d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
a99f7ca21e
freebsd-dev/lib/libarchive/archive_read_support_format_iso9660.c
Tim Kientzle a46c33df05 Fine-tune the format detection for CPIO and ISO9660 sub-types. 
This has no impact on the actual operation, it just fixes some
inaccuracies in the format code and description reported back to the caller.
2005-11-08 07:41:03 +00:00

1062 lines
30 KiB
C
Raw Blame History

/*-
* Copyright (c) 2003-2004 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#include <sys/stat.h>
#include <errno.h>
/* #include <stdint.h> */ /* See archive_platform.h */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_string.h"
/*
* An overview of ISO 9660 format:
*
* Each disk is laid out as follows:
* * 32k reserved for private use
* * Volume descriptor table. Each volume descriptor
* is 2k and specifies basic format information.
* The "Primary Volume Descriptor" (PVD) is defined by the
* standard and should always be present; other volume
* descriptors include various vendor-specific extensions.
* * Files and directories. Each file/dir is specified by
* an "extent" (starting sector and length in bytes).
* Dirs are just files with directory records packed one
* after another. The PVD contains a single dir entry
* specifying the location of the root directory. Everything
* else follows from there.
*
* This module works by first reading the volume descriptors, then
* building a list of directory entries, sorted by starting
* sector. At each step, I look for the earliest dir entry that
* hasn't yet been read, seek forward to that location and read
* that entry. If it's a dir, I slurp in the new dir entries and
* add them to the heap; if it's a regular file, I return the
* corresponding archive_entry and wait for the client to request
* the file body. This strategy allows us to read most compliant
* CDs with a single pass through the data, as required by libarchive.
*/
/* Structure of on-disk PVD. */
struct iso9660_primary_volume_descriptor {
unsigned char type[1];
char id[5];
unsigned char version[1];
char reserved1[1];
char system_id[32];
char volume_id[32];
char reserved2[8];
char volume_space_size[8];
char reserved3[32];
char volume_set_size[4];
char volume_sequence_number[4];
char logical_block_size[4];
char path_table_size[8];
char type_1_path_table[4];
char opt_type_1_path_table[4];
char type_m_path_table[4];
char opt_type_m_path_table[4];
char root_directory_record[34];
char volume_set_id[128];
char publisher_id[128];
char preparer_id[128];
char application_id[128];
char copyright_file_id[37];
char abstract_file_id[37];
char bibliographic_file_id[37];
char creation_date[17];
char modification_date[17];
char expiration_date[17];
char effective_date[17];
char file_structure_version[1];
char reserved4[1];
char application_data[512];
};
/* Structure of an on-disk directory record. */
struct iso9660_directory_record {
unsigned char length[1];
unsigned char ext_attr_length[1];
unsigned char extent[8];
unsigned char size[8];
char date[7];
unsigned char flags[1];
unsigned char file_unit_size[1];
unsigned char interleave[1];
unsigned char volume_sequence_number[4];
unsigned char name_len[1];
char name[1];
};
/*
* Our private data.
