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php-src/ext/phar/tar.c
Anatol Belski 4d997f63d9 master renames phase 3
2014-08-25 20:22:49 +02:00

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/*
+----------------------------------------------------------------------+
| TAR archive support for Phar |
+----------------------------------------------------------------------+
| Copyright (c) 2005-2014 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <dmitry@zend.com> |
| Gregory Beaver <cellog@php.net> |
+----------------------------------------------------------------------+
*/
#include "phar_internal.h"
static php_uint32 phar_tar_number(char *buf, int len) /* {{{ */
{
php_uint32 num = 0;
int i = 0;
while (i < len && buf[i] == ' ') {
++i;
}
while (i < len && buf[i] >= '0' && buf[i] <= '7') {
num = num * 8 + (buf[i] - '0');
++i;
}
return num;
}
/* }}} */
/* adapted from format_octal() in libarchive
*
* Copyright (c) 2003-2009 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.
* 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.
*/
static int phar_tar_octal(char *buf, php_uint32 val, int len) /* {{{ */
{
char *p = buf;
int s = len;
p += len; /* Start at the end and work backwards. */
while (s-- > 0) {
*--p = (char)('0' + (val & 7));
val >>= 3;
}
if (val == 0)
return SUCCESS;
/* If it overflowed, fill field with max value. */
while (len-- > 0)
*p++ = '7';
return FAILURE;
}
/* }}} */
static php_uint32 phar_tar_checksum(char *buf, int len) /* {{{ */
{
php_uint32 sum = 0;
char *end = buf + len;
while (buf != end) {
sum += (unsigned char)*buf;
++buf;
}
return sum;
}
/* }}} */
int phar_is_tar(char *buf, char *fname) /* {{{ */
{
tar_header *header = (tar_header *) buf;
php_uint32 checksum = phar_tar_number(header->checksum, sizeof(header->checksum));
php_uint32 ret;
char save[sizeof(header->checksum)];
/* assume that the first filename in a tar won't begin with <?php */
if (!strncmp(buf, "<?php", sizeof("<?php")-1)) {
return 0;
}
memcpy(save, header->checksum, sizeof(header->checksum));
memset(header->checksum, ' ', sizeof(header->checksum));
ret = (checksum == phar_tar_checksum(buf, 512));
memcpy(header->checksum, save, sizeof(header->checksum));
if (!ret && strstr(fname, ".tar")) {
/* probably a corrupted tar - so we will pretend it is one */
return 1;
}
return ret;
}
/* }}} */
int phar_open_or_create_tar(char *fname, int fname_len, char *alias, int alias_len, int is_data, int options, phar_archive_data** pphar, char **error TSRMLS_DC) /* {{{ */
{
phar_archive_data *phar;
int ret = phar_create_or_parse_filename(fname, fname_len, alias, alias_len, is_data, options, &phar, error TSRMLS_CC);
if (FAILURE == ret) {
return FAILURE;
}
if (pphar) {
*pphar = phar;
}
phar->is_data = is_data;
if (phar->is_tar) {
return ret;
}
if (phar->is_brandnew) {
phar->is_tar = 1;
phar->is_zip = 0;
phar->internal_file_start = 0;
return SUCCESS;
}
/* we've reached here - the phar exists and is a regular phar */
if (error) {
spprintf(error, 4096, "phar tar error: \"%s\" already exists as a regular phar and must be deleted from disk prior to creating as a tar-based phar", fname);
}
return FAILURE;
}
/* }}} */
static int phar_tar_process_metadata(phar_entry_info *entry, php_stream *fp TSRMLS_DC) /* {{{ */
{
char *metadata;
size_t save = php_stream_tell(fp), read;
phar_entry_info *mentry;
metadata = (char *) safe_emalloc(1, entry->uncompressed_filesize, 1);
read = php_stream_read(fp, metadata, entry->uncompressed_filesize);
if (read != entry->uncompressed_filesize) {
efree(metadata);
php_stream_seek(fp, save, SEEK_SET);
return FAILURE;
}
if (phar_parse_metadata(&metadata, &entry->metadata, entry->uncompressed_filesize TSRMLS_CC) == FAILURE) {
/* if not valid serialized data, it is a regular string */
efree(metadata);
php_stream_seek(fp, save, SEEK_SET);
return FAILURE;
}
if (entry->filename_len == sizeof(".phar/.metadata.bin")-1 && !memcmp(entry->filename, ".phar/.metadata.bin", sizeof(".phar/.metadata.bin")-1)) {
entry->phar->metadata = entry->metadata;
ZVAL_UNDEF(&entry->metadata);
} else if (entry->filename_len >= sizeof(".phar/.metadata/") + sizeof("/.metadata.bin") - 1 && NULL != (mentry = zend_hash_str_find_ptr(&(entry->phar->manifest), entry->filename + sizeof(".phar/.metadata/") - 1, entry->filename_len - (sizeof("/.metadata.bin") - 1 + sizeof(".phar/.metadata/") - 1)))) {
/* transfer this metadata to the entry it refers */
mentry->metadata = entry->metadata;
ZVAL_UNDEF(&entry->metadata);
}
efree(metadata);
php_stream_seek(fp, save, SEEK_SET);
return SUCCESS;
}
/* }}} */
