1 files changed, 164 insertions, 0 deletions
diff --git a/xpdf/TextString.cc b/xpdf/TextString.cc
new file mode 100644
index 0000000..5bc9de2
--- /dev/null
+++ b/xpdf/TextString.cc
@@ -0,0 +1,164 @@
+//========================================================================
+//
+// TextString.cc
+//
+// Copyright 2011-2013 Glyph & Cog, LLC
+//
+//========================================================================
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma implementation
+#endif
+
+#include <string.h>
+#include "gmem.h"
+#include "GString.h"
+#include "PDFDocEncoding.h"
+#include "TextString.h"
+
+//------------------------------------------------------------------------
+
+TextString::TextString() {
+  u = NULL;
+  len = size = 0;
+}
+
+TextString::TextString(GString *s) {
+  u = NULL;
+  len = size = 0;
+  append(s);
+}
+
+TextString::TextString(TextString *s) {
+  len = size = s->len;
+  if (len) {
+    u = (Unicode *)gmallocn(size, sizeof(Unicode));
+    memcpy(u, s->u, len * sizeof(Unicode));
+  } else {
+    u = NULL;
+  }
+}
+
+TextString::~TextString() {
+  gfree(u);
+}
+
+TextString *TextString::append(Unicode c) {
+  expand(1);
+  u[len] = c;
+  ++len;
+  return this;
+}
+
+TextString *TextString::append(GString *s) {
+  int n, i;
+
+  if ((s->getChar(0) & 0xff) == 0xfe &&
+      (s->getChar(1) & 0xff) == 0xff) {
+    n = (s->getLength() - 2) / 2;
+    expand(n);
+    for (i = 0; i < n; ++i) {
+      u[len + i] = ((s->getChar(2 + 2*i) & 0xff) << 8) |
+	           (s->getChar(3 + 2*i) & 0xff);
+    }
+    len += n;
+  } else {
+    n = s->getLength();
+    expand(n);
+    for (i = 0; i < n; ++i) {
+      u[len + i] = pdfDocEncoding[s->getChar(i) & 0xff];
+    }
+    len += n;
+  }
+  return this;
+}
+
+TextString *TextString::insert(int idx, Unicode c) {
+  if (idx >= 0 && idx <= len) {
+    expand(1);
+    if (idx < len) {
+      memmove(u + idx + 1, u + idx, (len - idx) * sizeof(Unicode));
+    }
+    u[idx] = c;
+    ++len;
+  }
+  return this;
+}
+
+TextString *TextString::insert(int idx, GString *s) {
+  int n, i;
+
+  if (idx >= 0 && idx <= len) {
+    if ((s->getChar(0) & 0xff) == 0xfe &&
+	(s->getChar(1) & 0xff) == 0xff) {
+      n = (s->getLength() - 2) / 2;
+      expand(n);
+      if (idx < len) {
+	memmove(u + idx + n, u + idx, (len - idx) * sizeof(Unicode));
+      }
+      for (i = 0; i < n; ++i) {
+	u[idx + i] = ((s->getChar(2 + 2*i) & 0xff) << 8) |
+	  (s->getChar(3 + 2*i) & 0xff);
+      }
+      len += n;
+    } else {
+      n = s->getLength();
+      expand(n);
+      if (idx < len) {
+	memmove(u + idx + n, u + idx, (len - idx) * sizeof(Unicode));
+      }
+      for (i = 0; i < n; ++i) {
+	u[idx + i] = pdfDocEncoding[s->getChar(i) & 0xff];
+      }
+      len += n;
+    }
+  }
+  return this;
+}
+
+void TextString::expand(int delta) {
+  int newLen;
+
+  newLen = len + delta;
+  if (delta > INT_MAX - len) {
+    // trigger an out-of-memory error
+    size = -1;
+  } else if (newLen <= size) {
+    return;
+  } else if (size > 0 && size <= INT_MAX / 2 && size*2 >= newLen) {
+    size *= 2;
+  } else {
+    size = newLen;
+  }
+  u = (Unicode *)greallocn(u, size, sizeof(Unicode));
+}
+
+GString *TextString::toPDFTextString() {
+  GString *s;
+  GBool useUnicode;
+  int i;
+
+  useUnicode = gFalse;
+  for (i = 0; i < len; ++i) {
+    if (u[i] >= 0x80) {
+      useUnicode = gTrue;
+      break;
+    }
+  }
+  s = new GString();
+  if (useUnicode) {
+    s->append((char)0xfe);
+    s->append((char)0xff);
+    for (i = 0; i < len; ++i) {
+      s->append((char)(u[i] >> 8));
+      s->append((char)u[i]);
+    }
+  } else {
+    for (i = 0; i < len; ++i) {
+      s->append((char)u[i]);
+    }
+  }
+  return s;
+}