*/
/* In-memory storage for a directory record. */
struct file_info {
struct file_info *parent;
int refcount;
uint64_t offset; /* Offset on disk. */
uint64_t size; /* File size in bytes. */
uint64_t ce_offset; /* Offset of CE */
uint64_t ce_size; /* Size of CE */
time_t mtime; /* File last modified time. */
time_t atime; /* File last accessed time. */
time_t ctime; /* File creation time. */
mode_t mode;
uid_t uid;
gid_t gid;
ino_t inode;
int nlinks;
char *name; /* Null-terminated filename. */
struct archive_string symlink;
};
struct iso9660 {
int magic;
#define ISO9660_MAGIC 0x96609660
int bid; /* If non-zero, return this as our bid. */
struct archive_string pathname;
char seenRockridge; /* Set true if RR extensions are used. */
unsigned char suspOffset;
uint64_t previous_offset;
uint64_t previous_size;
struct archive_string previous_pathname;
/* TODO: Make this a heap for fast inserts and deletions. */
struct file_info **pending_files;
int pending_files_allocated;
int pending_files_used;
uint64_t current_position;
ssize_t logical_block_size;
off_t entry_sparse_offset;
ssize_t entry_bytes_remaining;
};
static void add_entry(struct iso9660 *iso9660, struct file_info *file);
static int archive_read_format_iso9660_bid(struct archive *);
static int archive_read_format_iso9660_cleanup(struct archive *);
static int archive_read_format_iso9660_read_data(struct archive *,
const void **, size_t *, off_t *);
static int archive_read_format_iso9660_read_header(struct archive *,
struct archive_entry *);
static const char *build_pathname(struct archive_string *, struct file_info *);
static void dump_isodirrec(FILE *, const struct iso9660_directory_record *);
static time_t time_from_tm(struct tm *);
static time_t isodate17(const void *);
static time_t isodate7(const void *);
static int isPVD(struct iso9660 *, const char *);
static struct file_info *next_entry(struct iso9660 *);
static int next_entry_seek(struct archive *a, struct iso9660 *iso9660,
struct file_info **pfile);
static struct file_info *
parse_file_info(struct iso9660 *iso9660,
struct file_info *parent,
const struct iso9660_directory_record *isodirrec);
static void parse_rockridge(struct iso9660 *iso9660,
struct file_info *file, const unsigned char *start,
const unsigned char *end);
static void release_file(struct iso9660 *, struct file_info *);
static int toi(const void *p, int n);
int
archive_read_support_format_iso9660(struct archive *a)
{
struct iso9660 *iso9660;
int r;
iso9660 = malloc(sizeof(*iso9660));
if (iso9660 == NULL) {
archive_set_error(a, ENOMEM, "Can't allocate iso9660 data");
return (ARCHIVE_FATAL);
}
memset(iso9660, 0, sizeof(*iso9660));
iso9660->magic = ISO9660_MAGIC;
iso9660->bid = -1; /* We haven't yet bid. */
r = __archive_read_register_format(a,
iso9660,
archive_read_format_iso9660_bid,
archive_read_format_iso9660_read_header,
archive_read_format_iso9660_read_data,
NULL,
archive_read_format_iso9660_cleanup);
if (r != ARCHIVE_OK) {
free(iso9660);
return (r);
}
return (ARCHIVE_OK);
}
static int
archive_read_format_iso9660_bid(struct archive *a)
{
struct iso9660 *iso9660;
ssize_t bytes_read;
const void *h;
const char *p;
iso9660 = *(a->pformat_data);
if (iso9660->bid >= 0)
return (iso9660->bid);
/*
* Skip the first 32k (reserved area) and get the first
* 8 sectors of the volume descriptor table. Of course,
* if the I/O layer gives us more, we'll take it.
*/
bytes_read = (a->compression_read_ahead)(a, &h, 32768 + 8*2048);
if (bytes_read < 32768 + 8*2048)
return (iso9660->bid = -1);
p = (const char *)h;
