Add PDF writer.

src/publishing/pdf/PdfXRefTable.cpp

@@ -0,0 +1,68 @@
+#include "PdfXRefTable.h"
+
+#include "StringUtils.h"
+
+PdfXRefTable::PdfXRefTable()
+{
+    mSections.push_back(TableSubSection());
+}
+
+std::string PdfXRefTable::ToString()
+{
+    std::string content;
+    for (const auto& section : mSections)
+    {
+        content += "xref\n" + std::to_string(section.mStartIndex) + " " + std::to_string(section.mRecords.size());
+        content += "\n";
+        for (const auto& record : section.mRecords)
+        {
+            auto offsetString = StringUtils::ToPaddedString(10, record.mOffsetBytes);
+            auto generationString = StringUtils::ToPaddedString(5, record.mGenerationNumber);
+            auto freeString = record.mIsFree ? "f" : "n";
+
+            content += offsetString + " " + generationString + " " + freeString + "\n";
+        }
+        content += "\n";
+    }
+    return content;
+}
+
+unsigned PdfXRefTable::GetNextOffset()
+{
+    auto lastNumRecords = mSections[mSections.size() - 1].mRecords.size();
+    if (lastNumRecords > 0)
+    {
+        return mSections[mSections.size() - 1].mRecords[lastNumRecords -1].mOffsetBytes + mLastAddedBytes;
+    }
+    else if (mSections.size() > 1)
+    {
+        lastNumRecords = mSections[mSections.size() - 2].mRecords.size();
+        return mSections[mSections.size() - 2].mRecords[lastNumRecords -1].mOffsetBytes + mLastAddedBytes;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+void PdfXRefTable::AddRecord(unsigned numBytes, unsigned generation, unsigned isFree)
+{
+    XRefRecord record;
+
+    record.mOffsetBytes = GetNextOffset();
+    record.mGenerationNumber = generation;
+    record.mIsFree = isFree;
+    mSections[mSections.size()-1].mRecords.push_back(record);
+    mLastAddedBytes = numBytes;
+}
+
+unsigned PdfXRefTable::GetNumEntries()
+{
+    unsigned count = 0;
+    for (const auto& section : mSections)
+    {
+        count += section.mRecords.size();
+    }
+    return count;
+}
+