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Add placeholder password callback to support reading of encrypted PDF files in the future.

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Michael R Sweet 2021-09-27 08:37:14 -04:00
parent ba9d03ecac
commit 43239eaf8a
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5 changed files with 78 additions and 32 deletions
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31
doc/pdfio.3
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@ -2016,8 +2016,8 @@ CropBox for pages in the PDF file - if \fBNULL\fR then a default "Universal" siz
of 8.27x11in (the intersection of US Letter and ISO A4) is used.
.PP
The "error_cb" and "error_data" arguments specify an error handler callback
and its data pointer - if not specified the default error handler is used
that writes error messages to \fBstderr\fR.
and its data pointer - if \fBNULL\fR the default error handler is used that
writes error messages to \fBstderr\fR.
.SS pdfioFileCreateArrayObj
Create a new object in a PDF file containing an array.
.PP
@ -2196,8 +2196,8 @@ CropBox for pages in the PDF file - if \fBNULL\fR then a default "Universal" siz
of 8.27x11in (the intersection of US Letter and ISO A4) is used.
.PP
The "error_cb" and "error_data" arguments specify an error handler callback
and its data pointer - if not specified the default error handler is used
that writes error messages to \fBstderr\fR.
and its data pointer - if \fBNULL\fR the default error handler is used that
writes error messages to \fBstderr\fR.
.PP
.IP 5
\fINote\fR: Files created using this API are slightly larger than those
@ -2346,16 +2346,25 @@ Open a PDF file for reading.
.nf
pdfio_file_t * pdfioFileOpen (
const char *filename,
pdfio_password_cb_t password_cb,
void *password_data,
pdfio_error_cb_t error_cb,
void *error_data
);
.fi
.PP
This function opens an existing PDF file. The "filename" argument specifies
the name of the PDF file to create. The "error_cb" and "error_data"
arguments specify an error handler callback and its data pointer - if not
specified the default error handler is used that writes error messages to
\fBstderr\fR.
the name of the PDF file to create.
.PP
The "password_cb" and "password_data" arguments specify a password callback
and its data pointer for PDF files that use one of the standard Adobe
"security" handlers. The callback returns a password string or \fBNULL\fR to
cancel the open. If \fBNULL\fR is specified for the callback function and the
PDF file requires a password, the open will always fail.
.PP
The "error_cb" and "error_data" arguments specify an error handler callback
and its data pointer - if \fBNULL\fR the default error handler is used that
writes error messages to \fBstderr\fR.
.SS pdfioFileSetAuthor
Set the author for a PDF file.
.PP
@ -2778,6 +2787,12 @@ Output callback for pdfioFileCreateOutput
.nf
typedef ssize_t(*)(void *ctx const void *data size_t datalen) pdfio_output_cb_t;
.fi
.SS pdfio_password_cb_t
Password callback for pdfioFileOpen
.PP
.nf
typedef const char *(*)(void *data const char *filename) pdfio_password_cb_t;
.fi
.SS pdfio_rect_t
PDF rectangle
.PP

