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#include <windows.h>

#include "net/base/upload_data.h"

namespace net {

uint64 UploadData::GetContentLength() const {
  uint64 len = 0;
  std::vector<Element>::const_iterator it = elements_.begin();
  for (; it != elements_.end(); ++it)
    len += (*it).GetContentLength();
  return len;
}

uint64 UploadData::Element::GetContentLength() const {
  if (type_ == TYPE_BYTES)
    return static_cast<uint64>(bytes_.size());

  DCHECK(type_ == TYPE_FILE);

  // NOTE: wininet is unable to upload files larger than 4GB, but we'll let the
  // http layer worry about that.
  // TODO(darin): This size calculation could be out of sync with the state of
  // the file when we get around to reading it.  We should probably find a way
  // to lock the file or somehow protect against this error condition.

  WIN32_FILE_ATTRIBUTE_DATA info;
  if (!GetFileAttributesEx(file_path_.c_str(), GetFileExInfoStandard, &info)) {
    DLOG(WARNING) << "GetFileAttributesEx failed: " << GetLastError();
    return 0;
  }

  uint64 length = static_cast<uint64>(info.nFileSizeHigh) << 32 |
                  info.nFileSizeLow;
  if (file_range_offset_ >= length)
    return 0;  // range is beyond eof

  // compensate for the offset and clip file_range_length_ to eof
  return std::min(length - file_range_offset_, file_range_length_);
}

}  // namespace net