First cut at RockRidge support.
Large thanks to the easy-to-read and well-documented sys/isofs/cd9660 source code, which provided many of the details I needed for this exercise.
This commit is contained in:
Tim Kientzle
parent
e87e3960b6
commit
8544432b98
@ -70,7 +70,7 @@ __FBSDID("$FreeBSD$");
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*/
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/* Structure of on-disk PVD. */
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struct primary_volume_descriptor {
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struct iso9660_primary_volume_descriptor {
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unsigned char type[1];
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char id[5];
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unsigned char version[1];
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@ -106,7 +106,7 @@ struct primary_volume_descriptor {
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};
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/* Structure of an on-disk directory record. */
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struct directory_record {
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struct iso9660_directory_record {
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unsigned char length[1];
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unsigned char ext_attr_length[1];
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unsigned char extent[8];
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@ -126,15 +126,19 @@ struct directory_record {
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*/
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/* In-memory storage for a directory record. */
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struct dir_rec {
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struct dir_rec *parent;
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struct file_info {
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struct file_info *parent;
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int refcount;
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unsigned char flags;
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uint64_t offset; /* Offset on disk. */
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uint64_t size; /* File size in bytes. */
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time_t mtime; /* File last modified time. */
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time_t atime; /* File last accessed time. */
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time_t ctime; /* File creation time. */
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mode_t mode;
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char name[1]; /* Null-terminated filename. */
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uid_t uid;
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gid_t gid;
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int nlinks;
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char *name; /* Null-terminated filename. */
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};
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@ -149,7 +153,7 @@ struct iso9660 {
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struct archive_string previous_pathname;
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/* TODO: Make this a heap for fast inserts and deletions. */
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struct dir_rec **pending_files;
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struct file_info **pending_files;
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int pending_files_allocated;
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int pending_files_used;
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@ -166,14 +170,18 @@ static int archive_read_format_iso9660_read_data(struct archive *,
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const void **, size_t *, off_t *);
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static int archive_read_format_iso9660_read_header(struct archive *,
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struct archive_entry *);
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static const char *build_pathname(struct archive_string *, struct dir_rec *);
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static void dump_isodirent(FILE *, const struct directory_record *);
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static time_t isodate(const void *);
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static const char *build_pathname(struct archive_string *, struct file_info *);
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static void dump_isodirrec(FILE *, const struct iso9660_directory_record *);
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static time_t isodate17(const void *);
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static time_t isodate7(const void *);
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static int isPVD(struct iso9660 *, const char *);
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static struct dir_rec *next_entry(struct iso9660 *);
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static void release_dirrec(struct iso9660 *, struct dir_rec *);
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static int store_pending(struct iso9660 *, struct dir_rec *parent,
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const struct directory_record *);
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static struct file_info *next_entry(struct iso9660 *);
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static void parse_rockridge(struct iso9660 *iso9660,
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const struct iso9660_directory_record *isodirrec,
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struct file_info *file);
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static void release_file(struct iso9660 *, struct file_info *);
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static int store_pending(struct iso9660 *, struct file_info *parent,
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const struct iso9660_directory_record *);
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static int toi(const void *p, int n);
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int
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@ -246,7 +254,7 @@ archive_read_format_iso9660_bid(struct archive *a)
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static int
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isPVD(struct iso9660 *iso9660, const char *h)
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{
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const struct primary_volume_descriptor *voldesc;
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const struct iso9660_primary_volume_descriptor *voldesc;
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if (h[0] != 1)
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return (0);
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@ -254,12 +262,12 @@ isPVD(struct iso9660 *iso9660, const char *h)
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return (0);
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voldesc = (const struct primary_volume_descriptor *)h;
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voldesc = (const struct iso9660_primary_volume_descriptor *)h;
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iso9660->logical_block_size = toi(&voldesc->logical_block_size, 2);
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/* Store the root directory in the pending list. */
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store_pending(iso9660, NULL,
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(struct directory_record *)&voldesc->root_directory_record);
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(struct iso9660_directory_record *)&voldesc->root_directory_record);
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return (48);
