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Delay loading of the Info object and clean up the pdfioinfo example (Issue #87)

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Michael R Sweet 2025-01-17 16:50:30 -05:00
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6 changed files with 78 additions and 29 deletions
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1
CHANGES.md
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@ -6,6 +6,7 @@ v1.4.1 - YYYY-MM-DD
-------------------
- Fixed the link libraries for the example source code (Issue #86)
- Fixed handling of the Info object (Issue #87)
v1.4.0 - 2024-12-26

28
doc/pdfio.3
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@ -1,4 +1,4 @@
.TH pdfio 3 "pdf read/write library" "2024-12-26" "pdf read/write library"
.TH pdfio 3 "pdf read/write library" "2025-01-17" "pdf read/write library"
.SH NAME
pdfio \- pdf read/write library
.SH Introduction
@ -1045,9 +1045,11 @@ The pdfioinfo.c example program opens a PDF file and prints the title, author, c
{
const char *filename; // PDF filename
pdfio_file_t *pdf; // PDF file
const char *author; // Author name
time_t creation_date; // Creation date
struct tm *creation_tm; // Creation date/time information
char creation_text[256]; // Creation date/time as a string
const char *title; // Title
// Get the filename from the command\-line...
@ -1065,15 +1067,25 @@ The pdfioinfo.c example program opens a PDF file and prints the title, author, c
if (pdf == NULL)
return (1);
// Get the title and author...
author = pdfioFileGetAuthor(pdf);
title = pdfioFileGetTitle(pdf);
// Get the creation date and convert to a string...
creation_date = pdfioFileGetCreationDate(pdf);
creation_tm = localtime(&creation_date);
strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
if ((creation_date = pdfioFileGetCreationDate(pdf)) > 0)
{
creation_tm = localtime(&creation_date);
strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
}
else
{
snprintf(creation_text, sizeof(creation_text), "\-\- not set \-\-");
}
// Print file information to stdout...
printf("%s:\\n", filename);
printf(" Title: %s\\n", pdfioFileGetTitle(pdf));
printf(" Author: %s\\n", pdfioFileGetAuthor(pdf));
printf(" Title: %s\\n", title ? title : "\-\- not set \-\-");
printf(" Author: %s\\n", author ? author : "\-\- not set \-\-");
printf(" Created On: %s\\n", creation_text);
printf(" Number Pages: %u\\n", (unsigned)pdfioFileGetNumPages(pdf));
@ -2062,7 +2074,7 @@ The render_line function adds content from the linefrag_t array to a PDF page. I
}
.fi
.PP
We then loops through the fragments for the current line, drawing checkboxes, images, and text as needed. When a hyperlink is present, we add the link to the links array in the docdata_t structure, mapping "@" and "@@" to an internal link corresponding to the linked text:
We then loops through the fragments for the current line, drawing checkboxes, images, and text as needed. Whan a hyperlink is present, we add the link to the links array in the docdata_t structure, mapping "@" and "@@" to an internal link corresponding to the linked text:
.nf
if (frag\->url && dd\->num_links < DOCLINK_MAX)
@ -2070,7 +2082,7 @@ We then loops through the fragments for the current line, drawing checkboxes, im
doclink_t *l = dd\->links + dd\->num_links;
// Pointer to this link record
if (!strcmp(frag\->url, "@"))
if (!strcmp(frag\->url, "@"))
{
// Use mapped text as link target...
char targetlink[129]; // Targeted link

