Mercurial > sdl-ios-xcode
view src/video/bwindow/SDL_sysyuv.h @ 3539:f2846bf19360
Fixed bug #896
John Popplewell 2009-12-08 23:05:50 PST
Originally reported by AKFoerster on the mailing list.
Error decoding UTF8 Russian text to UTF-16LE on Windows, but specifically on
platforms without iconv support (the default on Windows).
Valid UTF8 characters are flagged as being overlong and then substituted by the
UNKNOWN_UNICODE character.
After studying the testiconv.c example program, reading the RFCs and putting
some printf statements in SDL_iconv.c the problem is in a test for 'Maximum
overlong sequences', specifically 4.2.1, which is carried out by the following
code:
} else if ( p[0] >= 0xC0 ) {
if ( (p[0] & 0xE0) != 0xC0 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
if ( (p[0] & 0xCE) == 0xC0 ) { <<<<<<<< here
overlong = SDL_TRUE;
}
ch = (Uint32)(p[0] & 0x1F);
left = 1;
}
} else {
Here is the 2-byte encoding of a character in range 00000080 - 000007FF
110xxxxx 10xxxxxx
The line in question is supposed to be checking for an overlong sequence which
would be less than
11000001 10111111
which should be represented as a single byte.
BUT, the mask value (0xCE) is wrong, it isn't checking the top-most bit:
11000001 value
11001110 mask (incorrect)
^
and should be (0xDE):
11000001 value
11011110 mask (correct)
making the above code:
} else if ( p[0] >= 0xC0 ) {
if ( (p[0] & 0xE0) != 0xC0 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
if ( (p[0] & 0xDE) == 0xC0 ) { <<<<<<<< here
overlong = SDL_TRUE;
}
ch = (Uint32)(p[0] & 0x1F);
left = 1;
}
} else {
I can supply a test program and/or a patch if required,
best regards,
John Popplewell
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 11 Dec 2009 08:03:43 +0000 |
| parents | 99210400e8b9 |
| children | f7b03b6838cb |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" #ifndef __SDL_SYS_YUV_H__ #define __SDL_SYS_YUV_H__ /* This is the BeOS implementation of YUV video overlays */ #include "SDL_video.h" #include "SDL_lowvideo.h" extern "C" { struct private_yuvhwdata { /* FRAMEDATA* CurrentFrameData; FRAMEDATA* FrameData0; FRAMEDATA* FrameData1; PgScalerProps_t props; PgScalerCaps_t caps; PgVideoChannel_t* channel; PhArea_t CurrentViewPort; PhPoint_t CurrentWindowPos; long format; int scaler_on; int current; long YStride; long VStride; long UStride; int ischromakey; long chromakey; int forcedredraw; unsigned long State; long flags; */ SDL_Surface *display; BView *bview; bool first_display; BBitmap *bbitmap; int locked; }; extern BBitmap *BE_GetOverlayBitmap(BRect bounds, color_space cs); extern SDL_Overlay *BE_CreateYUVOverlay(_THIS, int width, int height, Uint32 format, SDL_Surface * display); extern int BE_LockYUVOverlay(_THIS, SDL_Overlay * overlay); extern void BE_UnlockYUVOverlay(_THIS, SDL_Overlay * overlay); extern int BE_DisplayYUVOverlay(_THIS, SDL_Overlay * overlay, SDL_Rect * src, SDL_Rect * dst); extern void BE_FreeYUVOverlay(_THIS, SDL_Overlay * overlay); }; #endif /* __SDL_PH_YUV_H__ */ /* vi: set ts=4 sw=4 expandtab: */