p/pdf-simple-sign
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Try to return the innermost error message

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Improving debugging experience.
This commit is contained in:
Přemysl Eric Janouch 2018-10-03 22:46:38 +02:00
parent c77a9c052a
commit 4c7853c951
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 11 additions and 5 deletions
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16
pdf-simple-sign.cpp
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@ -353,6 +353,12 @@ public:
// -------------------------------------------------------------------------------------------------
/// If the object is an error, forward its message, otherwise return err.
static std::string pdf_error(const pdf_object& o, const char* err) {
if (o.type != pdf_object::END || o.string.empty()) return err;
return o.string;
}
pdf_object pdf_updater::parse_obj(pdf_lexer& lex, std::vector<pdf_object>& stack) const {
if (stack.size() < 2)
return {pdf_object::END, "missing object ID pair"};
@ -370,7 +376,7 @@ pdf_object pdf_updater::parse_obj(pdf_lexer& lex, std::vector<pdf_object>& stack
while (1) {
auto object = parse(lex, obj.array);
if (object.type == pdf_object::END)
return {pdf_object::END, "object doesn't end"};
return {pdf_object::END, pdf_error(object, "object doesn't end")};
if (object.type == pdf_object::KEYWORD && object.string == "endobj")
break;
obj.array.push_back(std::move(object));
@ -408,7 +414,7 @@ pdf_object pdf_updater::parse(pdf_lexer& lex, std::vector<pdf_object>& stack) co
while (1) {
auto object = parse(lex, array);
if (object.type == pdf_object::END)
return {pdf_object::END, "array doesn't end"};
return {pdf_object::END, pdf_error(object, "array doesn't end")};
if (object.type == pdf_object::E_ARRAY)
break;
array.push_back(std::move(object));
@ -421,7 +427,7 @@ pdf_object pdf_updater::parse(pdf_lexer& lex, std::vector<pdf_object>& stack) co
while (1) {
auto object = parse(lex, array);
if (object.type == pdf_object::END)
return {pdf_object::END, "dictionary doesn't end"};
return {pdf_object::END, pdf_error(object, "dictionary doesn't end")};
if (object.type == pdf_object::E_DICT)
break;
array.push_back(std::move(object));
@ -459,7 +465,7 @@ std::string pdf_updater::load_xref(pdf_lexer& lex, std::set<uint>& loaded_entrie
while (1) {
auto object = parse(lex, throwaway_stack);
if (object.type == pdf_object::END)
return "unexpected EOF while looking for the trailer";
return pdf_error(object, "unexpected EOF while looking for the trailer");
if (object.type == pdf_object::KEYWORD && object.string == "trailer")
break;
@ -529,7 +535,7 @@ std::string pdf_updater::initialize() {
auto trailer = parse(lex, throwaway_stack);
if (trailer.type != pdf_object::DICT)
return "invalid trailer dictionary";
return pdf_error(trailer, "invalid trailer dictionary");
if (loaded_xrefs.empty())
this->trailer = trailer.dict;
loaded_xrefs.insert(xref_offset);