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// NOTE: This test program doesn't do anything special to enable large
// file support. This is important since it verifies that programs
// don't have to do anything special -- all the work is done
// internally by the library as long as they don't do their own file
// I/O.
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFWriter.hh>
#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/QUtil.hh>
#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
// Run "test_large_file write small a.pdf" to get a PDF file that you
// can look at in a reader.
// This program reads and writes specially crafted files for testing
// large file support. In write mode, write a file of npages pages
// where each page contains unique text and a unique image. The image
// is a binary representation of the page number. The image contains
// horizontal stripes with light stripes representing 1, dark stripes
// representing 0, and the high bit on top. In read mode, read the
// file back checking to make sure all the image data and page
// contents are as expected.
// Running this is small mode produces a small file that is easy to
// look at in any viewer. Since there is no question about proper
// functionality for small files, writing and reading the small file
// allows the qpdf library to test this test program. Writing and
// reading the large file then allows us to verify large file support
// with confidence.
static char const* whoami = 0;
// Height should be a multiple of 10
static int const nstripes = 10;
static int const stripesize_large = 500;
static int const stripesize_small = 5;
static int const npages = 200;
// initialized in main
int stripesize = 0;
int width = 0;
int height = 0;
static unsigned char* buf = 0;
static inline unsigned char get_pixel_color(int n, size_t row)
{
return (n & (1 << (nstripes - 1 - row))) ? '\xc0' : '\x40';
}
class ImageChecker: public Pipeline
{
public:
ImageChecker(int n);
virtual ~ImageChecker();
virtual void write(unsigned char* data, size_t len);
virtual void finish();
private:
int n;
size_t offset;
bool okay;
};
ImageChecker::ImageChecker(int n) :
Pipeline("image checker", 0),
n(n),
offset(0),
okay(true)
{
}
ImageChecker::~ImageChecker()
{
}
void
ImageChecker::write(unsigned char* data, size_t len)
{
for (size_t i = 0; i < len; ++i)
{
size_t y = (this->offset + i) / width / stripesize;
unsigned char color = get_pixel_color(n, y);
if (data[i] != color)
{
okay = false;
}
}
this->offset += len;
}
void
ImageChecker::finish()
{
if (! okay)
{
std::cout << "errors found checking image data for page " << n
<< std::endl;
}
}
class ImageProvider: public QPDFObjectHandle::StreamDataProvider
{
public:
ImageProvider(int n);
virtual ~ImageProvider();
virtual void provideStreamData(int objid, int generation,
Pipeline* pipeline);
private:
int n;
};
ImageProvider::ImageProvider(int n) :
n(n)
{
}
ImageProvider::~ImageProvider()
{
}
void
ImageProvider::provideStreamData(int objid, int generation,
Pipeline* pipeline)
{
if (buf == 0)
{
buf = new unsigned char[width * stripesize];
}
std::cout << "page " << n << " of " << npages << std::endl;
for (int y = 0; y < nstripes; ++y)
{
unsigned char color = get_pixel_color(n, y);
memset(buf, (int) color, width * stripesize);
pipeline->write(buf, width * stripesize);
}
pipeline->finish();
}
void usage()
{
std::cerr << "Usage: " << whoami << " {read|write} {large|small} outfile"
<< std::endl;
exit(2);
}
static void set_parameters(bool large)
{
stripesize = large ? stripesize_large : stripesize_small;
height = nstripes * stripesize;
width = height;
}
std::string generate_page_contents(int pageno)
{
std::string contents =
"BT /F1 24 Tf 72 720 Td (page " + QUtil::int_to_string(pageno) +
") Tj ET\n"
"q 468 0 0 468 72 72 cm /Im1 Do Q\n";
return contents;
}
static QPDFObjectHandle create_page_contents(QPDF& pdf, int pageno)
{
return QPDFObjectHandle::newStream(&pdf, generate_page_contents(pageno));
}
QPDFObjectHandle newName(std::string const& name)
{
return QPDFObjectHandle::newName(name);
}
QPDFObjectHandle newInteger(int val)
{
return QPDFObjectHandle::newInteger(val);
}
static void create_pdf(char const* filename)
{
QPDF pdf;
pdf.emptyPDF();
