/usr/include/poppler/UTF.h is in libpoppler-private-dev 0.41.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// UTF.h
//
// This file is licensed under the GPLv2 or later
//
// Copyright (C) 2012 Adrian Johnson <ajohnson@redneon.com>
//
//========================================================================
#ifndef UTF_H
#define UTF_H
#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif
#include "goo/GooString.h"
#include "CharTypes.h"
// Convert a UTF-16 string to a UCS-4
// utf16 - utf16 bytes
// utf16_len - number of UTF-16 characters
// ucs4_out - if not NULL, allocates and returns UCS-4 string. Free with gfree.
// returns number of UCS-4 characters
int UTF16toUCS4(const Unicode *utf16, int utf16_len, Unicode **ucs4_out);
// Convert a PDF Text String to UCS-4
// s - PDF text string
// ucs4 - if the number of UCS-4 characters is > 0, allocates and
// returns UCS-4 string. Free with gfree.
// returns number of UCS-4 characters
int TextStringToUCS4(GooString *textStr, Unicode **ucs4);
// check if UCS-4 character is valid
bool UnicodeIsValid(Unicode ucs4);
#endif
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