exif.c

php-4.4.7学习linux时下载的源代码

/*
   +----------------------------------------------------------------------+
   | PHP Version 4                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2007 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          |
   | [e-mail] so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Rasmus Lerdorf <[e-mail]>                             |
   |          Marcus Boerger <[e-mail]>                              |
   +----------------------------------------------------------------------+
 */

/* $Id: exif.c,v 1.118.2.37.2.7 2007/01/09 11:38:04 tony2001 Exp $ */

/*  ToDos
 *
 * 	See if example images from http://www.exif.org have illegal
 * 		thumbnail sizes or if code is corrupt.
 * 	Create/Update exif headers.
 * 	Create/Remove/Update image thumbnails.
 */

/*  Security
 *
 *  At current time i do not see any security problems but a potential
 *  attacker could generate an image with recursive ifd pointers...(Marcus)
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"
#include "ext/standard/file.h"

#if HAVE_EXIF

/* When EXIF_DEBUG is defined the module generates a lot of debug messages
 * that help understanding what is going on. This can and should be used
 * while extending the module as it shows if you are at the right position.
 * You are always considered to have a copy of TIFF6.0 and EXIF2.10 standard.
 */
#undef EXIF_DEBUG

#undef EXIF_JPEG2000

#include "php_exif.h"
#include <math.h>
#include "php_ini.h"
#include "ext/standard/php_string.h"
#include "ext/standard/php_image.h"
#include "ext/standard/info.h" 

#if defined(PHP_WIN32) || (HAVE_MBSTRING && !defined(COMPILE_DL_MBSTRING))
#define EXIF_USE_MBSTRING 1
#else
#define EXIF_USE_MBSTRING 0
#endif

#if EXIF_USE_MBSTRING
#include "ext/mbstring/mbstring.h"
#endif

/* needed for ssize_t definition */
#include <sys/types.h>
#if defined(PHP_WIN32) && !defined(ssize_t)
typedef SSIZE_T ssize_t;
#endif

typedef unsigned char uchar;

#ifndef safe_emalloc
# define safe_emalloc(a,b,c) emalloc((a)*(b)+(c))
#endif

#ifndef TRUE
#	define TRUE 1
#	define FALSE 0
#endif

#ifndef max
#	define max(a,b) ((a)>(b) ? (a) : (b))
#endif

#define EFREE_IF(ptr)	if (ptr) efree(ptr)

#define MAX_IFD_NESTING_LEVEL 100

static unsigned char exif_thumbnail_force_ref[] = {2, BYREF_NONE, BYREF_FORCE_REST};

/* {{{ exif_functions[]
 */
function_entry exif_functions[] = {
	PHP_FE(exif_read_data, NULL)
	PHP_FALIAS(read_exif_data, exif_read_data, NULL)
	PHP_FE(exif_tagname, NULL)
	PHP_FE(exif_thumbnail, exif_thumbnail_force_ref)
	PHP_FE(exif_imagetype, NULL)
	{NULL, NULL, NULL}
};
/* }}} */

#define EXIF_VERSION "1.4 $Id: exif.c,v 1.118.2.37.2.7 2007/01/09 11:38:04 tony2001 Exp $"

/* {{{ PHP_MINFO_FUNCTION
 */
PHP_MINFO_FUNCTION(exif)
{
	php_info_print_table_start();
	php_info_print_table_row(2, "EXIF Support", "enabled");
	php_info_print_table_row(2, "EXIF Version", EXIF_VERSION);
	php_info_print_table_row(2, "Supported EXIF Version", "0220");
	php_info_print_table_row(2, "Supported filetypes", "JPEG,TIFF");
	php_info_print_table_end();
}
/* }}} */

ZEND_BEGIN_MODULE_GLOBALS(exif)
	char * encode_unicode;
	char * decode_unicode_be;
	char * decode_unicode_le;
	char * encode_jis;
	char * decode_jis_be;
	char * decode_jis_le;
ZEND_END_MODULE_GLOBALS(exif) 

ZEND_DECLARE_MODULE_GLOBALS(exif)

#ifdef ZTS
#define EXIF_G(v) TSRMG(exif_globals_id, zend_exif_globals *, v)
#else
#define EXIF_G(v) (exif_globals.v)
#endif
 
/* {{{ PHP_INI
 */

ZEND_INI_MH(OnUpdateEncode)
{
#if EXIF_USE_MBSTRING
	if (new_value && strlen(new_value) && !php_mb_check_encoding_list(new_value TSRMLS_CC)) {
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Illegal encoding ignored: '%s'", new_value);
		return FAILURE;
	}
#endif
	return OnUpdateString(entry, new_value, new_value_length, mh_arg1, mh_arg2, mh_arg3, stage TSRMLS_CC);
}