/* Skip the reserved area. */
bytes_read -= 32768;
p += 32768;
/* Check each volume descriptor to locate the PVD. */
for (; bytes_read > 2048; bytes_read -= 2048, p += 2048) {
iso9660->bid = isPVD(iso9660, p);
if (iso9660->bid > 0)
return (iso9660->bid);
if (*p == '\xff') /* End-of-volume-descriptor marker. */
break;
}
/* We didn't find a valid PVD; return a bid of zero. */
iso9660->bid = 0;
return (iso9660->bid);
}
static int
isPVD(struct iso9660 *iso9660, const char *h)
{
const struct iso9660_primary_volume_descriptor *voldesc;
struct file_info *file;
if (h[0] != 1)
return (0);
if (memcmp(h+1, "CD001", 5) != 0)
return (0);
voldesc = (const struct iso9660_primary_volume_descriptor *)h;
iso9660->logical_block_size = toi(&voldesc->logical_block_size, 2);
/* Store the root directory in the pending list. */
file = parse_file_info(iso9660, NULL,
(struct iso9660_directory_record *)&voldesc->root_directory_record);
add_entry(iso9660, file);
return (48);
}
static int
archive_read_format_iso9660_read_header(struct archive *a,
struct archive_entry *entry)
{
struct stat st;
struct iso9660 *iso9660;
struct file_info *file;
ssize_t bytes_read;
int r;
iso9660 = *(a->pformat_data);
if (!a->archive_format) {
a->archive_format = ARCHIVE_FORMAT_ISO9660;
a->archive_format_name = "ISO9660";
}
/* Get the next entry that appears after the current offset. */
r = next_entry_seek(a, iso9660, &file);
if (r != ARCHIVE_OK)
return (r);
iso9660->entry_bytes_remaining = file->size;
iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
/* Set up the entry structure with information about this entry. */
memset(&st, 0, sizeof(st));
st.st_mode = file->mode;
st.st_uid = file->uid;
st.st_gid = file->gid;
st.st_nlink = file->nlinks;
st.st_ino = file->inode;
st.st_mtime = file->mtime;
st.st_ctime = file->ctime;
st.st_atime = file->atime;
st.st_size = iso9660->entry_bytes_remaining;
archive_entry_copy_stat(entry, &st);
archive_string_empty(&iso9660->pathname);
archive_entry_set_pathname(entry,
build_pathname(&iso9660->pathname, file));
if (file->symlink.s != NULL)
archive_entry_set_symlink(entry, file->symlink.s);
/* If this entry points to the same data as the previous
* entry, convert this into a hardlink to that entry.
* But don't bother for zero-length files. */
if (file->offset == iso9660->previous_offset
&& file->size == iso9660->previous_size
&& file->size > 0) {
archive_entry_set_hardlink(entry,
iso9660->previous_pathname.s);
iso9660->entry_bytes_remaining = 0;
iso9660->entry_sparse_offset = 0;
release_file(iso9660, file);
return (ARCHIVE_OK);
}
/* If the offset is before our current position, we can't
* seek backwards to extract it, so issue a warning. */
if (file->offset < iso9660->current_position) {
archive_set_error(a, ARCHIVE_ERRNO_MISC,
"Ignoring out-of-order file");
iso9660->entry_bytes_remaining = 0;
iso9660->entry_sparse_offset = 0;
release_file(iso9660, file);
return (ARCHIVE_WARN);
}
iso9660->previous_size = file->size;
iso9660->previous_offset = file->offset;
archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s);
/* If this is a directory, read in all of the entries right now. */
if (S_ISDIR(st.st_mode)) {
while(iso9660->entry_bytes_remaining > 0) {
const void *block;
const unsigned char *p;
ssize_t step = iso9660->logical_block_size;
if (step > iso9660->entry_bytes_remaining)
step = iso9660->entry_bytes_remaining;
bytes_read = (a->compression_read_ahead)(a, &block, step);
if (bytes_read < step) {
archive_set_error(a, ARCHIVE_ERRNO_MISC,
"Failed to read full block when scanning ISO9660 directory list");
