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Add private methods QPDF::damagedPDF

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This commit is contained in:
m-holger 2022-09-28 12:25:52 +01:00 committed by Jay Berkenbilt
parent b948366280
commit 5ccab4be03
5 changed files with 217 additions and 392 deletions
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16
include/qpdf/QPDF.hh
View File

@ -1194,6 +1194,22 @@ class QPDF
std::shared_ptr<QPDFObject> const& object,
qpdf_offset_t end_before_space,
qpdf_offset_t end_after_space);
static QPDFExc damagedPDF(
std::shared_ptr<InputSource> const& input,
std::string const& object,
qpdf_offset_t offset,
std::string const& message);
QPDFExc damagedPDF(
std::shared_ptr<InputSource> const& input,
qpdf_offset_t offset,
std::string const& message);
QPDFExc damagedPDF(
std::string const& object,
qpdf_offset_t offset,
std::string const& message);
QPDFExc damagedPDF(std::string const& object, std::string const& message);
QPDFExc damagedPDF(qpdf_offset_t offset, std::string const& message);
QPDFExc damagedPDF(std::string const& message);
// Calls finish() on the pipeline when done but does not delete it
bool pipeStreamData(

460
libqpdf/QPDF.cc
View File

@ -481,7 +481,7 @@ QPDF::parse(char const* password)
PatternFinder hf(*this, &QPDF::findHeader);
if (!this->m->file->findFirst("%PDF-", 0, 1024, hf)) {
QTC::TC("qpdf", "QPDF not a pdf file");
warn(qpdf_e_damaged_pdf, "", 0, "can't find PDF header");
warn(damagedPDF("", 0, "can't find PDF header"));
// QPDFWriter writes files that usually require at least
// version 1.2 for /FlateDecode
this->m->pdf_version = "1.2";
@ -503,24 +503,15 @@ QPDF::parse(char const* password)
try {
if (xref_offset == 0) {
QTC::TC("qpdf", "QPDF can't find startxref");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
0,
"can't find startxref");
throw damagedPDF("", 0, "can't find startxref");
}
try {
read_xref(xref_offset);
} catch (QPDFExc&) {
throw;
} catch (std::exception& e) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
0,
std::string("error reading xref: ") + e.what());
throw damagedPDF(
"", 0, std::string("error reading xref: ") + e.what());
}
} catch (QPDFExc& e) {
if (this->m->attempt_recovery) {
@ -589,13 +580,9 @@ QPDF::reconstruct_xref(QPDFExc& e)
this->m->reconstructed_xref = true;
warn(qpdf_e_damaged_pdf, "", 0, "file is damaged");
warn(damagedPDF("", 0, "file is damaged"));
warn(e);
warn(
qpdf_e_damaged_pdf,
"",
0,
"Attempting to reconstruct cross-reference table");
warn(damagedPDF("", 0, "Attempting to reconstruct cross-reference table"));
// Delete all references to type 1 (uncompressed) objects
std::set<QPDFObjGen> to_delete;
@ -655,13 +642,10 @@ QPDF::reconstruct_xref(QPDFExc& e)
// with bad startxref pointers even when they have object
// streams.