ZEND_INI_MH(OnUpdateDecode)
{
#if EXIF_USE_MBSTRING
	if (!php_mb_check_encoding_list(new_value TSRMLS_CC)) {
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Illegal encoding ignored: '%s'", new_value);
		return FAILURE;
	}
#endif
	return OnUpdateString(entry, new_value, new_value_length, mh_arg1, mh_arg2, mh_arg3, stage TSRMLS_CC);
}

PHP_INI_BEGIN()
    STD_PHP_INI_ENTRY("exif.encode_unicode",          "ISO-8859-15", PHP_INI_ALL, OnUpdateEncode, encode_unicode,    zend_exif_globals, exif_globals)
    STD_PHP_INI_ENTRY("exif.decode_unicode_motorola", "UCS-2BE",     PHP_INI_ALL, OnUpdateDecode, decode_unicode_be, zend_exif_globals, exif_globals)
    STD_PHP_INI_ENTRY("exif.decode_unicode_intel",    "UCS-2LE",     PHP_INI_ALL, OnUpdateDecode, decode_unicode_le, zend_exif_globals, exif_globals)
    STD_PHP_INI_ENTRY("exif.encode_jis",              "",            PHP_INI_ALL, OnUpdateEncode, encode_jis,        zend_exif_globals, exif_globals)
    STD_PHP_INI_ENTRY("exif.decode_jis_motorola",     "JIS",         PHP_INI_ALL, OnUpdateDecode, decode_jis_be,     zend_exif_globals, exif_globals)
    STD_PHP_INI_ENTRY("exif.decode_jis_intel",        "JIS",         PHP_INI_ALL, OnUpdateDecode, decode_jis_le,     zend_exif_globals, exif_globals)
PHP_INI_END()
/* }}} */
 
/* {{{ php_extname_init_globals
 */
static void php_exif_init_globals(zend_exif_globals *exif_globals)
{
	exif_globals->encode_unicode    = NULL;
	exif_globals->decode_unicode_be = NULL;
	exif_globals->decode_unicode_le = NULL;
	exif_globals->encode_jis        = NULL;
	exif_globals->decode_jis_be     = NULL;
	exif_globals->decode_jis_le     = NULL;
}
/* }}} */

/* {{{ PHP_MINIT_FUNCTION(exif)
   Get the size of an image as 4-element array */
PHP_MINIT_FUNCTION(exif)
{
	ZEND_INIT_MODULE_GLOBALS(exif, php_exif_init_globals, NULL);
	REGISTER_INI_ENTRIES();
	REGISTER_LONG_CONSTANT("EXIF_USE_MBSTRING", EXIF_USE_MBSTRING, CONST_CS | CONST_PERSISTENT); 
	return SUCCESS;
}
/* }}} */

/* {{{ PHP_MSHUTDOWN_FUNCTION
 */
PHP_MSHUTDOWN_FUNCTION(exif)
{
	UNREGISTER_INI_ENTRIES();
	return SUCCESS;
}
/* }}} */

/* {{{ exif_module_entry
 */
zend_module_entry exif_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
	STANDARD_MODULE_HEADER,
#endif
	"exif",
	exif_functions,
	PHP_MINIT(exif), 
	PHP_MSHUTDOWN(exif),
	NULL, NULL,
	PHP_MINFO(exif),
#if ZEND_MODULE_API_NO >= 20010901
	EXIF_VERSION,
#endif
	STANDARD_MODULE_PROPERTIES
};
/* }}} */

#ifdef COMPILE_DL_EXIF
ZEND_GET_MODULE(exif)
#endif

/* {{{ php_strnlen
 * get length of string if buffer if less than buffer size or buffer size */
static size_t php_strnlen(char* str, size_t maxlen) {
	size_t len = 0;

	if (str && maxlen && *str) {
		do {
			len++;
		} while (--maxlen && *(++str));
	}
	return len;
}
/* }}} */

/* {{{ error messages
*/
static const char * EXIF_ERROR_FILEEOF   = "Unexpected end of file reached";
static const char * EXIF_ERROR_CORRUPT   = "File structure corrupted";
static const char * EXIF_ERROR_THUMBEOF  = "Thumbnail goes IFD boundary or end of file reached";
static const char * EXIF_ERROR_FSREALLOC = "Illegal reallocating of undefined file section";

