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pngchunk_int.hpp
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1// ***************************************************************** -*- C++ -*-
2/*
3 * Copyright (C) 2004-2018 Exiv2 authors
4 * This program is part of the Exiv2 distribution.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
19 */
29 /*
30 File: pngchunk.cpp
31 */
32
33#ifndef PNGCHUNK_INT_HPP_
34#define PNGCHUNK_INT_HPP_
35
36// *****************************************************************************
37// included header files
38#include "types.hpp"
39#include "pngimage.hpp"
40
41// + standard includes
42#include <iosfwd>
43#include <cassert>
44#include <cstdarg>
45
46// *****************************************************************************
47// namespace extensions
48namespace Exiv2 {
49
50// *****************************************************************************
51// class declarations
52 class Image;
53
54 namespace Internal {
55
56// *****************************************************************************
57// class definitions
58
63 class PngChunk {
64 public:
69 tEXt_Chunk = 0,
70 zTXt_Chunk = 1,
71 iTXt_Chunk = 2
72 };
73
74 public:
83 static void decodeIHDRChunk(const DataBuf& data,
84 int* outWidth,
85 int* outHeight);
86
95 static void decodeTXTChunk(Image* pImage,
96 const DataBuf& data,
97 TxtChunkType type);
98
106 static DataBuf decodeTXTChunk(const DataBuf& data,
107 TxtChunkType type);
108
109
116 static DataBuf keyTXTChunk(const DataBuf& data, bool stripHeader=false);
117
126 static std::string makeMetadataChunk(const std::string& metadata,
127 MetadataId type);
128
129 private:
134 static DataBuf parseTXTChunk(const DataBuf& data,
135 int keysize,
136 TxtChunkType type);
137
147 static void parseChunkContent( Image* pImage,
148 const byte* key,
149 long keySize,
150 const DataBuf arr);
151
162 static std::string makeAsciiTxtChunk(const std::string& keyword,
163 const std::string& text,
164 bool compress);
165
174 static std::string makeUtf8TxtChunk(const std::string& keyword,
175 const std::string& text,
176 bool compress);
177
181 static void zlibUncompress(const byte* compressedText,
182 unsigned int compressedTextSize,
183 DataBuf& arr);
184
188 static std::string zlibCompress(const std::string& text);
189
193 static DataBuf readRawProfile(const DataBuf& text,bool iTXt);
194
199 static std::string writeRawProfile(const std::string& profileData,
200 const char* profileType);
201
202 friend class Exiv2::PngImage;
203
204 }; // class PngChunk
205
206}} // namespace Internal, Exiv2
207
208#endif // #ifndef PNGCHUNK_INT_HPP_
Utility class containing a character array. All it does is to take care of memory allocation and dele...
Definition types.hpp:204
Abstract base class defining the interface for an image. This is the top-level interface to the Exiv2...
Definition image.hpp:81
Stateless parser class for data in PNG chunk format. Images use this class to decode and encode PNG-b...
Definition pngchunk_int.hpp:63
static DataBuf decodeTXTChunk(const DataBuf &data, TxtChunkType type)
Decode PNG tEXt, zTXt, or iTXt chunk data from pImage passed by data buffer data and extract Comment,...
static void decodeIHDRChunk(const DataBuf &data, int *outWidth, int *outHeight)
Decode PNG IHDR chunk data from a data buffer data and return image size to outWidth and outHeight.
static DataBuf keyTXTChunk(const DataBuf &data, bool stripHeader=false)
Return PNG TXT chunk key as data buffer.
TxtChunkType
Text Chunk types.
Definition pngchunk_int.hpp:68
static void decodeTXTChunk(Image *pImage, const DataBuf &data, TxtChunkType type)
Decode PNG tEXt, zTXt, or iTXt chunk data from pImage passed by data buffer data and extract Comment,...
static std::string makeMetadataChunk(const std::string &metadata, MetadataId type)
Return a complete PNG chunk data compressed or not as buffer. Data returned is formated accordingly w...
Class to access PNG images. Exif and IPTC metadata are supported directly.
Definition pngimage.hpp:58
Provides classes and functions to encode and decode Exif and Iptc data. The libexiv2 API consists of ...
Definition asfvideo.hpp:36
MetadataId
An identifier for each type of metadata.
Definition types.hpp:119
PNG image, implemented using the following references: PNG specification by W3C PNG tags list by Phi...
Type definitions for Exiv2 and related functionality.