Attachment 66223 Details for Bug 53925 – move text to unicode conversion to a separate function

[patch] move text to unicode conversion to a separate function

0003-Move-text-to-unicode-conversion-into-a-separate-func.patch (text/plain), 6.24 KB, created by Adrian Johnson on 2012-08-28 13:10:01 UTC

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Creator: Adrian Johnson

Created: 2012-08-28 13:10:01 UTC

Size: 6.24 KB

patch

obsolete

>From 25f34fdf16c1c6b99ed484ec8e45bb0c467517e2 Mon Sep 17 00:00:00 2001
>From: Adrian Johnson <ajohnson@redneon.com>
>Date: Tue, 28 Aug 2012 22:16:34 +0930
>Subject: [PATCH 3/3] Move text to unicode conversion into a separate function
>
>This also ensures UTF-16 ActualText strings are converted to UCS-4
>before calling addChar.
>---
> goo/GooString.cc         |    2 +-
> poppler/TextOutputDev.cc |   32 ++++----------------------------
> poppler/UTF.cc           |   34 ++++++++++++++++++++++++++++++++++
> poppler/UTF.h            |    8 ++++++++
> utils/pdfinfo.cc         |   37 ++++++-------------------------------
> 5 files changed, 53 insertions(+), 60 deletions(-)
>
>diff --git a/goo/GooString.cc b/goo/GooString.cc
>index 1ebf341..61dee33 100644
>--- a/goo/GooString.cc
>+++ b/goo/GooString.cc
>@@ -895,7 +895,7 @@ int GooString::cmpN(const char *sA, int n) const {
> 
> GBool GooString::hasUnicodeMarker(void)
> {
>-    return (s[0] & 0xff) == 0xfe && (s[1] & 0xff) == 0xff;
>+  return length > 1 && (s[0] & 0xff) == 0xfe && (s[1] & 0xff) == 0xff;
> }
> 
> GooString *GooString::sanitizedName(GBool psmode)
>diff --git a/poppler/TextOutputDev.cc b/poppler/TextOutputDev.cc
>index 7db041e..cc18c9b 100644
>--- a/poppler/TextOutputDev.cc
>+++ b/poppler/TextOutputDev.cc
>@@ -63,7 +63,7 @@
> #include "TextOutputDev.h"
> #include "Page.h"
> #include "Annot.h"
>-#include "PDFDocEncoding.h"
>+#include "UTF.h"
> 
> #ifdef MACOS
> // needed for setting type/creator of MacOS files
>@@ -5230,41 +5230,17 @@ void ActualText::end(GfxState *state) {
>   // extents of all the glyphs inside the span
> 
>   if (actualTextNBytes) {
>-    char *uniString = NULL;
>     Unicode *uni;
>-    int length, i;
>-
>-    if (!actualText->hasUnicodeMarker()) {
>-      if (actualText->getLength() > 0) {
>-        //non-unicode string -- assume pdfDocEncoding and
>-        //try to convert to UTF16BE
>-        uniString = pdfDocEncodingToUTF16(actualText, &length);
>-      } else {
>-        length = 0;
>-      }
>-    } else {
>-      uniString = actualText->getCString();
>-      length = actualText->getLength();
>-    }
>-
>-    if (length < 3)
>-      length = 0;
>-    else
>-      length = length/2 - 1;
>-    uni = new Unicode[length];
>-    for (i = 0 ; i < length; i++)
>-      uni[i] = ((uniString[2 + i*2] & 0xff)<<8)|(uniString[3 + i*2] & 0xff);
>+    int length;
> 
>     // now that we have the position info for all of the text inside
>     // the marked content span, we feed the "ActualText" back through
>     // text->addChar()
>+    length = TextStringToUCS4(actualText, &uni);
>     text->addChar(state, actualTextX0, actualTextY0,
>                   actualTextX1 - actualTextX0, actualTextY1 - actualTextY0,
>                   0, actualTextNBytes, uni, length);
>-
>-    delete [] uni;
>-    if (!actualText->hasUnicodeMarker())
>-      delete [] uniString;
>+    gfree(uni);
>   }
> 
>   delete actualText;
>diff --git a/poppler/UTF.cc b/poppler/UTF.cc
>index b5f7d9f..0642d04 100644
>--- a/poppler/UTF.cc
>+++ b/poppler/UTF.cc
>@@ -1,4 +1,5 @@
> #include "goo/gmem.h"
>+#include "PDFDocEncoding.h"
