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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
5 changed files with 78 additions and 32 deletions
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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);