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/usr/include/poppler/CharTypes.h is in libpoppler-dev 0.18.4-1ubuntu3.2.

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//========================================================================
//
// CharTypes.h
//
// Copyright 2001-2003 Glyph & Cog, LLC
//
//========================================================================

#ifndef CHARTYPES_H
#define CHARTYPES_H

// Unicode character.
typedef unsigned int Unicode;

// Character ID for CID character collections.
typedef unsigned int CID;

// This is large enough to hold any of the following:
// - 8-bit char code
// - 16-bit CID
// - Unicode
typedef unsigned int CharCode;

#endif