> #include "UTF.h"
> 
> int UTF16toUCS4(const Unicode *utf16, int utf16Len, Unicode **ucs4)
>@@ -45,3 +46,36 @@ int UTF16toUCS4(const Unicode *utf16, int utf16Len, Unicode **ucs4)
>   return len;
> }
> 
>+int TextStringToUCS4(GooString *textStr, Unicode **ucs4)
>+{
>+  int i, len;
>+  const char *s;
>+  Unicode *u;
>+
>+  len = textStr->getLength();
>+  s = textStr->getCString();
>+  if (len == 0)
>+    return 0;
>+
>+  if (textStr->hasUnicodeMarker()) {
>+    Unicode *utf16;
>+    len = len/2 - 1;
>+    if (len > 0) {
>+      utf16 = new Unicode[len];
>+      for (i = 0 ; i < len; i++) {
>+        utf16[i] = (s[2 + i*2] & 0xff) << 8 | (s[3 + i*2] & 0xff);
>+      }
>+      len = UTF16toUCS4(utf16, len, &u);
>+      delete utf16;
>+    } else {
>+      u = NULL;
>+    }
>+  } else {
>+    u = (Unicode*)gmallocn(len, sizeof(Unicode));
>+    for (i = 0 ; i < len; i++) {
>+      u[i] = pdfDocEncoding[s[i]];
>+    }
>+  }
>+  *ucs4 = u;
>+  return len;
>+}
>diff --git a/poppler/UTF.h b/poppler/UTF.h
>index d0ef5bc..ec51e5a 100644
>--- a/poppler/UTF.h
>+++ b/poppler/UTF.h
>@@ -27,6 +27,7 @@
> #pragma implementation
> #endif
> 
>+#include "goo/GooString.h"
> #include "CharTypes.h"
> 
> // Convert a UTF-16 string to a UCS-4
>@@ -36,6 +37,13 @@
> //   returns number of UCS-4 characters
> int UTF16toUCS4(const Unicode *utf16, int utf16_len, Unicode **ucs4_out);
> 
>+// Convert a PDF Text String to UCS-4
>+//   s          - PDF text string
>+//   ucs4       - if the number of UCS-4 characters is > 0, allocates and
>+//                returns UCS-4 string. Free with gfree.
>+//   returns number of UCS-4 characters
>+int TextStringToUCS4(GooString *textStr, Unicode **ucs4);
>+
> 
> static int mapUTF8(Unicode u, char *buf, int bufSize) {
>   if        (u <= 0x0000007f) {
>diff --git a/utils/pdfinfo.cc b/utils/pdfinfo.cc
>index cdc5375..d1c077b 100644
>--- a/utils/pdfinfo.cc
>+++ b/utils/pdfinfo.cc
>@@ -48,7 +48,7 @@
> #include "PDFDocFactory.h"
> #include "CharTypes.h"
> #include "UnicodeMap.h"
>-#include "PDFDocEncoding.h"
>+#include "UTF.h"
> #include "Error.h"
> #include "DateInfo.h"
> 
>@@ -379,41 +379,16 @@ static void printInfoString(Dict *infoDict, const char *key, const char *text,
> 			    UnicodeMap *uMap) {
>   Object obj;
>   GooString *s1;
>-  GBool isUnicode;
>-  Unicode u, u2;
>+  Unicode *u;
>   char buf[8];
>-  int i, n;
>+  int i, n, len;
> 
>   if (infoDict->lookup(key, &obj)->isString()) {
>     fputs(text, stdout);
>     s1 = obj.getString();
>-    if ((s1->getChar(0) & 0xff) == 0xfe &&
>-	(s1->getChar(1) & 0xff) == 0xff) {
>-      isUnicode = gTrue;
>-      i = 2;
>-    } else {
>-      isUnicode = gFalse;
>-      i = 0;
>-    }
>-    while (i < obj.getString()->getLength()) {
>-      if (isUnicode) {
>-	u = ((s1->getChar(i) & 0xff) << 8) |
>-	    (s1->getChar(i+1) & 0xff);
>-	i += 2;
>-	if (u >= 0xd800 && u <= 0xdbff && i < obj.getString()->getLength()) {
>-	  // surrogate pair
>-	  u2 = ((s1->getChar(i) & 0xff) << 8) |
>-	    (s1->getChar(i+1) & 0xff);
>-	  i += 2;
>-	  if (u2 >= 0xdc00 && u2 <= 0xdfff) {
>-	    u = 0x10000 + ((u - 0xd800) << 10) + (u2 - 0xdc00);
>-	  }
>-	}
>-      } else {
>-	u = pdfDocEncoding[s1->getChar(i) & 0xff];
>-	++i;
>-      }
>-      n = uMap->mapUnicode(u, buf, sizeof(buf));
>+    len = TextStringToUCS4(s1, &u);
>+    for (i = 0; i < len; i++) {
>+      n = uMap->mapUnicode(u[i], buf, sizeof(buf));
>       fwrite(buf, 1, n, stdout);
>     }
>     fputc('\n', stdout);
>-- 
>1.7.9.5
>

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