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php-src/ext/mime_magic/mime_magic.c
Sebastian Bergmann d1dded8751 MFH: Bump copyright year, 2 of 2.
2007-12-31 07:17:19 +00:00

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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2008 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. |
+----------------------------------------------------------------------+
| Author: Hartmut Holzgraefe <hholzgra@php.net> |
+----------------------------------------------------------------------+
$Id$
This module contains a lot of stuff taken from Apache mod_mime_magic,
so the license section is a little bit longer than usual:
====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. 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.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/*
* mod_mime_magic: MIME type lookup via file magic numbers
* Copyright (c) 1996-1997 Cisco Systems, Inc.
*
* This software was submitted by Cisco Systems to the Apache Group in July
* 1997. Future revisions and derivatives of this source code must
* acknowledge Cisco Systems as the original contributor of this module.
* All other licensing and usage conditions are those of the Apache Group.
*
* Some of this code is derived from the free version of the file command
* originally posted to comp.sources.unix. Copyright info for that program
* is included below as required.
* ---------------------------------------------------------------------------
* - Copyright (c) Ian F. Darwin, 1987. Written by Ian F. Darwin.
*
* This software is not subject to any license of the American Telephone and
* Telegraph Company or of the Regents of the University of California.
*
* Permission is granted to anyone to use this software for any purpose on any
* computer system, and to alter it and redistribute it freely, subject to
* the following restrictions:
*
* 1. The author is not responsible for the consequences of use of this
* software, no matter how awful, even if they arise from flaws in it.
*
* 2. The origin of this software must not be misrepresented, either by
* explicit claim or by omission. Since few users ever read sources, credits
* must appear in the documentation.
*
* 3. Altered versions must be plainly marked as such, and must not be
* misrepresented as being the original software. Since few users ever read
* sources, credits must appear in the documentation.
*
* 4. This notice may not be removed or altered.
* -------------------------------------------------------------------------
*
* For compliance with Mr Darwin's terms: this has been very significantly
* modified from the free "file" command.
* - all-in-one file for compilation convenience when moving from one
* version of Apache to the next.
* - Memory allocation is done through the Apache API's pool structure.
* - All functions have had necessary Apache API request or server
* structures passed to them where necessary to call other Apache API
* routines. (i.e. usually for logging, files, or memory allocation in
* itself or a called function.)
* - struct magic has been converted from an array to a single-ended linked
* list because it only grows one record at a time, it's only accessed
* sequentially, and the Apache API has no equivalent of realloc().
* - Functions have been changed to get their parameters from the server
* configuration instead of globals. (It should be reentrant now but has
* not been tested in a threaded environment.)
* - Places where it used to print results to stdout now saves them in a
* list where they're used to set the MIME type in the Apache request
* record.
* - Command-line flags have been removed since they will never be used here.
*
* Ian Kluft <ikluft@cisco.com>
* Engineering Information Framework
* Central Engineering
* Cisco Systems, Inc.
* San Jose, CA, USA
*
* Initial installation July/August 1996
* Misc bug fixes May 1997
* Submission to Apache Group July 1997
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_streams.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_mime_magic.h"
#include "phpmimemagic.h"
#include <fcntl.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef PHP_WIN32
#define PHP_MIME_MAGIC_FILE_PATH PHP_PREFIX "\\magic.mime"
#endif
#define BYTE 1
#define SHORT 2
#define LONG 4
#define STRING 5
#define DATE 6
#define BESHORT 7
#define BELONG 8
#define BEDATE 9
#define LESHORT 10
#define LELONG 11
#define LEDATE 12
static int apprentice(void);
static int ascmagic(unsigned char *, int);
static int is_tar(unsigned char *, unsigned int);
static int softmagic(unsigned char *, int);
static void tryit(unsigned char *, int, int);
static int getvalue(struct magic *, char **);
static int hextoint(int);
static char *getstr(char *, char *, int, int *);
static int parse(char *, int);
static int match(unsigned char *, int);
static int mget(union VALUETYPE *, unsigned char *,
struct magic *, int);
static int mcheck(union VALUETYPE *, struct magic *);
static void mprint(union VALUETYPE *, struct magic *);
static int mconvert(union VALUETYPE *, struct magic *);
static int magic_rsl_get(char **, char **);
static int magic_process(zval * TSRMLS_DC);
static long from_oct(int, char *);
static int fsmagic(zval * TSRMLS_DC);
#if HAVE_ZLIB && !defined(COMPILE_DL_ZLIB)