int phar_parse_tarfile(php_stream* fp, char *fname, int fname_len, char *alias, int alias_len, phar_archive_data** pphar, int is_data, php_uint32 compression, char **error TSRMLS_DC) /* {{{ */
{
char buf[512], *actual_alias = NULL, *p;
phar_entry_info entry = {0};
size_t pos = 0, read, totalsize;
tar_header *hdr;
php_uint32 sum1, sum2, size, old;
phar_archive_data *myphar, *actual;
int last_was_longlink = 0;
if (error) {
*error = NULL;
}
php_stream_seek(fp, 0, SEEK_END);
totalsize = php_stream_tell(fp);
php_stream_seek(fp, 0, SEEK_SET);
read = php_stream_read(fp, buf, sizeof(buf));
if (read != sizeof(buf)) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is not a tar file or is truncated", fname);
}
php_stream_close(fp);
return FAILURE;
}
hdr = (tar_header*)buf;
old = (memcmp(hdr->magic, "ustar", sizeof("ustar")-1) != 0);
myphar = (phar_archive_data *) pecalloc(1, sizeof(phar_archive_data), PHAR_G(persist));
myphar->is_persistent = PHAR_G(persist);
/* estimate number of entries, can't be certain with tar files */
zend_hash_init(&myphar->manifest, 2 + (totalsize >> 12),
zend_get_hash_value, destroy_phar_manifest_entry, (zend_bool)myphar->is_persistent);
zend_hash_init(&myphar->mounted_dirs, 5,
zend_get_hash_value, NULL, (zend_bool)myphar->is_persistent);
zend_hash_init(&myphar->virtual_dirs, 4 + (totalsize >> 11),
zend_get_hash_value, NULL, (zend_bool)myphar->is_persistent);
myphar->is_tar = 1;
/* remember whether this entire phar was compressed with gz/bzip2 */
myphar->flags = compression;
entry.is_tar = 1;
entry.is_crc_checked = 1;
entry.phar = myphar;
pos += sizeof(buf);
do {
phar_entry_info *newentry;
pos = php_stream_tell(fp);
hdr = (tar_header*) buf;
sum1 = phar_tar_number(hdr->checksum, sizeof(hdr->checksum));
if (sum1 == 0 && phar_tar_checksum(buf, sizeof(buf)) == 0) {
break;
}
memset(hdr->checksum, ' ', sizeof(hdr->checksum));
sum2 = phar_tar_checksum(buf, old?sizeof(old_tar_header):sizeof(tar_header));
size = entry.uncompressed_filesize = entry.compressed_filesize =
phar_tar_number(hdr->size, sizeof(hdr->size));
if (((!old && hdr->prefix[0] == 0) || old) && strlen(hdr->name) == sizeof(".phar/signature.bin")-1 && !strncmp(hdr->name, ".phar/signature.bin", sizeof(".phar/signature.bin")-1)) {
zend_off_t curloc;
if (size > 511) {
if (error) {
spprintf(error, 4096, "phar error: tar-based phar \"%s\" has signature that is larger than 511 bytes, cannot process", fname);
}
bail:
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
curloc = php_stream_tell(fp);
read = php_stream_read(fp, buf, size);
if (read != size) {
if (error) {
spprintf(error, 4096, "phar error: tar-based phar \"%s\" signature cannot be read", fname);
}
goto bail;
}
#ifdef WORDS_BIGENDIAN
# define PHAR_GET_32(buffer) \
(((((unsigned char*)(buffer))[3]) << 24) \
| ((((unsigned char*)(buffer))[2]) << 16) \
| ((((unsigned char*)(buffer))[1]) << 8) \
| (((unsigned char*)(buffer))[0]))
#else
# define PHAR_GET_32(buffer) (php_uint32) *(buffer)
#endif
myphar->sig_flags = PHAR_GET_32(buf);
if (FAILURE == phar_verify_signature(fp, php_stream_tell(fp) - size - 512, myphar->sig_flags, buf + 8, size - 8, fname, &myphar->signature, &myphar->sig_len, error TSRMLS_CC)) {
if (error) {
char *save = *error;
spprintf(error, 4096, "phar error: tar-based phar \"%s\" signature cannot be verified: %s", fname, save);
efree(save);
}
goto bail;
}
php_stream_seek(fp, curloc + 512, SEEK_SET);
/* signature checked out, let's ensure this is the last file in the phar */
if (((hdr->typeflag == '\0') || (hdr->typeflag == TAR_FILE)) && size > 0) {
/* this is not good enough - seek succeeds even on truncated tars */
php_stream_seek(fp, 512, SEEK_CUR);
if ((uint)php_stream_tell(fp) > totalsize) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (truncated)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
}
read = php_stream_read(fp, buf, sizeof(buf));
if (read != sizeof(buf)) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (truncated)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
hdr = (tar_header*) buf;
sum1 = phar_tar_number(hdr->checksum, sizeof(hdr->checksum));
if (sum1 == 0 && phar_tar_checksum(buf, sizeof(buf)) == 0) {
break;
}
if (error) {
spprintf(error, 4096, "phar error: \"%s\" has entries after signature, invalid phar", fname);
}
goto bail;
}
if (!last_was_longlink && hdr->typeflag == 'L') {
last_was_longlink = 1;
/* support the ././@LongLink system for storing long filenames */
entry.filename_len = entry.uncompressed_filesize;
/* Check for overflow - bug 61065 */
if (entry.filename_len == UINT_MAX) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (invalid entry size)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
