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Fix pdfioFileGetAuthor, etc. APIs (Issue #33)

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Michael R Sweet
2022-07-12 18:36:08 -04:00
parent 26d485cfc5
commit a3f3bbfe11
4 changed files with 164 additions and 8 deletions
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60
pdfio-file.c
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@ -24,6 +24,7 @@
static pdfio_obj_t *add_obj(pdfio_file_t *pdf, size_t number, unsigned short generation, off_t offset);
static int compare_objmaps(_pdfio_objmap_t *a, _pdfio_objmap_t *b);
static int compare_objs(pdfio_obj_t **a, pdfio_obj_t **b);
static const char *get_info_string(pdfio_file_t *pdf, const char *key);
static bool load_obj_stream(pdfio_obj_t *obj);
static bool load_pages(pdfio_file_t *pdf, pdfio_obj_t *obj, size_t depth);
static bool load_xref(pdfio_file_t *pdf, off_t xref_offset, pdfio_password_cb_t password_cb, void *password_data);
@ -892,7 +893,7 @@ pdfioFileFindObj(
const char * // O - Author or `NULL` for none
pdfioFileGetAuthor(pdfio_file_t *pdf) // I - PDF file
{
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Author") : NULL);
return (get_info_string(pdf, "Author"));
}
@ -904,7 +905,7 @@ time_t // O - Creation date or `0` for none
pdfioFileGetCreationDate(
pdfio_file_t *pdf) // I - PDF file
{
return (pdf && pdf->info_obj ? pdfioDictGetDate(pdf->info_obj->value.value.dict, "CreationDate") : 0);
return (pdf && pdf->info_obj ? pdfioDictGetDate(pdfioObjGetDict(pdf->info_obj), "CreationDate") : 0);
}
@ -915,7 +916,7 @@ pdfioFileGetCreationDate(
const char * // O - Creator string or `NULL` for none
pdfioFileGetCreator(pdfio_file_t *pdf) // I - PDF file
{
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Creator") : NULL);
return (get_info_string(pdf, "Creator"));
}
@ -937,7 +938,7 @@ pdfioFileGetID(pdfio_file_t *pdf) // I - PDF file
const char * // O - Keywords string or `NULL` for none
pdfioFileGetKeywords(pdfio_file_t *pdf) // I - PDF file
{
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Keywords") : NULL);
return (get_info_string(pdf, "Keywords"));
}
@ -1041,7 +1042,7 @@ pdfioFileGetPermissions(
const char * // O - Producer string or `NULL` for none
pdfioFileGetProducer(pdfio_file_t *pdf) // I - PDF file
{
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Producer") : NULL);
return (get_info_string(pdf, "Producer"));
}
@ -1052,7 +1053,7 @@ pdfioFileGetProducer(pdfio_file_t *pdf) // I - PDF file
const char * // O - Subject or `NULL` for none
pdfioFileGetSubject(pdfio_file_t *pdf) // I - PDF file
{
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Subject") : NULL);
return (get_info_string(pdf, "Subject"));
}
@ -1063,7 +1064,7 @@ pdfioFileGetSubject(pdfio_file_t *pdf) // I - PDF file
const char * // O - Title or `NULL` for none
pdfioFileGetTitle(pdfio_file_t *pdf) // I - PDF file
{
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Title") : NULL);
return (get_info_string(pdf, "Title"));
}
@ -1406,6 +1407,51 @@ compare_objs(pdfio_obj_t **a, // I - First object
}
//
// 'get_info_string()' - Get a string value from the Info dictionary.
//
// This function also handles converting binary strings to C strings, which
// occur in encrypted PDF files.
//
static const char * // O - String or `NULL` if not found
get_info_string(pdfio_file_t *pdf, // I - PDF file
const char *key) // I - Dictionary key
{
pdfio_dict_t *dict; // Info dictionary
_pdfio_value_t *value; // Value
// Range check input...
if (!pdf || !pdf->info_obj || (dict = pdfioObjGetDict(pdf->info_obj)) == NULL || (value = _pdfioDictGetValue(dict, key)) == NULL)
return (NULL);
// If we already have a value, return it...
if (value->type == PDFIO_VALTYPE_NAME || value->type == PDFIO_VALTYPE_STRING)
{
return (value->value.string);
}
else if (value->type == PDFIO_VALTYPE_BINARY && value->value.binary.datalen < 4096)
{
// Convert binary string to regular string...
char temp[4096]; // Temporary string
memcpy(temp, value->value.binary.data, value->value.binary.datalen);
temp[value->value.binary.datalen] = '\0';
free(value->value.binary.data);
value->type = PDFIO_VALTYPE_STRING;
value->value.string = pdfioStringCreate(pdf, temp);
return (value->value.string);
}
else
{
// Something else that is not a string...
return (NULL);
}
}
//
// 'load_obj_stream()' - Load an object stream.
//