1 files changed, 108 insertions, 0 deletions
diff --git a/libqpdf/Pl_ASCIIHexDecoder.cc b/libqpdf/Pl_ASCIIHexDecoder.cc
new file mode 100644
index 00000000..d1b4ef1c
--- /dev/null
+++ b/libqpdf/Pl_ASCIIHexDecoder.cc
@@ -0,0 +1,108 @@
+#include <qpdf/Pl_ASCIIHexDecoder.hh>
+#include <qpdf/QEXC.hh>
+#include <qpdf/QTC.hh>
+#include <string.h>
+#include <ctype.h>
+
+Pl_ASCIIHexDecoder::Pl_ASCIIHexDecoder(char const* identifier, Pipeline* next) :
+    Pipeline(identifier, next),
+    pos(0),
+    eod(false)
+{
+    strcpy(this->inbuf, "00");
+}
+
+Pl_ASCIIHexDecoder::~Pl_ASCIIHexDecoder()
+{
+}
+
+void
+Pl_ASCIIHexDecoder::write(unsigned char* buf, int len)
+{
+    if (this->eod)
+    {
+	return;
+    }
+    for (int i = 0; i < len; ++i)
+    {
+	char ch = toupper(buf[i]);
+	switch (ch)
+	{
+	  case ' ':
+	  case '\f':
+	  case '\v':
+	  case '\t':
+	  case '\r':
+	  case '\n':
+	    QTC::TC("libtests", "Pl_ASCIIHexDecoder ignore space");
+	    // ignore whitespace
+	    break;
+
+	  case '>':
+	    this->eod = true;
+	    flush();
+	    break;
+
+	  default:
+	    if (((ch >= '0') && (ch <= '9')) ||
+		((ch >= 'A') && (ch <= 'F')))
+	    {
+		this->inbuf[this->pos++] = ch;
+		if (this->pos == 2)
+		{
+		    flush();
+		}
+	    }
+	    else
+	    {
+		char t[2];
+		t[0] = ch;
+		t[1] = 0;
+		throw QEXC::General(
+		    std::string("character out of range during base Hex decode: ") + t);
+	    }
+	    break;
+	}
+	if (this->eod)
+	{
+	    break;
+	}
+    }
+}
+
+void
+Pl_ASCIIHexDecoder::flush()
+{
+    if (this->pos == 0)
+    {
+	QTC::TC("libtests", "Pl_ASCIIHexDecoder no-op flush");
+	return;
+    }
+    int b[2];
+    for (int i = 0; i < 2; ++i)
+    {
+	if (this->inbuf[i] >= 'A')
+	{
+	    b[i] = this->inbuf[i] - 'A' + 10;
+	}
+	else
+	{
+	    b[i] = this->inbuf[i] - '0';
+	}
+    }
+    unsigned char ch = (unsigned char)((b[0] << 4) + b[1]);
+
+    QTC::TC("libtests", "Pl_ASCIIHexDecoder partial flush",
+	    (this->pos == 2) ? 0 : 1);
+    getNext()->write(&ch, 1);
+
+    this->pos = 0;
+    strcpy(this->inbuf, "00");
+}
+
+void
+Pl_ASCIIHexDecoder::finish()
+{
+    flush();
+    getNext()->finish();
+}