entry.filename = pemalloc(entry.filename_len+1, myphar->is_persistent);
read = php_stream_read(fp, entry.filename, entry.filename_len);
if (read != entry.filename_len) {
efree(entry.filename);
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (truncated)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
entry.filename[entry.filename_len] = '\0';
/* skip blank stuff */
size = ((size+511)&~511) - size;
/* this is not good enough - seek succeeds even on truncated tars */
php_stream_seek(fp, size, SEEK_CUR);
if ((uint)php_stream_tell(fp) > totalsize) {
efree(entry.filename);
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (truncated)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
read = php_stream_read(fp, buf, sizeof(buf));
if (read != sizeof(buf)) {
efree(entry.filename);
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (truncated)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
continue;
} else if (!last_was_longlink && !old && hdr->prefix[0] != 0) {
char name[256];
int i, j;
for (i = 0; i < 155; i++) {
name[i] = hdr->prefix[i];
if (name[i] == '\0') {
break;
}
}
name[i++] = '/';
for (j = 0; j < 100; j++) {
name[i+j] = hdr->name[j];
if (name[i+j] == '\0') {
break;
}
}
entry.filename_len = i+j;
if (name[entry.filename_len - 1] == '/') {
/* some tar programs store directories with trailing slash */
entry.filename_len--;
}
entry.filename = pestrndup(name, entry.filename_len, myphar->is_persistent);
} else if (!last_was_longlink) {
int i;
/* calculate strlen, which can be no longer than 100 */
for (i = 0; i < 100; i++) {
if (hdr->name[i] == '\0') {
break;
}
}
entry.filename_len = i;
entry.filename = pestrndup(hdr->name, i, myphar->is_persistent);
if (entry.filename[entry.filename_len - 1] == '/') {
/* some tar programs store directories with trailing slash */
entry.filename[entry.filename_len - 1] = '\0';
entry.filename_len--;
}
}
last_was_longlink = 0;
phar_add_virtual_dirs(myphar, entry.filename, entry.filename_len TSRMLS_CC);
if (sum1 != sum2) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (checksum mismatch of file \"%s\")", fname, entry.filename);
}
pefree(entry.filename, myphar->is_persistent);
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
entry.tar_type = ((old & (hdr->typeflag == '\0')) ? TAR_FILE : hdr->typeflag);
entry.offset = entry.offset_abs = pos; /* header_offset unused in tar */
entry.fp_type = PHAR_FP;
entry.flags = phar_tar_number(hdr->mode, sizeof(hdr->mode)) & PHAR_ENT_PERM_MASK;
entry.timestamp = phar_tar_number(hdr->mtime, sizeof(hdr->mtime));
entry.is_persistent = myphar->is_persistent;
#ifndef S_ISDIR
#define S_ISDIR(mode) (((mode)&S_IFMT) == S_IFDIR)
#endif
if (old && entry.tar_type == TAR_FILE && S_ISDIR(entry.flags)) {
entry.tar_type = TAR_DIR;
}
if (entry.tar_type == TAR_DIR) {
entry.is_dir = 1;
} else {
entry.is_dir = 0;
}
entry.link = NULL;
if (entry.tar_type == TAR_LINK) {
if (!zend_hash_str_exists(&myphar->manifest, hdr->linkname, strlen(hdr->linkname))) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file - hard link to non-existent file \"%s\"", fname, hdr->linkname);
}
pefree(entry.filename, entry.is_persistent);
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
entry.link = estrdup(hdr->linkname);
} else if (entry.tar_type == TAR_SYMLINK) {
entry.link = estrdup(hdr->linkname);
}
phar_set_inode(&entry TSRMLS_CC);
newentry = zend_hash_str_add_mem(&myphar->manifest, entry.filename, entry.filename_len, (void*)&entry, sizeof(phar_entry_info));
if (entry.is_persistent) {
++entry.manifest_pos;
}
if (entry.filename_len >= sizeof(".phar/.metadata")-1 && !memcmp(entry.filename, ".phar/.metadata", sizeof(".phar/.metadata")-1)) {
if (FAILURE == phar_tar_process_metadata(newentry, fp TSRMLS_CC)) {
if (error) {
spprintf(error, 4096, "phar error: tar-based phar \"%s\" has invalid metadata in magic file \"%s\"", fname, entry.filename);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
}
if (!actual_alias && entry.filename_len == sizeof(".phar/alias.txt")-1 && !strncmp(entry.filename, ".phar/alias.txt", sizeof(".phar/alias.txt")-1)) {
/* found explicit alias */
if (size > 511) {
if (error) {
spprintf(error, 4096, "phar error: tar-based phar \"%s\" has alias that is larger than 511 bytes, cannot process", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
read = php_stream_read(fp, buf, size);
if (read == size) {
buf[size] = '\0';
if (!phar_validate_alias(buf, size)) {
if (size > 50) {
buf[50] = '.';
buf[51] = '.';
buf[52] = '.';
buf[53] = '\0';
}
if (error) {
spprintf(error, 4096, "phar error: invalid alias \"%s\" in tar-based phar \"%s\"", buf, fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