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"",
0,
"unable to find trailer "
"dictionary while recovering damaged file");
"unable to find trailer dictionary while recovering damaged file");
}
// We could iterate through the objects looking for streams and
@ -716,11 +700,8 @@ QPDF::read_xref(qpdf_offset_t xref_offset)
if ((strncmp(buf, "xref", 4) == 0) && QUtil::is_space(buf[4])) {
if (skipped_space) {
QTC::TC("qpdf", "QPDF xref skipped space");
warn(
qpdf_e_damaged_pdf,
"",
0,
"extraneous whitespace seen before xref");
warn(damagedPDF(
"", 0, "extraneous whitespace seen before xref"));
}
QTC::TC(
"qpdf",
@ -741,22 +722,12 @@ QPDF::read_xref(qpdf_offset_t xref_offset)
}
if (visited.count(xref_offset) != 0) {
QTC::TC("qpdf", "QPDF xref loop");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
0,
"loop detected following xref tables");
throw damagedPDF("", 0, "loop detected following xref tables");
}
}
if (!this->m->trailer.isInitialized()) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
0,
"unable to find trailer while reading xref");
throw damagedPDF("", 0, "unable to find trailer while reading xref");
}
int size = this->m->trailer.getKey("/Size").getIntValueAsInt();
int max_obj = 0;
@ -768,14 +739,12 @@ QPDF::read_xref(qpdf_offset_t xref_offset)
}
if ((size < 1) || (size - 1 != max_obj)) {
QTC::TC("qpdf", "QPDF xref size mismatch");
warn(
qpdf_e_damaged_pdf,
warn(damagedPDF(
"",
0,
(std::string("reported number of objects (") +
std::to_string(size) +
("reported number of objects (" + std::to_string(size) +
") is not one plus the highest object number (" +
std::to_string(max_obj) + ")"));
std::to_string(max_obj) + ")")));
}
// We no longer need the deleted_objects table, so go ahead and
@ -899,11 +868,7 @@ QPDF::parse_xrefEntry(
}
if (invalid) {
warn(
qpdf_e_damaged_pdf,
"xref table",
this->m->file->getLastOffset(),
"accepting invalid xref table entry");
warn(damagedPDF("xref table", "accepting invalid xref table entry"));
}
f1 = QUtil::string_to_ll(f1_str.c_str());
@ -929,12 +894,7 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
int bytes = 0;
if (!parse_xrefFirst(line, obj, num, bytes)) {
QTC::TC("qpdf", "QPDF invalid xref");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"xref table",
this->m->file->getLastOffset(),
"xref syntax invalid");
throw damagedPDF("xref table", "xref syntax invalid");
}
this->m->file->seek(this->m->file->getLastOffset() + bytes, SEEK_SET);
for (qpdf_offset_t i = obj; i - num < obj; ++i) {
@ -949,11 +909,8 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
char type = '\0';
if (!parse_xrefEntry(xref_entry, f1, f2, type)) {
QTC::TC("qpdf", "QPDF invalid xref entry");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref table",
this->m->file->getLastOffset(),
"invalid xref entry (obj=" + std::to_string(i) + ")");
}
if (type == 'f') {
@ -978,12 +935,7 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
readObject(this->m->file, "trailer", QPDFObjGen(), false);
if (!cur_trailer.isDictionary()) {
QTC::TC("qpdf", "QPDF missing trailer");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
this->m->file->getLastOffset(),
"expected trailer dictionary");
throw damagedPDF("", "expected trailer dictionary");
}
if (!this->m->trailer.isInitialized()) {
@ -991,22 +943,12 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
if (!this->m->trailer.hasKey("/Size")) {
QTC::TC("qpdf", "QPDF trailer lacks size");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"trailer",
this->m->file->getLastOffset(),
"trailer dictionary lacks /Size key");
throw damagedPDF("trailer", "trailer dictionary lacks /Size key");
}
if (!this->m->trailer.getKey("/Size").isInteger()) {
QTC::TC("qpdf", "QPDF trailer size not integer");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"trailer",
this->m->file->getLastOffset(),
"/Size key in trailer dictionary is not "
"an integer");
throw damagedPDF(
"trailer", "/Size key in trailer dictionary is not an integer");
}
}
@ -1021,12 +963,8 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
(void)read_xrefStream(
cur_trailer.getKey("/XRefStm").getIntValue());
} else {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"xref stream",
xref_offset,
"invalid /XRefStm");
throw damagedPDF(
"xref stream", xref_offset, "invalid /XRefStm");
}
}
}
@ -1039,13 +977,8 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
if (cur_trailer.hasKey("/Prev")) {
if (!cur_trailer.getKey("/Prev").isInteger()) {
QTC::TC("qpdf", "QPDF trailer prev not integer");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"trailer",
this->m->file->getLastOffset(),
"/Prev key in trailer dictionary is not "
"an integer");
throw damagedPDF(
