public int readUByte() {
checkAvaliable(1);
int result = _currentBlock.readUByte();
_current_offset++;
if (_currentBlock.available() < 1) {
_currentBlock = getDataInputBlock(_current_offset);
}
return result;
}
public int read() throws IOException {
dieIfClosed();
if (atEOD()) {
return EOF;
}
int result = _currentBlock.readUByte();
_current_offset++;
if (_currentBlock.available() < 1) {
_currentBlock = getDataInputBlock(_current_offset);
}
return result;
}
public int readUShort() {
checkAvaliable(SIZE_SHORT);
int blockAvailable = _currentBlock.available();
int result;
if (blockAvailable > SIZE_SHORT) {
result = _currentBlock.readUShortLE();
} else {
DataInputBlock nextBlock = getDataInputBlock(_current_offset + blockAvailable);
if (blockAvailable == SIZE_SHORT) {
result = _currentBlock.readUShortLE();
} else {
result = nextBlock.readUShortLE(_currentBlock);
}
_currentBlock = nextBlock;
}
_current_offset += SIZE_SHORT;
return result;
}
public long readLong() {
checkAvaliable(SIZE_LONG);
int blockAvailable = _currentBlock.available();
long result;
if (blockAvailable > SIZE_LONG) {
result = _currentBlock.readLongLE();
} else {
DataInputBlock nextBlock = getDataInputBlock(_current_offset + blockAvailable);
if (blockAvailable == SIZE_LONG) {
result = _currentBlock.readLongLE();
} else {
result = nextBlock.readLongLE(_currentBlock, blockAvailable);
}
_currentBlock = nextBlock;
}
_current_offset += SIZE_LONG;
return result;
}
/**
* read data from the internal stores
*
* @param buffer the buffer to write to
* @param offset the offset into our storage to read from This method is currently (Oct 2008) only
* used by test code. Perhaps it can be deleted
*/
void read(byte[] buffer, int offset) {
int len = buffer.length;
DataInputBlock currentBlock = getDataInputBlock(offset);
int blockAvailable = currentBlock.available();
if (blockAvailable > len) {
currentBlock.readFully(buffer, 0, len);
return;
}
// else read big amount in chunks
int remaining = len;
int writePos = 0;
int currentOffset = offset;
while (remaining > 0) {
boolean blockIsExpiring = remaining >= blockAvailable;
int reqSize;
if (blockIsExpiring) {
reqSize = blockAvailable;
} else {
reqSize = remaining;
}
currentBlock.readFully(buffer, writePos, reqSize);
remaining -= reqSize;
writePos += reqSize;
currentOffset += reqSize;
if (blockIsExpiring) {
if (currentOffset == _size) {
if (remaining > 0) {
throw new IllegalStateException("reached end of document stream unexpectedly");
}
currentBlock = null;
break;
}
currentBlock = getDataInputBlock(currentOffset);
blockAvailable = currentBlock.available();
}
}
}
public void readFully(byte[] buf, int off, int len) {
checkAvaliable(len);
int blockAvailable = _currentBlock.available();
if (blockAvailable > len) {
_currentBlock.readFully(buf, off, len);
_current_offset += len;
return;
}
// else read big amount in chunks
int remaining = len;
int writePos = off;
while (remaining > 0) {
boolean blockIsExpiring = remaining >= blockAvailable;
int reqSize;
if (blockIsExpiring) {
reqSize = blockAvailable;
} else {
reqSize = remaining;
}
_currentBlock.readFully(buf, writePos, reqSize);
remaining -= reqSize;
writePos += reqSize;
_current_offset += reqSize;
if (blockIsExpiring) {
if (_current_offset == _document_size) {
if (remaining > 0) {
throw new IllegalStateException("reached end of document stream unexpectedly");
}
_currentBlock = null;
break;
}
_currentBlock = getDataInputBlock(_current_offset);
blockAvailable = _currentBlock.available();
}
}
}
