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#include "BStream.h"
#include "Buffer.h"
static const int s_blockSize = 16 * 1024;
Balau::BStream::BStream(const IO<Handle> & h) : m_h(h), m_buffer((uint8_t *) malloc(s_blockSize)), m_availBytes(0), m_cursor(0), m_passThru(false) {
Assert(m_h->canRead());
m_name.set("Stream(%s)", m_h->getName());
if ((m_h.isA<Buffer>()) || (m_h.isA<BStream>()))
m_passThru = true;
}
void Balau::BStream::close() throw (Balau::GeneralException) {
if (!m_detached)
m_h->close();
free(m_buffer);
m_availBytes = 0;
m_cursor = 0;
}
bool Balau::BStream::isClosed() { return m_closed || m_h->isClosed(); }
bool Balau::BStream::isEOF() { return (m_availBytes == 0) && m_h->isEOF(); }
bool Balau::BStream::canRead() { return true; }
const char * Balau::BStream::getName() { return m_name.to_charp(); }
off_t Balau::BStream::getSize() { return m_h->getSize(); }
ssize_t Balau::BStream::read(void * _buf, size_t count) throw (Balau::GeneralException) {
if (m_passThru)
return m_h->read(_buf, count);
uint8_t * buf = (uint8_t *) _buf;
size_t copied = 0;
size_t toCopy = count;
if (m_availBytes != 0) {
if (toCopy > m_availBytes)
toCopy = m_availBytes;
memcpy(buf, m_buffer + m_cursor, toCopy);
count -= toCopy;
m_cursor += toCopy;
m_availBytes -= toCopy;
copied = toCopy;
buf += toCopy;
toCopy = count;
}
if (count == 0)
return copied;
if (count >= s_blockSize)
return m_h->read(buf, count) + copied;
m_cursor = 0;
Assert(m_availBytes == 0);
ssize_t r = m_h->read(m_buffer, s_blockSize);
Assert(r >= 0);
m_availBytes = r;
if (toCopy > m_availBytes)
toCopy = m_availBytes;
if (toCopy == 0)
return 0;
memcpy(buf, m_buffer, toCopy);
m_cursor += toCopy;
m_availBytes -= toCopy;
copied += toCopy;
return copied;
}
int Balau::BStream::peekNextByte() {
m_passThru = false;
if (m_availBytes == 0) {
uint8_t b;
ssize_t r = read(&b, 1);
if (!r)
return -1;
Assert(r == 1);
Assert(m_cursor > 0);
Assert(m_availBytes < s_blockSize);
m_cursor--;
m_availBytes++;
}
return m_buffer[m_cursor];
}
Balau::String Balau::BStream::readString(bool putNL) {
peekNextByte();
uint8_t * cr, * lf, * nl;
String ret;
size_t chunkSize = 0;
cr = (uint8_t *) memchr(m_buffer + m_cursor, '\r', m_availBytes);
lf = (uint8_t *) memchr(m_buffer + m_cursor, '\n', m_availBytes);
if (cr && lf) {
nl = cr;
if (lf < cr)
nl = lf;
} else if (!cr) {
nl = lf;
} else {
nl = cr;
}
while (!nl) {
chunkSize = m_availBytes;
ret += String((const char *) m_buffer + m_cursor, chunkSize);
m_availBytes -= chunkSize;
m_cursor += chunkSize;
if (isClosed() || isEOF())
return ret;
peekNextByte();
Assert(m_cursor == 0);
cr = (uint8_t *) memchr(m_buffer, '\r', m_availBytes);
lf = (uint8_t *) memchr(m_buffer, '\n', m_availBytes);
if (cr && lf) {
nl = cr;
if (lf < cr)
nl = lf;
} else if (!cr) {
nl = lf;
} else {
nl = cr;
}
}
chunkSize = nl - (m_buffer + m_cursor);
ret += String((const char *) m_buffer + m_cursor, chunkSize);
m_availBytes -= chunkSize;
m_cursor += chunkSize;
char b;
read(&b, 1);
if (putNL)
ret += String(&b, 1);
if ((b == '\r') && (peekNextByte() == '\n')) {
read(&b, 1);
if (putNL)
ret += String(&b, 1);
}
return ret;
}
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