"trailer", "/Prev key in trailer dictionary is not an integer");
}
QTC::TC("qpdf", "QPDF prev key in trailer dictionary");
xref_offset = cur_trailer.getKey("/Prev").getIntValue();
@ -1078,12 +1011,7 @@ QPDF::read_xrefStream(qpdf_offset_t xref_offset)
if (!found) {
QTC::TC("qpdf", "QPDF can't find xref");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
xref_offset,
"xref not found");
throw damagedPDF("", xref_offset, "xref not found");
}
return xref_offset;
@ -1101,13 +1029,10 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle& xref_obj)
W_obj.getArrayItem(2).isInteger() &&
dict.getKey("/Size").isInteger() &&
(Index_obj.isArray() || Index_obj.isNull()))) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
xref_offset,
"Cross-reference stream does not have"
" proper /W and /Index keys");
"Cross-reference stream does not have proper /W and /Index keys");
}
int W[3];
@ -1116,24 +1041,18 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle& xref_obj)
for (int i = 0; i < 3; ++i) {
W[i] = W_obj.getArrayItem(i).getIntValueAsInt();
if (W[i] > max_bytes) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
xref_offset,
"Cross-reference stream's /W contains"
" impossibly large values");
"Cross-reference stream's /W contains impossibly large values");
}
entry_size += toS(W[i]);
}
if (entry_size == 0) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
xref_offset,
"Cross-reference stream's /W indicates"
" entry size of 0");
"Cross-reference stream's /W indicates entry size of 0");
}
unsigned long long max_num_entries =
static_cast<unsigned long long>(-1) / entry_size;
@ -1142,21 +1061,17 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle& xref_obj)
if (Index_obj.isArray()) {
int n_index = Index_obj.getArrayNItems();
if ((n_index % 2) || (n_index < 2)) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
xref_offset,
"Cross-reference stream's /Index has an"
" invalid number of values");
"Cross-reference stream's /Index has an invalid number of "
"values");
}
for (int i = 0; i < n_index; ++i) {
if (Index_obj.getArrayItem(i).isInteger()) {
indx.push_back(Index_obj.getArrayItem(i).getIntValue());
} else {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
xref_offset,
("Cross-reference stream's /Index's item " +
@ -1174,13 +1089,10 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle& xref_obj)
size_t num_entries = 0;
for (size_t i = 1; i < indx.size(); i += 2) {
if (indx.at(i) > QIntC::to_longlong(max_num_entries - num_entries)) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
xref_offset,
("Cross-reference stream claims to contain"
" too many entries: " +
("Cross-reference stream claims to contain too many entries: " +
std::to_string(indx.at(i)) + " " +
std::to_string(max_num_entries) + " " +
std::to_string(num_entries)));
@ -1196,13 +1108,10 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle& xref_obj)
size_t actual_size = bp->getSize();
if (expected_size != actual_size) {
QPDFExc x(
qpdf_e_damaged_pdf,
this->m->file->getName(),
QPDFExc x = damagedPDF(
"xref stream",
xref_offset,
("Cross-reference stream data has the wrong size;"
" expected = " +
("Cross-reference stream data has the wrong size; expected = " +
std::to_string(expected_size) +
"; actual = " + std::to_string(actual_size)));
if (expected_size > actual_size) {
@ -1286,13 +1195,9 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle& xref_obj)
if (dict.hasKey("/Prev")) {
if (!dict.getKey("/Prev").isInteger()) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
this->m->file->getLastOffset(),
"/Prev key in xref stream dictionary is not "
"an integer");
"/Prev key in xref stream dictionary is not an integer");
}
QTC::TC("qpdf", "QPDF prev key in xref stream dictionary");
xref_offset = dict.getKey("/Prev").getIntValue();
@ -1351,11 +1256,8 @@ QPDF::insertXrefEntry(int obj, int f0, qpdf_offset_t f1, int f2, bool overwrite)
break;
default:
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"xref stream",
this->m->file->getLastOffset(),
"unknown xref stream entry type " + std::to_string(f0));
break;
}
@ -1522,12 +1424,8 @@ QPDF::readObject(
// Nothing in the PDF spec appears to allow empty objects, but
// they have been encountered in actual PDF files and Adobe
// Reader appears to ignore them.
warn(QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
input->getLastOffset(),
"empty object treated as null"));
warn(damagedPDF(
input, input->getLastOffset(), "empty object treated as null"));
} else if (object.isDictionary() && (!in_object_stream)) {
// check for stream
qpdf_offset_t cur_offset = input->tell();
@ -1569,34 +1467,27 @@ QPDF::readObject(
// of not having seen a newline.