QPDFObjectHandle font = pdf.makeIndirectObject(
QPDFObjectHandle::newDictionary());
font.replaceKey("/Type", newName("/Font"));
font.replaceKey("/Subtype", newName("/Type1"));
font.replaceKey("/Name", newName("/F1"));
font.replaceKey("/BaseFont", newName("/Helvetica"));
font.replaceKey("/Encoding", newName("/WinAnsiEncoding"));
QPDFObjectHandle procset =
pdf.makeIndirectObject(QPDFObjectHandle::newArray());
procset.appendItem(newName("/PDF"));
procset.appendItem(newName("/Text"));
procset.appendItem(newName("/ImageC"));
QPDFObjectHandle rfont = QPDFObjectHandle::newDictionary();
rfont.replaceKey("/F1", font);
QPDFObjectHandle mediabox = QPDFObjectHandle::newArray();
mediabox.appendItem(newInteger(0));
mediabox.appendItem(newInteger(0));
mediabox.appendItem(newInteger(612));
mediabox.appendItem(newInteger(792));
for (int pageno = 1; pageno <= npages; ++pageno)
{
QPDFObjectHandle image = QPDFObjectHandle::newStream(&pdf);
QPDFObjectHandle image_dict = image.getDict();
image_dict.replaceKey("/Type", newName("/XObject"));
image_dict.replaceKey("/Subtype", newName("/Image"));
image_dict.replaceKey("/ColorSpace", newName("/DeviceGray"));
image_dict.replaceKey("/BitsPerComponent", newInteger(8));
image_dict.replaceKey("/Width", newInteger(width));
image_dict.replaceKey("/Height", newInteger(height));
ImageProvider* p = new ImageProvider(pageno);
PointerHolder<QPDFObjectHandle::StreamDataProvider> provider(p);
image.replaceStreamData(provider,
QPDFObjectHandle::newNull(),
QPDFObjectHandle::newNull());
QPDFObjectHandle xobject = QPDFObjectHandle::newDictionary();
xobject.replaceKey("/Im1", image);
QPDFObjectHandle resources = QPDFObjectHandle::newDictionary();
resources.replaceKey("/ProcSet", procset);
resources.replaceKey("/Font", rfont);
resources.replaceKey("/XObject", xobject);
QPDFObjectHandle contents = create_page_contents(pdf, pageno);
QPDFObjectHandle page = pdf.makeIndirectObject(
QPDFObjectHandle::newDictionary());
page.replaceKey("/Type", newName("/Page"));
page.replaceKey("/MediaBox", mediabox);
page.replaceKey("/Contents", contents);
page.replaceKey("/Resources", resources);
pdf.addPage(page, false);
}
QPDFWriter w(pdf, filename);
w.setStaticID(true); // for testing only
w.setStreamDataMode(qpdf_s_preserve);
w.setObjectStreamMode(qpdf_o_disable);
w.write();
}
static void check_page_contents(int pageno, QPDFObjectHandle page)
{
PointerHolder<Buffer> buf =
page.getKey("/Contents").getStreamData();
std::string actual_contents =
std::string((char *)(buf->getBuffer()), buf->getSize());
std::string expected_contents = generate_page_contents(pageno);
if (expected_contents != actual_contents)
{
std::cout << "page contents wrong for page " << pageno << std::endl
<< "ACTUAL: " << actual_contents
<< "EXPECTED: " << expected_contents
<< "----\n";
}
}
static void check_image(int pageno, QPDFObjectHandle page)
{
QPDFObjectHandle image =
page.getKey("/Resources").getKey("/XObject").getKey("/Im1");
ImageChecker ic(pageno);
image.pipeStreamData(&ic, true, false, false);
}
static void check_pdf(char const* filename)
{
QPDF pdf;
pdf.processFile(filename);
std::vector<QPDFObjectHandle> const& pages = pdf.getAllPages();
assert(pages.size() == (size_t)npages);
for (int i = 0; i < npages; ++i)
{
int pageno = i + 1;
std::cout << "page " << pageno << " of " << npages << std::endl;
check_page_contents(pageno, pages[i]);
check_image(pageno, pages[i]);
}
}
int main(int argc, char* argv[])
{
whoami = QUtil::getWhoami(argv[0]);
QUtil::setLineBuf(stdout);
// For libtool's sake....
if (strncmp(whoami, "lt-", 3) == 0)
{
whoami += 3;
}
if (argc != 4)
{
usage();
}
char const* operation = argv[1];
char const* size = argv[2];
char const* filename = argv[3];
bool op_write = false;
bool size_large = false;
if (strcmp(operation, "write") == 0)
{
op_write = true;
}
else if (strcmp(operation, "read") == 0)
{
op_write = false;
}
else
{
usage();
}
if (strcmp(size, "large") == 0)
{
size_large = true;
}
else if (strcmp(size, "small") == 0)
{
size_large = false;
}
else
{
usage();
}
set_parameters(size_large);
try
{
if (op_write)
{
create_pdf(filename);
}
else
{
check_pdf(filename);
}
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
exit(2);
}
delete [] buf;
return 0;
}
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