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#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "Buffer.h"
#include "Task.h"
#include "Printer.h"
static const int s_blockSize = 16 * 1024;
Balau::Buffer::~Buffer() {
if (!m_fromConst)
free(m_buffer);
}
void Balau::Buffer::close() throw (GeneralException) {
reset();
}
ssize_t Balau::Buffer::read(void * buf, size_t count) throw (GeneralException) {
off64_t cursor = rtell();
if (cursor >= m_bufSize)
return 0;
size_t avail = m_bufSize - cursor;
if (count > avail)
count = avail;
memcpy(buf, m_buffer + cursor, count);
rseek(cursor + count);
return count;
}
ssize_t Balau::Buffer::write(const void * buf, size_t count) throw (GeneralException) {
if (m_fromConst)
throw GeneralException("Buffer is read only and can't be written to.");
off64_t cursor = wtell();
off64_t end = cursor + count;
off64_t endBlock = (end / s_blockSize) + ((end % s_blockSize) ? 1 : 0);
off64_t oldEndBlock = m_numBlocks;
if (endBlock > oldEndBlock) {
m_buffer = (uint8_t *) realloc(m_buffer, endBlock * s_blockSize);
memset(m_buffer + oldEndBlock * s_blockSize, 0, (endBlock - oldEndBlock) * s_blockSize);
m_numBlocks = endBlock;
}
memcpy(m_buffer + cursor, buf, count);
wseek(cursor + count);
if (m_bufSize < end)
m_bufSize = end;
return count;
}
void Balau::Buffer::reset() {
if (!m_fromConst) {
m_buffer = (uint8_t *)realloc(m_buffer, 0);
m_bufSize = 0;
}
m_numBlocks = 0;
wseek(0);
rseek(0);
}
void Balau::Buffer::clear() {
reset();
m_fromConst = false;
m_buffer = NULL;
m_bufSize = 0;
}
void Balau::Buffer::borrow(const uint8_t * buffer, size_t s) {
clear();
m_fromConst = true;
m_buffer = const_cast<uint8_t *>(buffer);
m_bufSize = s;
}
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