QTC::TC("qpdf", "QPDF stream with CR only");
input->unreadCh(ch);
warn(QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
warn(damagedPDF(
input,
input->tell(),
"stream keyword followed"
" by carriage return only"));
"stream keyword followed by carriage return "
"only"));
}
}
} else if (QUtil::is_space(ch)) {
warn(QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
warn(damagedPDF(
input,
input->tell(),
"stream keyword followed by"
" extraneous whitespace"));
"stream keyword followed by extraneous whitespace"));
done = false;
} else {
QTC::TC("qpdf", "QPDF stream without newline");
input->unreadCh(ch);
warn(QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
warn(damagedPDF(
input,
input->tell(),
"stream keyword not followed"
" by proper line terminator"));
"stream keyword not followed by proper line "
"terminator"));
}
}
@ -1612,21 +1503,15 @@ QPDF::readObject(
if (dict.count("/Length") == 0) {
QTC::TC("qpdf", "QPDF stream without length");
throw QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
offset,
"stream dictionary lacks /Length key");
throw damagedPDF(
input, offset, "stream dictionary lacks /Length key");
}
QPDFObjectHandle length_obj = dict["/Length"];
if (!length_obj.isInteger()) {
QTC::TC("qpdf", "QPDF stream length not integer");
throw QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
throw damagedPDF(
input,
offset,
"/Length key in stream dictionary is not "
"an integer");
@ -1640,12 +1525,8 @@ QPDF::readObject(
QPDFTokenizer::Token(
QPDFTokenizer::tt_word, "endstream"))) {
QTC::TC("qpdf", "QPDF missing endstream");
throw QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
input->getLastOffset(),
"expected endstream");
throw damagedPDF(
input, input->getLastOffset(), "expected endstream");
}
} catch (QPDFExc& e) {
if (this->m->attempt_recovery) {
@ -1689,12 +1570,8 @@ QPDF::recoverStreamLength(
{
// Try to reconstruct stream length by looking for
// endstream or endobj
warn(QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
stream_offset,
"attempting to recover stream length"));
warn(damagedPDF(
input, stream_offset, "attempting to recover stream length"));
PatternFinder ef(*this, &QPDF::findEndstream);
size_t length = 0;
@ -1734,18 +1611,13 @@ QPDF::recoverStreamLength(
}
if (length == 0) {
warn(QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
warn(damagedPDF(
input,
stream_offset,
"unable to recover stream data;"
" treating stream as empty"));
"unable to recover stream data; treating stream as empty"));
} else {
warn(QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
warn(damagedPDF(
input,
stream_offset,
"recovered stream length: " + std::to_string(length)));
}
@ -1795,11 +1667,7 @@ QPDF::readObjectAtOffset(
// ignore these.
