Tag Parser 11.2.1
C++ library for reading and writing MP4 (iTunes), ID3, Vorbis, Opus, FLAC and Matroska tags
vorbiscommentfield.cpp
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3
4#include "../flac/flacmetadata.h"
5
6#include "../ogg/oggiterator.h"
7
8#include "../id3/id3v2frame.h"
9
10#include "../diagnostics.h"
11#include "../exceptions.h"
12
13#include <c++utilities/conversion/binaryconversion.h>
14#include <c++utilities/conversion/stringbuilder.h>
15#include <c++utilities/conversion/stringconversion.h>
16#include <c++utilities/io/binaryreader.h>
17#include <c++utilities/io/binarywriter.h>
18
19#include <iostream>
20#include <memory>
21
22using namespace std;
23using namespace CppUtilities;
24
25namespace TagParser {
26
36{
37}
38
42VorbisCommentField::VorbisCommentField(const IdentifierType &id, const TagValue &value)
43 : TagField<VorbisCommentField>(id, value)
44{
45}
46
50template <class StreamType> void VorbisCommentField::internalParse(StreamType &stream, std::uint64_t &maxSize, Diagnostics &diag)
51{
52 static const string context("parsing Vorbis comment field");
53 char buff[4];
54 if (maxSize < 4) {
55 diag.emplace_back(DiagLevel::Critical, argsToString("Field expected at ", static_cast<std::streamoff>(stream.tellg()), '.'), context);
57 } else {
58 maxSize -= 4;
59 }
60 stream.read(buff, 4);
61 if (const auto size = LE::toUInt32(buff)) { // read size
62 if (size <= maxSize) {
63 maxSize -= size;
64 // read data
65 auto data = make_unique<char[]>(size);
66 stream.read(data.get(), size);
67 std::uint32_t idSize = 0;
68 for (const char *i = data.get(), *end = data.get() + size; i != end && *i != '='; ++i, ++idSize)
69 ;
70 // extract id
71 setId(string(data.get(), idSize));
72 if (!idSize) {
73 // empty field ID
74 diag.emplace_back(
75 DiagLevel::Critical, argsToString("The field ID at ", static_cast<std::streamoff>(stream.tellg()), " is empty."), context);
76 throw InvalidDataException();
77 } else if (id() == VorbisCommentIds::cover()) {
78 // extract cover value
79 try {
80 auto decoded = decodeBase64(data.get() + idSize + 1, size - idSize - 1);
81 stringstream bufferStream(ios_base::in | ios_base::out | ios_base::binary);
82 bufferStream.exceptions(ios_base::failbit | ios_base::badbit);
83 bufferStream.rdbuf()->pubsetbuf(reinterpret_cast<char *>(decoded.first.get()), decoded.second);
84 FlacMetaDataBlockPicture pictureBlock(value());
85 pictureBlock.parse(bufferStream, decoded.second);
86 setTypeInfo(pictureBlock.pictureType());
87 } catch (const TruncatedDataException &) {
88 diag.emplace_back(DiagLevel::Critical, "METADATA_BLOCK_PICTURE is truncated.", context);
89 throw;
90 } catch (const ConversionException &) {
91 diag.emplace_back(DiagLevel::Critical, "Base64 coding of METADATA_BLOCK_PICTURE is invalid.", context);
92 throw InvalidDataException();
93 } catch (const std::ios_base::failure &failure) {
94 diag.emplace_back(DiagLevel::Critical,
95 argsToString("An IO error occurred when reading the METADATA_BLOCK_PICTURE struct: ", failure.what()), context);
96 throw Failure();
97 }
98 } else if (id().size() + 1 < size) {
99 // extract other values (as string)
100 setValue(TagValue(string(data.get() + idSize + 1, size - idSize - 1), TagTextEncoding::Utf8));
101 }
102 } else {
103 diag.emplace_back(DiagLevel::Critical, argsToString("Field at ", static_cast<std::streamoff>(stream.tellg()), " is truncated."), context);
104 throw TruncatedDataException();
105 }
106 }
107}
108
120{
121 std::uint64_t maxSize = iterator.streamSize() - iterator.currentCharacterOffset();
122 internalParse(iterator, maxSize, diag);
123}
124
135void VorbisCommentField::parse(OggIterator &iterator, std::uint64_t &maxSize, Diagnostics &diag)
136{
137 internalParse(iterator, maxSize, diag);
138}
139
150void VorbisCommentField::parse(istream &stream, std::uint64_t &maxSize, Diagnostics &diag)
151{
152 internalParse(stream, maxSize, diag);
153}
154
164bool VorbisCommentField::make(BinaryWriter &writer, VorbisCommentFlags flags, Diagnostics &diag)
165{
166 static const string context("making Vorbis comment field");
167 if (id().empty()) {
168 diag.emplace_back(DiagLevel::Critical, "The field ID is empty.", context);
169 }
170 try {
171 // try to convert value to string
172 string valueString;
173 if (id() == VorbisCommentIds::cover()) {
174 if (flags & VorbisCommentFlags::NoCovers) {
175 return false;
176 }
177 // make cover
178 if (value().type() != TagDataType::Picture) {
179 diag.emplace_back(DiagLevel::Critical, "Assigned value of cover field is not picture data.", context);
