TIFFWriteDirectory() fails on network drive

TIFFWriteDirectory() fails on network drive

[Hsu, Justine]

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The attached program tries to save a blank 64 x 64 TIFF image to specified path.
When the path specified is local, the images saves fine.
If the path is on a network drive on a Windows7, then it saves a corrupt file, even after applying this hotfix http://support.microsoft.com/kb/2732673 
Here is the relevant code:

        const int dim = 64;
        const int channels = 3;

        TIFF *tif = TIFFOpen(argv[1], "w");
        TIFFSetField(tif, TIFFTAG_IMAGEWIDTH,      dim);
        TIFFSetField(tif, TIFFTAG_IMAGELENGTH,     dim);
        TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, channels);
        TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,    1);
        TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE,   8);
        TIFFSetField(tif, TIFFTAG_PLANARCONFIG,    1);
        TIFFSetField(tif, TIFFTAG_PHOTOMETRIC,     PHOTOMETRIC_RGB);
        TIFFSetField(tif, TIFFTAG_COMPRESSION,     COMPRESSION_LZW);
        
        int i;
        for (i = 0; i < dim; i++)
        {
            TIFFWriteScanline(tif, buf + dim*channels*(dim - i - 1), i, 0);
        }

        TIFFWriteDirectory(tif);
        TIFFClose(tif);

Justine

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#include <stdio.h>
#include <tiffio.h>

int main(int argc, char **argv)
{
    if (argc <= 1)
    {
        printf("need file name\n");
        return 0;
    }
    
    const int dim = 64;
    const int channels = 3;
    const int size = dim * dim * channels;
    char *buf = malloc(size);
    int i = 0;
    for (i = 0; i < size; i++)
        buf[i] = '\0';
    
    TIFF *tif = TIFFOpen(argv[1], "w");
    if (tif == NULL)
        printf("can't open file to write\n");
    else
    {
        TIFFSetField(tif, TIFFTAG_IMAGEWIDTH,      dim);
        TIFFSetField(tif, TIFFTAG_IMAGELENGTH,     dim);
        TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, channels);
        TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,    1);
        TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE,   8);
        TIFFSetField(tif, TIFFTAG_PLANARCONFIG,    1);
        TIFFSetField(tif, TIFFTAG_PHOTOMETRIC,     PHOTOMETRIC_RGB);
        TIFFSetField(tif, TIFFTAG_COMPRESSION,     COMPRESSION_LZW);
        
        int err = 0;
        for (i = 0; i < dim; i++)
        {
            if (TIFFWriteScanline(tif, buf + dim*channels*(dim - i - 1), i, 0) != 1)
                err = -1;
        }

        if (TIFFWriteDirectory(tif) != 1)
            err = -1;
        
        if (err != 0)
            printf("error\n");
            
        TIFFClose(tif);
    }
        
    free(buf);
    return 0;
}

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Re: TIFFWriteDirectory() fails on network drive

[Corinna Vinschen]

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On Jan 31 14:17, Hsu, Justine wrote:
> The attached program tries to save a blank 64 x 64 TIFF image to specified path.
> When the path specified is local, the images saves fine.
> If the path is on a network drive on a Windows7, then it saves a corrupt file, even after applying this hotfix http://support.microsoft.com/kb/2732673 
> Here is the relevant code:
> 
>         const int dim = 64;
>         const int channels = 3;
> 
>         TIFF *tif = TIFFOpen(argv[1], "w");
>         TIFFSetField(tif, TIFFTAG_IMAGEWIDTH,      dim);
>         TIFFSetField(tif, TIFFTAG_IMAGELENGTH,     dim);
>         TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, channels);
>         TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,    1);
>         TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE,   8);
>         TIFFSetField(tif, TIFFTAG_PLANARCONFIG,    1);
>         TIFFSetField(tif, TIFFTAG_PHOTOMETRIC,     PHOTOMETRIC_RGB);
>         TIFFSetField(tif, TIFFTAG_COMPRESSION,     COMPRESSION_LZW);
>         
>         int i;
>         for (i = 0; i < dim; i++)
>         {
>             TIFFWriteScanline(tif, buf + dim*channels*(dim - i - 1), i, 0);
>         }
> 
>         TIFFWriteDirectory(tif);
>         TIFFClose(tif);

And this question is is Cygwin-related, because...?


Corinna

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Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: TIFFWriteDirectory() fails on network drive

[Charles Wilson]

On 1/31/2014 3:38 PM, Corinna Vinschen wrote:
> On Jan 31 14:17, Hsu, Justine wrote:
>> The attached program tries to save a blank 64 x 64 TIFF image to specified path.
>> When the path specified is local, the images saves fine.
>> If the path is on a network drive on a Windows7, then it saves a corrupt file, even after applying this hotfix http://support.microsoft.com/kb/2732673
>> Here is the relevant code:
>>
>>          TIFF *tif = TIFFOpen(argv[1], "w");

Just a hunch, but maybe your local drivers are mounted in unix mode, and 
the remote is mounted in dos mode.  Use "wb" instead of "w"?

--
Chuck


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