static int zmagic(unsigned char *, int);
#endif
static magic_req_rec *magic_set_config(void);
static void magic_free_config(magic_req_rec *);
ZEND_DECLARE_MODULE_GLOBALS(mime_magic)
static PHP_GINIT_FUNCTION(mime_magic);
/* True global resources - no need for thread safety here */
static magic_server_config_rec mime_global;
/* {{{ mime_magic_functions[] */
const zend_function_entry mime_magic_functions[] = {
PHP_FE(mime_content_type, NULL)
{NULL, NULL, NULL}
};
/* }}} */
/* {{{ mime_magic_module_entry
*/
zend_module_entry mime_magic_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
STANDARD_MODULE_HEADER,
#endif
"mime_magic",
mime_magic_functions,
PHP_MINIT(mime_magic),
PHP_MSHUTDOWN(mime_magic),
NULL,
NULL,
PHP_MINFO(mime_magic),
#if ZEND_MODULE_API_NO >= 20010901
"0.1",
#endif
#if ZEND_MODULE_API_NO >= 20060613
PHP_MODULE_GLOBALS(mime_magic),
PHP_GINIT(mime_magic),
NULL,
NULL,
STANDARD_MODULE_PROPERTIES_EX
#else
STANDARD_MODULE_PROPERTIES
#endif
};
/* }}} */
#ifdef COMPILE_DL_MIME_MAGIC
ZEND_GET_MODULE(mime_magic)
#endif
/* {{{ PHP_INI
*/
PHP_INI_BEGIN()
STD_PHP_INI_ENTRY("mime_magic.magicfile", PHP_MIME_MAGIC_FILE_PATH, PHP_INI_SYSTEM, OnUpdateString, magicfile, zend_mime_magic_globals, mime_magic_globals)
STD_PHP_INI_BOOLEAN("mime_magic.debug", "0", PHP_INI_SYSTEM, OnUpdateBool, debug, zend_mime_magic_globals, mime_magic_globals)
PHP_INI_END()
/* }}} */
/* {{{ PHP_GINIT_FUNCTION
*/
static PHP_GINIT_FUNCTION(mime_magic)
{
memset(mime_magic_globals, 0, sizeof(zend_mime_magic_globals));
mime_global.magic = NULL;
mime_global.last = NULL;
}
/* }}} */
/* {{{ PHP_MINIT_FUNCTION
*/
PHP_MINIT_FUNCTION(mime_magic)
{
REGISTER_INI_ENTRIES();
if(MIME_MAGIC_G(magicfile)) {
if(apprentice()) {
MIME_MAGIC_G(status) = "invalid magic file, disabled";
} else {
MIME_MAGIC_G(status) = "enabled";
}
} else {
MIME_MAGIC_G(status) = "no magic file given, disabled";
}
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MSHUTDOWN_FUNCTION
*/
PHP_MSHUTDOWN_FUNCTION(mime_magic)
{
UNREGISTER_INI_ENTRIES();
if (mime_global.magic != NULL && mime_global.magic != (struct magic *) -1) {
struct magic *iter = mime_global.magic;
while (iter != NULL) {
struct magic *iter_next = iter->next;
free(iter);
iter = iter_next;
}
}
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MINFO_FUNCTION
*/
PHP_MINFO_FUNCTION(mime_magic)
{
php_info_print_table_start();
php_info_print_table_header(2, "mime_magic support", MIME_MAGIC_G(status));
php_info_print_table_end();
DISPLAY_INI_ENTRIES();
}
/* }}} */
/* {{{ proto string mime_content_type(string filename|resource stream)
Return content-type for file */
PHP_FUNCTION(mime_content_type)
{
zval *what;
magic_server_config_rec *conf = &mime_global;
char *content_type=NULL, *content_encoding=NULL;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &what) == FAILURE) {
return;
}
switch (Z_TYPE_P(what)) {
case IS_STRING:
break;
case IS_RESOURCE:
{
php_stream *stream;
php_stream_from_zval_no_verify(stream, &what);
if (stream) {
break;
}
}
/* fallthru if not a stream resource */
default:
php_error_docref(NULL TSRMLS_CC, E_WARNING, "can only process string or stream arguments");
RETURN_FALSE;
break;
}
if (conf->magic == (struct magic *)-1) {
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_ERROR, "mime_magic could not be initialized, magic file %s is not available", MIME_MAGIC_G(magicfile));
RETURN_FALSE;
}
if(!conf->magic) {
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, "mime_magic not initialized");
RETURN_FALSE;
}
MIME_MAGIC_G(req_dat) = magic_set_config();
if(MIME_MAGIC_OK != magic_process(what TSRMLS_CC)) {
RETVAL_FALSE;
} else if(MIME_MAGIC_OK != magic_rsl_get(&content_type, &content_encoding)) {
RETVAL_FALSE;
} else {
RETVAL_STRING(content_type, 1);
}
if(content_type) efree(content_type);
if(content_encoding) efree(content_encoding);
magic_free_config(MIME_MAGIC_G(req_dat));
}
/* }}} */
#define EATAB {while (isspace((unsigned char) *l)) ++l;}
/*
* apprentice - load configuration from the magic file r
* API request record
*/
static int apprentice(void)
{
FILE *f;
char line[BUFSIZ + 1];
int errs = 0;
int lineno;
char *fname;
magic_server_config_rec *conf = &mime_global;
TSRMLS_FETCH();
if (!MIME_MAGIC_G(magicfile)) {
return -1;
}
fname = MIME_MAGIC_G(magicfile); /* todo cwd? */
f = fopen(fname, "rb");
if (f == NULL) {
conf->magic = (struct magic *)-1;
return -1;
}
/* set up the magic list (empty) */
conf->magic = conf->last = NULL;
/* parse it */
for (lineno = 1; fgets(line, BUFSIZ, f) != NULL; lineno++) {
int ws_offset;
/* delete newline */
if (line[0]) {
line[strlen(line) - 1] = '\0';
}
/* skip leading whitespace */
ws_offset = 0;
while (line[ws_offset] && isspace(line[ws_offset])) {
ws_offset++;
}
/* skip blank lines */
if (line[ws_offset] == 0) {
continue;
}
/* comment, do not parse */
if (line[ws_offset] == '#')
continue;
/* parse it */
if (parse(line + ws_offset, lineno) != 0)
++errs;
}
(void) fclose(f);
return (errs ? -1 : 0);
}
/*
* extend the sign bit if the comparison is to be signed
*/
static unsigned long signextend(struct magic *m, unsigned long v)
{
if (!(m->flag & UNSIGNED))
switch (m->type) {
/*
* Do not remove the casts below. They are vital. When later
* compared with the data, the sign extension must have happened.