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}
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@ -269,63 +277,68 @@ archive_read_format_iso9660_read_header(struct archive *a,
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{
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struct stat st;
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struct iso9660 *iso9660;
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struct dir_rec *dirrec;
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struct file_info *file;
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ssize_t bytes_read;
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const void *buff;
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iso9660 = *(a->pformat_data);
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/* Get the next entry that appears after the current offset. */
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dirrec = next_entry(iso9660);
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if (dirrec == NULL)
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file = next_entry(iso9660);
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if (file == NULL)
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return (ARCHIVE_EOF);
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iso9660->entry_bytes_remaining = dirrec->size;
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iso9660->entry_bytes_remaining = file->size;
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iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
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/* Set up the entry structure with information about this entry. */
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memset(&st, 0, sizeof(st));
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st.st_mode = dirrec->mode;
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st.st_mtime = dirrec->mtime;
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st.st_mode = file->mode;
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st.st_uid = file->uid;
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st.st_gid = file->gid;
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st.st_nlink = file->nlinks;
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st.st_mtime = file->mtime;
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st.st_ctime = file->ctime;
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st.st_atime = file->atime;
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st.st_size = iso9660->entry_bytes_remaining;
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archive_entry_copy_stat(entry, &st);
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archive_string_empty(&iso9660->pathname);
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archive_entry_set_pathname(entry,
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build_pathname(&iso9660->pathname, dirrec));
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build_pathname(&iso9660->pathname, file));
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/* If this entry points to the same data as the previous
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* entry, convert this into a hardlink to that entry.
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* But don't bother for zero-length files. */
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if (dirrec->offset == iso9660->previous_offset
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&& dirrec->size == iso9660->previous_size
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&& dirrec->size > 0) {
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if (file->offset == iso9660->previous_offset
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&& file->size == iso9660->previous_size
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&& file->size > 0) {
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archive_entry_set_hardlink(entry,
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iso9660->previous_pathname.s);
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iso9660->entry_bytes_remaining = 0;
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iso9660->entry_sparse_offset = 0;
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release_dirrec(iso9660, dirrec);
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release_file(iso9660, file);
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return (ARCHIVE_OK);
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}
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/* If the offset is before our current position, we can't
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* seek backwards to extract it, so issue a warning. */
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if (dirrec->offset < iso9660->current_position) {
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if (file->offset < iso9660->current_position) {
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archive_set_error(a, ARCHIVE_ERRNO_MISC,
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"Ignoring out-of-order file");
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iso9660->entry_bytes_remaining = 0;
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iso9660->entry_sparse_offset = 0;
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release_dirrec(iso9660, dirrec);
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release_file(iso9660, file);
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return (ARCHIVE_WARN);
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}
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/* Seek forward to the start of the entry. */
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while (iso9660->current_position < dirrec->offset) {
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ssize_t step = dirrec->offset - iso9660->current_position;
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while (iso9660->current_position < file->offset) {
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ssize_t step = file->offset - iso9660->current_position;
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if (step > iso9660->logical_block_size)
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step = iso9660->logical_block_size;
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bytes_read = (a->compression_read_ahead)(a, &buff, step);
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if (bytes_read <= 0) {
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release_dirrec(iso9660, dirrec);
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release_file(iso9660, file);
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return (ARCHIVE_FATAL);
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}
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if (bytes_read > step)
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@ -334,8 +347,8 @@ archive_read_format_iso9660_read_header(struct archive *a,
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(a->compression_read_consume)(a, bytes_read);
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}
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iso9660->previous_size = dirrec->size;
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iso9660->previous_offset = dirrec->offset;
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iso9660->previous_size = file->size;
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iso9660->previous_offset = file->offset;
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archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s);
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/* If this is a directory, read in all of the entries right now. */
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@ -350,7 +363,7 @@ archive_read_format_iso9660_read_header(struct archive *a,
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if (bytes_read < step) {
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archive_set_error(a, ARCHIVE_ERRNO_MISC,
