Find PDF header anywhere in the first 1024 bytes

1 files changed, 61 insertions, 0 deletions

diff --git a/libqpdf/OffsetInputSource.cc b/libqpdf/OffsetInputSource.cc
new file mode 100644
index 00000000..c1ec4102
--- /dev/null
+++ b/libqpdf/OffsetInputSource.cc
@@ -0,0 +1,61 @@
+#include <qpdf/OffsetInputSource.hh>
+
+OffsetInputSource::OffsetInputSource(PointerHolder<InputSource> proxied,
+                                     qpdf_offset_t global_offset) :
+    proxied(proxied),
+    global_offset(global_offset)
+{
+}
+
+OffsetInputSource::~OffsetInputSource()
+{
+}
+
+qpdf_offset_t
+OffsetInputSource::findAndSkipNextEOL()
+{
+    return this->proxied->findAndSkipNextEOL() - this->global_offset;
+}
+
+std::string const&
+OffsetInputSource::getName() const
+{
+    return this->proxied->getName();
+}
+
+qpdf_offset_t
+OffsetInputSource::tell()
+{
+    return this->proxied->tell() - this->global_offset;
+}
+
+void
+OffsetInputSource::seek(qpdf_offset_t offset, int whence)
+{
+    if (whence == SEEK_SET)
+    {
+        this->proxied->seek(offset + global_offset, whence);
+    }
+    else
+    {
+        this->proxied->seek(offset, whence);
+    }
+}
+
+void
+OffsetInputSource::rewind()
+{
+    seek(0, SEEK_SET);
+}
+
+size_t
+OffsetInputSource::read(char* buffer, size_t length)
+{
+    return this->proxied->read(buffer, length);
+}
+
+void
+OffsetInputSource::unreadCh(char ch)
+{
+    this->proxied->unreadCh(ch);
+}