*/
case BYTE:
v = (char) v;
break;
case SHORT:
case BESHORT:
case LESHORT:
v = (short) v;
break;
case DATE:
case BEDATE:
case LEDATE:
case LONG:
case BELONG:
case LELONG:
v = (long) v;
break;
case STRING:
break;
default:
{
TSRMLS_FETCH();
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, ": can't happen: m->type=%d", m->type);
return -1;
}
}
return v;
}
/*
*
*/
static int is_valid_mimetype(char *p, int p_len)
{
if (p_len > 0) {
do {
if (!isalnum(*p) && (*p != '-') && (*p != '.')) {
return 0;
}
} while (*(++p) != '/');
++p;
do {
if (!isalnum(*p) && (*p != '-') && (*p != '.') && !isspace(*p)) {
return 0;
}
} while (*(++p));
}
return 1;
}
/*
* parse one line from magic file, put into magic[index++] if valid
*/
static int parse(char *l, int lineno)
{
struct magic *m;
char *t, *s;
magic_server_config_rec *conf = &mime_global;
TSRMLS_FETCH();
/* allocate magic structure entry */
m = (struct magic *) calloc(1, sizeof(struct magic));
/* append to linked list */
m->next = NULL;
if (!conf->magic || !conf->last) {
conf->magic = conf->last = m;
}
else {
conf->last->next = m;
conf->last = m;
}
/* set values in magic structure */
m->flag = 0;
m->cont_level = 0;
m->lineno = lineno;
while (*l == '>') {
++l; /* step over */
m->cont_level++;
}
if (m->cont_level != 0 && *l == '(') {
++l; /* step over */
m->flag |= INDIR;
}
/* get offset, then skip over it */
m->offset = (int) strtol(l, &t, 0);
if (l == t) {
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, ": (%s:%d) offset `%s' invalid", MIME_MAGIC_G(magicfile), lineno, l);
}
l = t;
if (m->flag & INDIR) {
m->in.type = LONG;
m->in.offset = 0;
/*
* read [.lbs][+-]nnnnn)
*/
if (*l == '.') {
switch (*++l) {
case 'l':
m->in.type = LONG;
break;
case 's':
m->in.type = SHORT;
break;
case 'b':
m->in.type = BYTE;
break;
default:
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, ": (%s:%d) indirect offset type %c invalid", MIME_MAGIC_G(magicfile), lineno, *l);
break;
}
l++;
}
s = l;
if (*l == '+' || *l == '-')
l++;
if (isdigit((unsigned char) *l)) {
m->in.offset = strtol(l, &t, 0);
if (*s == '-')
m->in.offset = -m->in.offset;
}
else
t = l;
if (*t++ != ')') {
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, ": (%s:%d) missing ')' in indirect offset", MIME_MAGIC_G(magicfile), lineno);
}
l = t;
}
while (isdigit((unsigned char) *l))
++l;
EATAB;
#define NBYTE 4
#define NSHORT 5
#define NLONG 4
#define NSTRING 6
#define NDATE 4
#define NBESHORT 7
#define NBELONG 6
#define NBEDATE 6
#define NLESHORT 7
#define NLELONG 6
#define NLEDATE 6
if (*l == 'u') {
++l;
m->flag |= UNSIGNED;
}
/* get type, skip it */
if (strncmp(l, "byte", NBYTE) == 0) {
m->type = BYTE;
l += NBYTE;
}
else if (strncmp(l, "short", NSHORT) == 0) {
m->type = SHORT;
l += NSHORT;
}
else if (strncmp(l, "long", NLONG) == 0) {
m->type = LONG;
l += NLONG;
}
else if (strncmp(l, "string", NSTRING) == 0) {
m->type = STRING;
l += NSTRING;
}
else if (strncmp(l, "date", NDATE) == 0) {
m->type = DATE;
l += NDATE;
}
else if (strncmp(l, "beshort", NBESHORT) == 0) {
m->type = BESHORT;
l += NBESHORT;
}
else if (strncmp(l, "belong", NBELONG) == 0) {
m->type = BELONG;
l += NBELONG;
}
else if (strncmp(l, "bedate", NBEDATE) == 0) {
m->type = BEDATE;
l += NBEDATE;
}
else if (strncmp(l, "leshort", NLESHORT) == 0) {
m->type = LESHORT;
l += NLESHORT;
}
else if (strncmp(l, "lelong", NLELONG) == 0) {
m->type = LELONG;
l += NLELONG;
}
else if (strncmp(l, "ledate", NLEDATE) == 0) {
m->type = LEDATE;
l += NLEDATE;
}
else {
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, ": (%s:%d) type %s invalid", MIME_MAGIC_G(magicfile), lineno, l);
return -1;
}
/* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
if (*l == '&') {
++l;
m->mask = signextend(m, strtol(l, &l, 0));
}
else
m->mask = ~0L;
EATAB;
switch (*l) {
case '>':
case '<':
/* Old-style anding: "0 byte &0x80 dynamically linked" */
case '&':
case '^':
case '=':
m->reln = *l;
++l;
break;
case '!':
if (m->type != STRING) {
m->reln = *l;
++l;
break;
}
/* FALL THROUGH */
default:
if (*l == 'x' && isspace((unsigned char) l[1])) {
m->reln = *l;
++l;
goto GetDesc; /* Bill The Cat */
}
m->reln = '=';
break;
}
EATAB;
if (getvalue(m, &l))
return -1;
/*
* now get last part - the description
*/
GetDesc:
EATAB;
if (l[0] == '\b') {
++l;
m->nospflag = 1;
}
else if ((l[0] == '\\') && (l[1] == 'b')) {
++l;
++l;
m->nospflag = 1;
}
else
m->nospflag = 0;
if (!is_valid_mimetype(l, strlen(l))) {
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, ": (%s:%d) '%s' is not a valid mimetype, entry skipped", MIME_MAGIC_G(magicfile), lineno, l);
return -1;
}
strlcpy(m->desc, l, sizeof(m->desc));
return 0;
}
/*
* Read a numeric value from a pointer, into the value union of a magic
* pointer, according to the magic type. Update the string pointer to point
* just after the number read. Return 0 for success, non-zero for failure.
*/
static int getvalue(struct magic *m, char **p)
{
int slen;
if (m->type == STRING) {
*p = getstr(*p, m->value.s, sizeof(m->value.s), &slen);
m->vallen = slen;
}
else if (m->reln != 'x')
m->value.l = signextend(m, strtol(*p, p, 0));
return 0;
}
/*
* Convert a string containing C character escapes. Stop at an unescaped
* space or tab. Copy the converted version to "p", returning its length in
* *slen. Return updated scan pointer as function result.
