diff options
Diffstat (limited to 'include/qpdf/QPDFObjectHandle.hh')
| -rw-r--r-- | include/qpdf/QPDFObjectHandle.hh | 63 |
1 files changed, 39 insertions, 24 deletions
diff --git a/include/qpdf/QPDFObjectHandle.hh b/include/qpdf/QPDFObjectHandle.hh index 030ee11c..a878574b 100644 --- a/include/qpdf/QPDFObjectHandle.hh +++ b/include/qpdf/QPDFObjectHandle.hh @@ -559,27 +559,46 @@ class QPDFObjectHandle QPDF_DLL bool isOrHasName(std::string const&); - // Merge dictionaries with the following behavior, where "object" - // refers to the object whose method is invoked, and "other" - // refers to the argument: - // * If either object or other is not a dictionary, do nothing - // * Otherwise - // * For each key in other - // * If key is absent in object, insert it - // * If key is present in object - // * If both values are dictionaries, merge the dictionary from - // other into the one from object - // * If both values are arrays, append scalar elements from - // other's that are not present in object's onto object's, - // and ignore non-scalar elements in other's - // * Otherwise ignore + // Merge resource dictionaries. Assumes resource dictionaries have + // the property that the collection of keys of all first-level + // dictionary members contains no duplicates. This method does + // nothing if both this object and the other object are not + // dictionaries. Otherwise, it has following behavior, where + // "object" refers to the object whose method is invoked, and + // "other" refers to the argument: + // + // * For each key in "other" whose value is an array: + // * If "object" does not have that entry, shallow copy it. + // * Otherwise, if "object" has an array in the same place, + // append to that array any objects in "other"'s array that + // are not already present. + // * For each key in "other" whose value is a dictionary: + // * If "object" does not have that entry, shallow copy it. + // * Otherwise, for each key in the subdictionary: + // * If key is not present in "object"'s entry, shallow copy it. + // * Otherwise, ignore. Conflicts are not detected. + // // The primary purpose of this method is to facilitate merging of - // resource dictionaries. Conflicts are ignored. If needed, a - // future version of qpdf may provide some mechanism for conflict - // resolution, such as providing a handler that is invoked with - // the path to the conflict. - QPDF_DLL - void mergeDictionary(QPDFObjectHandle other); + // resource dictionaries that are supposed to have the same scope + // as each other. For example, this can be used to merge a form + // XObject's /Resources dictionary with a form field's /DR. + // Conflicts are not detected. If, in the future, there should be + // a need to detect conflicts, this method could detect them and + // return a mapping from old to new names. This mapping could be + // used for filtering the stream. This would be necessary, for + // example, to merge a form XObject's resources with a page's + // resources with the intention of concatenating the content + // streams. + QPDF_DLL + void mergeResources(QPDFObjectHandle other); + + // Get all resource names from a resourcey dictionary. If this + // object is a dctionary, this method returns a set of all the + // keys in all top-level subdictionaries. For resources + // dictionaries, this is the collection of names that may be + // referenced in the content stream. + QPDF_DLL + std::set<std::string> getResourceNames(); // Return the QPDF object that owns an indirect object. Returns // null for a direct object. @@ -992,10 +1011,6 @@ class QPDFObjectHandle ParserCallbacks* callbacks); std::vector<QPDFObjectHandle> arrayOrStreamToStreamArray( std::string const& description, std::string& all_description); - void mergeDictionaryInternal( - QPDFObjectHandle other, - std::set<QPDFObjGen>& visiting, - int depth); static void warn(QPDF*, QPDFExc const&); class Members |