if (offset == 0) {
QTC::TC("qpdf", "QPDF bogus 0 offset", 0);
warn(
qpdf_e_damaged_pdf,
this->m->last_object_description,
0,
"object has offset 0");
warn(damagedPDF(0, "object has offset 0"));
return QPDFObjectHandle::newNull();
}
@ -1820,33 +1688,19 @@ QPDF::readObjectAtOffset(
try {
if (!(objidok && genok && objok)) {
QTC::TC("qpdf", "QPDF expected n n obj");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
offset,
"expected n n obj");
throw damagedPDF(offset, "expected n n obj");
}
int objid = QUtil::string_to_int(tobjid.getValue().c_str());
int generation = QUtil::string_to_int(tgen.getValue().c_str());
og = QPDFObjGen(objid, generation);
if (objid == 0) {
QTC::TC("qpdf", "QPDF object id 0");
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
offset,
"object with ID 0");
throw damagedPDF(offset, "object with ID 0");
}
if (check_og && (exp_og != og)) {
QTC::TC("qpdf", "QPDF err wrong objid/generation");
QPDFExc e(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
offset,
(std::string("expected ") + exp_og.unparse(' ') + " obj"));
QPDFExc e =
damagedPDF(offset, "expected " + exp_og.unparse(' ') + " obj");
if (try_recovery) {
// Will be retried below
throw e;
@ -1870,14 +1724,12 @@ QPDF::readObjectAtOffset(
return result;
} else {
QTC::TC("qpdf", "QPDF object gone after xref reconstruction");
warn(
qpdf_e_damaged_pdf,
warn(damagedPDF(
"",
0,
std::string(
"object " + exp_og.unparse(' ') +
" not found in file after regenerating"
" cross reference table"));
("object " + exp_og.unparse(' ') +
" not found in file after regenerating cross reference "
"table")));
return QPDFObjectHandle::newNull();
}
} else {
@ -1890,11 +1742,7 @@ QPDF::readObjectAtOffset(
if (!(readToken(this->m->file) ==
QPDFTokenizer::Token(QPDFTokenizer::tt_word, "endobj"))) {
QTC::TC("qpdf", "QPDF err expected endobj");
warn(
qpdf_e_damaged_pdf,
this->m->last_object_description,
this->m->file->getLastOffset(),
"expected endobj");
warn(damagedPDF("expected endobj"));
}
if (isUnresolved(og)) {
@ -1919,12 +1767,7 @@ QPDF::readObjectAtOffset(
break;
}
} else {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
this->m->file->tell(),
"EOF after endobj");
throw damagedPDF(m->file->tell(), "EOF after endobj");
}
}
qpdf_offset_t end_after_space = this->m->file->tell();
@ -1950,11 +1793,8 @@ QPDF::resolve(QPDFObjGen const& og)
// indirectly in some key that has to be resolved during
// object parsing, such as stream length.
QTC::TC("qpdf", "QPDF recursion loop in resolve");
warn(
qpdf_e_damaged_pdf,
"",
this->m->file->getLastOffset(),
("loop detected resolving object " + og.unparse(' ')));
warn(damagedPDF(
"", "loop detected resolving object " + og.unparse(' ')));
updateCache(og, QPDF_Null::create(), -1, -1);
return;
}
@ -1979,9 +1819,7 @@ QPDF::resolve(QPDFObjGen const& og)
break;
default:
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"",
0,
("object " + og.unparse('/') +
@ -1990,12 +1828,11 @@ QPDF::resolve(QPDFObjGen const& og)
} catch (QPDFExc& e) {
warn(e);
} catch (std::exception& e) {
warn(
qpdf_e_damaged_pdf,
warn(damagedPDF(
"",
0,
("object " + og.unparse('/') +
": error reading object: " + e.what()));
": error reading object: " + e.what())));
}
}
@ -2021,13 +1858,9 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
// Force resolution of object stream
QPDFObjectHandle obj_stream = getObjectByID(obj_stream_number, 0);
if (!obj_stream.isStream()) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
this->m->file->getLastOffset(),
("supposed object stream " + std::to_string(obj_stream_number) +
" is not a stream"));
throw damagedPDF(
"supposed object stream " + std::to_string(obj_stream_number) +
" is not a stream");
}
// For linearization data in the object, use the data from the
@ -2041,20 +1874,13 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
QPDFObjectHandle dict = obj_stream.getDict();
if (!dict.isDictionaryOfType("/ObjStm")) {
QTC::TC("qpdf", "QPDF ERR object stream with wrong type");
warn(
qpdf_e_damaged_pdf,
this->m->last_object_description,
this->m->file->getLastOffset(),
("supposed object stream " + std::to_string(obj_stream_number) +
" has wrong type"));
