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QPPFObjGen : tidy QPDF::readObjectAtOffset

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Change method signature to use QPDFObjGen.
This commit is contained in:
m-holger 2022-07-23 13:47:18 +01:00
parent 6ea17d1f0e
commit c0168cf88c
3 changed files with 26 additions and 50 deletions
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6
include/qpdf/QPDF.hh
View File

@ -1146,10 +1146,8 @@ class QPDF
bool attempt_recovery,
qpdf_offset_t offset,
std::string const& description,
int exp_objid,
int exp_generation,
int& act_objid,
int& act_generation);
QPDFObjGen const& exp_og,
QPDFObjGen& og);
bool objectChanged(QPDFObjGen const& og, std::shared_ptr<QPDFObject>& oph);
std::shared_ptr<QPDFObject> resolve(int objid, int generation);
void resolveObjectsInStream(int obj_stream_number);

63
libqpdf/QPDF.cc
View File

@ -1055,12 +1055,11 @@ QPDF::read_xrefStream(qpdf_offset_t xref_offset)
{
bool found = false;
if (!this->m->ignore_xref_streams) {
int xobj;
int xgen;
QPDFObjGen x_og;
QPDFObjectHandle xref_obj;
try {
xref_obj = readObjectAtOffset(
false, xref_offset, "xref stream", 0, 0, xobj, xgen);
false, xref_offset, "xref stream", QPDFObjGen(), x_og);
} catch (QPDFExc&) {
// ignore -- report error below
}
@ -1776,13 +1775,11 @@ QPDF::readObjectAtOffset(
bool try_recovery,
qpdf_offset_t offset,
std::string const& description,
int exp_objid,
int exp_generation,
int& objid,
int& generation)
QPDFObjGen const& exp_og,
QPDFObjGen& og)
{
bool check_og = true;
if (exp_objid == 0) {
if (exp_og.getObj() == 0) {
// This method uses an expect object ID of 0 to indicate that
// we don't know or don't care what the actual object ID is at
// this offset. This is true when we read the xref stream and
@ -1794,7 +1791,7 @@ QPDF::readObjectAtOffset(
check_og = false;
try_recovery = false;
} else {
setLastObjectDescription(description, exp_objid, exp_generation);
setLastObjectDescription(description, exp_og.getObj(), exp_og.getGen());
}
if (!this->m->attempt_recovery) {
@ -1840,9 +1837,9 @@ QPDF::readObjectAtOffset(
offset,
"expected n n obj");
}
objid = QUtil::string_to_int(tobjid.getValue().c_str());
generation = QUtil::string_to_int(tgen.getValue().c_str());
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(
@ -1852,17 +1849,14 @@ QPDF::readObjectAtOffset(
offset,
"object with ID 0");
}
if (check_og &&
(!((objid == exp_objid) && (generation == exp_generation)))) {
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 ") +
QPDFObjGen(exp_objid, exp_generation).unparse(' ') + " obj"));
(std::string("expected ") + exp_og.unparse(' ') + " obj"));
if (try_recovery) {
// Will be retried below
throw e;
@ -1876,18 +1870,12 @@ QPDF::readObjectAtOffset(
if (try_recovery) {
// Try again after reconstructing xref table
reconstruct_xref(e);
QPDFObjGen og(exp_objid, exp_generation);
if (this->m->xref_table.count(og) &&
(this->m->xref_table[og].getType() == 1)) {
qpdf_offset_t new_offset = this->m->xref_table[og].getOffset();
if (this->m->xref_table.count(exp_og) &&
(this->m->xref_table[exp_og].getType() == 1)) {
qpdf_offset_t new_offset =
this->m->xref_table[exp_og].getOffset();
QPDFObjectHandle result = readObjectAtOffset(
false,
new_offset,
description,
exp_objid,
exp_generation,
objid,
generation);
false, new_offset, description, exp_og, og);
QTC::TC("qpdf", "QPDF recovered in readObjectAtOffset");
return result;
} else {
@ -1897,8 +1885,7 @@ QPDF::readObjectAtOffset(
"",
0,
std::string(
"object " +
QPDFObjGen(exp_objid, exp_generation).unparse(' ') +
"object " + exp_og.unparse(' ') +
" not found in file after regenerating"
" cross reference table"));
return QPDFObjectHandle::newNull();
@ -1909,7 +1896,7 @@ QPDF::readObjectAtOffset(
}
QPDFObjectHandle oh =
readObject(this->m->file, description, objid, generation, false);
readObject(this->m->file, description, og.getObj(), og.getGen(), false);
if (!(readToken(this->m->file) ==
QPDFTokenizer::Token(QPDFTokenizer::tt_word, "endobj"))) {
@ -1921,7 +1908,6 @@ QPDF::readObjectAtOffset(
"expected endobj");
}
QPDFObjGen og(objid, generation);
if (!this->m->obj_cache.count(og)) {
// Store the object in the cache here so it gets cached
// whether we first know the offset or whether we first know
@ -2014,16 +2000,9 @@ QPDF::resolve(int objid, int generation)
{
qpdf_offset_t offset = entry.getOffset();
// Object stored in cache by readObjectAtOffset
int aobjid;
int ageneration;
QPDFObjectHandle oh = readObjectAtOffset(
true,
offset,
"",
objid,
generation,
aobjid,
ageneration);
QPDFObjGen a_og;
QPDFObjectHandle oh =
readObjectAtOffset(true, offset, "", og, a_og);
}
break;

7
libqpdf/QPDF_linearization.cc
View File

@ -325,11 +325,10 @@ QPDF::readLinearizationData()
QPDFObjectHandle
QPDF::readHintStream(Pipeline& pl, qpdf_offset_t offset, size_t length)
{
int obj;
int gen;
QPDFObjGen og;
QPDFObjectHandle H = readObjectAtOffset(
false, offset, "linearization hint stream", 0, 0, obj, gen);
ObjCache& oc = this->m->obj_cache[QPDFObjGen(obj, gen)];
false, offset, "linearization hint stream", QPDFObjGen(), og);
ObjCache& oc = this->m->obj_cache[og];
qpdf_offset_t min_end_offset = oc.end_before_space;
qpdf_offset_t max_end_offset = oc.end_after_space;
if (!H.isStream()) {