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"Failed to read full block when scanning ISO9660 directory list");
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release_dirrec(iso9660, dirrec);
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release_file(iso9660, file);
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return (ARCHIVE_FATAL);
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}
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if (bytes_read > step)
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@ -361,8 +374,8 @@ archive_read_format_iso9660_read_header(struct archive *a,
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for (p = block;
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*p != 0 && p < (const unsigned char *)block + bytes_read;
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p += *p) {
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const struct directory_record *dr
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= (const struct directory_record *)p;
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const struct iso9660_directory_record *dr
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= (const struct iso9660_directory_record *)p;
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/* Skip '.' entry. */
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if (dr->name_len[0] == 1
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&& dr->name[0] == '\0')
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@ -371,12 +384,12 @@ archive_read_format_iso9660_read_header(struct archive *a,
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if (dr->name_len[0] == 1
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&& dr->name[0] == '\001')
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continue;
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store_pending(iso9660, dirrec, dr);
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store_pending(iso9660, file, dr);
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}
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}
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}
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release_dirrec(iso9660, dirrec);
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release_file(iso9660, file);
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return (ARCHIVE_OK);
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}
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@ -413,21 +426,33 @@ static int
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archive_read_format_iso9660_cleanup(struct archive *a)
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{
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struct iso9660 *iso9660;
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struct file_info *file;
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iso9660 = *(a->pformat_data);
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while ((file = next_entry(iso9660)) != NULL)
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release_file(iso9660, file);
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archive_string_free(&iso9660->pathname);
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archive_string_free(&iso9660->previous_pathname);
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free(iso9660);
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*(a->pformat_data) = NULL;
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return (ARCHIVE_OK);
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}
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/*
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* This routine parses a single ISO directory record, makes sense
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* of any extensions, and stores the result in memory.
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*/
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static int
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store_pending(struct iso9660 *iso9660, struct dir_rec *parent,
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const struct directory_record *isodirent)
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store_pending(struct iso9660 *iso9660, struct file_info *parent,
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const struct iso9660_directory_record *isodirrec)
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{
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struct dir_rec *new_dirent;
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struct file_info *file;
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/* TODO: Sanity check that name_len doesn't exceed length, etc. */
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/* Expand our pending files list as necessary. */
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if (iso9660->pending_files_used >= iso9660->pending_files_allocated) {
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struct dir_rec **new_pending_files;
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struct file_info **new_pending_files;
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int new_size = iso9660->pending_files_allocated * 2;
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if (new_size < 1024)
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@ -441,47 +466,53 @@ store_pending(struct iso9660 *iso9660, struct dir_rec *parent,
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iso9660->pending_files_allocated = new_size;
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}
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new_dirent = malloc(sizeof(*new_dirent) + isodirent->name_len[0] + 1);
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new_dirent->parent = parent;
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/* Create a new file entry and copy data from the ISO dir record. */
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file = malloc(sizeof(*file));
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file->parent = parent;
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if (parent != NULL)
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parent->refcount++;
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new_dirent->refcount = 0;
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new_dirent->flags = isodirent->flags[0];
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new_dirent->offset = toi(isodirent->extent, 4)
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file->refcount = 0;
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file->offset = toi(isodirrec->extent, 4)
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* iso9660->logical_block_size;
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new_dirent->size = toi(isodirent->size, 4);
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new_dirent->mtime = isodate(isodirent->date);
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memcpy(new_dirent->name, isodirent->name, isodirent->name_len[0]);
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new_dirent->name[(int)isodirent->name_len[0]] = '\0';
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if (isodirent->flags[0] & 0x02)
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new_dirent->mode = S_IFDIR | 0700;
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file->size = toi(isodirrec->size, 4);
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file->mtime = isodate7(isodirrec->date);
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file->ctime = file->atime = file->mtime;
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file->name = malloc(isodirrec->name_len[0] + 1);
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file->nlinks = 0;
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file->uid = 0;
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file->gid = 0;
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memcpy(file->name, isodirrec->name, isodirrec->name_len[0]);
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file->name[(int)isodirrec->name_len[0]] = '\0';