actual_alias = pestrndup(buf, size, myphar->is_persistent);
myphar->alias = actual_alias;
myphar->alias_len = size;
php_stream_seek(fp, pos, SEEK_SET);
} else {
if (error) {
spprintf(error, 4096, "phar error: Unable to read alias from tar-based phar \"%s\"", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
}
size = (size+511)&~511;
if (((hdr->typeflag == '\0') || (hdr->typeflag == TAR_FILE)) && size > 0) {
/* this is not good enough - seek succeeds even on truncated tars */
php_stream_seek(fp, size, SEEK_CUR);
if ((uint)php_stream_tell(fp) > totalsize) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (truncated)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
}
read = php_stream_read(fp, buf, sizeof(buf));
if (read != sizeof(buf)) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (truncated)", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
} while (read != 0);
if (zend_hash_str_exists(&(myphar->manifest), ".phar/stub.php", sizeof(".phar/stub.php")-1)) {
myphar->is_data = 0;
} else {
myphar->is_data = 1;
}
/* ensure signature set */
if (!myphar->is_data && PHAR_G(require_hash) && !myphar->signature) {
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
if (error) {
spprintf(error, 0, "tar-based phar \"%s\" does not have a signature", fname);
}
return FAILURE;
}
myphar->fname = pestrndup(fname, fname_len, myphar->is_persistent);
#ifdef PHP_WIN32
phar_unixify_path_separators(myphar->fname, fname_len);
#endif
myphar->fname_len = fname_len;
myphar->fp = fp;
p = strrchr(myphar->fname, '/');
if (p) {
myphar->ext = memchr(p, '.', (myphar->fname + fname_len) - p);
if (myphar->ext == p) {
myphar->ext = memchr(p + 1, '.', (myphar->fname + fname_len) - p - 1);
}
if (myphar->ext) {
myphar->ext_len = (myphar->fname + fname_len) - myphar->ext;
}
}
phar_request_initialize(TSRMLS_C);
if (NULL == (actual = zend_hash_str_add_ptr(&(PHAR_GLOBALS->phar_fname_map), myphar->fname, fname_len, myphar))) {
if (error) {
spprintf(error, 4096, "phar error: Unable to add tar-based phar \"%s\" to phar registry", fname);
}
php_stream_close(fp);
phar_destroy_phar_data(myphar TSRMLS_CC);
return FAILURE;
}
myphar = actual;
if (actual_alias) {
phar_archive_data *fd_ptr;
myphar->is_temporary_alias = 0;
if (NULL != (fd_ptr = zend_hash_str_find_ptr(&(PHAR_GLOBALS->phar_alias_map), actual_alias, myphar->alias_len))) {
if (SUCCESS != phar_free_alias(fd_ptr, actual_alias, myphar->alias_len TSRMLS_CC)) {
if (error) {
spprintf(error, 4096, "phar error: Unable to add tar-based phar \"%s\", alias is already in use", fname);
}
zend_hash_str_del(&(PHAR_GLOBALS->phar_fname_map), myphar->fname, fname_len);
return FAILURE;
}
}
zend_hash_str_add_ptr(&(PHAR_GLOBALS->phar_alias_map), actual_alias, myphar->alias_len, myphar);
} else {
phar_archive_data *fd_ptr;
if (alias_len) {
if (NULL != (fd_ptr = zend_hash_str_find_ptr(&(PHAR_GLOBALS->phar_alias_map), alias, alias_len))) {
if (SUCCESS != phar_free_alias(fd_ptr, alias, alias_len TSRMLS_CC)) {
if (error) {
spprintf(error, 4096, "phar error: Unable to add tar-based phar \"%s\", alias is already in use", fname);
}
zend_hash_str_del(&(PHAR_GLOBALS->phar_fname_map), myphar->fname, fname_len);
return FAILURE;
}
}
zend_hash_str_add_ptr(&(PHAR_GLOBALS->phar_alias_map), alias, alias_len, myphar);
myphar->alias = pestrndup(alias, alias_len, myphar->is_persistent);
myphar->alias_len = alias_len;
} else {
myphar->alias = pestrndup(myphar->fname, fname_len, myphar->is_persistent);
myphar->alias_len = fname_len;
}
myphar->is_temporary_alias = 1;
}
if (pphar) {
*pphar = myphar;
}
return SUCCESS;
}
/* }}} */
struct _phar_pass_tar_info {
php_stream *old;
php_stream *new;
int free_fp;
int free_ufp;
char **error;
};
static int phar_tar_writeheaders_int(phar_entry_info *entry, void *argument TSRMLS_DC) /* {{{ */
{
tar_header header;
size_t pos;
struct _phar_pass_tar_info *fp = (struct _phar_pass_tar_info *)argument;
char padding[512];
if (entry->is_mounted) {
return ZEND_HASH_APPLY_KEEP;
}
if (entry->is_deleted) {
if (entry->fp_refcount <= 0) {
return ZEND_HASH_APPLY_REMOVE;
} else {
/* we can't delete this in-memory until it is closed */
return ZEND_HASH_APPLY_KEEP;
}
}
phar_add_virtual_dirs(entry->phar, entry->filename, entry->filename_len TSRMLS_CC);
memset((char *) &header, 0, sizeof(header));
if (entry->filename_len > 100) {
char *boundary;
if (entry->filename_len > 256) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, filename \"%s\" is too long for tar file format", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
boundary = entry->filename + entry->filename_len - 101;
while (*boundary && *boundary != '/') {
++boundary;
}
