pdf/engine/fuzz/fuzz_load.cpp

#include "pdfengine/hardened_limits.h"
#include "pdfengine/pdf_document.hpp"

#include <cstddef>
#include <cstdint>
#include <vector>

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
    using namespace pdfengine;

    if (!limits::documentSizeOk(size)) return 0;

    std::vector<uint8_t> bytes(data, data + size);
    auto doc = PdfDocument::loadFromMemory(bytes, "");
    if (!doc) return 0;
    PdfDocument& d = **doc;

    const int pages = d.pageCount();
    if (!limits::pageCountOk(pages)) return 0;

    (void)d.metadata();
    (void)d.extractOutline();

    const int limit = pages < 3 ? pages : 3;
    for (int i = 0; i < limit; ++i) {
        auto page = d.getPage(i);
        if (!page) continue;
        PdfPage& p = **page;

        (void)p.render(72);
        (void)p.extractText();
        (void)p.extractAnnotations();

        auto glyphs = p.orderedGlyphs();
        if (glyphs && !glyphs->empty()) {
            const auto& g = glyphs->front();
            (void)p.hitGlyph(g.x, g.y);
            (void)p.selectRange(g.x, g.y, g.x + 50.0, g.y + 20.0);
        }
    }
    return 0;
}