1 files changed, 201 insertions, 0 deletions
diff --git a/xpdf/UnicodeRemapping.cc b/xpdf/UnicodeRemapping.cc
new file mode 100644
index 0000000..72dbc0e
--- /dev/null
+++ b/xpdf/UnicodeRemapping.cc
@@ -0,0 +1,201 @@
+//========================================================================
+//
+// UnicodeRemapping.cc
+//
+// Copyright 2018 Glyph & Cog, LLC
+//
+//========================================================================
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma implementation
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include "gmem.h"
+#include "gmempp.h"
+#include "gfile.h"
+#include "GString.h"
+#include "Error.h"
+#include "UnicodeRemapping.h"
+
+//------------------------------------------------------------------------
+
+#define maxUnicodeString 8
+
+struct UnicodeRemappingString {
+  Unicode in;
+  Unicode out[maxUnicodeString];
+  int len;
+};
+
+//------------------------------------------------------------------------
+
+static int hexCharVals[256] = {
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 1x
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 2x
+   0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1, -1, -1, -1, -1, // 3x
+  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 4x
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 5x
+  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 6x
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 7x
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 8x
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 9x
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // Ax
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // Bx
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // Cx
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // Dx
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // Ex
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1  // Fx
+};
+
+// Parse a <len>-byte hex string <s> into *<val>.  Returns false on
+// error.
+static GBool parseHex(char *s, int len, Guint *val) {
+  int i, x;
+
+  *val = 0;
+  for (i = 0; i < len; ++i) {
+    x = hexCharVals[s[i] & 0xff];
+    if (x < 0) {
+      return gFalse;
+    }
+    *val = (*val << 4) + x;
+  }
+  return gTrue;
+}
+
+//------------------------------------------------------------------------
+
+UnicodeRemapping::UnicodeRemapping() {
+  for (int i = 0; i < 256; ++i) {
+    page0[i] = (Unicode)i;
+  }
+  sMap = NULL;
+  sMapLen = sMapSize = 0;
+}
+
+UnicodeRemapping::~UnicodeRemapping() {
+  gfree(sMap);
+}
+
+void UnicodeRemapping::addRemapping(Unicode in, Unicode *out, int len) {
+  int i, j;
+
+  if (in < 256 && len == 1) {
+    page0[in] = out[0];
+  } else {
+    if (in < 256) {
+      page0[in] = 0xffffffff;
+    }
+    if (sMapLen == sMapSize) {
+      sMapSize += 16;
+      sMap = (UnicodeRemappingString *)
+	         greallocn(sMap, sMapSize, sizeof(UnicodeRemappingString));
+    }
+    i = findSMap(in);
+    if (i < sMapLen) {
+      memmove(sMap + i + 1, sMap + i,
+	      (sMapLen - i) * sizeof(UnicodeRemappingString));
+    }
+    sMap[i].in = in;
+    for (j = 0; j < len && j < maxUnicodeString; ++j) {
+      sMap[i].out[j] = out[j];
+    }
+    sMap[i].len = j;
+    ++sMapLen;
+  }
+}
+
+void UnicodeRemapping::parseFile(GString *fileName) {
+  FILE *f;
+  char buf[256];
+  Unicode in;
+  Unicode out[maxUnicodeString];
+  char *tok;
+  int line, n;
+
+  if (!(f = openFile(fileName->getCString(), "r"))) {
+    error(errSyntaxError, -1, "Couldn't open unicodeRemapping file '{0:t}'",
+	  fileName);
+    return;
+  }
+
+  line = 0;
+  while (getLine(buf, sizeof(buf), f)) {
+    ++line;
+    if (!(tok = strtok(buf, " \t\r\n")) ||
+	!parseHex(tok, (int)strlen(tok), &in)) {
+      error(errSyntaxWarning, -1,
+	    "Bad line ({0:d}) in unicodeRemapping file '{1:t}'",
+	    line, fileName);
+      continue;
+    }
+    n = 0;
+    while (n < maxUnicodeString) {
+      if (!(tok = strtok(NULL, " \t\r\n"))) {
+	break;
+      }
+      if (!parseHex(tok, (int)strlen(tok), &out[n])) {
+	error(errSyntaxWarning, -1,
+	      "Bad line ({0:d}) in unicodeRemapping file '{1:t}'",
+	      line, fileName);
+	break;
+      }
+      ++n;
+    }
+    addRemapping(in, out, n);
+  }
+
+  fclose(f);
+}
+
+// Determine the location in sMap to insert/replace the entry for [u].
+int UnicodeRemapping::findSMap(Unicode u) {
+  int a, b, m;
+
+  a = -1;
+  b = sMapLen;
+  // invariant: sMap[a].in < u <= sMap[b].in
+  while (b - a > 1) {
+    m = (a + b) / 2;
+    if (sMap[m].in < u) {
+      a = m;
+    } else {
+      b = m;
+    }
+  }
+  return b;
+}
+
+int UnicodeRemapping::map(Unicode in, Unicode *out, int size) {
+  int a, b, m, i;
+
+  if (in < 256 && page0[in] != 0xffffffff) {
+    out[0] = page0[in];
+    return 1;
+  }
+
+  a = -1;
+  b = sMapLen;
+  // invariant: sMap[a].in < in < sMap[b].in
+  while (b - a > 1) {
+    m = (a + b) / 2;
+    if (sMap[m].in < in) {
+      a = m;
+    } else if (in < sMap[m].in) {
+      b = m;
+    } else {
+      for (i = 0; i < sMap[m].len && i < size; ++i) {
+	out[i] = sMap[m].out[i];
+      }
+      return i;
+    }
+  }
+
+  out[0] = in;
+  return 1;
+}