Zlib moved into separate module.

ZlibDecompressor.cpp

@@ -0,0 +1,70 @@
+/*
+ * =====================================================================
+ *        Version:  1.0
+ *        Created:  18.09.2012 10:20:47
+ *         Author:  Miroslav Bendík
+ *        Company:  LinuxOS.sk
+ * =====================================================================
+ */
+
+#include <zlib.h>
+#include "ZlibDecompressor.h"
+
+ZlibDecompressor::ZlibDecompressor(const unsigned char *data, std::size_t size):
+	m_data(data),
+	m_seekPos(0),
+	m_size(size)
+{
+}
+
+ZlibDecompressor::~ZlibDecompressor()
+{
+}
+
+void ZlibDecompressor::setSeekPos(std::size_t seekPos)
+{
+	m_seekPos = seekPos;
+}
+
+std::size_t ZlibDecompressor::seekPos() const
+{
+	return m_seekPos;
+}
+
+ZlibDecompressor::string ZlibDecompressor::decompress()
+{
+	const unsigned char *data = m_data + m_seekPos;
+	const std::size_t size = m_size - m_seekPos;
+
+	string buffer;
+	const size_t BUFSIZE = 128 * 1024;
+	uint8_t temp_buffer[BUFSIZE];
+
+	z_stream strm;
+	strm.zalloc = Z_NULL;
+	strm.zfree = Z_NULL;
+	strm.opaque = Z_NULL;
+	strm.next_in = Z_NULL;
+	strm.avail_in = size;
+
+	if (inflateInit(&strm) != Z_OK) {
+		throw DecompressError();
+	}
+
+	strm.next_in = const_cast<unsigned char *>(data);
+	int ret = 0;
+	do {
+		strm.avail_out = BUFSIZE;
+		strm.next_out = temp_buffer;
+		ret = inflate(&strm, Z_NO_FLUSH);
+		buffer += string(reinterpret_cast<unsigned char *>(temp_buffer), BUFSIZE - strm.avail_out);
+	} while (ret == Z_OK);
+	if (ret != Z_STREAM_END) {
+		throw DecompressError();
+	}
+	m_seekPos += strm.next_in - data;
+	(void)inflateEnd(&strm);
+
+	return buffer;
+}
+