1//========================================================================
2//
3// CMap.h
4//
5// Copyright 2001-2003 Glyph & Cog, LLC
6//
7//========================================================================
8
9//========================================================================
10//
11// Modified under the Poppler project - http://poppler.freedesktop.org
12//
13// All changes made under the Poppler project to this file are licensed
14// under GPL version 2 or later
15//
16// Copyright (C) 2008 Koji Otani <sho@bbr.jp>
17// Copyright (C) 2009, 2018-2020, 2022 Albert Astals Cid <aacid@kde.org>
18// Copyright (C) 2012, 2017 Adrian Johnson <ajohnson@redneon.com>
19// Copyright (C) 2018 Adam Reichold <adam.reichold@t-online.de>
20//
21// To see a description of the changes please see the Changelog file that
22// came with your tarball or type make ChangeLog if you are building from git
23//
24//========================================================================
25
26#ifndef CMAP_H
27#define CMAP_H
28
29#include <array>
30#include <atomic>
31#include <memory>
32
33#include "poppler-config.h"
34#include "CharTypes.h"
35
36class GooString;
37class Object;
38struct CMapVectorEntry;
39class CMapCache;
40class Stream;
41
42//------------------------------------------------------------------------
43
44class CMap
45{
46public:
47 // Parse a CMap from <obj>, which can be a name or a stream. Sets
48 // the initial reference count to 1. Returns NULL on failure.
49 static std::shared_ptr<CMap> parse(CMapCache *cache, const GooString *collectionA, Object *obj);
50
51 // Create the CMap specified by <collection> and <cMapName>. Sets
52 // the initial reference count to 1. Returns NULL on failure.
53 static std::shared_ptr<CMap> parse(CMapCache *cache, const GooString *collectionA, const GooString *cMapNameA);
54
55 // Parse a CMap from <str>. Sets the initial reference count to 1.
56 // Returns NULL on failure.
57 static std::shared_ptr<CMap> parse(CMapCache *cache, const GooString *collectionA, Stream *str);
58
59 ~CMap();
60
61 CMap(const CMap &) = delete;
62 CMap &operator=(const CMap &) = delete;
63
64 // Return collection name (<registry>-<ordering>).
65 const GooString *getCollection() const { return collection; }
66
67 const GooString *getCMapName() const { return cMapName; }
68
69 // Return true if this CMap matches the specified <collectionA>, and
70 // <cMapNameA>.
71 bool match(const GooString *collectionA, const GooString *cMapNameA);
72
73 // Return the CID corresponding to the character code starting at
74 // <s>, which contains <len> bytes. Sets *<c> to the char code, and
75 // *<nUsed> to the number of bytes used by the char code.
76 CID getCID(const char *s, int len, CharCode *c, int *nUsed);
77
78 // Return the writing mode (0=horizontal, 1=vertical).
79 int getWMode() const { return wMode; }
80
81 void setReverseMap(unsigned int *rmap, unsigned int rmapSize, unsigned int ncand);
82
83private:
84 void parse2(CMapCache *cache, int (*getCharFunc)(void *), void *data);
85 CMap(GooString *collectionA, GooString *cMapNameA);
86 CMap(GooString *collectionA, GooString *cMapNameA, int wModeA);
87 void useCMap(CMapCache *cache, const char *useName);
88 void useCMap(CMapCache *cache, Object *obj);
89 void copyVector(CMapVectorEntry *dest, CMapVectorEntry *src);
90 void addCIDs(unsigned int start, unsigned int end, unsigned int nBytes, CID firstCID);
91 void freeCMapVector(CMapVectorEntry *vec);
92 void setReverseMapVector(unsigned int startCode, CMapVectorEntry *vec, unsigned int *rmap, unsigned int rmapSize, unsigned int ncand);
93
94 GooString *collection;
95 GooString *cMapName;
96 bool isIdent; // true if this CMap is an identity mapping,
97 // or is based on one (via usecmap)
98 int wMode; // writing mode (0=horizontal, 1=vertical)
99 CMapVectorEntry *vector; // vector for first byte (NULL for
100 // identity CMap)
101};
102
103//------------------------------------------------------------------------
104
105#define cMapCacheSize 4
106
107class CMapCache
108{
109public:
110 CMapCache();
111 ~CMapCache() = default;
112
113 CMapCache(const CMapCache &) = delete;
114 CMapCache &operator=(const CMapCache &) = delete;
115
116 // Get the <cMapName> CMap for the specified character collection.
117 // Increments its reference count; there will be one reference for
118 // the cache plus one for the caller of this function.
119 // Stream is a stream containing the CMap, can be NULL and
120 // this means the CMap will be searched in the CMap files
121 // Returns NULL on failure.
122 std::shared_ptr<CMap> getCMap(const GooString *collection, const GooString *cMapName);
123
124private:
125 std::array<std::shared_ptr<CMap>, cMapCacheSize> cache;
126};
127
128#endif
129

source code of poppler/poppler/CMap.h