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image.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) 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: |
| https://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: Rasmus Lerdorf <rasmus@php.net> |
| Marcus Boerger <helly@php.net> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include <stdio.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "fopen_wrappers.h"
#include "ext/standard/fsock.h"
#include "libavifinfo/avifinfo.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "php_image.h"
#if defined(HAVE_ZLIB) && !defined(COMPILE_DL_ZLIB)
#include "zlib.h"
#endif
/* file type markers */
PHPAPI const char php_sig_gif[3] = {'G', 'I', 'F'};
PHPAPI const char php_sig_psd[4] = {'8', 'B', 'P', 'S'};
PHPAPI const char php_sig_bmp[2] = {'B', 'M'};
PHPAPI const char php_sig_swf[3] = {'F', 'W', 'S'};
PHPAPI const char php_sig_swc[3] = {'C', 'W', 'S'};
PHPAPI const char php_sig_jpg[3] = {(char) 0xff, (char) 0xd8, (char) 0xff};
PHPAPI const char php_sig_png[8] = {(char) 0x89, (char) 0x50, (char) 0x4e, (char) 0x47,
(char) 0x0d, (char) 0x0a, (char) 0x1a, (char) 0x0a};
PHPAPI const char php_sig_tif_ii[4] = {'I','I', (char)0x2A, (char)0x00};
PHPAPI const char php_sig_tif_mm[4] = {'M','M', (char)0x00, (char)0x2A};
PHPAPI const char php_sig_jpc[3] = {(char)0xff, (char)0x4f, (char)0xff};
PHPAPI const char php_sig_jp2[12] = {(char)0x00, (char)0x00, (char)0x00, (char)0x0c,
(char)0x6a, (char)0x50, (char)0x20, (char)0x20,
(char)0x0d, (char)0x0a, (char)0x87, (char)0x0a};
PHPAPI const char php_sig_iff[4] = {'F','O','R','M'};
PHPAPI const char php_sig_ico[4] = {(char)0x00, (char)0x00, (char)0x01, (char)0x00};
PHPAPI const char php_sig_riff[4] = {'R', 'I', 'F', 'F'};
PHPAPI const char php_sig_webp[4] = {'W', 'E', 'B', 'P'};
/* REMEMBER TO ADD MIME-TYPE TO FUNCTION php_image_type_to_mime_type */
/* PCX must check first 64bytes and byte 0=0x0a and byte2 < 0x06 */
/* return info as a struct, to make expansion easier */
struct gfxinfo {
unsigned int width;
unsigned int height;
unsigned int bits;
unsigned int channels;
};
/* {{{ php_handle_gif
* routine to handle GIF files. If only everything were that easy... ;} */
static struct gfxinfo *php_handle_gif (php_stream * stream)
{
struct gfxinfo *result = NULL;
unsigned char dim[5];
if (php_stream_seek(stream, 3, SEEK_CUR))
return NULL;
if (php_stream_read(stream, (char*)dim, sizeof(dim)) != sizeof(dim))
return NULL;
result = (struct gfxinfo *) ecalloc(1, sizeof(struct gfxinfo));
result->width = (unsigned int)dim[0] | (((unsigned int)dim[1])<<8);
result->height = (unsigned int)dim[2] | (((unsigned int)dim[3])<<8);
result->bits = dim[4]&0x80 ? ((((unsigned int)dim[4])&0x07) + 1) : 0;
result->channels = 3; /* always */
return result;
}
/* }}} */
/* {{{ php_handle_psd */
static struct gfxinfo *php_handle_psd (php_stream * stream)
{
struct gfxinfo *result = NULL;
unsigned char dim[8];
if (php_stream_seek(stream, 11, SEEK_CUR))
return NULL;
if (php_stream_read(stream, (char*)dim, sizeof(dim)) != sizeof(dim))
return NULL;
result = (struct gfxinfo *) ecalloc(1, sizeof(struct gfxinfo));
result->height = (((unsigned int)dim[0]) << 24) + (((unsigned int)dim[1]) << 16) + (((unsigned int)dim[2]) << 8) + ((unsigned int)dim[3]);
result->width = (((unsigned int)dim[4]) << 24) + (((unsigned int)dim[5]) << 16) + (((unsigned int)dim[6]) << 8) + ((unsigned int)dim[7]);
return result;
}
/* }}} */
/* {{{ php_handle_bmp */
static struct gfxinfo *php_handle_bmp (php_stream * stream)
{
struct gfxinfo *result = NULL;
unsigned char dim[16];
int size;