*/
static char *getstr(register char *s, register char *p,
int plen, int *slen)
{
char *origs = s, *origp = p;
char *pmax = p + plen - 1;
register int c;
register int val;
while ((c = *s++) != '\0') {
if (isspace((unsigned char) c))
break;
if (p >= pmax) {
TSRMLS_FETCH();
if(MIME_MAGIC_G(debug))
php_error_docref("http://www.php.net/mime_magic" TSRMLS_CC, E_WARNING, "string too long: %s", origs);
break;
}
if (c == '\\') {
switch (c = *s++) {
case '\0':
goto out;
default:
*p++ = (char) c;
break;
case 'n':
*p++ = '\n';
break;
case 'r':
*p++ = '\r';
break;
case 'b':
*p++ = '\b';
break;
case 't':
*p++ = '\t';
break;
case 'f':
*p++ = '\f';
break;
case 'v':
*p++ = '\v';
break;
/* \ and up to 3 octal digits */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
val = c - '0';
c = *s++; /* try for 2 */
if (c >= '0' && c <= '7') {
val = (val << 3) | (c - '0');
c = *s++; /* try for 3 */
if (c >= '0' && c <= '7')
val = (val << 3) | (c - '0');
else
--s;
}
else
--s;
*p++ = (char) val;
break;
/* \x and up to 3 hex digits */
case 'x':
val = 'x'; /* Default if no digits */
c = hextoint(*s++); /* Get next char */
if (c >= 0) {
val = c;
c = hextoint(*s++);
if (c >= 0) {
val = (val << 4) + c;
c = hextoint(*s++);
if (c >= 0) {
val = (val << 4) + c;
}
else
--s;
}
else
--s;
}
else
--s;
*p++ = (char) val;
break;
}
}
else
*p++ = (char) c;
}
out:
*p = '\0';
*slen = p - origp;
return s;
}
/* Single hex char to int; -1 if not a hex char. */
static int hextoint(int c)
{
if (isdigit((unsigned char) c))
return c - '0';
if ((c >= 'a') && (c <= 'f'))
return c + 10 - 'a';
if ((c >= 'A') && (c <= 'F'))
return c + 10 - 'A';
return -1;
}
/*
* RSL (result string list) processing routines
*
* These collect strings that would have been printed in fragments by file(1)
* into a list of magic_rsl structures with the strings. When complete,
* they're concatenated together to become the MIME content and encoding
* types.
*
* return value conventions for these functions: functions which return int:
* failure = -1, other = result functions which return pointers: failure = 0,
* other = result
*/
/* allocate a per-request structure and put it in the request record */
static magic_req_rec *magic_set_config(void)
{
magic_req_rec *req_dat = (magic_req_rec *) emalloc(sizeof(magic_req_rec));
req_dat->head = req_dat->tail = (magic_rsl *) NULL;
return req_dat;
}
static void magic_free_config(magic_req_rec *req_dat) {
magic_rsl *curr, *next;
if(!req_dat) return;
curr = req_dat->head;
while(curr) {
next = curr->next;
efree(curr->str);
efree(curr);
curr = next;
}
efree(req_dat);
}
/* add a string to the result string list for this request */
/* it is the responsibility of the caller to allocate "str" */
static int magic_rsl_add(char *str)
{
magic_req_rec *req_dat;
magic_rsl *rsl;
TSRMLS_FETCH();
req_dat = MIME_MAGIC_G(req_dat);
/* make sure we have a list to put it in */
if (!req_dat) {
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "request config should not be NULL");
if (!(req_dat = magic_set_config())) {
/* failure */
return -1;
}
}
/* allocate the list entry */
rsl = (magic_rsl *) emalloc(sizeof(magic_rsl));
/* fill it */
rsl->str = estrdup(str);
rsl->next = (magic_rsl *) NULL;
/* append to the list */
if (req_dat->head && req_dat->tail) {
req_dat->tail->next = rsl;
req_dat->tail = rsl;
}
else {
req_dat->head = req_dat->tail = rsl;
}
/* success */
return 0;
}
/* RSL hook for puts-type functions */
static int magic_rsl_puts(char *str)
{
return magic_rsl_add(str);
}
/* RSL hook for printf-type functions */
static int magic_rsl_printf(char *str,...)
{
va_list ap;
char buf[MAXMIMESTRING];
/* assemble the string into the buffer */
va_start(ap, str);
vsnprintf(buf, sizeof(buf), str, ap);
va_end(ap);
/* add the buffer to the list */
return magic_rsl_add(buf);
}
/* RSL hook for putchar-type functions */
static int magic_rsl_putchar(char c)
{
char str[2];
/* high overhead for 1 char - just hope they don't do this much */
str[0] = c;
str[1] = '\0';
return magic_rsl_add(str);
}
/* allocate and copy a contiguous string from a result string list */
static char *rsl_strdup(int start_frag, int start_pos, int len)
{
char *result; /* return value */
int cur_frag, /* current fragment number/counter */
cur_pos, /* current position within fragment */
res_pos; /* position in result string */
magic_rsl *frag; /* list-traversal pointer */
magic_req_rec *req_dat;
TSRMLS_FETCH();
req_dat = MIME_MAGIC_G(req_dat);
/* allocate the result string */
result = (char *) emalloc(len + 2);
/* loop through and collect the string */
res_pos = 0;
for (frag = req_dat->head, cur_frag = 0;
frag->next;
frag = frag->next, cur_frag++) {
/* loop to the first fragment */
if (cur_frag < start_frag)
continue;
/* loop through and collect chars */
for (cur_pos = (cur_frag == start_frag) ? start_pos : 0;
frag->str[cur_pos];
cur_pos++) {
if (cur_frag >= start_frag
&& cur_pos >= start_pos
&& res_pos <= len) {
result[res_pos++] = frag->str[cur_pos];
if (res_pos > len) {
break;
}
}
}
}
/* clean up and return */
result[res_pos] = 0;
return result;
}
/*
* magic_process - process input file r Apache API request record
* (formerly called "process" in file command, prefix added for clarity) Opens
* the file and reads a fixed-size buffer to begin processing the contents.