release_file(iso9660, file);
return (ARCHIVE_FATAL);
}
if (bytes_read > step)
bytes_read = step;
(a->compression_read_consume)(a, bytes_read);
iso9660->current_position += bytes_read;
iso9660->entry_bytes_remaining -= bytes_read;
for (p = block;
*p != 0 && p < (const unsigned char *)block + bytes_read;
p += *p) {
const struct iso9660_directory_record *dr
= (const struct iso9660_directory_record *)p;
struct file_info *child;
/* Skip '.' entry. */
if (dr->name_len[0] == 1
&& dr->name[0] == '\0')
continue;
/* Skip '..' entry. */
if (dr->name_len[0] == 1
&& dr->name[0] == '\001')
continue;
child = parse_file_info(iso9660, file, dr);
add_entry(iso9660, child);
if (iso9660->seenRockridge) {
a->archive_format =
ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
a->archive_format_name =
"ISO9660 with Rockridge extensions";
}
}
}
}
release_file(iso9660, file);
return (ARCHIVE_OK);
}
static int
archive_read_format_iso9660_read_data(struct archive *a,
const void **buff, size_t *size, off_t *offset)
{
ssize_t bytes_read;
struct iso9660 *iso9660;
iso9660 = *(a->pformat_data);
if (iso9660->entry_bytes_remaining <= 0) {
*buff = NULL;
*size = 0;
*offset = iso9660->entry_sparse_offset;
return (ARCHIVE_EOF);
}
bytes_read = (a->compression_read_ahead)(a, buff, 1);
if (bytes_read == 0)
archive_set_error(a, ARCHIVE_ERRNO_MISC,
"Truncated input file");
if (bytes_read <= 0)
return (ARCHIVE_FATAL);
if (bytes_read > iso9660->entry_bytes_remaining)
bytes_read = iso9660->entry_bytes_remaining;
*size = bytes_read;
*offset = iso9660->entry_sparse_offset;
iso9660->entry_sparse_offset += bytes_read;
iso9660->entry_bytes_remaining -= bytes_read;
iso9660->current_position += bytes_read;
(a->compression_read_consume)(a, bytes_read);
return (ARCHIVE_OK);
}
static int
archive_read_format_iso9660_cleanup(struct archive *a)
{
struct iso9660 *iso9660;
struct file_info *file;
iso9660 = *(a->pformat_data);
while ((file = next_entry(iso9660)) != NULL)
release_file(iso9660, file);
archive_string_free(&iso9660->pathname);
archive_string_free(&iso9660->previous_pathname);
free(iso9660);
*(a->pformat_data) = NULL;
return (ARCHIVE_OK);
}
/*
* This routine parses a single ISO directory record, makes sense
* of any extensions, and stores the result in memory.
*/
static struct file_info *
parse_file_info(struct iso9660 *iso9660, struct file_info *parent,
const struct iso9660_directory_record *isodirrec)
{
struct file_info *file;
/* TODO: Sanity check that name_len doesn't exceed length, etc. */
/* Create a new file entry and copy data from the ISO dir record. */
file = malloc(sizeof(*file));
if (file == NULL)
return (NULL);
memset(file, 0, sizeof(*file));
file->parent = parent;
if (parent != NULL)
parent->refcount++;
file->offset = toi(isodirrec->extent, 4)
* iso9660->logical_block_size;
file->size = toi(isodirrec->size, 4);
file->mtime = isodate7(isodirrec->date);
file->ctime = file->atime = file->mtime;
file->name = malloc(isodirrec->name_len[0] + 1);
if (file->name == NULL) {
free(file);
return (NULL);
}
memcpy(file->name, isodirrec->name, isodirrec->name_len[0]);
file->name[(int)isodirrec->name_len[0]] = '\0';
if (isodirrec->flags[0] & 0x02)
file->mode = S_IFDIR | 0700;
else
file->mode = S_IFREG | 0400;
/* Rockridge extensions overwrite information from above. */
{
const unsigned char *rr_start, *rr_end;
rr_end = (const unsigned char *)isodirrec
+ isodirrec->length[0];
rr_start = (const unsigned char *)isodirrec->name
+ isodirrec->name_len[0];
if ((isodirrec->name_len[0] & 1) == 0)