warn(damagedPDF(
"supposed object stream " + std::to_string(obj_stream_number) +
" has wrong type"));
}
if (!(dict.getKey("/N").isInteger() && dict.getKey("/First").isInteger())) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
this->m->file->getLastOffset(),
throw damagedPDF(
("object stream " + std::to_string(obj_stream_number) +
" has incorrect keys"));
}
@ -2077,10 +1903,8 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
QPDFTokenizer::Token toffset = readToken(input);
if (!((tnum.getType() == QPDFTokenizer::tt_integer) &&
(toffset.getType() == QPDFTokenizer::tt_integer))) {
throw QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
this->m->last_object_description,
throw damagedPDF(
input,
input->getLastOffset(),
"expected integer in object stream header");
}
@ -2618,12 +2442,7 @@ QPDF::getRoot()
{
QPDFObjectHandle root = this->m->trailer.getKey("/Root");
if (!root.isDictionary()) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
0,
"unable to find /Root dictionary");
throw damagedPDF("", 0, "unable to find /Root dictionary");
}
return root;
}
@ -2751,9 +2570,8 @@ QPDF::pipeStreamData(
size_t to_read = (sizeof(buf) < length ? sizeof(buf) : length);
size_t len = file->read(buf, to_read);
if (len == 0) {
throw QPDFExc(
qpdf_e_damaged_pdf,
file->getName(),
throw damagedPDF(
file,
"",
file->getLastOffset(),
"unexpected EOF reading stream data");
@ -2772,9 +2590,8 @@ QPDF::pipeStreamData(
QTC::TC("qpdf", "QPDF decoding error warning");
qpdf_for_warning.warn(
// line-break
QPDFExc(
qpdf_e_damaged_pdf,
file->getName(),
damagedPDF(
file,
"",
file->getLastOffset(),
("error decoding stream data for object " +
@ -2782,9 +2599,8 @@ QPDF::pipeStreamData(
if (will_retry) {
qpdf_for_warning.warn(
// line-break
QPDFExc(
qpdf_e_damaged_pdf,
file->getName(),
damagedPDF(
file,
"",
file->getLastOffset(),
"stream will be re-processed without"
@ -2848,18 +2664,72 @@ QPDF::pipeForeignStreamData(
will_retry);
}
// Throw a generic exception when we lack context for something
// more specific. New code should not use this. This method exists
// to improve somewhat from calling assert in very old code.
void
QPDF::stopOnError(std::string const& message)
{
// Throw a generic exception when we lack context for something
// more specific. New code should not use this. This method exists
// to improve somewhat from calling assert in very old code.
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"",
this->m->file->getLastOffset(),
message);
throw damagedPDF("", message);
}
// Return an exception of type qpdf_e_damaged_pdf.
QPDFExc
QPDF::damagedPDF(
std::shared_ptr<InputSource> const& input,
std::string const& object,
qpdf_offset_t offset,
std::string const& message)
{
return QPDFExc(
qpdf_e_damaged_pdf, input->getName(), object, offset, message);
}
// Return an exception of type qpdf_e_damaged_pdf. The object is taken from
// m->last_object_description.
QPDFExc
QPDF::damagedPDF(
std::shared_ptr<InputSource> const& input,
qpdf_offset_t offset,
std::string const& message)
{
return damagedPDF(input, m->last_object_description, offset, message);
}
// Return an exception of type qpdf_e_damaged_pdf. The filename is taken from
// m->file.
QPDFExc
QPDF::damagedPDF(
std::string const& object, qpdf_offset_t offset, std::string const& message)
{
return QPDFExc(
qpdf_e_damaged_pdf, m->file->getName(), object, offset, message);
}
// Return an exception of type qpdf_e_damaged_pdf. The filename is taken from
// m->file and the offset from .m->file->getLastOffset().
QPDFExc
QPDF::damagedPDF(std::string const& object, std::string const& message)
{
return damagedPDF(object, m->file->getLastOffset(), message);
}
// Return an exception of type qpdf_e_damaged_pdf. The filename is taken from
// m->file and the object from .m->last_object_description.
QPDFExc
QPDF::damagedPDF(qpdf_offset_t offset, std::string const& message)
{
return damagedPDF(m->last_object_description, offset, message);
}
// Return an exception of type qpdf_e_damaged_pdf. The filename is taken from
// m->file, the object from m->last_object_description and the offset from
// m->file->getLastOffset().