if (php_stream_seek(stream, 11, SEEK_CUR))
return NULL;
if (php_stream_read(stream, (char*)dim, sizeof(dim)) != sizeof(dim))
return NULL;
size = (((unsigned int)dim[ 3]) << 24) + (((unsigned int)dim[ 2]) << 16) + (((unsigned int)dim[ 1]) << 8) + ((unsigned int) dim[ 0]);
if (size == 12) {
result = (struct gfxinfo *) ecalloc (1, sizeof(struct gfxinfo));
result->width = (((unsigned int)dim[ 5]) << 8) + ((unsigned int) dim[ 4]);
result->height = (((unsigned int)dim[ 7]) << 8) + ((unsigned int) dim[ 6]);
result->bits = ((unsigned int)dim[11]);
} else if (size > 12 && (size <= 64 || size == 108 || size == 124)) {
result = (struct gfxinfo *) ecalloc (1, sizeof(struct gfxinfo));
result->width = (((unsigned int)dim[ 7]) << 24) + (((unsigned int)dim[ 6]) << 16) + (((unsigned int)dim[ 5]) << 8) + ((unsigned int) dim[ 4]);
result->height = (((unsigned int)dim[11]) << 24) + (((unsigned int)dim[10]) << 16) + (((unsigned int)dim[ 9]) << 8) + ((unsigned int) dim[ 8]);
result->height = abs((int32_t)result->height);
result->bits = (((unsigned int)dim[15]) << 8) + ((unsigned int)dim[14]);
} else {
return NULL;
}
return result;
}
/* }}} */
/* {{{ php_swf_get_bits
* routines to handle SWF files. */
static unsigned long int php_swf_get_bits (unsigned char* buffer, unsigned int pos, unsigned int count)
{
unsigned int loop;
unsigned long int result = 0;
for (loop = pos; loop < pos + count; loop++)
{
result = result +
((((buffer[loop / 8]) >> (7 - (loop % 8))) & 0x01) << (count - (loop - pos) - 1));
}
return result;
}
/* }}} */
#if defined(HAVE_ZLIB) && !defined(COMPILE_DL_ZLIB)
/* {{{ php_handle_swc */
static struct gfxinfo *php_handle_swc(php_stream * stream)
{
struct gfxinfo *result = NULL;
long bits;
unsigned char a[64];
unsigned long len=64, szlength;
int factor = 1,maxfactor = 1 << 15;
int status = 0;
unsigned char *b, *buf = NULL;
zend_string *bufz;
if (php_stream_seek(stream, 5, SEEK_CUR)) {
return NULL;
}
if (php_stream_read(stream, (char *) a, sizeof(a)) != sizeof(a)) {
return NULL;
}
b = ecalloc(1, len + 1);
if (uncompress(b, &len, a, sizeof(a)) != Z_OK) {
/* failed to decompress the file, will try reading the rest of the file */
if (php_stream_seek(stream, 8, SEEK_SET)) {
efree(b);
return NULL;
}
bufz = php_stream_copy_to_mem(stream, PHP_STREAM_COPY_ALL, 0);
if (!bufz) {
efree(b);
return NULL;
}
/*
* zlib::uncompress() wants to know the output data length
* if none was given as a parameter
* we try from input length * 2 up to input length * 2^15
* doubling it whenever it wasn't big enough
* that should be enough for all real life cases
*/
do {
factor <<= 1;
if (ZSTR_LEN(bufz) > ULONG_MAX / factor) {
status = Z_MEM_ERROR;
break;
}
szlength = (unsigned long) (ZSTR_LEN(bufz) * factor);
buf = erealloc(buf, szlength);
status = uncompress(buf, &szlength, (unsigned char *) ZSTR_VAL(bufz), (unsigned long) ZSTR_LEN(bufz));
} while ((status==Z_BUF_ERROR)&&(factor<maxfactor));
if (bufz) {
zend_string_release_ex(bufz, 0);
}
if (status == Z_OK) {
memcpy(b, buf, len);
}
if (buf) {
efree(buf);
}
}
if (!status) {
result = (struct gfxinfo *) ecalloc (1, sizeof (struct gfxinfo));
bits = php_swf_get_bits (b, 0, 5);
result->width = (php_swf_get_bits (b, 5 + bits, bits) -
php_swf_get_bits (b, 5, bits)) / 20;
result->height = (php_swf_get_bits (b, 5 + (3 * bits), bits) -
php_swf_get_bits (b, 5 + (2 * bits), bits)) / 20;
} else {
result = NULL;
}
efree (b);
return result;
}
/* }}} */
#endif
/* {{{ php_handle_swf */
static struct gfxinfo *php_handle_swf (php_stream * stream)
{
struct gfxinfo *result = NULL;
long bits;
unsigned char a[32];
if (php_stream_seek(stream, 5, SEEK_CUR))
