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#include "ZHandle.h"
#include "Task.h"
Balau::ZStream::ZStream(const IO<Handle> & h, int level, header_t header) : m_h(h), m_detached(false), m_closed(false), m_eof(false), m_in(NULL) {
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_in) {
free(m_in);
m_in = NULL;
}
if (m_h->canWrite())
finish();
inflateEnd(&m_zin);
deflateEnd(&m_zout);
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();
}
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;
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;
}
Task::yield(nullptr);
int r = inflate(&m_zin, Z_SYNC_FLUSH);
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;
}
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;
m_zout.next_in = (Bytef *) const_cast<void *>(buf);
m_zout.avail_in = count;
void * obuf = alloca(BLOCK_SIZE);
while ((count != 0) && !m_h->isClosed()) {
m_zout.next_out = (Bytef *) obuf;
m_zout.avail_out = BLOCK_SIZE;
int r = deflate(&m_zout, Z_NO_FLUSH);
EAssert(r == Z_OK, "deflate() didn't return Z_OK but %i", r);
Task::yield(nullptr);
size_t compressed = BLOCK_SIZE - m_zout.avail_out;
if (compressed) {
size_t w = m_h->forceWrite(obuf, compressed);
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) {
void * buf = 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;
r = deflate(&m_zout, finish ? Z_FINISH : Z_SYNC_FLUSH);
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 (w <= 0)
return;
}
} while (r == Z_OK && finish);
}
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