QPDFExc
QPDF::damagedPDF(std::string const& message)
{
return damagedPDF(
m->last_object_description, m->file->getLastOffset(), message);
}
bool

75
libqpdf/QPDF_encryption.cc
View File

@ -804,21 +804,12 @@ QPDF::initializeEncryption()
// Treating a missing ID as the empty string enables qpdf to
// decrypt some invalid encrypted files with no /ID that
// poppler can read but Adobe Reader can't.
warn(
qpdf_e_damaged_pdf,
"trailer",
this->m->file->getLastOffset(),
"invalid /ID in trailer dictionary");
warn(damagedPDF("trailer", "invalid /ID in trailer dictionary"));
}
QPDFObjectHandle encryption_dict = this->m->trailer.getKey("/Encrypt");
if (!encryption_dict.isDictionary()) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
this->m->file->getLastOffset(),
"/Encrypt in trailer dictionary is not a dictionary");
throw damagedPDF("/Encrypt in trailer dictionary is not a dictionary");
}
if (!(encryption_dict.getKey("/Filter").isName() &&
@ -835,8 +826,7 @@ QPDF::initializeEncryption()
qpdf_e_unsupported,
"encryption dictionary",
this->m->file->getLastOffset(),
"file uses encryption SubFilters,"
" which qpdf does not support");
"file uses encryption SubFilters, which qpdf does not support");
}
if (!(encryption_dict.getKey("/V").isInteger() &&
@ -844,13 +834,10 @@ QPDF::initializeEncryption()
encryption_dict.getKey("/O").isString() &&
encryption_dict.getKey("/U").isString() &&
encryption_dict.getKey("/P").isInteger())) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"encryption dictionary",
this->m->file->getLastOffset(),
"some encryption dictionary parameters are missing "
"or the wrong type");
"some encryption dictionary parameters are missing or the wrong "
"type");
}
int V = encryption_dict.getKey("/V").getIntValueAsInt();
@ -886,25 +873,18 @@ QPDF::initializeEncryption()
pad_short_parameter(O, key_bytes);
pad_short_parameter(U, key_bytes);
if (!((O.length() == key_bytes) && (U.length() == key_bytes))) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"encryption dictionary",
this->m->file->getLastOffset(),
"incorrect length for /O and/or /U in "
"encryption dictionary");
"incorrect length for /O and/or /U in encryption dictionary");
}
} else {
if (!(encryption_dict.getKey("/OE").isString() &&
encryption_dict.getKey("/UE").isString() &&
encryption_dict.getKey("/Perms").isString())) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"encryption dictionary",
this->m->file->getLastOffset(),
"some V=5 encryption dictionary parameters are "
"missing or the wrong type");
"some V=5 encryption dictionary parameters are missing or the "
"wrong type");
}
OE = encryption_dict.getKey("/OE").getStringValue();
UE = encryption_dict.getKey("/UE").getStringValue();
@ -1062,12 +1042,10 @@ QPDF::initializeEncryption()
this->m->encp->encryption_key = recover_encryption_key_with_password(
this->m->encp->provided_password, data, perms_valid);
if (!perms_valid) {
warn(
qpdf_e_damaged_pdf,
warn(damagedPDF(
"encryption dictionary",
this->m->file->getLastOffset(),
"/Perms field in encryption dictionary"
" doesn't match expected value");
"/Perms field in encryption dictionary doesn't match expected "
"value"));
}
}
}
@ -1121,13 +1099,9 @@ QPDF::decryptString(std::string& str, QPDFObjGen const& og)
break;
default:
warn(
qpdf_e_damaged_pdf,
this->m->last_object_description,
this->m->file->getLastOffset(),
"unknown encryption filter for strings"
" (check /StrF in /Encrypt dictionary);"
" strings may be decrypted improperly");
warn(damagedPDF(
"unknown encryption filter for strings (check /StrF in "
"/Encrypt dictionary); strings may be decrypted improperly"));
// To avoid repeated warnings, reset cf_string. Assume
// we'd want to use AES if V == 4.