rr_start++;
rr_start += iso9660->suspOffset;
parse_rockridge(iso9660, file, rr_start, rr_end);
}
/* DEBUGGING: Warn about attributes I don't yet fully support. */
if ((isodirrec->flags[0] & ~0x02) != 0) {
fprintf(stderr, "\n ** Unrecognized flag: ");
dump_isodirrec(stderr, isodirrec);
fprintf(stderr, "\n");
} else if (toi(isodirrec->volume_sequence_number, 2) != 1) {
fprintf(stderr, "\n ** Unrecognized sequence number: ");
dump_isodirrec(stderr, isodirrec);
fprintf(stderr, "\n");
} else if (isodirrec->file_unit_size[0] != 0) {
fprintf(stderr, "\n ** Unexpected file unit size: ");
dump_isodirrec(stderr, isodirrec);
fprintf(stderr, "\n");
} else if (isodirrec->interleave[0] != 0) {
fprintf(stderr, "\n ** Unexpected interleave: ");
dump_isodirrec(stderr, isodirrec);
fprintf(stderr, "\n");
} else if (isodirrec->ext_attr_length[0] != 0) {
fprintf(stderr, "\n ** Unexpected extended attribute length: ");
dump_isodirrec(stderr, isodirrec);
fprintf(stderr, "\n");
}
return (file);
}
static void
add_entry(struct iso9660 *iso9660, struct file_info *file)
{
/* Expand our pending files list as necessary. */
if (iso9660->pending_files_used >= iso9660->pending_files_allocated) {
struct file_info **new_pending_files;
int new_size = iso9660->pending_files_allocated * 2;
if (new_size < 1024)
new_size = 1024;
new_pending_files = malloc(new_size * sizeof(new_pending_files[0]));
if (new_pending_files == NULL)
__archive_errx(1, "Out of memory");
memcpy(new_pending_files, iso9660->pending_files,
iso9660->pending_files_allocated * sizeof(new_pending_files[0]));
if (iso9660->pending_files != NULL)
free(iso9660->pending_files);
iso9660->pending_files = new_pending_files;
iso9660->pending_files_allocated = new_size;
}
iso9660->pending_files[iso9660->pending_files_used++] = file;
}
static void
parse_rockridge(struct iso9660 *iso9660, struct file_info *file,
const unsigned char *p, const unsigned char *end)
{
(void)iso9660; /* UNUSED */
while (p + 4 < end /* Enough space for another entry. */
&& p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
&& p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
&& p + p[2] <= end) { /* Sanity-check length. */
const unsigned char *data = p + 4;
int data_length = p[2] - 4;
int version = p[3];
/*
* Yes, each 'if' here does test p[0] again.
* Otherwise, the fall-through handling to catch
* unsupported extensions doesn't work.
*/
switch(p[0]) {
case 'C':
if (p[0] == 'C' && p[1] == 'E' && version == 1) {
/*
* CE extension comprises:
* 8 byte sector containing extension
* 8 byte offset w/in above sector
* 8 byte length of continuation
*/
file->ce_offset = toi(data, 4)
* iso9660->logical_block_size
+ toi(data + 8, 4);
file->ce_size = toi(data + 16, 4);
break;
}
/* FALLTHROUGH */
case 'N':
if (p[0] == 'N' && p[1] == 'M' && version == 1
&& *data == 0) {
/* NM extension with flag byte == 0 */
/*
* NM extension comprises:
* one byte flag
* rest is long name
*/
/* TODO: Obey flags. */
char *old_name = file->name;
data++; /* Skip flag byte. */
data_length--;
file->name = malloc(data_length + 1);
if (file->name != NULL) {
free(old_name);
memcpy(file->name, data, data_length);
file->name[data_length] = '\0';
} else
file->name = old_name;
break;
}
/* FALLTHROUGH */
case 'P':
if (p[0] == 'P' && p[1] == 'D' && version == 1) {
/*
* PD extension is padding;
* contents are always ignored.
*/
break;
}
if (p[0] == 'P' && p[1] == 'X' && version == 1) {
/*
* PX extension comprises:
* 8 bytes for mode,
* 8 bytes for nlinks,
* 8 bytes for uid,
* 8 bytes for gid,
* 8 bytes for inode.