*/
static int magic_process(zval *what TSRMLS_DC)
{
php_stream *stream;
unsigned char buf[HOWMANY + 1]; /* one extra for terminating '\0' */
int nbytes = 0; /* number of bytes read from a datafile */
int result;
off_t streampos;
/*
* first try judging the file based on its filesystem status
*/
switch ((result = fsmagic(what TSRMLS_CC))) {
case MIME_MAGIC_DONE:
magic_rsl_putchar('\n');
return MIME_MAGIC_OK;
case MIME_MAGIC_OK:
break;
default:
/* fatal error, bail out */
return result;
}
switch (Z_TYPE_P(what)) {
case IS_STRING:
stream = php_stream_open_wrapper(Z_STRVAL_P(what), "rb", IGNORE_PATH | ENFORCE_SAFE_MODE | REPORT_ERRORS, NULL);
if (stream == NULL) {
/* We can't open it, but we were able to stat it. */
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "can't read `%s'", Z_STRVAL_P(what));
/* let some other handler decide what the problem is */
return MIME_MAGIC_DECLINED;
}
break;
case IS_RESOURCE:
php_stream_from_zval_no_verify(stream, &what); /* we tested this before, so it should work here */
streampos = php_stream_tell(stream); /* remember stream position for restauration */
php_stream_seek(stream, 0, SEEK_SET);
break;
default:
return -1;
}
/*
* try looking at the first HOWMANY bytes
*/
if ((nbytes = php_stream_read(stream, (char *) buf, sizeof(buf) - 1)) == -1) {
if(MIME_MAGIC_G(debug)) {
if (Z_TYPE_P(what) == IS_RESOURCE) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "read failed on stream");
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "read failed: %s", Z_STRVAL_P(what));
}
}
return MIME_MAGIC_ERROR;
}
if (nbytes == 0)
magic_rsl_puts(MIME_TEXT_UNKNOWN);
else {
buf[nbytes++] = '\0'; /* null-terminate it */
tryit(buf, nbytes, 1);
}
if (Z_TYPE_P(what) == IS_RESOURCE) {
php_stream_seek(stream, streampos, SEEK_SET);
} else {
(void) php_stream_close(stream);
}
(void) magic_rsl_putchar('\n');
return MIME_MAGIC_OK;
}
static void tryit(unsigned char *buf, int nb, int checkzmagic)
{
/*
* Try compression stuff
*/
#if HAVE_ZLIB && !defined(COMPILE_DL_ZLIB)
if (checkzmagic == 1) {
if (zmagic(buf, nb) == 1)
return;
}
#endif
/*
* try tests in /etc/magic (or surrogate magic file)
*/
if (softmagic(buf, nb) == 1)
return;
/*
* try known keywords, check for ascii-ness too.
*/
if (ascmagic(buf, nb) == 1)
return;
/*
* abandon hope, all ye who remain here
*/
magic_rsl_puts(MIME_BINARY_UNKNOWN);
}
/*
* return MIME_MAGIC_DONE to indicate it's been handled
* return MIME_MAGIC_OK to indicate it's a regular file still needing handling
* other returns indicate a failure of some sort
*/
static int fsmagic(zval *what TSRMLS_DC)
{
php_stream_statbuf stat_ssb;
switch (Z_TYPE_P(what)) {
case IS_STRING:
if (php_stream_stat_path_ex(Z_STRVAL_P(what), PHP_STREAM_URL_STAT_QUIET, &stat_ssb, NULL)) {
if (MIME_MAGIC_G(debug)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Non-statable file path (%s)", Z_STRVAL_P(what));
}
return MIME_MAGIC_ERROR;
}
break;
case IS_RESOURCE:
{
php_stream *stream;
php_stream_from_zval_no_verify(stream, &what);
if (php_stream_stat(stream, &stat_ssb)) {
if (MIME_MAGIC_G(debug)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Non-statable file path (%s)", Z_STRVAL_P(what));
}
return MIME_MAGIC_ERROR;
}
}
break;
default:
return MIME_MAGIC_OK;
}
switch (stat_ssb.sb.st_mode & S_IFMT) {
case S_IFDIR:
magic_rsl_puts(DIR_MAGIC_TYPE);
return MIME_MAGIC_DONE;
case S_IFCHR:
/*
* (void) magic_rsl_printf(r,"character special (%d/%d)",
* major(sb->st_rdev), minor(sb->st_rdev));
*/
(void) magic_rsl_puts(MIME_BINARY_UNKNOWN);
return MIME_MAGIC_DONE;
#ifdef S_IFBLK
case S_IFBLK:
/*
* (void) magic_rsl_printf(r,"block special (%d/%d)",
* major(sb->st_rdev), minor(sb->st_rdev));
*/
(void) magic_rsl_puts(MIME_BINARY_UNKNOWN);
return MIME_MAGIC_DONE;
/* TODO add code to handle V7 MUX and Blit MUX files */
#endif
#ifdef S_IFIFO
case S_IFIFO:
/*
* magic_rsl_puts(r,"fifo (named pipe)");
*/
(void) magic_rsl_puts(MIME_BINARY_UNKNOWN);
return MIME_MAGIC_DONE;
#endif
#ifdef S_IFLNK
case S_IFLNK:
/* We used stat(), the only possible reason for this is that the
* symlink is broken.
*/
if(MIME_MAGIC_G(debug)) {
/* no need to check argument type here, this can only happen with strings */
php_error_docref(NULL TSRMLS_CC, E_WARNING, "broken symlink (%s)", Z_STRVAL_P(what));
}
return MIME_MAGIC_ERROR;
#endif
#ifdef S_IFSOCK
#ifndef __COHERENT__
case S_IFSOCK:
magic_rsl_puts(MIME_BINARY_UNKNOWN);
return MIME_MAGIC_DONE;
#endif
#endif
case S_IFREG:
break;
case 0:
break;
default:
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "invalid mode 0%o.", (unsigned int)stat_ssb.sb.st_mode);
return MIME_MAGIC_ERROR;
}
/*
* regular file, check next possibility
*/
if (stat_ssb.sb.st_size == 0) {
magic_rsl_puts(MIME_TEXT_UNKNOWN);
return MIME_MAGIC_DONE;
}
return MIME_MAGIC_OK;
}
/*
* softmagic - lookup one file in database (already read from /etc/magic by
* apprentice.c). Passed the name and FILE * of one file to be typed.