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if (isodirrec->flags[0] & 0x02)
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file->mode = S_IFDIR | 0700;
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else
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new_dirent->mode = S_IFREG | 0400;
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file->mode = S_IFREG | 0400;
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iso9660->pending_files[iso9660->pending_files_used++] = new_dirent;
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/* Rockridge extensions overwrite information from above. */
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parse_rockridge(iso9660, isodirrec, file);
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iso9660->pending_files[iso9660->pending_files_used++] = file;
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/* DEBUGGING: Warn about attributes I don't yet fully support. */
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if ((isodirent->flags[0] & ~0x02) != 0) {
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if ((isodirrec->flags[0] & ~0x02) != 0) {
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fprintf(stderr, "\n ** Unrecognized flag: ");
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dump_isodirent(stderr, isodirent);
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dump_isodirrec(stderr, isodirrec);
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fprintf(stderr, "\n");
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} else if (toi(isodirent->volume_sequence_number, 2) != 1) {
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} else if (toi(isodirrec->volume_sequence_number, 2) != 1) {
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fprintf(stderr, "\n ** Unrecognized sequence number: ");
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dump_isodirent(stderr, isodirent);
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dump_isodirrec(stderr, isodirrec);
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fprintf(stderr, "\n");
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} else if (isodirent->file_unit_size[0] != 0) {
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} else if (isodirrec->file_unit_size[0] != 0) {
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fprintf(stderr, "\n ** Unexpected file unit size: ");
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dump_isodirent(stderr, isodirent);
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dump_isodirrec(stderr, isodirrec);
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fprintf(stderr, "\n");
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} else if (isodirent->interleave[0] != 0) {
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} else if (isodirrec->interleave[0] != 0) {
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fprintf(stderr, "\n ** Unexpected interleave: ");
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dump_isodirent(stderr, isodirent);
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dump_isodirrec(stderr, isodirrec);
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fprintf(stderr, "\n");
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} else if (isodirent->ext_attr_length[0] != 0) {
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} else if (isodirrec->ext_attr_length[0] != 0) {
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fprintf(stderr, "\n ** Unexpected extended attribute length: ");
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dump_isodirent(stderr, isodirent);
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dump_isodirrec(stderr, isodirrec);
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fprintf(stderr, "\n");
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}
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@ -489,28 +520,162 @@ store_pending(struct iso9660 *iso9660, struct dir_rec *parent,
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}
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static void
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release_dirrec(struct iso9660 *iso9660, struct dir_rec *dr)
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parse_rockridge(struct iso9660 *iso9660,
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const struct iso9660_directory_record *isodirrec, struct file_info *file)
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{
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struct dir_rec *parent;
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const unsigned char *p, *end;
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if (dr->refcount == 0) {
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dr->flags = 0xff;
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parent = dr->parent;
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free(dr);
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(void)iso9660; /* UNUSED */
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end = (const unsigned char *)isodirrec + isodirrec->length[0];
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p = isodirrec->name + isodirrec->name_len[0];
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if ((isodirrec->name_len[0] & 1) == 0)
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p++;
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while (p + 4 < end /* Enough space for another entry. */
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&& p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
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&& p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
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&& p + p[2] <= end) { /* Sanity-check length. */
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const unsigned char *data = p + 4;
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int data_length = p[2] - 4;
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int version = p[3]; /* Currently unused. */
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switch(p[0]) {
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case 'N':
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if (p[1] == 'M' && version == 1) { /* NM */
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/*
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* NM extension comprises:
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* one byte flag
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* rest is long name
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*/
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/* TODO: Obey flags. */
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char *old_name = file->name;
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file->name = malloc(data_length);
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if (file->name != NULL) {
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free(old_name);
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memcpy(file->name, data + 1, data_length - 1);
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file->name[data_length - 1] = '\0';
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} else {
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file->name = old_name;
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}
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}
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break;
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case 'P':
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if (p[1] == 'X' && version == 1) { /* PX */
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/*
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* PX extension comprises:
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* 8 bytes for mode,
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* 8 bytes for nlinks,
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* 8 bytes for uid,
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* 8 bytes for gid.
