From: willertan1980 at yahoo dot com
Operating system: WinXP sp1
PHP version: 4.3.1
PHP Bug Type: GetImageSize related
Bug description: getimagesize () return incorrect values on bitmap (os2) files
Description:
------------
getimagesize () return incorrect values on bitmap files
SYSTEM PHP 4.3.1(bundled version gd >1.6) , WinXP IIS 5.1 server, Intel P4
CPU
TESTED image : RGB 24bits OS/2 bitmap (BM) generated by Photoshop 7.0
>>HEX DUMP image data 1st 32bytes - bitmaps header 12 bytes
4d 2c d0 01 00 00 00 00 00 1a 00 00 00
0c 00
00 f0 00 a5 00 01 00 18 00 b0 7f 6d a9
75 62
i realized that getimagesize () read OS/2 1.x bitmap by using Windows 3.x
/ OS/2 2.x structure, that is the reason the output was incorrect.
>>DUMP form getimagesize () :
Array ( [0] => 10813680 [1] => 1572865 [2] => 6 [3] => width="10813680"
height="1572865" [bits] => 43373 [mime] => image/bmp )
>>DUMP from my own function, bmp_info () (identical to values that given
by WinXP properties and photoshop 7)
Array ( [width] => 240 [height] => 165 [planes] => 1 [bits] => 24
[bi_type] => Bitmap [bi_hsz] => 12 [bi_htype] => OS/2 1.x [ncolor] =>
16777216 [xdensity] => 96 [ydensity] => 96 [density_mod] => 1 [component]
=> 3 [compression] => 0 )
>>Header for bmp >= Windows 2.x and OS/2 1.x
typedef struct _WinBMPFileHeader, 14 bytes
{
WORD FileType;
DWORD FileSize;
WORD Reserved1;
WORD Reserved2;
DWORD BitmapOffset;
} WINBMPFILEHEADER;
Bitmap Windows 3.x should use this format, always 40 bytes
typedef struct tagBITMAPINFOHEADER{
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
} BITMAPINFOHEADER, *PBITMAPINFOHEADER;
but Bitmap Windows 2.x and OS/2 1.x should read like this, and its always
12 bytes
typedef struct _Win2xBitmapHeader
{
DWORD Size;
SHORT Width;
SHORT Height;
WORD Planes;
WORD BitsPerPixel;
} WIN2XBITMAPHEADER;
REFERENCE
http://netghost.narod.ru/gff/graphics/summary/os2bmp.htm
http://netghost.narod.ru/gff/graphics/summary/micbmp.htm
Windows BITMAPINFO-
http://msdn.microsoft.com/library/en-us/gdi/bitmaps_0zn6.asp?frame=true
Windows BITMAPINFOHEADER-
http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp?frame=true
http://www.fastgraph.com/help/bmp_header_format.html
*please remove this message if outdated or solved
--
Edit bug report at http://bugs.php.net/?id=25581&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=25581&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=25581&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=25581&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=25581&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=25581&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=25581&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=25581&r=support
Expected behavior: http://bugs.php.net/fix.php?id=25581&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=25581&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=25581&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=25581&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=25581&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=25581&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=25581&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=25581&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=25581&r=float
