bool io_uncompress_gzip(tstream& istream, size_t num_bytes, io::data_t& data)
{
// zlib decompression buffers
static const std::streamsize chunk_size = 64 * 1024;
z_stream strm;
unsigned char in[chunk_size];
unsigned char out[chunk_size];
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
if (inflateInit(&strm) != Z_OK)
{
return false;
}
// decompress the data chunk
while (num_bytes > 0 && istream)
{
const std::streamsize to_read = (num_bytes >= chunk_size) ? chunk_size : num_bytes;
num_bytes -= to_read;
if (!istream.read(reinterpret_cast<char*>(in), to_read))
{
inflateEnd(&strm);
return false;
}
strm.avail_in = static_cast<uInt>(istream.gcount());
strm.next_in = in;
do
{
strm.avail_out = static_cast<uInt>(chunk_size);
strm.next_out = out;
const int ret = inflate(&strm, Z_NO_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END)
{
inflateEnd(&strm);
return false;
}
const std::streamsize have = chunk_size - strm.avail_out;
data.insert(data.end(), out, out + have);
}
while (strm.avail_out == 0);
}
inflateEnd(&strm);
// OK
return (num_bytes == std::string::npos) ? true : (num_bytes == 0);
}
static void loadxm(tstream &s, const char *name, int pt) {
int len;
void *xmdata;
s.openfile(name);
len = s.getint();
xmdata = getmem(len);
s.read(xmdata,len);
rxmplay(xmdata,len,pt);
}
