void Decompress(char* source, char* dest) {
BinaryReader reader(source);
ReadHeader(reader);
BinaryWriter writer(dest);
SlidingWindow window(nullptr, bufferSize_, MaxOffset(), MaxLength() - 1);
window.Initialize();
while(reader.IsEOF() == false) {
int length = reader.ReadBits(lengthBits_);
int value;
if(length == MaxLength()) {
break;
}
if(length == 0) {
value = reader.ReadByte();
}
else {
int offset = reader.ReadBits(offsetBits_);
value = reader.ReadByte();
for(int i = 0; i < length; i++) {
int temp = window.CurrentByte(-offset - 1);
writer.WriteByte(temp);
window.WriteByte(temp);
window.AdvanceWindow(1);
}
}
writer.WriteByte(value);
window.WriteByte(value);
window.AdvanceWindow(1);
}
}
bool Document::Update()
{
bool rc = true;
bool scrolling = false;
if(Touch(0).Pressed())
{
mTouchPosition = Vec2(Touch(0).mPosition);
mCurrentLink = GetLinkRectangle(Touch(0).mPosition);
mGrabbed = true;
rc = false;
}
else if(mGrabbed)
{
if(Touch(0).Held())
{
Vec2 vel (Touch(0).mPosition - Touch(0).mPreviousPosition);
if(vel.x != 0 || vel.y != 0)
{
mScrollVelocity = vel;
scrolling = true;
}
if(mCurrentLink != GetLinkRectangle(Touch(0).mPosition))
{
mCurrentLink = null;
}
}
else if(Touch(0).Released())
{
mGrabbed = false;
scrolling = true;
if(mCurrentLink != null)
{
if(mLinkClickCallback != null)
{
mLinkClickCallback(mCurrentLink);
}
}
mCurrentLink = null;
}
else
{
scrolling = true;
}
}
if(scrolling)
{
mScrollPosition -= mScrollVelocity;
mScrollPosition = Min(Max(Vec2::zero, mScrollPosition), MaxOffset());
}
mScrollVelocity *= 0.95f;
return rc;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void Compress(char* source, char* dest, unsigned offsetBits, unsigned lengthBits) {
assert(source != nullptr);
assert(dest != nullptr);
offsetBits_ = offsetBits;
lengthBits_ = lengthBits;
BinaryReader reader(source);
SlidingWindow window(&reader, bufferSize_, MaxOffset(), MaxLength() - 1);
window.Initialize();
BinaryWriter writer(dest);
WriteHeader(writer);
while(window.IsEOF() == false) {
unsigned length;
unsigned offset;
if(window.FindLongestMatch(offset, length)) {
unsigned char current;
window.AdvanceWindow(length + 1);
if(window.IsOutside()) {
current = window.CurrentByte(-2);
length--;
}
else current = window.CurrentByte(-1);
if(length > 0) {
writer.WriteBits(length, lengthBits_);
writer.WriteBits(offset, offsetBits_);
writer.WriteByte(current);
if(logTokens_) {
char buffer[1024];
std::sprintf(buffer, "o: %d, l: %d, c: %d ", offset, length, current);
tokenLog_ += buffer;
}
}
else {
writer.WriteBits(0, lengthBits_);
writer.WriteByte(current);
if(logTokens_) {
char buffer[1024];
std::sprintf(buffer, "o: %d, l: %d, c: %d ", 0, 0, current);
tokenLog_ += buffer;
}
}
}
else {
writer.WriteBits(0, lengthBits_);
writer.WriteByte(window.CurrentByte());
if(logTokens_) {
char buffer[1024];
std::sprintf(buffer, "o: %d, l: %d, c: %d ", 0, 0, window.CurrentByte());
tokenLog_ += buffer;
}
window.AdvanceWindow(1);
}
}
writer.WriteBits(MaxLength(), lengthBits_);
}
