Index: src/platform/update_engine/bzip_extent_writer.cc |
diff --git a/src/platform/update_engine/bzip_extent_writer.cc b/src/platform/update_engine/bzip_extent_writer.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f5f8703c113f44b580d03f838bbaf00649ab2c5e |
--- /dev/null |
+++ b/src/platform/update_engine/bzip_extent_writer.cc |
@@ -0,0 +1,75 @@ |
+// Copyright (c) 2009 The Chromium OS Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "update_engine/bzip_extent_writer.h" |
+ |
+using std::vector; |
+ |
+namespace chromeos_update_engine { |
+ |
+namespace { |
+const vector<char>::size_type kOutputBufferLength = 1024 * 1024; |
+} |
+ |
+bool BzipExtentWriter::Init(int fd, |
+ const vector<Extent>& extents, |
+ uint32 block_size) { |
+ // Init bzip2 stream |
+ int rc = BZ2_bzDecompressInit(&stream_, |
+ 0, // verbosity. (0 == silent) |
+ 0 // 0 = faster algo, more memory |
+ ); |
+ TEST_AND_RETURN_FALSE(rc == BZ_OK); |
+ |
+ return next_->Init(fd, extents, block_size); |
+} |
+ |
+bool BzipExtentWriter::Write(const void* bytes, size_t count) { |
+ vector<char> output_buffer(kOutputBufferLength); |
+ |
+ const char* c_bytes = reinterpret_cast<const char*>(bytes); |
+ |
+ input_buffer_.insert(input_buffer_.end(), c_bytes, c_bytes + count); |
+ |
+ stream_.next_in = &input_buffer_[0]; |
+ stream_.avail_in = input_buffer_.size(); |
+ |
+ for (;;) { |
+ stream_.next_out = &output_buffer[0]; |
+ stream_.avail_out = output_buffer.size(); |
+ |
+ int rc = BZ2_bzDecompress(&stream_); |
+ TEST_AND_RETURN_FALSE(rc == BZ_OK || rc == BZ_STREAM_END); |
+ |
+ if (stream_.avail_out == output_buffer.size()) |
+ break; // got no new bytes |
+ |
+ TEST_AND_RETURN_FALSE( |
+ next_->Write(&output_buffer[0], |
+ output_buffer.size() - stream_.avail_out)); |
+ |
+ if (rc == BZ_STREAM_END) |
+ CHECK_EQ(stream_.avail_in, 0); |
+ if (stream_.avail_in == 0) |
+ break; // no more input to process |
+ } |
+ |
+ // store unconsumed data in input_buffer_. |
+ |
+ vector<char> new_input_buffer; |
+ new_input_buffer.insert(new_input_buffer.end(), |
Daniel Erat
2010/02/03 02:12:24
i think you can just pass the two iterators to the
adlr
2010/02/04 22:25:37
Done.
|
+ input_buffer_.end() - stream_.avail_in, |
+ input_buffer_.end()); |
+ new_input_buffer.swap(input_buffer_); |
+ |
+ return true; |
+} |
+ |
+bool BzipExtentWriter::EndImpl() { |
+ TEST_AND_RETURN_FALSE(input_buffer_.empty()); |
+ TEST_AND_RETURN_FALSE(BZ2_bzDecompressEnd(&stream_) == BZ_OK); |
+ return next_->End(); |
+} |
+ |
+} // namespace chromeos_update_engine |