35
doc/pdfio.html
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@ -447,6 +447,7 @@ span.string {
<li><a href="#pdfio_matrix_t[3][2]">pdfio_matrix_t[3][2]</a></li>
<li><a href="#pdfio_obj_t">pdfio_obj_t</a></li>
<li><a href="#pdfio_output_cb_t">pdfio_output_cb_t</a></li>
<li><a href="#pdfio_password_cb_t">pdfio_password_cb_t</a></li>
<li><a href="#pdfio_rect_t">pdfio_rect_t</a></li>
<li><a href="#pdfio_stream_t">pdfio_stream_t</a></li>
<li><a href="#pdfio_textrendering_t">pdfio_textrendering_t</a></li>
@ -2464,8 +2465,8 @@ CropBox for pages in the PDF file - if <code>NULL</code> then a default &quot;Un
of 8.27x11in (the intersection of US Letter and ISO A4) is used.<br>
<br>
The &quot;error_cb&quot; and &quot;error_data&quot; arguments specify an error handler callback
and its data pointer - if not specified the default error handler is used
that writes error messages to <code>stderr</code>.</p>
and its data pointer - if <code>NULL</code> the default error handler is used that
writes error messages to <code>stderr</code>.</p>
<h3 class="function"><a id="pdfioFileCreateArrayObj">pdfioFileCreateArrayObj</a></h3>
<p class="description">Create a new object in a PDF file containing an array.</p>
<p class="code">
@ -2687,8 +2688,8 @@ CropBox for pages in the PDF file - if <code>NULL</code> then a default &quot;Un
of 8.27x11in (the intersection of US Letter and ISO A4) is used.<br>
<br>
The &quot;error_cb&quot; and &quot;error_data&quot; arguments specify an error handler callback
and its data pointer - if not specified the default error handler is used
that writes error messages to <code>stderr</code>.<br>
and its data pointer - if <code>NULL</code> the default error handler is used that
writes error messages to <code>stderr</code>.<br>
<br>
</p><blockquote>
<em>Note</em>: Files created using this API are slightly larger than those
@ -2884,11 +2885,15 @@ const char *pdfioFileGetVersion(<a href="#pdfio_file_t">pdfio_file_t</a> *pdf);<
<h3 class="function"><a id="pdfioFileOpen">pdfioFileOpen</a></h3>
<p class="description">Open a PDF file for reading.</p>
<p class="code">
<a href="#pdfio_file_t">pdfio_file_t</a> *pdfioFileOpen(const char *filename, <a href="#pdfio_error_cb_t">pdfio_error_cb_t</a> error_cb, void *error_data);</p>
<a href="#pdfio_file_t">pdfio_file_t</a> *pdfioFileOpen(const char *filename, <a href="#pdfio_password_cb_t">pdfio_password_cb_t</a> password_cb, void *password_data, <a href="#pdfio_error_cb_t">pdfio_error_cb_t</a> error_cb, void *error_data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>filename</th>
<td class="description">Filename</td></tr>
<tr><th>password_cb</th>
<td class="description">Password callback or <code>NULL</code> for none</td></tr>
<tr><th>password_data</th>
<td class="description">Password callback data, if any</td></tr>
<tr><th>error_cb</th>
<td class="description">Error callback or <code>NULL</code> for default</td></tr>
<tr><th>error_data</th>
@ -2898,10 +2903,17 @@ const char *pdfioFileGetVersion(<a href="#pdfio_file_t">pdfio_file_t</a> *pdf);<
<p class="description">PDF file</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function opens an existing PDF file. The &quot;filename&quot; argument specifies
the name of the PDF file to create. The &quot;error_cb&quot; and &quot;error_data&quot;
arguments specify an error handler callback and its data pointer - if not
specified the default error handler is used that writes error messages to
<code>stderr</code>.</p>
the name of the PDF file to create.<br>
<br>
The &quot;password_cb&quot; and &quot;password_data&quot; arguments specify a password callback
and its data pointer for PDF files that use one of the standard Adobe
&quot;security&quot; handlers. The callback returns a password string or <code>NULL</code> to
cancel the open. If <code>NULL</code> is specified for the callback function and the
PDF file requires a password, the open will always fail.<br>
<br>
The &quot;error_cb&quot; and &quot;error_data&quot; arguments specify an error handler callback
and its data pointer - if <code>NULL</code> the default error handler is used that
writes error messages to <code>stderr</code>.</p>
<h3 class="function"><a id="pdfioFileSetAuthor">pdfioFileSetAuthor</a></h3>
<p class="description">Set the author for a PDF file.</p>
<p class="code">
@ -3425,6 +3437,11 @@ typedef struct _pdfio_obj_s pdfio_obj_t;
<p class="code">
typedef ssize_t (*pdfio_output_cb_t)(void *ctx const void *data size_t datalen);
</p>
<h3 class="typedef"><a id="pdfio_password_cb_t">pdfio_password_cb_t</a></h3>
<p class="description">Password callback for pdfioFileOpen</p>
<p class="code">
typedef const char *(*pdfio_password_cb_t)(void *data const char *filename);
</p>
<h3 class="typedef"><a id="pdfio_rect_t">pdfio_rect_t</a></h3>
<p class="description">PDF rectangle</p>
<p class="code">

