OpenTTD Source
20241108-master-g80f628063a
|
Owning byte buffer readable as a stream. More...
Public Member Functions | |
ByteBuffer (FileHandle &file, size_t len) | |
Construct buffer from data in a file. More... | |
bool | IsValid () const |
Return whether the buffer was constructed successfully. More... | |
bool | IsEnd () const |
Return whether reading has reached the end of the buffer. More... | |
bool | ReadByte (uint8_t &b) |
Read a single byte from the buffer. More... | |
bool | ReadVariableLength (uint32_t &res) |
Read a MIDI file variable length value. More... | |
bool | ReadBuffer (uint8_t *dest, size_t length) |
Read bytes into a buffer. More... | |
bool | ReadDataBlock (MidiFile::DataBlock *dest, size_t length) |
Read bytes into a MidiFile::DataBlock. More... | |
bool | Skip (size_t count) |
Skip over a number of bytes in the buffer. More... | |
bool | Rewind (size_t count) |
Go a number of bytes back to re-read. More... | |
Private Attributes | |
std::vector< uint8_t > | buf |
size_t | pos |
Owning byte buffer readable as a stream.
RAII-compliant to make teardown in error situations easier.
Definition at line 62 of file midifile.cpp.
|
inline |
Construct buffer from data in a file.
If file does not have sufficient bytes available, the object is constructed in an error state, that causes all further function calls to fail.
file | file to read from at current position |
len | number of bytes to read |
Definition at line 73 of file midifile.cpp.
|
inline |
Return whether reading has reached the end of the buffer.
Definition at line 97 of file midifile.cpp.
Referenced by ReadBuffer(), ReadByte(), ReadDataBlock(), ReadVariableLength(), and Skip().
|
inline |
Return whether the buffer was constructed successfully.
Definition at line 88 of file midifile.cpp.
|
inline |
Read bytes into a buffer.
[out] | dest | buffer to copy into |
length | number of bytes to read |
Definition at line 139 of file midifile.cpp.
References IsEnd().
|
inline |
Read a single byte from the buffer.
[out] | b | returns the read value |
Definition at line 107 of file midifile.cpp.
References IsEnd().
|
inline |
Read bytes into a MidiFile::DataBlock.
[out] | dest | DataBlock to copy into |
length | number of bytes to read |
Definition at line 154 of file midifile.cpp.
References MidiFile::DataBlock::data, and IsEnd().
|
inline |
Read a MIDI file variable length value.
Each byte encodes 7 bits of the value, most-significant bits are encoded first. If the most significant bit in a byte is set, there are further bytes encoding the value.
[out] | res | returns the read value |
Definition at line 121 of file midifile.cpp.
References IsEnd().
|
inline |
Go a number of bytes back to re-read.
count | number of bytes to go back |
Definition at line 181 of file midifile.cpp.
|
inline |
Skip over a number of bytes in the buffer.
count | number of bytes to skip over |
Definition at line 168 of file midifile.cpp.
References IsEnd().