BUG: TIFF over 2Gb

[Sam Fisher]

Environment: 32-bit platform, Visual Studio 2008

I have the TIFF file, which is more than 2Gb
ImageMagick could not process this file, because the blob-related (GetBlobSize, SeekBlob etc) functions uses fstat / fseek.
In the structure stat the field st_size has type signed long.
Therefore, we have error with types casting: long -> MagickSizeType (which means unsigned __int64) - sign expansion
The patch could look like this (checked for VS2008)
(compared IM 6.4.7 and trunk)

blob-private.h:

Code: Select all

4c4
< 
---
>   
7c7
< 
---
>   
9c9
< 
---
>   
63c63
< extern MagickExport const struct __stat64
---
> extern MagickExport const struct stat

blob.c

Code: Select all

119c119
<   struct __stat64
---
>   struct stat
1113c1113
< MagickExport const struct __stat64 *GetBlobProperties(const Image *image)
---
> MagickExport const struct stat *GetBlobProperties(const Image *image)
1165c1165
<       if (_fstat64(fileno(image->blob->file),&image->blob->properties) == 0)
---
>       if (fstat(fileno(image->blob->file),&image->blob->properties) == 0)
1178c1178
<       if (_fstat64(fileno(image->blob->file),&image->blob->properties) == 0)
---
>       if (fstat(fileno(image->blob->file),&image->blob->properties) == 0)
1186c1186
<       if (_fstat64(fileno(image->blob->file),&image->blob->properties) == 0)
---
>       if (fstat(fileno(image->blob->file),&image->blob->properties) == 0)
2362c2362
<        struct __stat64
---
>        struct stat
3277c3277
<       if (_fseeki64(image->blob->file,offset,whence) < 0)
---
>       if (fseek(image->blob->file,(off_t) offset,whence) < 0)
3619c3619
<       offset=_ftelli64(image->blob->file);
---
>       offset=ftell(image->blob->file);

[magick]

We will get your patch into ImageMagick 6.4.7-9 within a day or two. Thanks.