php-src/ext/standard/image.c
1999-09-02 11:58:23 +00:00

385 lines
9.5 KiB
C

/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997, 1998, 1999 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.0 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_0.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: Rasmus Lerdorf |
+----------------------------------------------------------------------+
*/
/* $Id$ */
/*
* Based on Daniel Schmitt's imageinfo.c which carried the following
* Copyright notice.
*/
/*
* imageinfo.c
*
* Simple routines to extract image width/height data from GIF/JPEG files.
*
* Copyright (c) 1997 Daniel Schmitt, opal online publishing, Bonn, Germany.
*
* Includes code snippets from rdjpgcom.c,
* Copyright (c) 1994-1995 Thomas G. Lane
* from release 6a of the Independent JPEG Group's software.
*
* Legal status: see GNU General Public License version 2 or later.
*
*/
#include "php.h"
#include <stdio.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "fopen-wrappers.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "php_image.h"
/* file type markers */
const char php3_sig_gif[3] =
{'G', 'I', 'F'};
const char php3_sig_jpg[3] =
{(char) 0xff, (char) 0xd8, (char) 0xff};
const char php3_sig_png[8] =
{(char) 0x89, (char) 0x50, (char) 0x4e,
(char) 0x47, (char) 0x0d, (char) 0x0a,
(char) 0x1a, (char) 0x0a};
/* return info as a struct, to make expansion easier */
struct gfxinfo {
unsigned int width;
unsigned int height;
unsigned int bits;
unsigned int channels;
};
/* routine to handle GIF files. If only everything were that easy... ;} */
static struct gfxinfo *php3_handle_gif (FILE *fp)
{
struct gfxinfo *result = NULL;
unsigned char a[2];
result = (struct gfxinfo *) ecalloc(1,sizeof(struct gfxinfo));
fseek(fp, 6L, SEEK_SET);
fread(a,sizeof(a),1,fp);
result->width = (unsigned short)a[0] | (((unsigned short)a[1])<<8);
fread(a,sizeof(a),1,fp);
result->height = (unsigned short)a[0] | (((unsigned short)a[1])<<8);
return result;
}
static unsigned long php3_read4(FILE *fp)
{
unsigned char a[ 4 ];
/* just return 0 if we hit the end-of-file */
if (fread(a,sizeof(a),1,fp) != 1) return 0;
return (((unsigned long) a[ 0 ]) << 24) + (((unsigned long) a[ 1 ]) << 16) + (((unsigned long) a[ 2 ]) << 8) + ((unsigned long) a[ 3 ]);
}
/* routine to handle PNG files. - even easier */
static struct gfxinfo *php3_handle_png(FILE *fp)
{
struct gfxinfo *result = NULL;
unsigned long in_width, in_height;
result = (struct gfxinfo *) ecalloc(1,sizeof(struct gfxinfo));
fseek(fp, 16L, SEEK_SET);
in_width = php3_read4(fp);
in_height = php3_read4(fp);
result->width = (unsigned int) in_width;
result->height = (unsigned int) in_height;
return result;
}
/* routines to handle JPEG data */
/* some defines for the different JPEG block types */
#define M_SOF0 0xC0 /* Start Of Frame N */
#define M_SOF1 0xC1 /* N indicates which compression process */
#define M_SOF2 0xC2 /* Only SOF0-SOF2 are now in common use */
#define M_SOF3 0xC3
#define M_SOF5 0xC5 /* NB: codes C4 and CC are NOT SOF markers */
#define M_SOF6 0xC6
#define M_SOF7 0xC7
#define M_SOF9 0xC9
#define M_SOF10 0xCA
#define M_SOF11 0xCB
#define M_SOF13 0xCD
#define M_SOF14 0xCE
#define M_SOF15 0xCF
#define M_SOI 0xD8
#define M_EOI 0xD9 /* End Of Image (end of datastream) */
#define M_SOS 0xDA /* Start Of Scan (begins compressed data) */
#define M_APP0 0xe0
#define M_APP1 0xe1
#define M_APP2 0xe2
#define M_APP3 0xe3
#define M_APP4 0xe4
#define M_APP5 0xe5
#define M_APP6 0xe6
#define M_APP7 0xe7
#define M_APP8 0xe8
#define M_APP9 0xe9
#define M_APP10 0xea
#define M_APP11 0xeb
#define M_APP12 0xec
#define M_APP13 0xed
#define M_APP14 0xee
#define M_APP15 0xef
static unsigned short php3_read2(FILE *fp)
{
unsigned char a[ 2 ];
/* just return 0 if we hit the end-of-file */
if (fread(a,sizeof(a),1,fp) != 1) return 0;
return (((unsigned short) a[ 0 ]) << 8) + ((unsigned short) a[ 1 ]);
}
static unsigned int php3_next_marker(FILE *fp)
/* get next marker byte from file */
{
int c;
/* skip unimportant stuff */
c = getc(fp);
while (c != 0xff) {
if ((c = getc(fp)) == EOF)
return M_EOI; /* we hit EOF */
}
/* get marker byte, swallowing possible padding */
do {
if ((c = getc(fp)) == EOF)