return NULL;
if (php_stream_read(stream, (char*)a, sizeof(a)) != sizeof(a))
return NULL;
result = (struct gfxinfo *) ecalloc (1, sizeof (struct gfxinfo));
bits = php_swf_get_bits (a, 0, 5);
result->width = (php_swf_get_bits (a, 5 + bits, bits) -
php_swf_get_bits (a, 5, bits)) / 20;
result->height = (php_swf_get_bits (a, 5 + (3 * bits), bits) -
php_swf_get_bits (a, 5 + (2 * bits), bits)) / 20;
result->bits = 0;
result->channels = 0;
return result;
}
/* }}} */
/* {{{ php_handle_png
* routine to handle PNG files */
static struct gfxinfo *php_handle_png (php_stream * stream)
{
struct gfxinfo *result = NULL;
unsigned char dim[9];
/* Width: 4 bytes
* Height: 4 bytes
* Bit depth: 1 byte
* Color type: 1 byte
* Compression method: 1 byte
* Filter method: 1 byte
* Interlace method: 1 byte
*/
if (php_stream_seek(stream, 8, SEEK_CUR))
return NULL;
if((php_stream_read(stream, (char*)dim, sizeof(dim))) < sizeof(dim))
return NULL;
result = (struct gfxinfo *) ecalloc(1, sizeof(struct gfxinfo));
result->width = (((unsigned int)dim[0]) << 24) + (((unsigned int)dim[1]) << 16) + (((unsigned int)dim[2]) << 8) + ((unsigned int)dim[3]);
result->height = (((unsigned int)dim[4]) << 24) + (((unsigned int)dim[5]) << 16) + (((unsigned int)dim[6]) << 8) + ((unsigned int)dim[7]);
result->bits = (unsigned int)dim[8];
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
#define M_COM 0xFE /* COMment */
#define M_PSEUDO 0xFFD8 /* pseudo marker for start of image(byte 0) */
/* {{{ php_read2 */
static unsigned short php_read2(php_stream * stream)
{
unsigned char a[2];
/* return 0 if we couldn't read enough data */
if((php_stream_read(stream, (char *) a, sizeof(a))) < sizeof(a)) return 0;
return (((unsigned short)a[0]) << 8) + ((unsigned short)a[1]);
}
/* }}} */
/* {{{ php_next_marker
* get next marker byte from file */
static unsigned int php_next_marker(php_stream * stream, int last_marker, int ff_read)
{
int a=0, marker;
/* get marker byte, swallowing possible padding */
if (!ff_read) {
size_t extraneous = 0;
while ((marker = php_stream_getc(stream)) != 0xff) {
if (marker == EOF) {
return M_EOI;/* we hit EOF */
}
extraneous++;
}
if (extraneous) {
php_error_docref(NULL, E_WARNING, "Corrupt JPEG data: %zu extraneous bytes before marker", extraneous);
}
}
a = 1;
do {
if ((marker = php_stream_getc(stream)) == EOF)
{
return M_EOI;/* we hit EOF */
}
a++;
} while (marker == 0xff);
if (a < 2)
{
return M_EOI; /* at least one 0xff is needed before marker code */
}
return (unsigned int)marker;
}
/* }}} */
/* {{{ php_skip_variable
* skip over a variable-length block; assumes proper length marker */
static int php_skip_variable(php_stream * stream)
{
zend_off_t length = ((unsigned int)php_read2(stream));
if (length < 2) {
return 0;
}
length = length - 2;
php_stream_seek(stream, (zend_long)length, SEEK_CUR);
return 1;
}
/* }}} */
static size_t php_read_stream_all_chunks(php_stream *stream, char *buffer, size_t length)
{
size_t read_total = 0;
do {
ssize_t read_now = php_stream_read(stream, buffer, length - read_total);
read_total += read_now;
if (read_now < stream->chunk_size && read_total != length) {
return 0;
}
} while (read_total < length);
return read_total;
}
/* {{{ php_read_APP */
static int php_read_APP(php_stream * stream, unsigned int marker, zval *info)
{
size_t length;
char *buffer;
char markername[16];
zval *tmp;
length = php_read2(stream);
if (length < 2) {
return 0;
}
length -= 2; /* length includes itself */
buffer = emalloc(length);
if (php_read_stream_all_chunks(stream, buffer, length) != length) {
efree(buffer);
return 0;
}
