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AK/LibAudio: Add stream read operators to AK::BufferStream, and use it in AWavLoader

Browse source 
At the same time, we allow chaining of streaming operators, and add a
way to check for partial reads (also used in WAV parsing).
This commit is contained in:
Robin Burchell 2019-07-14 00:28:30 +02:00 • committed by Andreas Kling
parent 3792883219
commit 7b75632e5c
3 changed files with 116 additions and 88 deletions
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79
AK/BufferStream.h
View file

@ -12,40 +12,100 @@ public:
{
}
void operator<<(u8 value)
~BufferStream()
{
ASSERT(!m_read_failure);
}
BufferStream& operator<<(u8 value)
{
m_buffer[m_offset++] = value;
return *this;
}
BufferStream& operator>>(u8& value )
{
if (m_offset + sizeof(value) >= unsigned(m_buffer.size())) {
m_read_failure = true;
return *this;
}
value = m_buffer[m_offset++];
return *this;
}
void operator<<(char value)
BufferStream& operator<<(char value)
{
m_buffer[m_offset++] = (u8)value;
return *this;
}
BufferStream& operator>>(char& value)
{
if (m_offset + sizeof(value) >= unsigned(m_buffer.size())) {
m_read_failure = true;
return *this;
}
value = (u8)m_buffer[m_offset++];
return *this;
}
void operator<<(u16 value)
BufferStream& operator<<(u16 value)
{
m_buffer[m_offset++] = value;
m_buffer[m_offset++] = (u8)(value >> 8);
return *this;
}
BufferStream& operator>>(u16& value)
{
if (m_offset + sizeof(value) >= unsigned(m_buffer.size())) {
m_read_failure = true;
return *this;
}
value = 0;
u8 b0 = m_buffer[m_offset++];
u8 b1 = m_buffer[m_offset++];
value |= (u8(b1) << 8);
value |= (u8(b0));
return *this;
}
void operator<<(u32 value)
BufferStream& operator<<(u32 value)
{
m_buffer[m_offset++] = value;
m_buffer[m_offset++] = (u8)(value >> 8);
m_buffer[m_offset++] = (u8)(value >> 16);
m_buffer[m_offset++] = (u8)(value >> 24);
return *this;
}
BufferStream& operator>>(u32& value)
{
if (m_offset + sizeof(value) >= unsigned(m_buffer.size())) {
m_read_failure = true;
return *this;
}
u8 b0 = m_buffer[m_offset++];
u8 b1 = m_buffer[m_offset++];
u8 b2 = m_buffer[m_offset++];
u8 b3 = m_buffer[m_offset++];
value = 0;
value |= (u8(b3) << 24);
value |= (u8(b2) << 16);
value |= (u8(b1) << 8);
value |= (u8(b0));
return *this;
}
void operator<<(const StringView& value)
BufferStream& operator<<(const StringView& value)
{
for (ssize_t i = 0; i < value.length(); ++i)
m_buffer[m_offset++] = value[i];
return *this;
}
void operator<<(const ByteBuffer& value)
BufferStream& operator<<(const ByteBuffer& value)
{
for (ssize_t i = 0; i < value.size(); ++i)
m_buffer[m_offset++] = value[i];
return *this;
}
bool at_end() const
@ -66,9 +126,16 @@ public:
m_buffer.trim(m_offset);
}
bool handle_read_failure() {
bool old = m_read_failure;
m_read_failure = false;
return old;
}
private:
ByteBuffer& m_buffer;
ssize_t m_offset { 0 };
bool m_read_failure { false };
};
}