180 throw InvalidDataException();
181 }
182 try {
183 FlacMetaDataBlockPicture pictureBlock(value());
184 pictureBlock.setPictureType(typeInfo());
185
186 const auto requiredSize = pictureBlock.requiredSize();
187 auto buffer = make_unique<char[]>(requiredSize);
188 stringstream bufferStream(ios_base::in | ios_base::out | ios_base::binary);
189 bufferStream.exceptions(ios_base::failbit | ios_base::badbit);
190 bufferStream.rdbuf()->pubsetbuf(buffer.get(), requiredSize);
191
192 pictureBlock.make(bufferStream);
193 valueString = encodeBase64(reinterpret_cast<std::uint8_t *>(buffer.get()), requiredSize);
194 } catch (const Failure &) {
195 diag.emplace_back(DiagLevel::Critical, "Unable to make METADATA_BLOCK_PICTURE struct from the assigned value.", context);
196 throw;
197 } catch (const std::ios_base::failure &failure) {
198 diag.emplace_back(DiagLevel::Critical,
199 argsToString("An IO error occurred when writing the METADATA_BLOCK_PICTURE struct: ", failure.what()), context);
200 throw Failure();
201 }
202 } else {
203 // make normal string value
204 valueString = value().toString();
205 }
206 const auto size(valueString.size() + id().size() + 1);
207 if (size > numeric_limits<std::uint32_t>::max()) {
208 diag.emplace_back(DiagLevel::Critical, "Assigned value exceeds the maximum size.", context);
209 throw InvalidDataException();
210 }
211 writer.writeUInt32LE(static_cast<std::uint32_t>(size));
212 writer.writeString(id());
213 writer.writeChar('=');
214 writer.writeString(valueString);
215 } catch (const ConversionException &) {
216 diag.emplace_back(DiagLevel::Critical, "Assigned value can not be converted appropriately.", context);
217 throw InvalidDataException();
218 }
219 return true;
220}
221
222} // namespace TagParser
The Diagnostics class is a container for DiagMessage.
Definition: diagnostics.h:156
The class inherits from std::exception and serves as base class for exceptions thrown by the elements...
Definition: exceptions.h:11
The FlacMetaDataBlockPicture class is a FLAC "METADATA_BLOCK_PICTURE" parser and maker.
Definition: flacmetadata.h:248
std::uint32_t requiredSize() const
Returns the number of bytes make() will write.
void make(std::ostream &outputStream)
Makes the FLAC "METADATA_BLOCK_PICTURE".
void setPictureType(std::uint32_t pictureType)
Sets the picture type according to the ID3v2 APIC frame.
Definition: flacmetadata.h:289
The exception that is thrown when the data to be parsed or to be made seems invalid and therefore can...
Definition: exceptions.h:25
The OggIterator class helps iterating through all segments of an OGG bitstream.
Definition: oggiterator.h:11
std::uint64_t currentCharacterOffset() const
Returns the offset of the current character in the input stream if the iterator is valid; otherwise a...
Definition: oggiterator.h:222
std::uint64_t streamSize() const
Returns the stream size (which has been specified when constructing the iterator).
Definition: oggiterator.h:117
The TagField class is used by FieldMapBasedTag to store the fields.
void setTypeInfo(const TypeInfoType &typeInfo)
Sets the type info of the current TagField.
const TypeInfoType & typeInfo() const
Returns the type info of the current TagField.
void setValue(const TagValue &value)
Sets the value of the current TagField.
void setId(const IdentifierType &id)
Sets the id of the current Tag Field.
TagValue & value()
Returns the value of the current TagField.
The TagValue class wraps values of different types.
Definition: tagvalue.h:95
std::string toString(TagTextEncoding encoding=TagTextEncoding::Unspecified) const
Converts the value of the current TagValue object to its equivalent std::string representation.
Definition: tagvalue.h:485
The exception that is thrown when the data to be parsed is truncated and therefore can not be parsed ...
Definition: exceptions.h:39
The VorbisCommentField class is used by VorbisComment to store the fields.
void parse(OggIterator &iterator, Diagnostics &diag)
Parses a field using the specified iterator.
VorbisCommentField()
Constructs a new Vorbis comment field.
bool make(CppUtilities::BinaryWriter &writer, VorbisCommentFlags flags, Diagnostics &diag)
Writes the field to a stream using the specified writer.
constexpr TAG_PARSER_EXPORT std::string_view cover()
Contains all classes and functions of the TagInfo library.
Definition: aaccodebook.h:10
VorbisCommentFlags
The VorbisCommentFlags enum specifies flags which controls parsing and making of Vorbis comments.