#define EXIF_ERRLOG_FILEEOF    php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", EXIF_ERROR_FILEEOF);
#define EXIF_ERRLOG_CORRUPT    php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", EXIF_ERROR_CORRUPT);
#define EXIF_ERRLOG_THUMBEOF   php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", EXIF_ERROR_THUMBEOF);
#define EXIF_ERRLOG_FSREALLOC  php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", EXIF_ERROR_FSREALLOC);
/* }}} */

/* {{{ format description defines
   Describes format descriptor
*/
static int php_tiff_bytes_per_format[] = {0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8, 1};
#define NUM_FORMATS 13

#define TAG_FMT_BYTE       1
#define TAG_FMT_STRING     2
#define TAG_FMT_USHORT     3
#define TAG_FMT_ULONG      4
#define TAG_FMT_URATIONAL  5
#define TAG_FMT_SBYTE      6
#define TAG_FMT_UNDEFINED  7
#define TAG_FMT_SSHORT     8
#define TAG_FMT_SLONG      9
#define TAG_FMT_SRATIONAL 10
#define TAG_FMT_SINGLE    11
#define TAG_FMT_DOUBLE    12
#define TAG_FMT_IFD       13

#ifdef EXIF_DEBUG
static char *exif_get_tagformat(int format)
{
	switch(format) {
		case TAG_FMT_BYTE:      return "BYTE";
		case TAG_FMT_STRING:    return "STRING";
		case TAG_FMT_USHORT:    return "USHORT";
		case TAG_FMT_ULONG:     return "ULONG";
		case TAG_FMT_URATIONAL: return "URATIONAL";
		case TAG_FMT_SBYTE:     return "SBYTE";
		case TAG_FMT_UNDEFINED: return "UNDEFINED";
		case TAG_FMT_SSHORT:    return "SSHORT";
		case TAG_FMT_SLONG:     return "SLONG";
		case TAG_FMT_SRATIONAL: return "SRATIONAL";
		case TAG_FMT_SINGLE:    return "SINGLE";
		case TAG_FMT_DOUBLE:    return "DOUBLE";
		case TAG_FMT_IFD:       return "IFD";
	}
	return "*Illegal";
}
#endif