if (!*boundary || ((boundary - entry->filename) > 155)) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, filename \"%s\" is too long for tar file format", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
memcpy(header.prefix, entry->filename, boundary - entry->filename);
memcpy(header.name, boundary + 1, entry->filename_len - (boundary + 1 - entry->filename));
} else {
memcpy(header.name, entry->filename, entry->filename_len);
}
phar_tar_octal(header.mode, entry->flags & PHAR_ENT_PERM_MASK, sizeof(header.mode)-1);
if (FAILURE == phar_tar_octal(header.size, entry->uncompressed_filesize, sizeof(header.size)-1)) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, filename \"%s\" is too large for tar file format", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
if (FAILURE == phar_tar_octal(header.mtime, entry->timestamp, sizeof(header.mtime)-1)) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, file modification time of file \"%s\" is too large for tar file format", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
/* calc checksum */
header.typeflag = entry->tar_type;
if (entry->link) {
strncpy(header.linkname, entry->link, strlen(entry->link));
}
strncpy(header.magic, "ustar", sizeof("ustar")-1);
strncpy(header.version, "00", sizeof("00")-1);
strncpy(header.checksum, " ", sizeof(" ")-1);
entry->crc32 = phar_tar_checksum((char *)&header, sizeof(header));
if (FAILURE == phar_tar_octal(header.checksum, entry->crc32, sizeof(header.checksum)-1)) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, checksum of file \"%s\" is too large for tar file format", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
/* write header */
entry->header_offset = php_stream_tell(fp->new);
if (sizeof(header) != php_stream_write(fp->new, (char *) &header, sizeof(header))) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, header for file \"%s\" could not be written", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
pos = php_stream_tell(fp->new); /* save start of file within tar */
/* write contents */
if (entry->uncompressed_filesize) {
if (FAILURE == phar_open_entry_fp(entry, fp->error, 0 TSRMLS_CC)) {
return ZEND_HASH_APPLY_STOP;
}
if (-1 == phar_seek_efp(entry, 0, SEEK_SET, 0, 0 TSRMLS_CC)) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, contents of file \"%s\" could not be written, seek failed", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
if (SUCCESS != php_stream_copy_to_stream_ex(phar_get_efp(entry, 0 TSRMLS_CC), fp->new, entry->uncompressed_filesize, NULL)) {
if (fp->error) {
spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, contents of file \"%s\" could not be written", entry->phar->fname, entry->filename);
}
return ZEND_HASH_APPLY_STOP;
}
memset(padding, 0, 512);
php_stream_write(fp->new, padding, ((entry->uncompressed_filesize +511)&~511) - entry->uncompressed_filesize);
}
if (!entry->is_modified && entry->fp_refcount) {
/* open file pointers refer to this fp, do not free the stream */
switch (entry->fp_type) {
case PHAR_FP:
fp->free_fp = 0;
break;
case PHAR_UFP:
fp->free_ufp = 0;
default:
break;
}
}
entry->is_modified = 0;
if (entry->fp_type == PHAR_MOD && entry->fp != entry->phar->fp && entry->fp != entry->phar->ufp) {
if (!entry->fp_refcount) {
php_stream_close(entry->fp);
}
entry->fp = NULL;
}
entry->fp_type = PHAR_FP;
/* note new location within tar */
entry->offset = entry->offset_abs = pos;
return ZEND_HASH_APPLY_KEEP;
}
/* }}} */
static int phar_tar_writeheaders(zval *zv, void *argument TSRMLS_DC) /* {{{ */
{
return phar_tar_writeheaders_int(Z_PTR_P(zv), argument TSRMLS_CC);
}
/* }}} */
int phar_tar_setmetadata(zval *metadata, phar_entry_info *entry, char **error TSRMLS_DC) /* {{{ */
{
php_serialize_data_t metadata_hash;
if (entry->metadata_str.s) {
smart_str_free(&entry->metadata_str);
}
entry->metadata_str.s = NULL;
PHP_VAR_SERIALIZE_INIT(metadata_hash);
php_var_serialize(&entry->metadata_str, metadata, &metadata_hash TSRMLS_CC);
PHP_VAR_SERIALIZE_DESTROY(metadata_hash);
entry->uncompressed_filesize = entry->compressed_filesize = entry->metadata_str.s ? entry->metadata_str.s->len : 0;
if (entry->fp && entry->fp_type == PHAR_MOD) {
php_stream_close(entry->fp);
}
entry->fp_type = PHAR_MOD;
entry->is_modified = 1;
entry->fp = php_stream_fopen_tmpfile();
entry->offset = entry->offset_abs = 0;
if (entry->fp == NULL) {
spprintf(error, 0, "phar error: unable to create temporary file");
return -1;
}
if (entry->metadata_str.s->len != php_stream_write(entry->fp, entry->metadata_str.s->val, entry->metadata_str.s->len)) {
spprintf(error, 0, "phar tar error: unable to write metadata to magic metadata file \"%s\"", entry->filename);
