String ZCompress(const void *data, int len, Gate2<int, int> progress)
{
StringStream out;
MemReadStream in(data, len);
ZCompress(out, in, progress);
return out;
}
String PackImlData(const Vector<Image>& image)
{
StringBuffer block;
for(int i = 0; i < image.GetCount(); i++) {
const Image& img = image[i];
StringStream ss;
ss.Put(img.GetResolution() << 6);
Size sz = img.GetSize();
ss.Put16le(sz.cx);
ss.Put16le(sz.cy);
Point p = img.GetHotSpot();
ss.Put16le(p.x);
ss.Put16le(p.y);
p = img.Get2ndSpot();
ss.Put16le(p.x);
ss.Put16le(p.y);
block.Cat(ss.GetResult());
const RGBA *s = img;
const RGBA *e = s + img.GetLength();
while(s < e) {
block.Cat(s->r);
block.Cat(s->g);
block.Cat(s->b);
block.Cat(s->a);
s++;
}
}
return ZCompress(block);
}
int GZCompress(Stream& out, Stream& in, int size, Gate2<int, int> progress)
{
static byte gzip_header[10] = { GZ_MAGIC1, GZ_MAGIC2, Z_DEFLATED, 0, 0, 0, 0, 0, 0, OS_CODE };
out.Put(gzip_header, 10);
dword crc;
int sz = ZCompress(out, in, size, progress, true, &crc);
out.Put32le(crc);
out.Put32le(size);
return sz;
}
int StaticCompressor::compressBuffer(const unsigned char *plainBuffer,
const unsigned int plainSize,
unsigned char *&compressedBuffer,
unsigned int &compressedSize)
{
#ifdef DEBUG
*logofs << "StaticCompressor: Called for buffer at "
<< (void *) plainBuffer << ".\n"
<< logofs_flush;
#endif
compressedSize = plainSize;
if (plainSize < (unsigned int) threshold_)
{
#ifdef TEST
*logofs << "StaticCompressor: Leaving buffer unchanged. "
<< "Plain size is " << plainSize << " with threshold "
<< (unsigned int) threshold_ << ".\n" << logofs_flush;
#endif
return 0;
}
//
// Determine the size of the temporary
// buffer.
//
unsigned int newSize = plainSize + (plainSize / 1000) + 12;
//
// Allocate a new buffer if it grows
// beyond 64K.
//
if (buffer_ == NULL || (bufferSize_ > 65536 &&
newSize < bufferSize_ / 2) || newSize > bufferSize_)
{
delete [] buffer_;
buffer_ = new unsigned char[newSize];
if (buffer_ == NULL)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Can't allocate compression "
<< "buffer of " << newSize << " bytes. Error is " << EGET()
<< " ' " << ESTR() << "'.\n" << logofs_flush;
#endif
cerr << "Warning" << ": Can't allocate compression buffer of "
<< newSize << " bytes. Error is " << EGET()
<< " '" << ESTR() << "'.\n";
bufferSize_ = 0;
return 0;
}
bufferSize_ = newSize;
}
unsigned int resultingSize = newSize;
int result = ZCompress(&compressionStream_, buffer_, &resultingSize,
plainBuffer, plainSize);
if (result == Z_OK)
{
if (resultingSize > newSize)
{
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Overflow in compression "
<< "buffer size. " << "Expected size was " << newSize
<< " while it is " << resultingSize << ".\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Overflow in compress buffer size. "
<< "Expected size was " << newSize << " while it is "
<< resultingSize << ".\n";
return -1;
}
else if (resultingSize >= plainSize)
{
#ifdef TEST
*logofs << "StaticCompressor: Leaving buffer unchanged. "
<< "Plain size is " << plainSize << " compressed "
<< "size is " << resultingSize << ".\n"
<< logofs_flush;
#endif
return 0;
}
compressedBuffer = buffer_;
compressedSize = resultingSize;
#ifdef TEST
*logofs << "StaticCompressor: Compressed buffer from "
<< plainSize << " to " << resultingSize
<< " bytes.\n" << logofs_flush;
#endif
return 1;
}
#ifdef PANIC
*logofs << "StaticCompressor: PANIC! Failed compression of buffer. "
<< "Error is '" << zError(result) << "'.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Failed compression of buffer. "
<< "Error is '" << zError(result) << "'.\n";
return -1;
}
String ZCompress(const String& s, Gate2<int, int> progress)
{
return ZCompress(~s, s.GetCount(), progress);
}
int ZCompress(Stream& out, Stream& in, Gate2<int, int> progress)
{
return ZCompress(out, in, (int)in.GetLeft(), progress);
}
