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#include "ZHandle.h"
#include "Task.h"
#include "Async.h"
#include "TaskMan.h"
Balau::ZStream::ZStream(const IO<Handle> & h, int level, header_t header) : m_h(h) {
m_zin.zalloc = m_zout.zalloc = NULL;
m_zin.zfree = m_zout.zfree = NULL;
m_zin.opaque = m_zout.opaque = NULL;
m_zin.next_in = NULL;
m_zin.avail_in = 0;
int window = 0;
switch (header) {
case ZLIB: window = 15; break;
case GZIP: window = 31; break;
case RAW: window = -15; break;
}
int r;
r = inflateInit2(&m_zin, window);
EAssert(r == Z_OK, "inflateInit2 returned %i", r);
r = deflateInit2(&m_zout, level, Z_DEFLATED, window, 9, Z_DEFAULT_STRATEGY);
EAssert(r == Z_OK, "deflateInit2 returned %i", r);
m_name.set("ZStream(%s)", m_h->getName());
}
void Balau::ZStream::close() throw (GeneralException) {
if (m_h->canWrite())
finish();
inflateEnd(&m_zin);
deflateEnd(&m_zout);
if (m_in) {
free(m_in);
m_in = NULL;
}
if (!m_detached)
m_h->close();
m_closed = true;
}
bool Balau::ZStream::isClosed() {
return m_closed;
}
bool Balau::ZStream::isEOF() {
if (m_closed || m_eof)
return true;
return m_h->isEOF();
}
bool Balau::ZStream::canRead() {
return m_h->canRead();
}
bool Balau::ZStream::canWrite() {
return m_h->canWrite();
}
const char * Balau::ZStream::getName() {
return m_name.to_charp();
}
namespace {
class AsyncOpInflate : public Balau::AsyncOperation {
public:
AsyncOpInflate(z_stream * zin, int * r, Balau::Events::Custom * evt) : m_zin(zin), m_r(r), m_evt(evt) { }
virtual bool needsMainQueue() { return false; }
virtual bool needsFinishWorker() { return true; }
virtual void run() {
*m_r = inflate(m_zin, Z_SYNC_FLUSH);
}
virtual void done() {
m_evt->doSignal();
delete this;
}
private:
z_stream * m_zin;
int * m_r;
Balau::Events::Custom * m_evt;
};
};
static const int BLOCK_SIZE = 1024;
ssize_t Balau::ZStream::read(void * buf, size_t count) throw (GeneralException) {
if (m_closed || m_eof)
return 0;
AAssert(m_h->canRead(), "Can't call ZStream::read on a non-readable handle.");
size_t readTotal = 0;
const int block_size = BLOCK_SIZE * (m_useAsyncOp ? 16 : 1);
m_zin.next_out = (Bytef *) buf;
m_zin.avail_out = count;
if (!m_in) {
m_zin.next_in = m_in = (uint8_t *) malloc(block_size);
m_zin.avail_in = 0;
}
while ((count != 0) && !m_h->isClosed() && !m_h->isEOF()) {
if (m_zin.avail_in == 0) {
m_zin.next_in = m_in;
size_t r = m_h->read(m_in, block_size);
if (r <= 0)
return readTotal;
m_zin.avail_in = r;
}
int r = 0;
if (m_useAsyncOp) {
Events::Custom evt;
createAsyncOp(new AsyncOpInflate(&m_zin, &r, &evt));
Task::operationYield(&evt);
} else {
r = inflate(&m_zin, Z_SYNC_FLUSH);
Task::operationYield();
}
size_t didRead = count - m_zin.avail_out;
readTotal += didRead;
count -= didRead;
if (r == Z_STREAM_END) {
m_eof = true;
break;
}
EAssert(r == Z_OK, "inflate() didn't return Z_OK but %i", r);
}
return readTotal;
}
namespace {
class AsyncOpDeflate : public Balau::AsyncOperation {
public:
AsyncOpDeflate(z_stream * zout, int * r, int flush, Balau::Events::Custom * evt) : m_zout(zout), m_r(r), m_flush(flush), m_evt(evt) { }
virtual bool needsMainQueue() { return false; }
virtual bool needsFinishWorker() { return true; }
virtual void run() {
*m_r = deflate(m_zout, m_flush);
}
virtual void done() {
m_evt->doSignal();
delete this;
}
private:
z_stream * m_zout;
int * m_r, m_flush;
Balau::Events::Custom * m_evt;
};
};
ssize_t Balau::ZStream::write(const void * buf, size_t count) throw (GeneralException) {
if (m_closed || m_eof)
return 0;
AAssert(m_h->canWrite(), "Can't call ZStream::write on a non-writable handle.");
size_t wroteTotal = 0;
const int block_size = BLOCK_SIZE * (m_useAsyncOp ? 16 : 1);
m_zout.next_in = (Bytef *) const_cast<void *>(buf);
m_zout.avail_in = count;
void * obuf = m_useAsyncOp ? malloc(block_size) : alloca(block_size);
while ((count != 0) && !m_h->isClosed()) {
m_zout.next_out = (Bytef *) obuf;
m_zout.avail_out = block_size;
int r = 0;
if (m_useAsyncOp) {
Events::Custom evt;
createAsyncOp(new AsyncOpDeflate(&m_zout, &r, Z_NO_FLUSH, &evt));
Task::operationYield(&evt);
} else {
r = deflate(&m_zout, Z_NO_FLUSH);
Task::operationYield();
}
EAssert(r == Z_OK, "deflate() didn't return Z_OK but %i", r);
size_t compressed = block_size - m_zout.avail_out;
if (compressed) {
size_t w = m_h->forceWrite(obuf, compressed);
if (m_useAsyncOp)
free(obuf);
if (w <= 0)
return wroteTotal;
}
size_t didRead = count - m_zout.avail_in;
wroteTotal += didRead;
count -= didRead;
}
return wroteTotal;
}
void Balau::ZStream::doFlush(bool finish) {
AAssert(m_h->canWrite(), "Can't call ZStream::doFlush on a non-writable handle.");
const int block_size = BLOCK_SIZE * (m_useAsyncOp ? 16 : 1);
void * buf = m_useAsyncOp ? malloc(block_size) : alloca(block_size);
m_zout.next_in = NULL;
m_zout.avail_in = 0;
int r;
do {
m_zout.next_out = (Bytef *) buf;
m_zout.avail_out = block_size;
if (m_useAsyncOp) {
Events::Custom evt;
createAsyncOp(new AsyncOpDeflate(&m_zout, &r, finish ? Z_FINISH : Z_SYNC_FLUSH, &evt));
Task::operationYield(&evt);
} else {
r = deflate(&m_zout, finish ? Z_FINISH : Z_SYNC_FLUSH);
Task::operationYield();
}
EAssert((r == Z_OK) || ((r == Z_STREAM_END) && finish), "deflate() didn't return Z_OK or Z_STREAM_END, but %i (finish = %s)", r, finish ? "true" : "false");
size_t compressed = block_size - m_zout.avail_out;
if (compressed) {
size_t w = m_h->forceWrite(buf, compressed);
if (m_useAsyncOp)
free(buf);
if (w <= 0)
return;
}
} while (r == Z_OK && finish);
}
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