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ne0h
Joined: 21 Feb 2008
Posts: 386
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 Posted: Fri Dec 19, 2008 6:07 am Post subject: Bmp header struct, problem with word align... |
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Hi,
I'm writing a BMP library ( to load BMP files ),
but I'm getting some error with this:
| Code: |
typedef struct
{
u16 magic_value; /** "BM" **/
u32 file_size; /** the size of the BMP file in bytes **/
u32 reserved; /** Reserved **/
u32 rawdataoffset; /** Offset where bmp data can be found **/
} BmpHeader;
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This is the BMP main header structure, and I've tried to load it with this:
| Code: |
[...]
BmpHeader Bmp_Header;
sceIoRead(fd, &Bmp_Header, sizeof(BmpHeader))
[...]
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But when I try to print infos, I get a error because the 3th and the 4th bytes are "jumped", I know that this is probably because GCC what's to word align the structure, so I've tried to printf the size of the structure with sizeof() and I get 16bytes instead of 14...
So can I write a right struct?
I've tried with __attribute__((packed)), but I still get 16 bytes...
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ooPo
Site Admin
Joined: 17 Jan 2004
Posts: 2032
Location: Canada
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| Posted: Fri Dec 19, 2008 6:16 am Post subject: |
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Make sure you're using the packed attribute in the right place. It can be tricky with a typedef:
| Code: | typedef struct
{
(blahblah)
} __attribute__ ((packed)) BmpHeader; |
Does that help? |
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ne0h
Joined: 21 Feb 2008
Posts: 386
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| Posted: Fri Dec 19, 2008 6:23 am Post subject: |
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....mmm.
I've put the attrib in the same place ( if I put it after BmpHeader Gcc has said me that attribute are ignored ) but now works, instead of the last build... :(
Thanks ooPo! :)
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