*/
if (data_length == 32) {
file->mode = toi(data, 4);
file->nlinks = toi(data + 8, 4);
file->uid = toi(data + 16, 4);
file->gid = toi(data + 24, 4);
file->inode = toi(data + 32, 4);
}
break;
}
/* FALLTHROUGH */
case 'R':
if (p[0] == 'R' && p[1] == 'R' && version == 1) {
iso9660->seenRockridge = 1;
/*
* RR extension comprises:
* one byte flag value
*/
/* TODO: Handle RR extension. */
break;
}
/* FALLTHROUGH */
case 'S':
if (p[0] == 'S' && p[1] == 'L' && version == 1
&& *data == 0) {
int cont = 1;
/* SL extension with flags == 0 */
/* TODO: handle non-zero flag values. */
data++; /* Skip flag byte. */
data_length--;
while (data_length > 0) {
unsigned char flag = *data++;
unsigned char nlen = *data++;
data_length -= 2;
if (cont == 0)
archive_strcat(&file->symlink, "/");
cont = 0;
switch(flag) {
case 0x01: /* Continue */
archive_strncat(&file->symlink,
(const char *)data, nlen);
cont = 1;
break;
case 0x02: /* Current */
archive_strcat(&file->symlink, ".");
break;
case 0x04: /* Parent */
archive_strcat(&file->symlink, "..");
break;
case 0x08: /* Root */
case 0x10: /* Volume root */
archive_string_empty(&file->symlink);
break;
case 0x20: /* Hostname */
archive_strcat(&file->symlink, "hostname");
break;
case 0:
archive_strncat(&file->symlink,
(const char *)data, nlen);
break;
default:
/* TODO: issue a warning ? */
break;
}
data += nlen;
data_length -= nlen;
}
break;
}
if (p[0] == 'S' && p[1] == 'P'
&& version == 1 && data_length == 7
&& data[0] == (unsigned char)'\xbe'
&& data[1] == (unsigned char)'\xef') {
/*
* SP extension stores the suspOffset
* (Number of bytes to skip between
* filename and SUSP records.)
* It is mandatory by the SUSP standard
* (IEEE 1281).
*
* It allows SUSP to coexist with
* non-SUSP uses of the System
* Use Area by placing non-SUSP data
* before SUSP data.
*
* TODO: Add a check for 'SP' in
* first directory entry, disable all SUSP
* processing if not found.
*/
iso9660->suspOffset = data[2];
break;
}
if (p[0] == 'S' && p[1] == 'T'
&& data_length == 0 && version == 1) {
/*
* ST extension marks end of this
* block of SUSP entries.
*
* It allows SUSP to coexist with
* non-SUSP uses of the System
* Use Area by placing non-SUSP data
* after SUSP data.
*/
return;
}
case 'T':
if (p[0] == 'T' && p[1] == 'F' && version == 1) {
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;
}
/* FALLTHROUGH */
default:
/* The FALLTHROUGHs above leave us here for
* any unsupported extension. */
{
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);
archive_string_free(&file->symlink);
free(file);
if (parent != NULL) {
parent->refcount--;
release_file(iso9660, parent);
}
}
}
static int
next_entry_seek(struct archive *a, struct iso9660 *iso9660,
struct file_info **pfile)
{
struct file_info *file;
uint64_t offset;
*pfile = NULL;
for (;;) {
*pfile = file = next_entry(iso9660);
if (file == NULL)
return (ARCHIVE_EOF);
/* CE area precedes actual file data? Ignore it. */
if (file->ce_offset > file->offset) {
fprintf(stderr, " *** Discarding CE data.\n");
file->ce_offset = 0;
file->ce_size = 0;
}
/* If CE exists, find and read it now. */
if (file->ce_offset > 0)
offset = file->ce_offset;
else
offset = file->offset;
/* Seek forward to the start of the entry. */
while (iso9660->current_position < offset) {
ssize_t step = offset - iso9660->current_position;
ssize_t bytes_read;
const void *buff;
if (step > iso9660->logical_block_size)
step = iso9660->logical_block_size;
bytes_read = (a->compression_read_ahead)(a, &buff, step);
if (bytes_read <= 0) {
release_file(iso9660, file);
return (ARCHIVE_FATAL);
}
if (bytes_read > step)
bytes_read = step;
iso9660->current_position += bytes_read;
(a->compression_read_consume)(a, bytes_read);
}
/* We found body of file; handle it now. */
if (offset == file->offset)
return (ARCHIVE_OK);
/* Found CE? Process it and push the file back onto list. */
if (offset == file->ce_offset) {
const void *p;
ssize_t size = file->ce_size;
ssize_t bytes_read;
const unsigned char *rr_start;
file->ce_offset = 0;