/* Describes tag values */
#define TAG_GPS_VERSION_ID              0x0000
#define TAG_GPS_LATITUDE_REF            0x0001
#define TAG_GPS_LATITUDE                0x0002
#define TAG_GPS_LONGITUDE_REF           0x0003
#define TAG_GPS_LONGITUDE               0x0004
#define TAG_GPS_ALTITUDE_REF            0x0005
#define TAG_GPS_ALTITUDE                0x0006
#define TAG_GPS_TIME_STAMP              0x0007
#define TAG_GPS_SATELLITES              0x0008
#define TAG_GPS_STATUS                  0x0009
#define TAG_GPS_MEASURE_MODE            0x000A
#define TAG_GPS_DOP                     0x000B
#define TAG_GPS_SPEED_REF               0x000C
#define TAG_GPS_SPEED                   0x000D
#define TAG_GPS_TRACK_REF               0x000E
#define TAG_GPS_TRACK                   0x000F
#define TAG_GPS_IMG_DIRECTION_REF       0x0010
#define TAG_GPS_IMG_DIRECTION           0x0011
#define TAG_GPS_MAP_DATUM               0x0012
#define TAG_GPS_DEST_LATITUDE_REF       0x0013
#define TAG_GPS_DEST_LATITUDE           0x0014
#define TAG_GPS_DEST_LONGITUDE_REF      0x0015
#define TAG_GPS_DEST_LONGITUDE          0x0016
#define TAG_GPS_DEST_BEARING_REF        0x0017
#define TAG_GPS_DEST_BEARING            0x0018
#define TAG_GPS_DEST_DISTANCE_REF       0x0019
#define TAG_GPS_DEST_DISTANCE           0x001A
#define TAG_GPS_PROCESSING_METHOD       0x001B
#define TAG_GPS_AREA_INFORMATION        0x001C
#define TAG_GPS_DATE_STAMP              0x001D
#define TAG_GPS_DIFFERENTIAL            0x001E
#define TAG_TIFF_COMMENT                0x00FE /* SHOUDLNT HAPPEN */
#define TAG_NEW_SUBFILE                 0x00FE /* New version of subfile tag */
#define TAG_SUBFILE_TYPE                0x00FF /* Old version of subfile tag */
#define TAG_IMAGEWIDTH                  0x0100
#define TAG_IMAGEHEIGHT                 0x0101
#define TAG_BITS_PER_SAMPLE             0x0102
#define TAG_COMPRESSION                 0x0103
#define TAG_PHOTOMETRIC_INTERPRETATION  0x0106
#define TAG_TRESHHOLDING                0x0107
#define TAG_CELL_WIDTH                  0x0108
#define TAG_CELL_HEIGHT                 0x0109
#define TAG_FILL_ORDER                  0x010A
#define TAG_DOCUMENT_NAME               0x010D
#define TAG_IMAGE_DESCRIPTION           0x010E
#define TAG_MAKE                        0x010F
#define TAG_MODEL                       0x0110
#define TAG_STRIP_OFFSETS               0x0111
#define TAG_ORIENTATION                 0x0112
#define TAG_SAMPLES_PER_PIXEL           0x0115
#define TAG_ROWS_PER_STRIP              0x0116
#define TAG_STRIP_BYTE_COUNTS           0x0117
#define TAG_MIN_SAMPPLE_VALUE           0x0118
#define TAG_MAX_SAMPLE_VALUE            0x0119
#define TAG_X_RESOLUTION                0x011A
#define TAG_Y_RESOLUTION                0x011B
#define TAG_PLANAR_CONFIGURATION        0x011C
#define TAG_PAGE_NAME                   0x011D
#define TAG_X_POSITION                  0x011E
#define TAG_Y_POSITION                  0x011F
#define TAG_FREE_OFFSETS                0x0120
#define TAG_FREE_BYTE_COUNTS            0x0121
#define TAG_GRAY_RESPONSE_UNIT          0x0122
#define TAG_GRAY_RESPONSE_CURVE         0x0123
#define TAG_RESOLUTION_UNIT             0x0128
#define TAG_PAGE_NUMBER                 0x0129
#define TAG_TRANSFER_FUNCTION           0x012D
#define TAG_SOFTWARE                    0x0131
#define TAG_DATETIME                    0x0132
#define TAG_ARTIST                      0x013B
#define TAG_HOST_COMPUTER               0x013C
#define TAG_PREDICTOR                   0x013D
#define TAG_WHITE_POINT                 0x013E
#define TAG_PRIMARY_CHROMATICITIES      0x013F
#define TAG_COLOR_MAP                   0x0140
#define TAG_HALFTONE_HINTS              0x0141
#define TAG_TILE_WIDTH                  0x0142
#define TAG_TILE_LENGTH                 0x0143
#define TAG_TILE_OFFSETS                0x0144
#define TAG_TILE_BYTE_COUNTS            0x0145
#define TAG_SUB_IFD                     0x014A
#define TAG_INK_SETMPUTER               0x014C
#define TAG_INK_NAMES                   0x014D
#define TAG_NUMBER_OF_INKS              0x014E
#define TAG_DOT_RANGE                   0x0150
#define TAG_TARGET_PRINTER              0x0151
#define TAG_EXTRA_SAMPLE                0x0152
#define TAG_SAMPLE_FORMAT               0x0153
#define TAG_S_MIN_SAMPLE_VALUE          0x0154
#define TAG_S_MAX_SAMPLE_VALUE          0x0155
#define TAG_TRANSFER_RANGE              0x0156
#define TAG_JPEG_TABLES                 0x015B
#define TAG_JPEG_PROC                   0x0200
#define TAG_JPEG_INTERCHANGE_FORMAT     0x0201
#define TAG_JPEG_INTERCHANGE_FORMAT_LEN 0x0202
#define TAG_JPEG_RESTART_INTERVAL       0x0203
#define TAG_JPEG_LOSSLESS_PREDICTOR     0x0205
#define TAG_JPEG_POINT_TRANSFORMS       0x0206
#define TAG_JPEG_Q_TABLES               0x0207
#define TAG_JPEG_DC_TABLES              0x0208
#define TAG_JPEG_AC_TABLES              0x0209
#define TAG_YCC_COEFFICIENTS            0x0211
#define TAG_YCC_SUB_SAMPLING            0x0212
#define TAG_YCC_POSITIONING             0x0213
#define TAG_REFERENCE_BLACK_WHITE       0x0214
/* 0x0301 - 0x0302 */
/* 0x0320 */
/* 0x0343 */
/* 0x5001 - 0x501B */
/* 0x5021 - 0x503B */
/* 0x5090 - 0x5091 */
/* 0x5100 - 0x5101 */
/* 0x5110 - 0x5113 */
/* 0x80E3 - 0x80E6 */
/* 0x828d - 0x828F */