向字节字段添加源

Question

下面你可以看到我的最小示例。看一下带有 \includegraphics 的第二个图。我可以添加一个引用字段，如下所示，并在图内添加一个表格。这个方法效果很好。我现在想做的是将相同的引用字段添加到字节字段，但它不起作用。我也尝试使用 \makebox，但这也导致没有解决方案。有人有什么想法吗？

\documentclass{article}
\usepackage{bytefield}
\usepackage{graphicx}
\newsavebox{\bytefieldbox}

\begin{document}
\pagestyle{empty}

\begin{figure}[]
\centering
\begin{bytefield}[bitwidth=1em]{32}
        \bitheader{0-31} \\
        \bitbox{4}{Version} & \bitbox{4}{IHL} & \bitbox{8}{Type of Service} & \bitbox{16}{Total Length} \\
        \bitbox{16}{Identification} & \bitbox{3}{Flags} & \bitbox{13}{Fragment Offset} \\
        \bitbox{8}{\emph{Time to Live}} & \bitbox{8}{Protocol} & \bitbox{16}{Header Checksum} \\
        \bitbox{32}{\emph{Source Address}} \\
        \bitbox{32}{\emph{Destination Address}}\\
        \bitbox{24}{Options} & \bitbox{8}{Padding (if any)} \\
    \end{bytefield}
\caption{some caption}
\end{figure}   

\begin{figure}
\centering
\begin{tabular}{@{}r@{}}
\includegraphics[scale=0.5]{example-image-a}\\

{\footnotesize Source: based on ...}
\end{tabular}
\caption{some caption}
\end{figure}

\end{document}

谢谢

罗伯特

Answer 1

显然，bytefield不喜欢在tabular或在\sbox。我建议一个低级技巧：

\documentclass{article}
\usepackage{bytefield}
\usepackage{graphicx}

\newsavebox{\bytefieldbox}
\newenvironment{sourcedbytefield}[3][]
 {\def\source{#3}\setbox\bytefieldbox=\hbox\bgroup\begin{bytefield}[#1]{#2}}
 {\end{bytefield}\egroup
  \begin{tabular}{@{}r@{}}
  \usebox{\bytefieldbox}\\
  \footnotesize\source
  \end{tabular}}
\newcommand{\sourcedincludegraphics}[3][]{%
  \begin{tabular}{@{}r@{}}
  \includegraphics[#1]{#2}\\
  \footnotesize#3
  \end{tabular}%
}

\begin{document}
\pagestyle{empty}

\begin{figure}[htp]
\centering

\begin{sourcedbytefield}[bitwidth=1em]{32}{Source: based on ...}
  \bitheader{0-31} \\
  \bitbox{4}{Version} & \bitbox{4}{IHL} & \bitbox{8}{Type of Service} & \bitbox{16}{Total Length} \\
  \bitbox{16}{Identification} & \bitbox{3}{Flags} & \bitbox{13}{Fragment Offset} \\
  \bitbox{8}{\emph{Time to Live}} & \bitbox{8}{Protocol} & \bitbox{16}{Header Checksum} \\
  \bitbox{32}{\emph{Source Address}} \\
  \bitbox{32}{\emph{Destination Address}}\\
  \bitbox{24}{Options} & \bitbox{8}{Padding (if any)}
\end{sourcedbytefield}
\caption{some caption}
\end{figure}   

\begin{figure}[htp]
\centering
\sourcedincludegraphics[scale=0.5]{example-image-a}{Source: based on ...}
\caption{some caption}
\end{figure}

\end{document}

\\请注意，环境中不应该有尾随bytefield（\\从最后一行删除）。

Answer 2

如果你把它包装bytefield成一个组{...}，它就可以正常工作

\documentclass{article}
\usepackage{bytefield}
\usepackage{graphicx}
\newsavebox{\bytefieldbox}

\begin{document}
\pagestyle{empty}

\begin{figure}[]
\centering
\begin{tabular}{@{}r@{}}
{\lineskip=1pt
\begin{bytefield}[bitwidth=1em]{32}
        \bitheader{0-31} \\
        \bitbox{4}{Version} & \bitbox{4}{IHL} & \bitbox{8}{Type of Service} & \bitbox{16}{Total Length} \\
        \bitbox{16}{Identification} & \bitbox{3}{Flags} & \bitbox{13}{Fragment Offset} \\
        \bitbox{8}{\emph{Time to Live}} & \bitbox{8}{Protocol} & \bitbox{16}{Header Checksum} \\
        \bitbox{32}{\emph{Source Address}} \\
        \bitbox{32}{\emph{Destination Address}}\\
        \bitbox{24}{Options} & \bitbox{8}{Padding (if any)} 
    \end{bytefield}
   }\\
    {\footnotesize Source: based on ...}
\end{tabular}
\caption{some caption}
\end{figure}   

\begin{figure}
\centering
\begin{tabular}{@{}r@{}}
\includegraphics[scale=0.5]{example-image-a}\\

{\footnotesize Source: based on ...}
\end{tabular}
\caption{some caption}
\end{figure}

\end{document}