26
doc/pdfio.html
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@ -1161,9 +1161,11 @@ main(<span class="reserved">int</span> argc, <span clas
{
<span class="reserved">const</span> <span class="reserved">char</span> *filename; <span class="comment">// PDF filename</span>
pdfio_file_t *pdf; <span class="comment">// PDF file</span>
<span class="reserved">const</span> <span class="reserved">char</span> *author; <span class="comment">// Author name</span>
time_t creation_date; <span class="comment">// Creation date</span>
<span class="reserved">struct</span> tm *creation_tm; <span class="comment">// Creation date/time information</span>
<span class="reserved">char</span> creation_text[<span class="number">256</span>]; <span class="comment">// Creation date/time as a string</span>
<span class="reserved">const</span> <span class="reserved">char</span> *title; <span class="comment">// Title</span>
<span class="comment">// Get the filename from the command-line...</span>
@ -1181,15 +1183,25 @@ main(<span class="reserved">int</span> argc, <span clas
<span class="reserved">if</span> (pdf == NULL)
<span class="reserved">return</span> (<span class="number">1</span>);
<span class="comment">// Get the title and author...</span>
author = pdfioFileGetAuthor(pdf);
title = pdfioFileGetTitle(pdf);
<span class="comment">// Get the creation date and convert to a string...</span>
creation_date = pdfioFileGetCreationDate(pdf);
creation_tm = localtime(&amp;creation_date);
strftime(creation_text, <span class="reserved">sizeof</span>(creation_text), <span class="string">&quot;%c&quot;</span>, creation_tm);
<span class="reserved">if</span> ((creation_date = pdfioFileGetCreationDate(pdf)) &gt; <span class="number">0</span>)
{
creation_tm = localtime(&amp;creation_date);
strftime(creation_text, <span class="reserved">sizeof</span>(creation_text), <span class="string">&quot;%c&quot;</span>, creation_tm);
}
<span class="reserved">else</span>
{
snprintf(creation_text, <span class="reserved">sizeof</span>(creation_text), <span class="string">&quot;-- not set --&quot;</span>);
}
<span class="comment">// Print file information to stdout...</span>
printf(<span class="string">&quot;%s:\n&quot;</span>, filename);
printf(<span class="string">&quot; Title: %s\n&quot;</span>, pdfioFileGetTitle(pdf));
printf(<span class="string">&quot; Author: %s\n&quot;</span>, pdfioFileGetAuthor(pdf));
printf(<span class="string">&quot; Title: %s\n&quot;</span>, title ? title : <span class="string">&quot;-- not set --&quot;</span>);
printf(<span class="string">&quot; Author: %s\n&quot;</span>, author ? author : <span class="string">&quot;-- not set --&quot;</span>);
printf(<span class="string">&quot; Created On: %s\n&quot;</span>, creation_text);
printf(<span class="string">&quot; Number Pages: %u\n&quot;</span>, (<span class="reserved">unsigned</span>)pdfioFileGetNumPages(pdf));
@ -2022,13 +2034,13 @@ dd-&gt;y -= margin_top + lineheight;
dd-&gt;y -= lineheight;
}
</code></pre>
<p>We then loops through the fragments for the current line, drawing checkboxes, images, and text as needed. When a hyperlink is present, we add the link to the <code>links</code> array in the <code>docdata_t</code> structure, mapping &quot;@&quot; and &quot;@@&quot; to an internal link corresponding to the linked text:</p>
<p>We then loops through the fragments for the current line, drawing checkboxes, images, and text as needed. WhÑn a hyperlink is present, we add the link to the <code>links</code> array in the <code>docdata_t</code> structure, mapping &quot;@&quot; and &quot;@@&quot; to an internal link corresponding to the linked text:</p>
<pre><code class="language-c"><span class="reserved">if</span> (frag-&gt;url &amp;&amp; dd-&gt;num_links &lt; DOCLINK_MAX)
{
doclink_t *l = dd-&gt;links + dd-&gt;num_links;
<span class="comment">// Pointer to this link record</span>
ï<span class="reserved">if</span> (!strcmp(frag-&gt;url, <span class="string">&quot;@&quot;</span>))
<span class="reserved">if</span> (!strcmp(frag-&gt;url, <span class="string">&quot;@&quot;</span>))
{
<span class="comment">// Use mapped text as link target...</span>
<span class="reserved">char</span> targetlink[<span class="number">129</span>]; <span class="comment">// Targeted link</span>