zend_hash_str_del(&(entry->phar->manifest), entry->filename, entry->filename_len);
return ZEND_HASH_APPLY_STOP;
}
return ZEND_HASH_APPLY_KEEP;
}
/* }}} */
static int phar_tar_setupmetadata(zval *zv, void *argument TSRMLS_DC) /* {{{ */
{
int lookfor_len;
struct _phar_pass_tar_info *i = (struct _phar_pass_tar_info *)argument;
char *lookfor, **error = i->error;
phar_entry_info *entry = (phar_entry_info *)Z_PTR_P(zv), *metadata, newentry = {0};
if (entry->filename_len >= sizeof(".phar/.metadata") && !memcmp(entry->filename, ".phar/.metadata", sizeof(".phar/.metadata")-1)) {
if (entry->filename_len == sizeof(".phar/.metadata.bin")-1 && !memcmp(entry->filename, ".phar/.metadata.bin", sizeof(".phar/.metadata.bin")-1)) {
return phar_tar_setmetadata(&entry->phar->metadata, entry, error TSRMLS_CC);
}
/* search for the file this metadata entry references */
if (entry->filename_len >= sizeof(".phar/.metadata/") + sizeof("/.metadata.bin") - 1 && !zend_hash_str_exists(&(entry->phar->manifest), entry->filename + sizeof(".phar/.metadata/") - 1, entry->filename_len - (sizeof("/.metadata.bin") - 1 + sizeof(".phar/.metadata/") - 1))) {
/* this is orphaned metadata, erase it */
return ZEND_HASH_APPLY_REMOVE;
}
/* we can keep this entry, the file that refers to it exists */
return ZEND_HASH_APPLY_KEEP;
}
if (!entry->is_modified) {
return ZEND_HASH_APPLY_KEEP;
}
/* now we are dealing with regular files, so look for metadata */
lookfor_len = spprintf(&lookfor, 0, ".phar/.metadata/%s/.metadata.bin", entry->filename);
if (Z_TYPE(entry->metadata) == IS_UNDEF) {
zend_hash_str_del(&(entry->phar->manifest), lookfor, lookfor_len);
efree(lookfor);
return ZEND_HASH_APPLY_KEEP;
}
if (NULL != (metadata = zend_hash_str_find_ptr(&(entry->phar->manifest), lookfor, lookfor_len))) {
int ret;
ret = phar_tar_setmetadata(&entry->metadata, metadata, error TSRMLS_CC);
efree(lookfor);
return ret;
}
newentry.filename = lookfor;
newentry.filename_len = lookfor_len;
newentry.phar = entry->phar;
newentry.tar_type = TAR_FILE;
newentry.is_tar = 1;
if (NULL == (metadata = zend_hash_str_add_mem(&(entry->phar->manifest), lookfor, lookfor_len, (void *)&newentry, sizeof(phar_entry_info)))) {
efree(lookfor);
spprintf(error, 0, "phar tar error: unable to add magic metadata file to manifest for file \"%s\"", entry->filename);
return ZEND_HASH_APPLY_STOP;
}
return phar_tar_setmetadata(&entry->metadata, metadata, error TSRMLS_CC);
}
/* }}} */
int phar_tar_flush(phar_archive_data *phar, char *user_stub, zend_long len, int defaultstub, char **error TSRMLS_DC) /* {{{ */
{
phar_entry_info entry = {0};
static const char newstub[] = "<?php // tar-based phar archive stub file\n__HALT_COMPILER();";
php_stream *oldfile, *newfile, *stubfile;
int closeoldfile, free_user_stub, signature_length;
struct _phar_pass_tar_info pass;
char *buf, *signature, *tmp, sigbuf[8];
char halt_stub[] = "__HALT_COMPILER();";
entry.flags = PHAR_ENT_PERM_DEF_FILE;
entry.timestamp = time(NULL);
entry.is_modified = 1;
entry.is_crc_checked = 1;
entry.is_tar = 1;
entry.tar_type = '0';
entry.phar = phar;
entry.fp_type = PHAR_MOD;
if (phar->is_persistent) {
if (error) {
spprintf(error, 0, "internal error: attempt to flush cached tar-based phar \"%s\"", phar->fname);
}
return EOF;
}
if (phar->is_data) {
goto nostub;
}
/* set alias */
if (!phar->is_temporary_alias && phar->alias_len) {
entry.filename = estrndup(".phar/alias.txt", sizeof(".phar/alias.txt")-1);
entry.filename_len = sizeof(".phar/alias.txt")-1;
entry.fp = php_stream_fopen_tmpfile();
if (entry.fp == NULL) {
spprintf(error, 0, "phar error: unable to create temporary file");
return -1;
}
if (phar->alias_len != (int)php_stream_write(entry.fp, phar->alias, phar->alias_len)) {
if (error) {
spprintf(error, 0, "unable to set alias in tar-based phar \"%s\"", phar->fname);
}
return EOF;
}
entry.uncompressed_filesize = phar->alias_len;
if (NULL == zend_hash_str_update_mem(&phar->manifest, entry.filename, entry.filename_len, (void*)&entry, sizeof(phar_entry_info))) {
if (error) {
spprintf(error, 0, "unable to set alias in tar-based phar \"%s\"", phar->fname);
}
return EOF;
}
} else {
zend_hash_str_del(&phar->manifest, ".phar/alias.txt", sizeof(".phar/alias.txt")-1);
}
/* set stub */
if (user_stub && !defaultstub) {
char *pos;
if (len < 0) {
/* resource passed in */
if (!(php_stream_from_zval_no_verify(stubfile, (zval *)user_stub))) {
if (error) {
spprintf(error, 0, "unable to access resource to copy stub to new tar-based phar \"%s\"", phar->fname);
}
return EOF;
}
if (len == -1) {
len = PHP_STREAM_COPY_ALL;
} else {
len = -len;
}
user_stub = 0;
// TODO: refactor to avoid reallocation ???