*/
/* ARGSUSED1 *//* nbytes passed for regularity, maybe need later */
static int softmagic(unsigned char *buf, int nbytes)
{
if (match(buf, nbytes))
return 1;
return 0;
}
/*
* Go through the whole list, stopping if you find a match. Process all the
* continuations of that match before returning.
*
* We support multi-level continuations:
*
* At any time when processing a successful top-level match, there is a current
* continuation level; it represents the level of the last successfully
* matched continuation.
*
* Continuations above that level are skipped as, if we see one, it means that
* the continuation that controls them - i.e, the lower-level continuation
* preceding them - failed to match.
*
* Continuations below that level are processed as, if we see one, it means
* we've finished processing or skipping higher-level continuations under the
* control of a successful or unsuccessful lower-level continuation, and are
* now seeing the next lower-level continuation and should process it. The
* current continuation level reverts to the level of the one we're seeing.
*
* Continuations at the current level are processed as, if we see one, there's
* no lower-level continuation that may have failed.
*
* If a continuation matches, we bump the current continuation level so that
* higher-level continuations are processed.
*/
static int match(unsigned char *s, int nbytes)
{
int cont_level = 0;
int need_separator = 0;
union VALUETYPE p;
magic_server_config_rec *conf = &mime_global;
struct magic *m;
for (m = conf->magic; m; m = m->next) {
/* check if main entry matches */
if (!mget(&p, s, m, nbytes) ||
!mcheck(&p, m)) {
struct magic *m_cont;
/*
* main entry didn't match, flush its continuations
*/
if (!m->next || (m->next->cont_level == 0)) {
continue;
}
m_cont = m->next;
while (m_cont && (m_cont->cont_level != 0)) {
/*
* this trick allows us to keep *m in sync when the continue
* advances the pointer
*/
m = m_cont;
m_cont = m_cont->next;
}
continue;
}
/* if we get here, the main entry rule was a match */
/* this will be the last run through the loop */
/* print the match */
mprint(&p, m);
/*
* If we printed something, we'll need to print a blank before we
* print something else.
*/
if (m->desc[0])
need_separator = 1;
/* and any continuations that match */
cont_level++;
/*
* while (m && m->next && m->next->cont_level != 0 && ( m = m->next
* ))
*/
m = m->next;
while (m && (m->cont_level != 0)) {
if (cont_level >= m->cont_level) {
if (cont_level > m->cont_level) {
/*
* We're at the end of the level "cont_level"
* continuations.
*/
cont_level = m->cont_level;
}
if (mget(&p, s, m, nbytes) &&
mcheck(&p, m)) {
/*
* This continuation matched. Print its message, with a
* blank before it if the previous item printed and this
* item isn't empty.
*/
/* space if previous printed */
if (need_separator
&& (m->nospflag == 0)
&& (m->desc[0] != '\0')
) {
(void) magic_rsl_putchar(' ');
need_separator = 0;
}
mprint(&p, m);
if (m->desc[0])
need_separator = 1;
/*
* If we see any continuations at a higher level, process
* them.
*/
cont_level++;
}
}
/* move to next continuation record */
m = m->next;
}
return 1; /* all through */
}
return 0; /* no match at all */
}
/* an optimization over plain strcmp() */
#define STREQ(a, b) (*(a) == *(b) && strcmp((a), (b)) == 0)
static int ascmagic(unsigned char *buf, int nbytes)
{
int has_escapes = 0;
unsigned char *s;
char nbuf[HOWMANY + 1]; /* one extra for terminating '\0' */
char *token;
register struct names *p;
int small_nbytes;
char *strtok_buf = NULL;
/* these are easy, do them first */
/*
* for troff, look for . + letter + letter or .\"; this must be done to
* disambiguate tar archives' ./file and other trash from real troff
* input.
*/
if (*buf == '.') {
unsigned char *tp = buf + 1;
while (isspace(*tp))
++tp; /* skip leading whitespace */
if ((isalnum(*tp) || *tp == '\\') &&
(isalnum(*(tp + 1)) || *tp == '"')) {
magic_rsl_puts("application/x-troff");
return 1;
}
}
if ((*buf == 'c' || *buf == 'C') && isspace(*(buf + 1))) {
/* Fortran */
magic_rsl_puts("text/plain");
return 1;
}
/* look for tokens from names.h - this is expensive!, so we'll limit
* ourselves to only SMALL_HOWMANY bytes */
small_nbytes = (nbytes > SMALL_HOWMANY) ? SMALL_HOWMANY : nbytes;
/* make a copy of the buffer here because strtok() will destroy it */
s = (unsigned char *) memcpy(nbuf, buf, small_nbytes);
s[small_nbytes] = '\0';
has_escapes = (memchr(s, '\033', small_nbytes) != NULL);
while ((token = php_strtok_r((char *) s, " \t\n\r\f", &strtok_buf)) != NULL) {
s = NULL; /* make strtok() keep on tokin' */
for (p = names; p < names + NNAMES; p++) {
if (STREQ(p->name, token)) {
magic_rsl_puts(types[p->type]);
if (has_escapes)
magic_rsl_puts(" (with escape sequences)");
return 1;
}
}
}
switch (is_tar(buf, nbytes)) {
case 1:
/* V7 tar archive */
magic_rsl_puts("application/x-tar");
return 1;
case 2:
/* POSIX tar archive */
magic_rsl_puts("application/x-tar");
return 1;
}
/* all else fails, but it is ascii... */
if (has_escapes) {
/* text with escape sequences */
/* we leave this open for further differentiation later */
magic_rsl_puts("text/plain");
}
else {
/* plain text */
magic_rsl_puts("text/plain");
}
return 1;
}
/*
* is_tar() -- figure out whether file is a tar archive.
*
* Stolen (by author of file utility) from the public domain tar program: Public
* Domain version written 26 Aug 1985 John Gilmore (ihnp4!hoptoad!gnu).
*
* @(#)list.c 1.18 9/23/86 Public Domain - gnu $Id: mod_mime_magic.c,v 1.7
* 1997/06/24 00:41:02 ikluft Exp ikluft $
*
* Comments changed and some code/comments reformatted for file command by Ian
* Darwin.