snprintf(markername, sizeof(markername), "APP%d", marker - M_APP0);
if ((tmp = zend_hash_str_find(Z_ARRVAL_P(info), markername, strlen(markername))) == NULL) {
/* XXX we only catch the 1st tag of it's kind! */
add_assoc_stringl(info, markername, buffer, length);
}
efree(buffer);
return 1;
}
/* }}} */
/* {{{ php_handle_jpeg
main loop to parse JPEG structure */
static struct gfxinfo *php_handle_jpeg (php_stream * stream, zval *info)
{
struct gfxinfo *result = NULL;
unsigned int marker = M_PSEUDO;
unsigned short length, ff_read=1;
for (;;) {
marker = php_next_marker(stream, marker, ff_read);
ff_read = 0;
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));
length = php_read2(stream);
result->bits = php_stream_getc(stream);
result->height = php_read2(stream);
result->width = php_read2(stream);
result->channels = php_stream_getc(stream);
if (!info || length < 8) { /* if we don't want an extanded info -> return */
return result;
}
if (php_stream_seek(stream, length - 8, SEEK_CUR)) { /* file error after info */
return result;
}
} else {
if (!php_skip_variable(stream)) {
return result;
}
}
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) {
if (!php_read_APP(stream, marker, info)) { /* read all the app marks... */
return result;
}
} else {
if (!php_skip_variable(stream)) {
return result;
}
}
break;
case M_SOS:
case M_EOI:
return result; /* we're about to hit image data, or are at EOF. stop processing. */
default:
if (!php_skip_variable(stream)) { /* anything else isn't interesting */
return result;
}
break;
}
}
return result; /* perhaps image broken -> no info but size */
}
/* }}} */
/* {{{ php_read4 */
static unsigned int php_read4(php_stream * stream)
{
unsigned char a[4];
/* just return 0 if we hit the end-of-file */
if ((php_stream_read(stream, (char*)a, sizeof(a))) != sizeof(a)) return 0;
return (((unsigned int)a[0]) << 24)
+ (((unsigned int)a[1]) << 16)
+ (((unsigned int)a[2]) << 8)
+ (((unsigned int)a[3]));
}
/* }}} */
/* {{{ JPEG 2000 Marker Codes */
#define JPEG2000_MARKER_PREFIX 0xFF /* All marker codes start with this */
#define JPEG2000_MARKER_SOC 0x4F /* Start of Codestream */
#define JPEG2000_MARKER_SOT 0x90 /* Start of Tile part */
#define JPEG2000_MARKER_SOD 0x93 /* Start of Data */
#define JPEG2000_MARKER_EOC 0xD9 /* End of Codestream */
#define JPEG2000_MARKER_SIZ 0x51 /* Image and tile size */
#define JPEG2000_MARKER_COD 0x52 /* Coding style default */
#define JPEG2000_MARKER_COC 0x53 /* Coding style component */
#define JPEG2000_MARKER_RGN 0x5E /* Region of interest */
#define JPEG2000_MARKER_QCD 0x5C /* Quantization default */
#define JPEG2000_MARKER_QCC 0x5D /* Quantization component */
#define JPEG2000_MARKER_POC 0x5F /* Progression order change */
#define JPEG2000_MARKER_TLM 0x55 /* Tile-part lengths */
#define JPEG2000_MARKER_PLM 0x57 /* Packet length, main header */
#define JPEG2000_MARKER_PLT 0x58 /* Packet length, tile-part header */
#define JPEG2000_MARKER_PPM 0x60 /* Packed packet headers, main header */
#define JPEG2000_MARKER_PPT 0x61 /* Packed packet headers, tile part header */
#define JPEG2000_MARKER_SOP 0x91 /* Start of packet */
#define JPEG2000_MARKER_EPH 0x92 /* End of packet header */
#define JPEG2000_MARKER_CRG 0x63 /* Component registration */
#define JPEG2000_MARKER_COM 0x64 /* Comment */
/* }}} */
/* {{{ php_handle_jpc
Main loop to parse JPEG2000 raw codestream structure */
static struct gfxinfo *php_handle_jpc(php_stream * stream)
{
struct gfxinfo *result = NULL;
int highest_bit_depth, bit_depth;
unsigned char first_marker_id;
unsigned int i;
/* JPEG 2000 components can be vastly different from one another.
