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// UnicodeMap.h
// Mapping from Unicode to an encoding.
// Copyright 2001-2003 Glyph & Cog, LLC
// Modified under the Poppler project -
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
// Copyright (C) 2017 Adrian Johnson <>
// Copyright (C) 2018 Albert Astals Cid <>
// Copyright (C) 2018 Adam Reichold <>
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
#include "poppler-config.h"
#include "CharTypes.h"
#include <atomic>
class GooString;
enum UnicodeMapKind {
unicodeMapUser, // read from a file
unicodeMapResident, // static list of ranges
unicodeMapFunc // function pointer
typedef int (*UnicodeMapFunc)(Unicode u, char *buf, int bufSize);
struct UnicodeMapRange {
Unicode start, end; // range of Unicode chars
unsigned int code, nBytes; // first output code
struct UnicodeMapExt;
class UnicodeMap {
// Create the UnicodeMap specified by <encodingName>. Sets the
// initial reference count to 1. Returns NULL on failure.
static UnicodeMap *parse(GooString *encodingNameA);
// Create a resident UnicodeMap.
UnicodeMap(const char *encodingNameA, bool unicodeOutA,
UnicodeMapRange *rangesA, int lenA);
// Create a resident UnicodeMap that uses a function instead of a
// list of ranges.
UnicodeMap(const char *encodingNameA, bool unicodeOutA,
UnicodeMapFunc funcA);
UnicodeMap(UnicodeMap &&other) noexcept;
UnicodeMap& operator=(UnicodeMap &&other) noexcept;
void swap(UnicodeMap& other) noexcept;
UnicodeMap(const UnicodeMap &) = delete;
UnicodeMap& operator=(const UnicodeMap &) = delete;
void incRefCnt();
void decRefCnt();
const GooString *getEncodingName() const { return encodingName; }
bool isUnicode() const { return unicodeOut; }
// Return true if this UnicodeMap matches the specified
// <encodingNameA>.
bool match(const GooString *encodingNameA) const;
// Map Unicode to the target encoding. Fills in <buf> with the
// output and returns the number of bytes used. Output will be
// truncated at <bufSize> bytes. No string terminator is written.
// Returns 0 if no mapping is found.
int mapUnicode(Unicode u, char *buf, int bufSize);
UnicodeMap(GooString *encodingNameA);
GooString *encodingName;
UnicodeMapKind kind;
bool unicodeOut;
union {
UnicodeMapRange *ranges; // (user, resident)
UnicodeMapFunc func; // (func)
int len; // (user, resident)
UnicodeMapExt *eMaps; // (user)
int eMapsLen; // (user)
std::atomic_int refCnt;
#define unicodeMapCacheSize 4
class UnicodeMapCache {
UnicodeMapCache(const UnicodeMapCache &) = delete;
UnicodeMapCache& operator=(const UnicodeMapCache &) = delete;
// Get the UnicodeMap for <encodingName>. Increments its reference
// count; there will be one reference for the cache plus one for the
// caller of this function. Returns NULL on failure.
UnicodeMap *getUnicodeMap(GooString *encodingName);
UnicodeMap *cache[unicodeMapCacheSize];