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 | Posted by AuoroP |  Permalink Reply |
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AuoroP 
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I'm pretty sure my problem isn't my code but how I've built the lib. The problem is I'm calling external C code and I am getting valid data out of it but /some/ of my arguments to it is corrupted.
A common thread in this newsgroup seems to be people calling Extern(Windows). I don't that is me because I call with extern(C) my .lst names are not mangled that way: _tjDecompressHeader2, _tjGetErrorStr, _tjInitDecompress.
Even if you can't help, Thanks for reading this far!
This message is kinda long so here's a TOC
The code
The output
DLL code:
You WANT to be in this mess?
-------=-------=---------------=---------------=-------=-------
The code:
extern(C) tjhandle tjInitDecompress();
extern(C) int tjDecompressHeader2
(
tjhandle handle,
void* jpegBuf,
ulong jpegSize,
int* width,
int* height,
int* jpegSubsamp
);
extern(C) char* tjGetErrorStr();
import std.conv: to;
import std.file: exists, read;
import std.stdio: writeln;
tjhandle dHandle = tjInitDecompress();
writeln("dHandle: ", dHandle);
int width, height, subsamp;
void[] buffer = read("testimg.jpg");
writeln("buffer.ptr: ", buffer.ptr);
writeln("buffer.length: ", buffer.length);
writeln("&width: ", &width);
writeln("&height: ", &height);
writeln("&subsamp: ", &subsamp);
if
(
0 >
tjDecompressHeader2
(
dHandle,
buffer.ptr,
buffer.length,
&width,
&height,
&subsamp
)
)
{
writeln( to!string( tjGetErrorStr() ) );
writeln("testimg.jpg gets me ", buffer.length, "bytes.");
write("width: ", width);
write(" height: ", height);
writeln("subsamp: ", subsamp);
}
-------=-------=---------------=---------------=-------=-------
The output:
dHandle: 5E09F0
buffer.ptr: 2340000
buffer.length: 5764
&width: 18FDC4
&height: 18FDC8
&subsamp: 18FDCC
tjDecompressHeader2(): Invalid argument
testimg.jpg gets me 5764bytes.
width: 0 height: 0subsamp: 0
-------=-------=---------------=---------------=-------=-------
DLL code:
If you wanted to look in the DLL code, it is online here: https://github.com/LibVNC/libvncserver/blob/master/common/turbojpeg.c
DLLEXPORT int DLLCALL tjDecompressHeader2(tjhandle handle,
unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height,
int *jpegSubsamp)
{
int retval=0;
getinstance(handle);
if((this->init&DECOMPRESS)==0)
_throw("tjDecompressHeader2(): Instance has not been initialized for decompression");
if
(
jpegBuf==NULL ||
jpegSize<=0 ||
width==NULL ||
height==NULL||
jpegSubsamp==NULL
)
_throw("tjDecompressHeader2(): Invalid argument");
// .
// .
// .
}
-------=-------=---------------=---------------=-------=-------
You WANT to be in this mess?
If you want to play with this problem yourself then I'll help you recreate it.
I'm using 1.3.1 libjpeg-turbo which can be found here: http://sourceforge.net/projects/libjpeg-turbo/files/1.3.1/libjpeg-turbo-1.3.1-vc.exe/download
I've gotten working .lib files out of the folders lib and bin
Getting a .lib from the DLL in bin is much more straightforward:
IMPLIB /s libTurboJPEG.lib turbojpeg.dll
LIB -l libTurboJPEG.lib
Getting a .lib from lib is tricky but the following gets you turbojpeg.omf.lib:
COFFIMPLIB turbojpeg.lib turbojpeg.omf.lib
ECHO LIB -l turbojpeg.omf.lib
I've tried to use both .lib files and their behavior is the same.
Next up is trying the GCC version with the same recipes: http://sourceforge.net/projects/libjpeg-turbo/files/1.3.1/libjpeg-turbo-1.3.1-gcc.exe/download
The behavior is unchanged.
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