22
doc/pdfio.md
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@ -886,9 +886,11 @@ main(int argc, // I - Number of command-line arguments
{
const char *filename; // PDF filename
pdfio_file_t *pdf; // PDF file
const char *author; // Author name
time_t creation_date; // Creation date
struct tm *creation_tm; // Creation date/time information
char creation_text[256]; // Creation date/time as a string
const char *title; // Title
// Get the filename from the command-line...
@ -906,15 +908,25 @@ main(int argc, // I - Number of command-line arguments
if (pdf == NULL)
return (1);
// Get the title and author...
author = pdfioFileGetAuthor(pdf);
title = pdfioFileGetTitle(pdf);
// Get the creation date and convert to a string...
creation_date = pdfioFileGetCreationDate(pdf);
creation_tm = localtime(&creation_date);
strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
if ((creation_date = pdfioFileGetCreationDate(pdf)) > 0)
{
creation_tm = localtime(&creation_date);
strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
}
else
{
snprintf(creation_text, sizeof(creation_text), "-- not set --");
}
// Print file information to stdout...
printf("%s:\n", filename);
printf(" Title: %s\n", pdfioFileGetTitle(pdf));
printf(" Author: %s\n", pdfioFileGetAuthor(pdf));
printf(" Title: %s\n", title ? title : "-- not set --");
printf(" Author: %s\n", author ? author : "-- not set --");
printf(" Created On: %s\n", creation_text);
printf(" Number Pages: %u\n", (unsigned)pdfioFileGetNumPages(pdf));

24
examples/pdfioinfo.c
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@ -1,7 +1,7 @@
//
// PDF metadata example for PDFio.
//
// Copyright © 2023-2024 by Michael R Sweet.
// Copyright © 2023-2025 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
@ -25,9 +25,11 @@ main(int argc, // I - Number of command-line arguments
{
const char *filename; // PDF filename
pdfio_file_t *pdf; // PDF file
const char *author; // Author name
time_t creation_date; // Creation date
struct tm *creation_tm; // Creation date/time information
char creation_text[256]; // Creation date/time as a string
const char *title; // Title
// Get the filename from the command-line...
@ -46,15 +48,25 @@ main(int argc, // I - Number of command-line arguments
if (pdf == NULL)
return (1);
// Get the title and author...
author = pdfioFileGetAuthor(pdf);
title = pdfioFileGetTitle(pdf);
// Get the creation date and convert to a string...
creation_date = pdfioFileGetCreationDate(pdf);
creation_tm = localtime(&creation_date);
strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
if ((creation_date = pdfioFileGetCreationDate(pdf)) > 0)
{
creation_tm = localtime(&creation_date);
strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
}
else
{
snprintf(creation_text, sizeof(creation_text), "-- not set --");
}
// Print file information to stdout...
printf("%s:\n", filename);
printf(" Title: %s\n", pdfioFileGetTitle(pdf));
printf(" Author: %s\n", pdfioFileGetAuthor(pdf));
printf(" Title: %s\n", title ? title : "-- not set --");
printf(" Author: %s\n", author ? author : "-- not set --");
printf(" Created On: %s\n", creation_text);
printf(" Number Pages: %u\n", (unsigned)pdfioFileGetNumPages(pdf));

6
pdfio-file.c
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@ -1,7 +1,7 @@
//
// PDF file functions for PDFio.
//
// Copyright © 2021-2024 by Michael R Sweet.
// Copyright © 2021-2025 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
@ -1938,7 +1938,6 @@ load_xref(
// Save the trailer dictionary and grab the root (catalog) and info
// objects...
pdf->trailer_dict = trailer.value.dict;
pdf->info_obj = pdfioDictGetObj(pdf->trailer_dict, "Info");
pdf->encrypt_obj = pdfioDictGetObj(pdf->trailer_dict, "Encrypt");
pdf->id_array = pdfioDictGetArray(pdf->trailer_dict, "ID");
@ -2086,7 +2085,6 @@ load_xref(
// Save the trailer dictionary and grab the root (catalog) and info
// objects...
pdf->trailer_dict = trailer.value.dict;
pdf->info_obj = pdfioDictGetObj(pdf->trailer_dict, "Info");
pdf->encrypt_obj = pdfioDictGetObj(pdf->trailer_dict, "Encrypt");
pdf->id_array = pdfioDictGetArray(pdf->trailer_dict, "ID");
@ -2123,6 +2121,8 @@ load_xref(
// Once we have all of the xref tables loaded, get the important objects and
// build the pages array...
pdf->info_obj = pdfioDictGetObj(pdf->trailer_dict, "Info");
if ((pdf->root_obj = pdfioDictGetObj(pdf->trailer_dict, "Root")) == NULL)
{
_pdfioFileError(pdf, "Missing Root object.");