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*/
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if (data_length == 32) {
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file->mode = toi(data, 4);
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file->nlinks = toi(data + 8, 4);
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file->uid = toi(data + 16, 4);
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file->gid = toi(data + 24, 4);
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}
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}
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break;
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case 'R':
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if (p[1] == 'R' && version == 1) { /* RR */
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/*
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* RR extension comprises:
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*
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*/
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/* TODO: Handle RR extension. */
|
||||
}
|
||||
break;
|
||||
case 'T':
|
||||
if (p[1] == 'F' && version == 1) { /* TF */
|
||||
char flag = data[0];
|
||||
/*
|
||||
* TF extension comprises:
|
||||
* one byte flag
|
||||
* create time (optional)
|
||||
* modify time (optional)
|
||||
* access time (optional)
|
||||
* attribute time (optional)
|
||||
* Time format and presence of fields
|
||||
* is controlled by flag bits.
|
||||
*/
|
||||
data++;
|
||||
if (flag & 0x80) {
|
||||
/* Use 17-byte time format. */
|
||||
if (flag & 1) /* Create time. */
|
||||
data += 17;
|
||||
if (flag & 2) { /* Modify time. */
|
||||
file->mtime = isodate17(data);
|
||||
data += 17;
|
||||
}
|
||||
if (flag & 4) { /* Access time. */
|
||||
file->atime = isodate17(data);
|
||||
data += 17;
|
||||
}
|
||||
if (flag & 8) { /* Attribute time. */
|
||||
file->ctime = isodate17(data);
|
||||
data += 17;
|
||||
}
|
||||
} else {
|
||||
/* Use 7-byte time format. */
|
||||
if (flag & 1) /* Create time. */
|
||||
data += 7;
|
||||
if (flag & 2) { /* Modify time. */
|
||||
file->mtime = isodate7(data);
|
||||
data += 7;
|
||||
}
|
||||
if (flag & 4) { /* Access time. */
|
||||
file->atime = isodate7(data);
|
||||
data += 7;
|
||||
}
|
||||
if (flag & 8) { /* Attribute time. */
|
||||
file->ctime = isodate7(data);
|
||||
data += 7;
|
||||
}
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
{
|
||||
const unsigned char *t;
|
||||
fprintf(stderr, "\nUnsupported RRIP extension for %s\n", file->name);
|
||||
fprintf(stderr, " %c%c(%d):", p[0], p[1], data_length);
|
||||
for (t = data; t < data + data_length && t < data + 16; t++)
|
||||
fprintf(stderr, " %02x", *t);
|
||||
fprintf(stderr, "\n");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
p += p[2];
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
release_file(struct iso9660 *iso9660, struct file_info *file)
|
||||
{
|
||||
struct file_info *parent;
|
||||
|
||||
if (file->refcount == 0) {
|
||||
parent = file->parent;
|
||||
if (file->name)
|
||||
free(file->name);
|
||||
free(file);
|
||||
if (parent != NULL) {
|
||||
parent->refcount--;
|
||||
release_dirrec(iso9660, parent);
|
||||
release_file(iso9660, parent);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static struct dir_rec *
|
||||
static struct file_info *
|
||||
next_entry(struct iso9660 *iso9660)
|
||||
{
|
||||
int least_index;
|
||||
uint64_t least_end_offset;
|
||||
int i;
|
||||
struct dir_rec *r;
|
||||
struct file_info *r;
|
||||
|
||||
if (iso9660->pending_files_used < 1)
|
||||
return (NULL);