this->m->encp->cf_string = e_aes;
@ -1166,13 +1140,9 @@ QPDF::decryptString(std::string& str, QPDFObjGen const& og)
} catch (QPDFExc&) {
throw;
} catch (std::runtime_error& e) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
this->m->file->getLastOffset(),
throw damagedPDF(
"error decrypting string for object " + og.unparse() + ": " +
e.what());
e.what());
}
}
@ -1265,11 +1235,8 @@ QPDF::decryptStream(
file->getName(),
"",
file->getLastOffset(),
"unknown encryption filter for streams"
" (check " +
method_source +
");"
" streams may be decrypted improperly"));
"unknown encryption filter for streams (check " +
method_source + "); streams may be decrypted improperly"));
// To avoid repeated warnings, reset cf_stream. Assume
// we'd want to use AES if V == 4.
encp->cf_stream = e_aes;

55
libqpdf/QPDF_linearization.cc
View File

@ -186,24 +186,16 @@ QPDF::readLinearizationData()
if (!(H.isArray() && O.isInteger() && E.isInteger() && N.isInteger() &&
T.isInteger() && (P.isInteger() || P.isNull()))) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"linearization dictionary",
this->m->file->getLastOffset(),
"some keys in linearization dictionary are of "
"the wrong type");
"some keys in linearization dictionary are of the wrong type");
}
// Hint table array: offset length [ offset length ]
size_t n_H_items = toS(H.getArrayNItems());
if (!((n_H_items == 2) || (n_H_items == 4))) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"linearization dictionary",
this->m->file->getLastOffset(),
"H has the wrong number of items");
throw damagedPDF(
"linearization dictionary", "H has the wrong number of items");
}
std::vector<int> H_items;
@ -212,11 +204,8 @@ QPDF::readLinearizationData()
if (oh.isInteger()) {
H_items.push_back(oh.getIntValueAsInt());
} else {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"linearization dictionary",
this->m->file->getLastOffset(),
"some H items are of the wrong type");
}
}
@ -249,12 +238,8 @@ QPDF::readLinearizationData()
// initialized from N, to pre-allocate memory, so make sure it's
// accurate and bail right now if it's not.
if (N.getIntValue() != static_cast<long long>(getAllPages().size())) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"linearization hint table",
this->m->file->getLastOffset(),
"/N does not match number of pages");
throw damagedPDF(
"linearization hint table", "/N does not match number of pages");
}
// file_size initialized by isLinearized()
@ -297,11 +282,8 @@ QPDF::readLinearizationData()
int HSi = HS.getIntValueAsInt();
if ((HSi < 0) || (toS(HSi) >= h_size)) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"linearization hint table",
this->m->file->getLastOffset(),
"/S (shared object) offset is out of bounds");
}
readHSharedObject(BitStream(h_buf + HSi, h_size - toS(HSi)));
@ -309,11 +291,8 @@ QPDF::readLinearizationData()
if (HO.isInteger()) {
int HOi = HO.getIntValueAsInt();
if ((HOi < 0) || (toS(HOi) >= h_size)) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
throw damagedPDF(
"linearization hint table",
this->m->file->getLastOffset(),
"/O (outline) offset is out of bounds");
}
readHGeneric(
@ -331,12 +310,8 @@ QPDF::readHintStream(Pipeline& pl, qpdf_offset_t offset, size_t length)
qpdf_offset_t min_end_offset = oc.end_before_space;
qpdf_offset_t max_end_offset = oc.end_after_space;
if (!H.isStream()) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"linearization dictionary",
this->m->file->getLastOffset(),
"hint table is not a stream");
throw damagedPDF(
"linearization dictionary", "hint table is not a stream");
}
QPDFObjectHandle Hdict = H.getDict();
@ -362,12 +337,8 @@ QPDF::readHintStream(Pipeline& pl, qpdf_offset_t offset, size_t length)
*this->m->log->getError()
<< "expected = " << computed_end << "; actual = " << min_end_offset
<< ".." << max_end_offset << "\n";
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
"linearization dictionary",
this->m->file->getLastOffset(),
"hint table length mismatch");
throw damagedPDF(
"linearization dictionary", "hint table length mismatch");
}
H.pipeStreamData(&pl, 0, qpdf_dl_specialized);
return Hdict;

3
qpdf/test_char_sign.cc
View File

@ -1,5 +1,6 @@
#include <cstdio>
int main()
int
main()
{
char ch = '\xf7';
if (ch < 0) {