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Clean up docs for -obj

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John Whitington
2025-01-02 14:39:27 +00:00
parent 935431e52a
commit a3cbc3e365
3 changed files with 36 additions and 16 deletions
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3
cpdfcommand.ml
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@@ -3641,10 +3641,11 @@ let build_enc () =
let print_obj json pdf objspec =
let obj = Cpdftweak.find_obj pdf objspec in
let trim s = implode (rev (tl (rev (tl (explode s))))) in
if json then
print_string (Cpdfyojson.Safe.pretty_to_string (Cpdfjson.json_of_object ~utf8:true pdf (fun _ -> ()) ~no_stream_data:false ~parse_content:false obj))
else
Printf.printf "%S\n" (Pdfwrite.string_of_pdf obj)
print_endline (trim (Printf.sprintf "%S" (Pdfwrite.string_of_pdf obj)))
let extract_stream_find_obj pdf objspec =
int_of_string objspec

BIN
cpdfmanual.pdf
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49
cpdfmanual.tex
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@@ -6559,50 +6559,69 @@ The \texttt{-remove-clipping} operation removes any clipping paths on given page
{\small\begin{verbatim}
$ cpdf -obj 0 in.pdf
"<</Root 1256 0 R/Length 588/ID[('\029\\t>\249\157\182F_\153V\175z[\234\196)
('\029\\t>\249\157\182F_\153V\175z[\234\196)]/Info 1351 0 R/Size 1406>>"
<</Root 1256 0 R/Length 588/ID[('\029\\t>\249\157\182F_\153V\175z[\234\196)
('\029\\t>\249\157\182F_\153V\175z[\234\196)]/Info 1351 0 R/Size 1406>>
$ cpdf -obj 1256 in.pdf
"<</OpenAction 1238 0 R/PageLabels<</Nums[0<</S/r>>16<</S/D>>]>>/PageMode
/UseOutlines/Names 924 0 R/Outlines 838 0 R/Pages 851 0 R/Type/Catalog>>"
<</OpenAction 1238 0 R/PageLabels<</Nums[0<</S/r>>16<</S/D>>]>>/PageMode
/UseOutlines/Names 924 0 R/Outlines 838 0 R/Pages 851 0 R/Type/Catalog>>
$ cpdf -obj 1238 out.pdf
"<</D[1225 0 R/Fit]/S/GoTo>>"
<</D[1225 0 R/Fit]/S/GoTo>>
\end{verbatim}}
\noindent Alternatively, we may follow a chain of dictionary entries from the trailer dictionary:
{\small\begin{verbatim}
$ ./cpdf -obj /Root/Pages/Count cpdfmanual.pdf
"133"
133
\end{verbatim}}
\noindent Or, from a given object number:
{\small\begin{verbatim}
$ ./cpdf -obj 1256/PageLabels/Nums cpdfmanual.pdf
[0<</S/r>>16<</S/D>>]
\end{verbatim}}
\noindent We may also begin at a numbered page instead of at the trailer dictionary:
{\small\begin{verbatim}
./cpdf -obj P20/Resources/Font/F58/BaseFont cpdfmanual.pdf
"/MCBERL+URWPalladioL-Roma"
/MCBERL+URWPalladioL-Roma
\end{verbatim}}
\noindent If the object does not exist, Cpdf will exit with code 2. To output data in JSON format instead of PDF format, use \texttt{-obj-json} in place of \texttt{-obj}.
\noindent To output data in JSON format instead of PDF format, add \texttt{-json}:
A stream may be extracted with \texttt{-extract-stream} or \texttt{-extract-stream-decompress}, which decompresses it first where possible:
{\small\begin{verbatim}
./cpdf -obj-json 140/Prev/Prev/Prev cpdfmanual.pdf
{ "/Title": 129, "/A": 126, "/Parent": 112, "/Prev": 124, "/Next": 132 }
\end{verbatim}}
\noindent We can follow array entries as well as dictionary entries by giving the index number into the array - here object 0 (the trailer dictionary), dictionary entry \texttt{/ID}, index number 0:
{\small\begin{verbatim}
./cpdf -obj 0/ID/[0] hello.pdf
(\232\20625\030\179/\176q:O\202\135\176u\137)
\end{verbatim}}
\noindent A stream may be extracted with \texttt{-extract-stream} or \texttt{-extract-stream-decompress}, which decompresses it first where possible:
{\small\begin{verbatim}
$ cpdf -obj 0 hello.pdf
"<</Size 4/Root 4 0 R/ID[(\232\20625\030\179/\176q:O\202\135\176u\137)
(\232\20625\030\179/\176q:O\202\135\176u\137)]>>"
<</Size 4/Root 4 0 R/ID[(\232\20625\030\179/\176q:O\202\135\176u\137)
(\232\20625\030\179/\176q:O\202\135\176u\137)]>>
$ cpdf -obj 4 hello.pdf
"<</Type/Catalog/Pages 1 0 R>>"
<</Type/Catalog/Pages 1 0 R>>
$ cpdf -obj 1 hello.pdf
"<</Type/Pages/Kids[3 0 R]/Count 1>>"
<</Type/Pages/Kids[3 0 R]/Count 1>>
$ cpdf -obj 3 hello.pdf
"<</Type/Page/Parent 1 0 R/Resources<</Font<</F0<</Type/Font/Subtype/Type1
<</Type/Page/Parent 1 0 R/Resources<</Font<</F0<</Type/Font/Subtype/Type1
/BaseFont/Times-Italic>>>>>>/MediaBox[0 0 595.275590551 841.88976378]
/Rotate 0/Contents[2 0 R]>>"
/Rotate 0/Contents[2 0 R]>>
$ cpdf -extract-stream-decompress 2 hello.pdf -stdout
1 0 0 1 50 770 cm BT/F0 36 Tf(Hello, World!)Tj ET