//??? len = php_stream_copy_to_mem(stubfile, &user_stub, len, 0)
{
zend_string *str = php_stream_copy_to_mem(stubfile, len, 0);
if (str) {
len = str->len;
user_stub = estrndup(str->val, str->len);
zend_string_release(str);
} else {
user_stub = NULL;
len = 0;
}
}
if (!len || !user_stub) {
if (error) {
spprintf(error, 0, "unable to read resource to copy stub to new tar-based phar \"%s\"", phar->fname);
}
return EOF;
}
free_user_stub = 1;
} else {
free_user_stub = 0;
}
tmp = estrndup(user_stub, len);
if ((pos = php_stristr(tmp, halt_stub, len, sizeof(halt_stub) - 1)) == NULL) {
efree(tmp);
if (error) {
spprintf(error, 0, "illegal stub for tar-based phar \"%s\"", phar->fname);
}
if (free_user_stub) {
efree(user_stub);
}
return EOF;
}
pos = user_stub + (pos - tmp);
efree(tmp);
len = pos - user_stub + 18;
entry.fp = php_stream_fopen_tmpfile();
if (entry.fp == NULL) {
spprintf(error, 0, "phar error: unable to create temporary file");
return EOF;
}
entry.uncompressed_filesize = len + 5;
if ((size_t)len != php_stream_write(entry.fp, user_stub, len)
|| 5 != php_stream_write(entry.fp, " ?>\r\n", 5)) {
if (error) {
spprintf(error, 0, "unable to create stub from string in new tar-based phar \"%s\"", phar->fname);
}
if (free_user_stub) {
efree(user_stub);
}
php_stream_close(entry.fp);
return EOF;
}
entry.filename = estrndup(".phar/stub.php", sizeof(".phar/stub.php")-1);
entry.filename_len = sizeof(".phar/stub.php")-1;
zend_hash_str_update_mem(&phar->manifest, entry.filename, entry.filename_len, (void*)&entry, sizeof(phar_entry_info));
if (free_user_stub) {
efree(user_stub);
}
} else {
/* Either this is a brand new phar (add the stub), or the default stub is required (overwrite the stub) */
entry.fp = php_stream_fopen_tmpfile();
if (entry.fp == NULL) {
spprintf(error, 0, "phar error: unable to create temporary file");
return EOF;
}
if (sizeof(newstub)-1 != php_stream_write(entry.fp, newstub, sizeof(newstub)-1)) {
php_stream_close(entry.fp);
if (error) {
spprintf(error, 0, "unable to %s stub in%star-based phar \"%s\", failed", user_stub ? "overwrite" : "create", user_stub ? " " : " new ", phar->fname);
}
return EOF;
}
entry.uncompressed_filesize = entry.compressed_filesize = sizeof(newstub) - 1;
entry.filename = estrndup(".phar/stub.php", sizeof(".phar/stub.php")-1);
entry.filename_len = sizeof(".phar/stub.php")-1;
if (!defaultstub) {
if (!zend_hash_str_exists(&phar->manifest, ".phar/stub.php", sizeof(".phar/stub.php")-1)) {
if (NULL == zend_hash_str_add_mem(&phar->manifest, entry.filename, entry.filename_len, (void*)&entry, sizeof(phar_entry_info))) {
php_stream_close(entry.fp);
efree(entry.filename);
if (error) {
spprintf(error, 0, "unable to create stub in tar-based phar \"%s\"", phar->fname);
}
return EOF;
}
} else {
php_stream_close(entry.fp);
efree(entry.filename);
}
} else {
if (NULL == zend_hash_str_update_mem(&phar->manifest, entry.filename, entry.filename_len, (void*)&entry, sizeof(phar_entry_info))) {
php_stream_close(entry.fp);
efree(entry.filename);
if (error) {
spprintf(error, 0, "unable to overwrite stub in tar-based phar \"%s\"", phar->fname);
}
return EOF;
}
}
}
nostub:
if (phar->fp && !phar->is_brandnew) {
oldfile = phar->fp;
closeoldfile = 0;
php_stream_rewind(oldfile);
} else {
oldfile = php_stream_open_wrapper(phar->fname, "rb", 0, NULL);
closeoldfile = oldfile != NULL;
}
newfile = php_stream_fopen_tmpfile();
if (!newfile) {
if (error) {
spprintf(error, 0, "unable to create temporary file");
}
if (closeoldfile) {
php_stream_close(oldfile);
}
return EOF;
}
pass.old = oldfile;
pass.new = newfile;
pass.error = error;
pass.free_fp = 1;
pass.free_ufp = 1;
if (Z_TYPE(phar->metadata) != IS_UNDEF) {
phar_entry_info *mentry;
if (NULL != (mentry = zend_hash_str_find_ptr(&(phar->manifest), ".phar/.metadata.bin", sizeof(".phar/.metadata.bin")-1))) {
if (ZEND_HASH_APPLY_KEEP != phar_tar_setmetadata(&phar->metadata, mentry, error TSRMLS_CC)) {
if (closeoldfile) {
php_stream_close(oldfile);
}
return EOF;
}
} else {
phar_entry_info newentry = {0};
newentry.filename = estrndup(".phar/.metadata.bin", sizeof(".phar/.metadata.bin")-1);
newentry.filename_len = sizeof(".phar/.metadata.bin")-1;
newentry.phar = phar;
newentry.tar_type = TAR_FILE;
newentry.is_tar = 1;
if (NULL == (mentry = zend_hash_str_add_mem(&(phar->manifest), ".phar/.metadata.bin", sizeof(".phar/.metadata.bin")-1, (void *)&newentry, sizeof(phar_entry_info)))) {
spprintf(error, 0, "phar tar error: unable to add magic metadata file to manifest for phar archive \"%s\"", phar->fname);
if (closeoldfile) {
php_stream_close(oldfile);
}
return EOF;
}
if (ZEND_HASH_APPLY_KEEP != phar_tar_setmetadata(&phar->metadata, mentry, error TSRMLS_CC)) {
zend_hash_str_del(&(phar->manifest), ".phar/.metadata.bin", sizeof(".phar/.metadata.bin")-1);
if (closeoldfile) {
php_stream_close(oldfile);
}
return EOF;
}
}
}
zend_hash_apply_with_argument(&phar->manifest, phar_tar_setupmetadata, (void *) &pass TSRMLS_CC);