return M_EOI; /* we hit EOF */
} while (c == 0xff);
return (unsigned int) c;
}
static void php3_skip_variable(FILE *fp)
/* skip over a variable-length block; assumes proper length marker */
{
unsigned short length;
length = php3_read2(fp);
length -= 2; /* length includes itself */
fseek(fp, (long) length, SEEK_CUR); /* skip the header */
}
static void php3_read_APP(FILE *fp,unsigned int marker,pval *info)
{
unsigned short length;
unsigned char *buffer;
unsigned char markername[ 16 ];
length = php3_read2(fp);
length -= 2; /* length includes itself */
buffer = emalloc(length);
if (fread(buffer,length,1,fp) != 1) {
return;
}
sprintf(markername,"APP%d",marker - M_APP0);
add_assoc_stringl(info,markername,buffer,length,1);
efree(buffer);
}
static struct gfxinfo *php3_handle_jpeg(FILE *fp,pval *info)
/* main loop to parse JPEG structure */
{
struct gfxinfo *result = NULL;
unsigned int marker;
fseek(fp, 0L, SEEK_SET); /* position file pointer on SOF */
if (getc(fp) != 0xFF) /* JPEG header... */
return NULL;
if (getc(fp) != M_SOI) /* JPEG header... */
return NULL;
for (;;) {
marker = php3_next_marker(fp);
switch (marker) {
case M_SOF0:
case M_SOF1:
case M_SOF2:
case M_SOF3:
case M_SOF5:
case M_SOF6:
case M_SOF7:
case M_SOF9:
case M_SOF10:
case M_SOF11:
case M_SOF13:
case M_SOF14:
case M_SOF15:
if (result == NULL) {
/* handle SOFn block */
result = (struct gfxinfo *) ecalloc(1,sizeof(struct gfxinfo));
fseek(fp, 2, SEEK_CUR);
result->bits = fgetc(fp);
result->height = php3_read2(fp);
result->width = php3_read2(fp);
result->channels = fgetc(fp);
if (! info) /* if we don't want an extanded info -> return */
return result;
} else {
php3_skip_variable(fp);
}
break;
case M_APP0:
case M_APP1:
case M_APP2:
case M_APP3:
case M_APP4:
case M_APP5:
case M_APP6:
case M_APP7:
case M_APP8:
case M_APP9:
case M_APP10:
case M_APP11:
case M_APP12:
case M_APP13:
case M_APP14:
case M_APP15:
if (info) {
php3_read_APP(fp,marker,info); /* read all the app markes... */
} else {
php3_skip_variable(fp);
}
break;
case M_SOS:
case M_EOI:
return result; /* we're about to hit image data, or are at EOF. stop processing. */
break;
default:
php3_skip_variable(fp); /* anything else isn't interesting */
break;
}
}
return NULL;
}
/* main function */
PHP_FUNCTION(getimagesize)
{
pval *arg1,*info = 0;
FILE *fp;
int itype = 0;
char filetype[3];
char pngtype[8];
char temp[64];
struct gfxinfo *result = NULL;
switch(ARG_COUNT(ht)){
case 1:
if (getParameters(ht, 1, &arg1) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(arg1);
break;
case 2:
if (getParameters(ht, 2, &arg1, &info) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (!ParameterPassedByReference(ht, 2)) {
php_error(E_WARNING, "Array to be filled with values must be passed by reference.");
RETURN_FALSE;
}
pval_destructor(info);
if (array_init(info) == FAILURE) {
return;
}
convert_to_string(arg1);
break;
default:
WRONG_PARAM_COUNT;
break;
}
/* Check open_basedir */
if (_php3_check_open_basedir(arg1->value.str.val)) return;
if ((fp = fopen(arg1->value.str.val,"rb")) == 0) {
php_error(E_WARNING, "Unable to open %s", arg1->value.str.val);
return;
}
fread(filetype,sizeof(filetype),1,fp);
if (!memcmp(filetype, php3_sig_gif, 3)) {
result = php3_handle_gif (fp);
itype = 1;
} else if (!memcmp(filetype, php3_sig_jpg, 3)) {
result = php3_handle_jpeg(fp,info);
itype = 2;
} else if (!memcmp(filetype, php3_sig_png, 3)) {
fseek(fp, 0L, SEEK_SET);
fread(pngtype, sizeof(pngtype), 1, fp);
if (!memcmp(pngtype, php3_sig_png, 8)) {
result = php3_handle_png(fp);
itype = 3;
} else {
php_error(E_WARNING, "PNG file corrupted by ASCII conversion");
}
}
fclose(fp);
if (result) {
if (array_init(return_value) == FAILURE) {
php_error(E_ERROR, "Unable to initialize array");
if (result) efree(result);
return;
}
add_index_long(return_value, 0, result->width);
add_index_long(return_value, 1, result->height);
add_index_long(return_value, 2, itype);
sprintf(temp, "width=\"%d\" height=\"%d\"", result->width, result->height); /* safe */
add_index_string(return_value, 3, temp, 1);
if (result->bits != 0) {
add_assoc_long(return_value,"bits",result->bits);
}
if (result->channels != 0) {
add_assoc_long(return_value,"channels",result->channels);
}
efree(result);
}
}