Each component can be sampled at a different resolution, use
a different colour space, have a separate colour depth, and
be compressed totally differently! This makes giving a single
"bit depth" answer somewhat problematic. For this implementation
we'll use the highest depth encountered. */
/* Get the single byte that remains after the file type identification */
first_marker_id = php_stream_getc(stream);
/* Ensure that this marker is SIZ (as is mandated by the standard) */
if (first_marker_id != JPEG2000_MARKER_SIZ) {
php_error_docref(NULL, E_WARNING, "JPEG2000 codestream corrupt(Expected SIZ marker not found after SOC)");
return NULL;
}
result = (struct gfxinfo *)ecalloc(1, sizeof(struct gfxinfo));
php_read2(stream); /* Lsiz */
php_read2(stream); /* Rsiz */
result->width = php_read4(stream); /* Xsiz */
result->height = php_read4(stream); /* Ysiz */
#ifdef MBO_0
php_read4(stream); /* XOsiz */
php_read4(stream); /* YOsiz */
php_read4(stream); /* XTsiz */
php_read4(stream); /* YTsiz */
php_read4(stream); /* XTOsiz */
php_read4(stream); /* YTOsiz */
#else
if (php_stream_seek(stream, 24, SEEK_CUR)) {
efree(result);
return NULL;
}
#endif
result->channels = php_read2(stream); /* Csiz */
if ((result->channels == 0 && php_stream_eof(stream)) || result->channels > 256) {
efree(result);
return NULL;
}
/* Collect bit depth info */
highest_bit_depth = 0;
for (i = 0; i < result->channels; i++) {
bit_depth = php_stream_getc(stream); /* Ssiz[i] */
bit_depth++;
if (bit_depth > highest_bit_depth) {
highest_bit_depth = bit_depth;
}
php_stream_getc(stream); /* XRsiz[i] */
php_stream_getc(stream); /* YRsiz[i] */
}
result->bits = highest_bit_depth;
return result;
}
/* }}} */
/* {{{ php_handle_jp2
main loop to parse JPEG 2000 JP2 wrapper format structure */
static struct gfxinfo *php_handle_jp2(php_stream *stream)
{
struct gfxinfo *result = NULL;
unsigned int box_length;
unsigned int box_type;
char jp2c_box_id[] = {(char)0x6a, (char)0x70, (char)0x32, (char)0x63};
/* JP2 is a wrapper format for JPEG 2000. Data is contained within "boxes".
Boxes themselves can be contained within "super-boxes". Super-Boxes can
contain super-boxes which provides us with a hierarchical storage system.
It is valid for a JP2 file to contain multiple individual codestreams.
We'll just look for the first codestream at the root of the box structure
and handle that.