if (error && *error) {
if (closeoldfile) {
php_stream_close(oldfile);
}
/* on error in the hash iterator above, error is set */
php_stream_close(newfile);
return EOF;
}
zend_hash_apply_with_argument(&phar->manifest, phar_tar_writeheaders, (void *) &pass TSRMLS_CC);
/* add signature for executable tars or tars explicitly set with setSignatureAlgorithm */
if (!phar->is_data || phar->sig_flags) {
if (FAILURE == phar_create_signature(phar, newfile, &signature, &signature_length, error TSRMLS_CC)) {
if (error) {
char *save = *error;
spprintf(error, 0, "phar error: unable to write signature to tar-based phar: %s", save);
efree(save);
}
if (closeoldfile) {
php_stream_close(oldfile);
}
php_stream_close(newfile);
return EOF;
}
entry.filename = ".phar/signature.bin";
entry.filename_len = sizeof(".phar/signature.bin")-1;
entry.fp = php_stream_fopen_tmpfile();
if (entry.fp == NULL) {
spprintf(error, 0, "phar error: unable to create temporary file");
return EOF;
}
#ifdef WORDS_BIGENDIAN
# define PHAR_SET_32(var, buffer) \
*(php_uint32 *)(var) = (((((unsigned char*)&(buffer))[3]) << 24) \
| ((((unsigned char*)&(buffer))[2]) << 16) \
| ((((unsigned char*)&(buffer))[1]) << 8) \
| (((unsigned char*)&(buffer))[0]))
#else
# define PHAR_SET_32(var, buffer) *(php_uint32 *)(var) = (php_uint32) (buffer)
#endif
PHAR_SET_32(sigbuf, phar->sig_flags);
PHAR_SET_32(sigbuf + 4, signature_length);
if (8 != (int)php_stream_write(entry.fp, sigbuf, 8) || signature_length != (int)php_stream_write(entry.fp, signature, signature_length)) {
efree(signature);
if (error) {
spprintf(error, 0, "phar error: unable to write signature to tar-based phar %s", phar->fname);
}
if (closeoldfile) {
php_stream_close(oldfile);
}
php_stream_close(newfile);
return EOF;
}
efree(signature);
entry.uncompressed_filesize = entry.compressed_filesize = signature_length + 8;
/* throw out return value and write the signature */
entry.filename_len = phar_tar_writeheaders_int(&entry, (void *)&pass TSRMLS_CC);
if (error && *error) {
if (closeoldfile) {
php_stream_close(oldfile);
}
/* error is set by writeheaders */
php_stream_close(newfile);
return EOF;
}
} /* signature */
/* add final zero blocks */
buf = (char *) ecalloc(1024, 1);
php_stream_write(newfile, buf, 1024);
efree(buf);
if (closeoldfile) {
php_stream_close(oldfile);
}
/* on error in the hash iterator above, error is set */
if (error && *error) {
php_stream_close(newfile);
return EOF;
}
if (phar->fp && pass.free_fp) {
php_stream_close(phar->fp);
}
if (phar->ufp) {
if (pass.free_ufp) {
php_stream_close(phar->ufp);
}
phar->ufp = NULL;
}
phar->is_brandnew = 0;
php_stream_rewind(newfile);
if (phar->donotflush) {
/* deferred flush */
phar->fp = newfile;
} else {
phar->fp = php_stream_open_wrapper(phar->fname, "w+b", IGNORE_URL|STREAM_MUST_SEEK|REPORT_ERRORS, NULL);
if (!phar->fp) {
phar->fp = newfile;
if (error) {
spprintf(error, 0, "unable to open new phar \"%s\" for writing", phar->fname);
}
return EOF;
}
if (phar->flags & PHAR_FILE_COMPRESSED_GZ) {
php_stream_filter *filter;
/* to properly compress, we have to tell zlib to add a zlib header */
zval filterparams;
array_init(&filterparams);
/* this is defined in zlib's zconf.h */
#ifndef MAX_WBITS
#define MAX_WBITS 15
#endif
add_assoc_long(&filterparams, "window", MAX_WBITS + 16);
filter = php_stream_filter_create("zlib.deflate", &filterparams, php_stream_is_persistent(phar->fp) TSRMLS_CC);
zval_dtor(&filterparams);
if (!filter) {
/* copy contents uncompressed rather than lose them */
php_stream_copy_to_stream_ex(newfile, phar->fp, PHP_STREAM_COPY_ALL, NULL);
php_stream_close(newfile);
if (error) {
spprintf(error, 4096, "unable to compress all contents of phar \"%s\" using zlib, PHP versions older than 5.2.6 have a buggy zlib", phar->fname);
}
return EOF;
}
php_stream_filter_append(&phar->fp->writefilters, filter);
php_stream_copy_to_stream_ex(newfile, phar->fp, PHP_STREAM_COPY_ALL, NULL);
php_stream_filter_flush(filter, 1);
php_stream_filter_remove(filter, 1 TSRMLS_CC);
php_stream_close(phar->fp);
/* use the temp stream as our base */
phar->fp = newfile;
} else if (phar->flags & PHAR_FILE_COMPRESSED_BZ2) {
php_stream_filter *filter;
filter = php_stream_filter_create("bzip2.compress", NULL, php_stream_is_persistent(phar->fp) TSRMLS_CC);
php_stream_filter_append(&phar->fp->writefilters, filter);
php_stream_copy_to_stream_ex(newfile, phar->fp, PHP_STREAM_COPY_ALL, NULL);
php_stream_filter_flush(filter, 1);
php_stream_filter_remove(filter, 1 TSRMLS_CC);
php_stream_close(phar->fp);
/* use the temp stream as our base */
phar->fp = newfile;
} else {
php_stream_copy_to_stream_ex(newfile, phar->fp, PHP_STREAM_COPY_ALL, NULL);
/* we could also reopen the file in "rb" mode but there is no need for that */
php_stream_close(newfile);
}
}
return EOF;
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
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