*/
#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
/*
* Return 0 if the checksum is bad (i.e., probably not a tar archive), 1 for
* old UNIX tar file, 2 for Unix Std (POSIX) tar file.
*/
static int is_tar(unsigned char *buf, unsigned int nbytes)
{
register union record *header = (union record *) buf;
register int i;
register long sum, recsum;
register char *p;
if (nbytes < sizeof(union record))
return 0;
recsum = from_oct(8, header->header.chksum);
sum = 0;
p = header->charptr;
for (i = sizeof(union record); --i >= 0;) {
/*
* We can't use unsigned char here because of old compilers, e.g. V7.
*/
sum += 0xFF & *p++;
}
/* Adjust checksum to count the "chksum" field as blanks. */
for (i = sizeof(header->header.chksum); --i >= 0;)
sum -= 0xFF & header->header.chksum[i];
sum += ' ' * sizeof header->header.chksum;
if (sum != recsum)
return 0; /* Not a tar archive */
if (0 == strcmp(header->header.magic, TMAGIC))
return 2; /* Unix Standard tar archive */
return 1; /* Old fashioned tar archive */
}
/*
* Quick and dirty octal conversion.
*
* Result is -1 if the field is invalid (all blank, or nonoctal).
*/
static long from_oct(int digs, char *where)
{
register long value;
while (isspace(*where)) { /* Skip spaces */
where++;
if (--digs <= 0)
return -1; /* All blank field */
}
value = 0;
while (digs > 0 && isodigit(*where)) { /* Scan til nonoctal */
value = (value << 3) | (*where++ - '0');
--digs;
}
if (digs > 0 && *where && !isspace(*where))
return -1; /* Ended on non-space/nul */
return value;
}
static int mget(union VALUETYPE *p, unsigned char *s,
struct magic *m, int nbytes)
{
long offset = m->offset;
if (offset + (long)sizeof(union VALUETYPE) > nbytes)
return 0;
memcpy(p, s + offset, sizeof(union VALUETYPE));
if (!mconvert(p, m))
return 0;
if (m->flag & INDIR) {
switch (m->in.type) {
case BYTE:
offset = p->b + m->in.offset;
break;
case SHORT:
offset = p->h + m->in.offset;
break;
case LONG:
offset = p->l + m->in.offset;
break;
}
if (offset + (long)sizeof(union VALUETYPE) > nbytes)
return 0;
memcpy(p, s + offset, sizeof(union VALUETYPE));
if (!mconvert(p, m))
return 0;
}
return 1;
}
static int mcheck(union VALUETYPE *p, struct magic *m)
{
register unsigned long l = m->value.l;
register unsigned long v;
int matched;
TSRMLS_FETCH();
if ((m->value.s[0] == 'x') && (m->value.s[1] == '\0')) {
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "BOINK");
return 1;
}
switch (m->type) {
case BYTE:
v = p->b;
break;
case SHORT:
case BESHORT:
case LESHORT:
v = p->h;
break;
case LONG:
case BELONG:
case LELONG:
case DATE:
case BEDATE:
case LEDATE:
v = p->l;
break;
case STRING:
l = 0;
/*
* What we want here is: v = strncmp(m->value.s, p->s, m->vallen);
* but ignoring any nulls. bcmp doesn't give -/+/0 and isn't
* universally available anyway.
*/
v = 0;
{
register unsigned char *a = (unsigned char *) m->value.s;
register unsigned char *b = (unsigned char *) p->s;
register int len = m->vallen;
while (--len >= 0)
if ((v = *b++ - *a++) != 0)
break;
}
break;
default:
/* bogosity, pretend that it just wasn't a match */
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "invalid type %d in mcheck().", m->type);
return 0;
}
v = signextend(m, v) & m->mask;
switch (m->reln) {
case 'x':
matched = 1;
break;
case '!':
matched = v != l;
break;
case '=':
matched = v == l;
break;
case '>':
if (m->flag & UNSIGNED) {
matched = v > l;
}
else {
matched = (long) v > (long) l;
}
break;
case '<':
if (m->flag & UNSIGNED) {
matched = v < l;
}
else {
matched = (long) v < (long) l;
}
break;
case '&':
matched = (v & l) == l;
break;
case '^':
matched = (v & l) != l;
break;
default:
/* bogosity, pretend it didn't match */
matched = 0;
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "mcheck: can't happen: invalid relation %d.", m->reln);
break;
}
return matched;
}
#if HAVE_ZLIB && !defined(COMPILE_DL_ZLIB)
/*
* compress routines: zmagic() - returns 0 if not recognized, uncompresses
* and prints information if recognized uncompress(s, method, old, n, newch)
* - uncompress old into new, using method, return sizeof new
*/
static int zmagic(unsigned char *buf, int nbytes)
{
if (buf[0] != 0x1f) return 0;
switch(buf[1]) {
case 0x9d: /* .Z "x-compress" */
break; /* not yet supportet */
case 0x8b: /* .gz "x-gzip" */
#if 0
if ((newsize = magic_uncompress(i, &newbuf, nbytes)) > 0) {
tryit(newbuf, newsize, 0);
/* set encoding type in the request record */
/* TODO r->content_encoding = compr[i].encoding; */
}
#endif
break; /* not yet supported */
case 0x1e: /* simply packed ? */
break; /* not yet supported */
}
return 0;
}
#endif
static void mprint(union VALUETYPE *p, struct magic *m)
{
char *pp, *rt;
unsigned long v;
switch (m->type) {
case BYTE:
v = p->b;
break;
case SHORT:
case BESHORT:
case LESHORT:
v = p->h;
break;
case LONG:
case BELONG:
case LELONG:
v = p->l;
break;
case STRING:
if (m->reln == '=') {
(void) magic_rsl_printf(m->desc, m->value.s);
}
else {
(void) magic_rsl_printf(m->desc, p->s);
}
return;
case DATE:
case BEDATE:
case LEDATE:
{
char ctimebuf[52];
pp = php_ctime_r((time_t *) &p->l, ctimebuf);
if (!pp) {
return;
}
if ((rt = strchr(pp, '\n')) != NULL) {
*rt = '\0';
}
(void) magic_rsl_printf(m->desc, pp);
return;
}
default:
{
TSRMLS_FETCH();
