Refactor: pull *InputSource out of QPDF

InputSource, FileInputSource, and BufferInputSource are now top-level
classes instead of privately nested inside QPDF.

1 files changed, 41 insertions, 0 deletions

diff --git a/libqpdf/InputSource.cc b/libqpdf/InputSource.cc
new file mode 100644
index 00000000..79c889bf
--- /dev/null
+++ b/libqpdf/InputSource.cc
@@ -0,0 +1,41 @@
+#include <qpdf/InputSource.hh>
+#include <string.h>
+#include <qpdf/PointerHolder.hh>
+
+void
+InputSource::setLastOffset(qpdf_offset_t offset)
+{
+    this->last_offset = offset;
+}
+
+qpdf_offset_t
+InputSource::getLastOffset() const
+{
+    return this->last_offset;
+}
+
+std::string
+InputSource::readLine(size_t max_line_length)
+{
+    // Return at most max_line_length characters from the next line.
+    // Lines are terminated by one or more \r or \n characters.
+    // Consume the trailing newline characters but don't return them.
+    // After this is called, the file will be positioned after a line
+    // terminator or at the end of the file, and last_offset will
+    // point to position the file had when this method was called.
+
+    qpdf_offset_t offset = this->tell();
+    char* buf = new char[max_line_length + 1];
+    PointerHolder<char> bp(true, buf);
+    memset(buf, '\0', max_line_length + 1);
+    this->read(buf, max_line_length);
+    this->seek(offset, SEEK_SET);
+    qpdf_offset_t eol = this->findAndSkipNextEOL();
+    this->last_offset = offset;
+    size_t line_length = eol - offset;
+    if (line_length < max_line_length)
+    {
+        buf[line_length] = '\0';
+    }
+    return std::string(buf);
+}