0; + + /* Has the cached archive been changed on the disk? */ + if (parc != NULL && CPIO_SUPER (parc)->st.st_mtime < archive_stat->st_mtime) + { + /* Yes, reload! */ + vfs_cpiofs_ops->free ((vfsid) parc); + vfs_rmstamp (vfs_cpiofs_ops, (vfsid) parc); + return 2; + } + /* Hasn't been modified, give it a new timeout */ + vfs_stamp (vfs_cpiofs_ops, (vfsid) parc); + return 1; +} + +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t +cpio_read (void *fh, char *buffer, size_t count) +{ + vfs_file_handler_t *file = VFS_FILE_HANDLER (fh); + struct vfs_class *me = VFS_FILE_HANDLER_SUPER (fh)->me; + int fd = CPIO_SUPER (VFS_FILE_HANDLER_SUPER (fh))->fd; + off_t begin = file->ino->data_offset; + ssize_t res; + + if (mc_lseek (fd, begin + file->pos, SEEK_SET) != begin + file->pos) + ERRNOR (EIO, -1); + + count = MIN (count, (size_t) (file->ino->st.st_size - file->pos)); + + res = mc_read (fd, buffer, count); + if (res == -1) + ERRNOR (errno, -1); + + file->pos += res; + return res; +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +cpio_fh_open (struct vfs_class *me, vfs_file_handler_t * fh, int flags, mode_t mode) +{ + (void) fh; + (void) mode; + + if ((flags & O_ACCMODE) != O_RDONLY) + ERRNOR (EROFS, -1); + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ +/*** public functions ****************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +void +vfs_init_cpiofs (void) +{ + /* FIXME: cpiofs used own temp files */ + vfs_init_subclass (&cpio_subclass, "cpiofs", VFSF_READONLY, "ucpio"); + vfs_cpiofs_ops->read = cpio_read; + vfs_cpiofs_ops->setctl = NULL; + cpio_subclass.archive_check = cpio_super_check; + cpio_subclass.archive_same = cpio_super_same; + cpio_subclass.new_archive = cpio_new_archive; + cpio_subclass.open_archive = cpio_open_archive; + cpio_subclass.free_archive = cpio_free_archive; + cpio_subclass.fh_open = cpio_fh_open; + vfs_register_class (vfs_cpiofs_ops); +} + +/* --------------------------------------------------------------------------------------------- */ diff --git a/src/vfs/cpio/cpio.h b/src/vfs/cpio/cpio.h new file mode 100644 index 0000000..a00756a --- /dev/null +++ b/src/vfs/cpio/cpio.h @@ -0,0 +1,18 @@ +#ifndef MC__VFS_CPIO_H +#define MC__VFS_CPIO_H + +/*** typedefs(not structures) and defined constants **********************************************/ + +/*** enums ***************************************************************************************/ + +/*** structures declarations (and typedefs of structures)*****************************************/ + +/*** global variables defined in .c file *********************************************************/ + +/*** declarations of public functions ************************************************************/ + +void vfs_init_cpiofs (void); + +/*** inline functions ****************************************************************************/ + +#endif /* MC__VFS_CPIO_H */ |