*/
for (;;)
{
box_length = php_read4(stream); /* LBox */
/* TBox */
if (php_stream_read(stream, (void *)&box_type, sizeof(box_type)) != sizeof(box_type)) {
/* Use this as a general "out of stream" error */
break;
}
if (box_length == 1) {
/* We won't handle XLBoxes */
return NULL;
}
if (!memcmp(&box_type, jp2c_box_id, 4))
{
/* Skip the first 3 bytes to emulate the file type examination */
php_stream_seek(stream, 3, SEEK_CUR);
result = php_handle_jpc(stream);
break;
}
/* Stop if this was the last box */
if ((int)box_length <= 0) {
break;
}
/* Skip over LBox (Which includes both TBox and LBox itself */
if (php_stream_seek(stream, box_length - 8, SEEK_CUR)) {
break;
}
}
if (result == NULL) {
php_error_docref(NULL, E_WARNING, "JP2 file has no codestreams at root level");
}
return result;
}
/* }}} */
/* {{{ tiff constants */
PHPAPI const int php_tiff_bytes_per_format[] = {0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8};
/* uncompressed only */
#define TAG_IMAGEWIDTH 0x0100
#define TAG_IMAGEHEIGHT 0x0101
/* compressed images only */
#define TAG_COMP_IMAGEWIDTH 0xA002
#define TAG_COMP_IMAGEHEIGHT 0xA003
#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
/* }}} */
/* {{{ php_ifd_get16u
* Convert a 16 bit unsigned value from file's native byte order */
static int php_ifd_get16u(void *Short, int motorola_intel)
{
if (motorola_intel) {
return (((unsigned char *)Short)[0] << 8) | ((unsigned char *)Short)[1];
} else {
return (((unsigned char *)Short)[1] << 8) | ((unsigned char *)Short)[0];
}
}
/* }}} */
/* {{{ php_ifd_get16s
* Convert a 16 bit signed value from file's native byte order */
static signed short php_ifd_get16s(void *Short, int motorola_intel)
{
return (signed short)php_ifd_get16u(Short, motorola_intel);
}
/* }}} */
/* {{{ php_ifd_get32s
* Convert a 32 bit signed value from file's native byte order */
static int php_ifd_get32s(void *Long, int motorola_intel)
{
if (motorola_intel) {
return ((unsigned)(((unsigned char *)Long)[0]) << 24) | (((unsigned char *)Long)[1] << 16)
| (((unsigned char *)Long)[2] << 8 ) | (((unsigned char *)Long)[3] << 0 );
} else {
return ((unsigned)(((unsigned char *)Long)[3]) << 24) | (((unsigned char *)Long)[2] << 16)
| (((unsigned char *)Long)[1] << 8 ) | (((unsigned char *)Long)[0] << 0 );
}
}
/* }}} */
/* {{{ php_ifd_get32u
* Convert a 32 bit unsigned value from file's native byte order */
static unsigned php_ifd_get32u(void *Long, int motorola_intel)
{
return (unsigned)php_ifd_get32s(Long, motorola_intel) & 0xffffffff;
}
/* }}} */
/* {{{ php_handle_tiff
main loop to parse TIFF structure */
static struct gfxinfo *php_handle_tiff (php_stream * stream, zval *info, int motorola_intel)
{
struct gfxinfo *result = NULL;
int i, num_entries;
unsigned char *dir_entry;
size_t ifd_size, dir_size, entry_value, width=0, height=0, ifd_addr;
int entry_tag , entry_type;
char *ifd_data, ifd_ptr[4];
if (php_stream_read(stream, ifd_ptr, 4) != 4)
return NULL;
ifd_addr = php_ifd_get32u(ifd_ptr, motorola_intel);
if (php_stream_seek(stream, ifd_addr-8, SEEK_CUR))
return NULL;
ifd_size = 2;
ifd_data = emalloc(ifd_size);
if (php_stream_read(stream, ifd_data, 2) != 2) {
efree(ifd_data);
return NULL;
}
num_entries = php_ifd_get16u(ifd_data, motorola_intel);
dir_size = 2/*num dir entries*/ +12/*length of entry*/*num_entries +4/* offset to next ifd (points to thumbnail or NULL)*/;
ifd_size = dir_size;
ifd_data = erealloc(ifd_data,ifd_size);
if (php_stream_read(stream, ifd_data+2, dir_size-2) != dir_size-2) {
efree(ifd_data);
return NULL;
}
/* now we have the directory we can look how long it should be */
ifd_size = dir_size;
for(i=0;i<num_entries;i++) {
dir_entry = (unsigned char *) ifd_data+2+i*12;
entry_tag = php_ifd_get16u(dir_entry+0, motorola_intel);