34
pdfio-file.c
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@ -177,8 +177,8 @@ pdfioFileClose(pdfio_file_t *pdf) // I - PDF file
// of 8.27x11in (the intersection of US Letter and ISO A4) is used.
//
// The "error_cb" and "error_data" arguments specify an error handler callback
// and its data pointer - if not specified the default error handler is used
// that writes error messages to `stderr`.
// and its data pointer - if `NULL` the default error handler is used that
// writes error messages to `stderr`.
//
pdfio_file_t * // O - PDF file or `NULL` on error
@ -437,8 +437,8 @@ _pdfioFileCreateObj(
// of 8.27x11in (the intersection of US Letter and ISO A4) is used.
//
// The "error_cb" and "error_data" arguments specify an error handler callback
// and its data pointer - if not specified the default error handler is used
// that writes error messages to `stderr`.
// and its data pointer - if `NULL` the default error handler is used that
// writes error messages to `stderr`.
//
// > *Note*: Files created using this API are slightly larger than those
// > created using the @link pdfioFileCreate@ function since stream lengths are
@ -863,17 +863,26 @@ pdfioFileGetVersion(
// 'pdfioFileOpen()' - Open a PDF file for reading.
//
// This function opens an existing PDF file. The "filename" argument specifies
// the name of the PDF file to create. The "error_cb" and "error_data"
// arguments specify an error handler callback and its data pointer - if not
// specified the default error handler is used that writes error messages to
// `stderr`.
// the name of the PDF file to create.
//
// The "password_cb" and "password_data" arguments specify a password callback
// and its data pointer for PDF files that use one of the standard Adobe
// "security" handlers. The callback returns a password string or `NULL` to
// cancel the open. If `NULL` is specified for the callback function and the
// PDF file requires a password, the open will always fail.
//
// The "error_cb" and "error_data" arguments specify an error handler callback
// and its data pointer - if `NULL` the default error handler is used that
// writes error messages to `stderr`.
//
pdfio_file_t * // O - PDF file
pdfioFileOpen(
const char *filename, // I - Filename
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_data) // I - Error callback data, if any
const char *filename, // I - Filename
pdfio_password_cb_t password_cb, // I - Password callback or `NULL` for none
void *password_data, // I - Password callback data, if any
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_data) // I - Error callback data, if any
{
pdfio_file_t *pdf; // PDF file
char line[1024], // Line from file
@ -881,6 +890,9 @@ pdfioFileOpen(
off_t xref_offset; // Offset to xref table
(void)password_cb;
(void)password_data;
// Range check input...
if (!filename)
return (NULL);

4
pdfio.h
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@ -76,6 +76,8 @@ typedef enum pdfio_filter_e // Compression/decompression filters for streams
typedef struct _pdfio_obj_s pdfio_obj_t;// Numbered object in PDF file
typedef ssize_t (*pdfio_output_cb_t)(void *ctx, const void *data, size_t datalen);
// Output callback for pdfioFileCreateOutput
typedef const char *(*pdfio_password_cb_t)(void *data, const char *filename);
// Password callback for pdfioFileOpen
typedef struct pdfio_rect_s // PDF rectangle
{
double x1; // Lower-left X coordinate
@ -176,7 +178,7 @@ extern const char *pdfioFileGetProducer(pdfio_file_t *pdf) _PDFIO_PUBLIC;
extern const char *pdfioFileGetSubject(pdfio_file_t *pdf) _PDFIO_PUBLIC;
extern const char *pdfioFileGetTitle(pdfio_file_t *pdf) _PDFIO_PUBLIC;
extern const char *pdfioFileGetVersion(pdfio_file_t *pdf) _PDFIO_PUBLIC;
extern pdfio_file_t *pdfioFileOpen(const char *filename, pdfio_error_cb_t error_cb, void *error_data) _PDFIO_PUBLIC;
extern pdfio_file_t *pdfioFileOpen(const char *filename, pdfio_password_cb_t password_cb, void *password_data, pdfio_error_cb_t error_cb, void *error_data) _PDFIO_PUBLIC;
extern void pdfioFileSetAuthor(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
extern void pdfioFileSetCreationDate(pdfio_file_t *pdf, time_t value) _PDFIO_PUBLIC;
extern void pdfioFileSetCreator(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;

6
testpdfio.c
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@ -136,7 +136,7 @@ do_test_file(const char *filename, // I - PDF filename
fflush(stdout);
}
if ((pdf = pdfioFileOpen(filename, (pdfio_error_cb_t)error_cb, &error)) != NULL)
if ((pdf = pdfioFileOpen(filename, /*password_cb*/NULL, /*password_data*/NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
{
if (objnum)
{
@ -715,7 +715,7 @@ do_unit_tests(void)
// First open the test PDF file...
fputs("pdfioFileOpen(\"testfiles/testpdfio.pdf\"): ", stdout);
if ((inpdf = pdfioFileOpen("testfiles/testpdfio.pdf", (pdfio_error_cb_t)error_cb, &error)) != NULL)
if ((inpdf = pdfioFileOpen("testfiles/testpdfio.pdf", /*password_cb*/NULL, /*password_data*/NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
puts("PASS");
else
return (1);
@ -898,7 +898,7 @@ read_unit_file(const char *filename, // I - File to read
// Open the new PDF file to read it...
printf("pdfioFileOpen(\"%s\", ...): ", filename);
if ((pdf = pdfioFileOpen(filename, (pdfio_error_cb_t)error_cb, &error)) != NULL)
if ((pdf = pdfioFileOpen(filename, /*password_cb*/NULL, /*password_data*/NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
puts("PASS");
else
return (1);