|
||||
@ -548,7 +713,7 @@ toi(const void *p, int n)
|
||||
}
|
||||
|
||||
static time_t
|
||||
isodate(const void *p)
|
||||
isodate7(const void *p)
|
||||
{
|
||||
struct tm tm;
|
||||
const unsigned char *v = (const unsigned char *)p;
|
||||
@ -561,33 +726,61 @@ isodate(const void *p)
|
||||
tm.tm_sec = v[5];
|
||||
/* v[6] is the timezone offset, in 1/4-hour increments. */
|
||||
offset = ((const signed char *)p)[6];
|
||||
tm.tm_hour -= offset / 4;
|
||||
tm.tm_min -= (offset % 4) * 15;
|
||||
if (offset > -48 && offset < 52) {
|
||||
tm.tm_hour -= offset / 4;
|
||||
tm.tm_min -= (offset % 4) * 15;
|
||||
}
|
||||
return (timegm(&tm));
|
||||
}
|
||||
|
||||
static time_t
|
||||
isodate17(const void *p)
|
||||
{
|
||||
struct tm tm;
|
||||
const unsigned char *v = (const unsigned char *)p;
|
||||
int offset;
|
||||
tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100
|
||||
+ (v[2] - '0') * 10 + (v[3] - '0')
|
||||
- 1900;
|
||||
tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0');
|
||||
tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0');
|
||||
tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0');
|
||||
tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0');
|
||||
tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0');
|
||||
/* v[16] is the timezone offset, in 1/4-hour increments. */
|
||||
offset = ((const signed char *)p)[16];
|
||||
if (offset > -48 && offset < 52) {
|
||||
tm.tm_hour -= offset / 4;
|
||||
tm.tm_min -= (offset % 4) * 15;
|
||||
}
|
||||
return (timegm(&tm));
|
||||
}
|
||||
|
||||
static const char *
|
||||
build_pathname(struct archive_string *as, struct dir_rec *dr)
|
||||
build_pathname(struct archive_string *as, struct file_info *file)
|
||||
{
|
||||
if (dr->parent != NULL && dr->parent->name[0] != '\0') {
|
||||
build_pathname(as, dr->parent);
|
||||
if (file->parent != NULL && file->parent->name[0] != '\0') {
|
||||
build_pathname(as, file->parent);
|
||||
archive_strcat(as, "/");
|
||||
}
|
||||
archive_strcat(as, dr->name);
|
||||
if (file->name[0] == '\0')
|
||||
archive_strcat(as, ".");
|
||||
else
|
||||
archive_strcat(as, file->name);
|
||||
return (as->s);
|
||||
}
|
||||
|
||||
static void
|
||||
dump_isodirent(FILE *out, const struct directory_record *isodirent)
|
||||
dump_isodirrec(FILE *out, const struct iso9660_directory_record *isodirrec)
|
||||
{
|
||||
fprintf(out, " l %d,", isodirent->length[0]);
|
||||
fprintf(out, " a %d,", isodirent->ext_attr_length[0]);
|
||||
fprintf(out, " ext 0x%x,", toi(isodirent->extent, 4));
|
||||
fprintf(out, " s %d,", toi(isodirent->size, 4));
|
||||
fprintf(out, " f 0x%02x,", isodirent->flags[0]);
|
||||
fprintf(out, " u %d,", isodirent->file_unit_size[0]);
|
||||
fprintf(out, " ilv %d,", isodirent->interleave[0]);
|
||||
fprintf(out, " seq %d,", toi(isodirent->volume_sequence_number,2));
|
||||
fprintf(out, " nl %d:", isodirent->name_len[0]);
|
||||
fprintf(out, " `%.*s'", isodirent->name_len[0], isodirent->name);
|
||||
fprintf(out, " l %d,", isodirrec->length[0]);
|
||||
fprintf(out, " a %d,", isodirrec->ext_attr_length[0]);
|
||||
fprintf(out, " ext 0x%x,", toi(isodirrec->extent, 4));
|
||||
fprintf(out, " s %d,", toi(isodirrec->size, 4));
|
||||
fprintf(out, " f 0x%02x,", isodirrec->flags[0]);
|
||||
fprintf(out, " u %d,", isodirrec->file_unit_size[0]);
|
||||
fprintf(out, " ilv %d,", isodirrec->interleave[0]);
|
||||
fprintf(out, " seq %d,", toi(isodirrec->volume_sequence_number,2));
|
||||
fprintf(out, " nl %d:", isodirrec->name_len[0]);
|
||||
fprintf(out, " `%.*s'", isodirrec->name_len[0], isodirrec->name);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user