entry_type = php_ifd_get16u(dir_entry+2, motorola_intel);
switch(entry_type) {
case TAG_FMT_BYTE:
case TAG_FMT_SBYTE:
entry_value = (size_t)(dir_entry[8]);
break;
case TAG_FMT_USHORT:
entry_value = php_ifd_get16u(dir_entry+8, motorola_intel);
break;
case TAG_FMT_SSHORT:
entry_value = php_ifd_get16s(dir_entry+8, motorola_intel);
break;
case TAG_FMT_ULONG:
entry_value = php_ifd_get32u(dir_entry+8, motorola_intel);
break;
case TAG_FMT_SLONG:
entry_value = php_ifd_get32s(dir_entry+8, motorola_intel);
break;
default:
continue;
}
switch(entry_tag) {
case TAG_IMAGEWIDTH:
case TAG_COMP_IMAGEWIDTH:
width = entry_value;
break;
case TAG_IMAGEHEIGHT:
case TAG_COMP_IMAGEHEIGHT:
height = entry_value;
break;
}
}
efree(ifd_data);
if ( width && height) {
/* not the same when in for-loop */
result = (struct gfxinfo *) ecalloc(1, sizeof(struct gfxinfo));
result->height = height;
result->width = width;
result->bits = 0;
result->channels = 0;
return result;
}
return NULL;
}
/* }}} */
/* {{{ php_handle_psd */
static struct gfxinfo *php_handle_iff(php_stream * stream)
{
struct gfxinfo * result;
unsigned char a[10];
int chunkId;
int size;
short width, height, bits;
if (php_stream_read(stream, (char *) a, 8) != 8) {
return NULL;
}
if (strncmp((char *) a+4, "ILBM", 4) && strncmp((char *) a+4, "PBM ", 4)) {
return NULL;
}
/* loop chunks to find BMHD chunk */
do {
if (php_stream_read(stream, (char*)a, 8) != 8) {
return NULL;
}
chunkId = php_ifd_get32s(a+0, 1);
size = php_ifd_get32s(a+4, 1);
if (size < 0) {
return NULL;
}
if ((size & 1) == 1) {
size++;
}
if (chunkId == 0x424d4844) { /* BMHD chunk */
if (size < 9 || php_stream_read(stream, (char*)a, 9) != 9) {
return NULL;
}
width = php_ifd_get16s(a+0, 1);
height = php_ifd_get16s(a+2, 1);
bits = a[8] & 0xff;
if (width > 0 && height > 0 && bits > 0 && bits < 33) {
result = (struct gfxinfo *) ecalloc(1, sizeof(struct gfxinfo));
result->width = width;
result->height = height;
result->bits = bits;
result->channels = 0;
return result;
}
} else {
if (php_stream_seek(stream, size, SEEK_CUR)) {
return NULL;
}
}
} while (1);
}
/* }}} */
/* {{{ php_get_wbmp
* int WBMP file format type
* byte Header Type
* byte Extended Header
* byte Header Data (type 00 = multibyte)
* byte Header Data (type 11 = name/pairs)
* int Number of columns
* int Number of rows
*/
static int php_get_wbmp(php_stream *stream, struct gfxinfo **result, int check)
{
int i, width = 0, height = 0;
if (php_stream_rewind(stream)) {
return 0;
}
/* get type */
if (php_stream_getc(stream) != 0) {
return 0;
}
/* skip header */
do {
i = php_stream_getc(stream);
if (i < 0) {
return 0;
}
} while (i & 0x80);
/* get width */
do {
i = php_stream_getc(stream);
if (i < 0) {
return 0;
}
width = (width << 7) | (i & 0x7f);
/* maximum valid width for wbmp (although 127 may be a more accurate one) */
if (width > 2048) {
return 0;
}
} while (i & 0x80);
/* get height */
do {
i = php_stream_getc(stream);
if (i < 0) {
return 0;
}
height = (height << 7) | (i & 0x7f);
/* maximum valid height for wbmp (although 127 may be a more accurate one) */
if (height > 2048) {
return 0;
}
} while (i & 0x80);
if (!height || !width) {
return 0;
}
if (!check) {
(*result)->width = width;
(*result)->height = height;
}
return IMAGE_FILETYPE_WBMP;
}
/* }}} */
/* {{{ php_handle_wbmp */
static struct gfxinfo *php_handle_wbmp(php_stream * stream)
{
struct gfxinfo *result = (struct gfxinfo *) ecalloc(1, sizeof(struct gfxinfo));
if (!php_get_wbmp(stream, &result, 0)) {
efree(result);
return NULL;
}
return result;
}
/* }}} */
/* {{{ php_get_xbm */
static int php_get_xbm(php_stream *stream, struct gfxinfo **result)
{
char *fline;
char *iname;
char *type;
int value;
unsigned int width = 0, height = 0;
if (result) {