Amongst various extra-validated shallow LibC (and FreeType) wrappers, LibPoppler's vendored Goo library its own C++ classes abstracting files, directories, strings, & time-period measurements. Reimplementing interpretation of format strings.
As well as a common API upon writing JPEG (via LibJPEG), PNG (via LibPNG), TIFF (via LibTiffIO), or NetPBM (manually prepending headers).
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