file->ce_size = 0;
bytes_read = (a->compression_read_ahead)(a, &p, size);
if (bytes_read > size)
bytes_read = size;
rr_start = (const unsigned char *)p;
parse_rockridge(iso9660, file, rr_start,
rr_start + bytes_read);
(a->compression_read_consume)(a, bytes_read);
iso9660->current_position += bytes_read;
add_entry(iso9660, file);
}
}
}
static struct file_info *
next_entry(struct iso9660 *iso9660)
{
int least_index;
uint64_t least_end_offset;
int i;
struct file_info *r;
if (iso9660->pending_files_used < 1)
return (NULL);
/* Assume the first file in the list is the earliest on disk. */
least_index = 0;
least_end_offset = iso9660->pending_files[0]->offset
+ iso9660->pending_files[0]->size;
/* Now, try to find an earlier one. */
for(i = 0; i < iso9660->pending_files_used; i++) {
/* Use the position of the file *end* as our comparison. */
uint64_t end_offset = iso9660->pending_files[i]->offset
+ iso9660->pending_files[i]->size;
if (iso9660->pending_files[i]->ce_offset > 0
&& iso9660->pending_files[i]->ce_offset < iso9660->pending_files[i]->offset)
end_offset = iso9660->pending_files[i]->ce_offset
+ iso9660->pending_files[i]->ce_size;
if (least_end_offset > end_offset) {
least_index = i;
least_end_offset = end_offset;
}
}
r = iso9660->pending_files[least_index];
iso9660->pending_files[least_index]
= iso9660->pending_files[--iso9660->pending_files_used];
return (r);
}
static int
toi(const void *p, int n)
{
const unsigned char *v = (const unsigned char *)p;
if (n > 1)
return v[0] + 256 * toi(v + 1, n - 1);
if (n == 1)
return v[0];
return (0);
}
static time_t
isodate7(const void *p)
{
struct tm tm;
const unsigned char *v = (const unsigned char *)p;
int offset;
memset(&tm, 0, sizeof(tm));
tm.tm_year = v[0];
tm.tm_mon = v[1] - 1;
tm.tm_mday = v[2];
tm.tm_hour = v[3];
tm.tm_min = v[4];
tm.tm_sec = v[5];
/* v[6] is the timezone offset, in 1/4-hour increments. */
offset = ((const signed char *)p)[6];
if (offset > -48 && offset < 52) {
tm.tm_hour -= offset / 4;
tm.tm_min -= (offset % 4) * 15;
}
return (time_from_tm(&tm));
}
static time_t
isodate17(const void *p)
{
struct tm tm;
const unsigned char *v = (const unsigned char *)p;
int offset;
memset(&tm, 0, sizeof(tm));
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 (time_from_tm(&tm));
}
/*
* timegm() converts a struct tm to a time_t, except it isn't standard,
* so I provide my own function here that (ideally) is just a wrapper
* for timegm().
*/
static time_t
time_from_tm(struct tm *t)
{
#if HAVE_TIMEGM
return (timegm(t));
#else
/*
* Unfortunately, timegm() isn't standard. The standard
* mktime() function is a close match, except that it uses
* local timezone instead of GMT. Close enough for now.
* Note that it is not possible to emulate timegm() using
* standard interfaces:
* * ANSI C90 does not even guarantee that time_t is
* an arithmetic type, so time adjustments can only be
* done by manipulating struct tm elements. You cannot
* portably calculate time_t values.
* * POSIX does promise that time_t is an arithmetic type
* measured in seconds, so you can do time_t calculations
* while remaining POSIX-compliant.
* * Neither ANSI nor POSIX provides an easy way to measure
* the timezone offset, so you can't adjust mktime() to
* work like timegm().
* * POSIX does not promise that the epoch begins in 1970,
* so you can't write a portable timegm() function from
* scratch.
*/
time_t result = mktime(t);
/* TODO: Find a way to improve this approximation to timegm(). */
return result;
#endif
}
static const char *
build_pathname(struct archive_string *as, struct file_info *file)
{
if (file->parent != NULL && file->parent->name[0] != '\0') {
build_pathname(as, file->parent);
archive_strcat(as, "/");
}
if (file->name[0] == '\0')
archive_strcat(as, ".");
else
archive_strcat(as, file->name);
return (as->s);
}
static void
dump_isodirrec(FILE *out, const struct iso9660_directory_record *isodirrec)
{
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);
}
Reference in New Issue View Git Blame Copy Permalink