C++ LibTiff - Read and Save file from and to Memory

Question

Is there a way in LibTiff how I can read a file from Memory and save it to Memory?

I don\'t want to save the image to the disc first, before opening it with an other

Answer 1

You should create your own read/write/etc. functions and pass them to TIFFClientOpen (not TIFFOpen) function when creating your TIFF.

Example:

TIFF* tif = TIFFClientOpen(
    "Memory", "w", (thandle_t)something_you_will_use_later,
    tiff_Read, tiff_Write, tiff_Seek, tiff_Close, tiff_Size,
    tiff_Map, tiff_Unmap);

And you should also implement following functions (st passed to these functions is the something_you_will_use_later passed to TIFFClientOpen :

tsize_t tiff_Read(thandle_t st,tdata_t buffer,tsize_t size)
{
    ...
};

tsize_t tiff_Write(thandle_t st,tdata_t buffer,tsize_t size)
{
    ...
};

int tiff_Close(thandle_t)
{
    return 0;
};

toff_t tiff_Seek(thandle_t st,toff_t pos, int whence)
{
    if (pos == 0xFFFFFFFF)
       return 0xFFFFFFFF;
    ...
};

toff_t tiff_Size(thandle_t st)
{
    ...
};

int tiff_Map(thandle_t, tdata_t*, toff_t*)
{
    return 0;
};

void tiff_Unmap(thandle_t, tdata_t, toff_t)
{
    return;
};