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "invalid m->type (%d) in mprint().", m->type);
return;
}
}
v = signextend(m, v) & m->mask;
(void) magic_rsl_printf(m->desc, (unsigned long) v);
}
/*
* Convert the byte order of the data we are looking at
*/
static int mconvert(union VALUETYPE *p, struct magic *m)
{
char *rt;
switch (m->type) {
case BYTE:
case SHORT:
case LONG:
case DATE:
return 1;
case STRING:
/* Null terminate and eat the return */
p->s[sizeof(p->s) - 1] = '\0';
if ((rt = strchr(p->s, '\n')) != NULL)
*rt = '\0';
return 1;
case BESHORT:
p->h = (short) ((p->hs[0] << 8) | (p->hs[1]));
return 1;
case BELONG:
case BEDATE:
p->l = (long)
((p->hl[0] << 24) | (p->hl[1] << 16) | (p->hl[2] << 8) | (p->hl[3]));
return 1;
case LESHORT:
p->h = (short) ((p->hs[1] << 8) | (p->hs[0]));
return 1;
case LELONG:
case LEDATE:
p->l = (long)
((p->hl[3] << 24) | (p->hl[2] << 16) | (p->hl[1] << 8) | (p->hl[0]));
return 1;
default:
{
TSRMLS_FETCH();
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "invalid type %d in mconvert().", m->type);
return 0;
}
}
}
/* states for the state-machine algorithm in magic_rsl_to_request() */
typedef enum {
rsl_leading_space, rsl_type, rsl_subtype, rsl_separator, rsl_encoding
} rsl_states;
/* process the RSL and set the MIME info in the request record */
static int magic_rsl_get(char **content_type, char **content_encoding)
{
int cur_frag, /* current fragment number/counter */
cur_pos, /* current position within fragment */
type_frag, /* content type starting point: fragment */
type_pos, /* content type starting point: position */
type_len, /* content type length */
encoding_frag, /* content encoding starting point: fragment */
encoding_pos, /* content encoding starting point: position */
encoding_len; /* content encoding length */
magic_rsl *frag; /* list-traversal pointer */
rsl_states state;
magic_req_rec *req_dat;
TSRMLS_FETCH();
req_dat = MIME_MAGIC_G(req_dat);
/* check if we have a result */
if (!req_dat || !req_dat->head) {
/* empty - no match, we defer to other Apache modules */
return MIME_MAGIC_DECLINED;
}
/* start searching for the type and encoding */
state = rsl_leading_space;
type_frag = type_pos = type_len = 0;
encoding_frag = encoding_pos = encoding_len = 0;
for (frag = req_dat->head, cur_frag = 0;
frag && frag->next;
frag = frag->next, cur_frag++) {
/* loop through the characters in the fragment */
for (cur_pos = 0; frag->str[cur_pos]; cur_pos++) {
if (isspace(frag->str[cur_pos])) {
/* process whitespace actions for each state */
if (state == rsl_leading_space) {
/* eat whitespace in this state */
continue;
}
else if (state == rsl_type) {
/* whitespace: type has no slash! */
return MIME_MAGIC_DECLINED;
}
else if (state == rsl_subtype) {
/* whitespace: end of MIME type */
state++;
continue;
}
else if (state == rsl_separator) {
/* eat whitespace in this state */
continue;
}
else if (state == rsl_encoding) {
/* whitespace: end of MIME encoding */
/* we're done */
frag = req_dat->tail;
break;
}
else {
/* should not be possible */
/* abandon malfunctioning module */
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, ": bad state %d (ws)", state);
return MIME_MAGIC_DECLINED;
}
/* NOTREACHED */
}
else if (state == rsl_type &&
frag->str[cur_pos] == '/') {
/* copy the char and go to rsl_subtype state */
type_len++;
state++;
}
else {
/* process non-space actions for each state */
if (state == rsl_leading_space) {
/* non-space: begin MIME type */
state++;
type_frag = cur_frag;
type_pos = cur_pos;
type_len = 1;
continue;
}
else if (state == rsl_type ||
state == rsl_subtype) {
/* non-space: adds to type */
type_len++;
continue;
}
else if (state == rsl_separator) {
/* non-space: begin MIME encoding */
state++;
encoding_frag = cur_frag;
encoding_pos = cur_pos;
encoding_len = 1;
continue;
}
else if (state == rsl_encoding) {
/* non-space: adds to encoding */
encoding_len++;
continue;
}
else {
/* should not be possible */
/* abandon malfunctioning module */
if(MIME_MAGIC_G(debug))
php_error_docref(NULL TSRMLS_CC, E_WARNING, "bad state %d (ns)", state);
return MIME_MAGIC_DECLINED;
}
/* NOTREACHED */
}
/* NOTREACHED */
}
}
/* if we ended prior to state rsl_subtype, we had incomplete info */
if (state != rsl_subtype && state != rsl_separator &&
state != rsl_encoding) {
/* defer to other modules */
return MIME_MAGIC_DECLINED;
}
/* save the info in the request record */
if (state == rsl_subtype || state == rsl_encoding ||
state == rsl_encoding) {
char *tmp;
tmp = rsl_strdup(type_frag, type_pos, type_len);
/* XXX: this could be done at config time I'm sure... but I'm
* confused by all this magic_rsl stuff. -djg */
/* TODO ap_content_type_tolower(tmp); */
*content_type = tmp;
}
if (state == rsl_encoding) {
char *tmp;
tmp = rsl_strdup(encoding_frag,
encoding_pos, encoding_len);
/* XXX: this could be done at config time I'm sure... but I'm
* confused by all this magic_rsl stuff. -djg */
/* TODO ap_str_tolower(tmp); */
*content_encoding = tmp;
}
/* detect memory allocation errors */
if (!content_type || !(*content_type) || (state == rsl_encoding && !*content_encoding)) {
return MIME_MAGIC_ERROR;
}
/* success! */
return MIME_MAGIC_OK;
}
/*
* 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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