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Use std::string_view in QdfFixer::processLines

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Change type of local var lines to string_view. Also, instead of
constructing a list of lines, read the entire input into a single string
and break it up into lines on the fly.stash
This commit is contained in:
m-holger 2023-03-06 17:31:19 +00:00
parent 4ee6ff0a73
commit 011b1d7e3a
1 changed files with 57 additions and 30 deletions
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87
qpdf/fix-qdf.cc
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@ -6,6 +6,7 @@
#include <cstring>
#include <iostream>
#include <regex>
#include <string_view>
static char const* whoami = 0;
@ -20,7 +21,7 @@ class QdfFixer
{
public:
QdfFixer(std::string const& filename);
void processLines(std::list<std::string>& lines);
void processLines(std::string const& input);
private:
void fatal(std::string const&);
@ -58,9 +59,9 @@ class QdfFixer
size_t xref_f1_nbytes;
size_t xref_f2_nbytes;
size_t xref_size;
std::vector<std::string> ostream;
std::vector<std::string_view> ostream;
std::vector<qpdf_offset_t> ostream_offsets;
std::vector<std::string> ostream_discarded;
std::vector<std::string_view> ostream_discarded;
size_t ostream_idx;
int ostream_id;
std::string ostream_extends;
@ -92,34 +93,60 @@ QdfFixer::fatal(std::string const& msg)
}
void
QdfFixer::processLines(std::list<std::string>& lines)
QdfFixer::processLines(std::string const& input)
{
static std::regex re_n_0_obj("^(\\d+) 0 obj\n$");
static std::regex re_xref("^xref\n$");
static std::regex re_stream("^stream\n$");
static std::regex re_endobj("^endobj\n$");
static std::regex re_type_objstm("/Type /ObjStm");
static std::regex re_type_xref("/Type /XRef");
static std::regex re_extends("/Extends (\\d+ 0 R)");
static std::regex re_ostream_obj("^%% Object stream: object (\\d+)");
static std::regex re_endstream("^endstream\n$");
static std::regex re_length_or_w("/(Length|W) ");
static std::regex re_size("/Size ");
static std::regex re_ignore_newline("^%QDF: ignore_newline\n$");
static std::regex re_num("^\\d+\n$");
static std::regex re_trailer("^trailer <<");
static std::regex re_size_n("^ /Size \\d+\n$");
static std::regex re_dict_end("^>>\n$");
static const std::regex re_n_0_obj("^(\\d+) 0 obj\n$");
static const std::regex re_xref("^xref\n$");
static const std::regex re_stream("^stream\n$");
static const std::regex re_endobj("^endobj\n$");
static const std::regex re_type_objstm("/Type /ObjStm");
static const std::regex re_type_xref("/Type /XRef");
static const std::regex re_extends("/Extends (\\d+ 0 R)");
static const std::regex re_ostream_obj("^%% Object stream: object (\\d+)");
static const std::regex re_endstream("^endstream\n$");
static const std::regex re_length_or_w("/(Length|W) ");
static const std::regex re_size("/Size ");
static const std::regex re_ignore_newline("^%QDF: ignore_newline\n$");
static const std::regex re_num("^\\d+\n$");
static const std::regex re_trailer("^trailer <<");
static const std::regex re_size_n("^ /Size \\d+\n$");
static const std::regex re_dict_end("^>>\n$");
auto sv_diff = [](size_t i) {
return static_cast<std::string_view::difference_type>(i);
};
lineno = 0;
for (auto const& line: lines) {
bool more = true;
auto len_line = sv_diff(0);
std::string_view line;
std::string_view input_view{input.data(), input.size()};
size_t offs = 0;
auto b_line = input.cbegin();
std::smatch m;
auto const matches = [&m, &b_line, &len_line](std::regex const& r) {
return std::regex_search(b_line, b_line + len_line, m, r);
};
while (more) {
++lineno;
last_offset = offset;
offset += QIntC::to_offset(line.length());
std::smatch m;
auto matches = [&m, &line](std::regex& r) {
return std::regex_search(line, m, r);
};
b_line += len_line;
offs = input_view.find('\n');
if (offs == std::string::npos) {
more = false;
line = input_view;
} else {
offs++;
line = input_view.substr(0, offs);
input_view.remove_prefix(offs);
}
len_line = sv_diff(line.size());
offset += len_line;
if (state == st_top) {
if (matches(re_n_0_obj)) {
checkObjId(m[1].str());
@ -392,17 +419,17 @@ realmain(int argc, char* argv[])
} else if (argc == 2) {
filename = argv[1];
}
std::list<std::string> lines;
std::string input;
if (filename == 0) {
filename = "standard input";
QUtil::binary_stdin();
lines = QUtil::read_lines_from_file(stdin, true);
input = QUtil::read_file_into_string(stdin);
} else {
lines = QUtil::read_lines_from_file(filename, true);
input = QUtil::read_file_into_string(filename);
}
QUtil::binary_stdout();
QdfFixer qf(filename);
qf.processLines(lines);
qf.processLines(input);
return 0;
}