RAII: ResultIterator::GetUTF8Text(): was leaked inside TessBaseAPI::GetUTF8Text()

Author: rfschtkt

api/baseapi.cpp

@@ -46,6 +46,7 @@
 #include <string>
 #include <iterator>
 #include <fstream>
+#include <memory> // std::unique_ptr
 
 #include "allheaders.h"
 
@@ -1267,9 +1268,8 @@ char* TessBaseAPI::GetUTF8Text() {
   ResultIterator *it = GetIterator();
   do {
     if (it->Empty(RIL_PARA)) continue;
-    char *para_text = it->GetUTF8Text(RIL_PARA);
-    text += para_text;
-    delete []para_text;
+    const std::unique_ptr<const char[]> para_text(it->GetUTF8Text(RIL_PARA));
+    text += para_text.get();
   } while (it->Next(RIL_PARA));
   char* result = new char[text.length() + 1];
   strncpy(result, text.string(), text.length() + 1);
@@ -1539,11 +1539,10 @@ char* TessBaseAPI::GetHOCRText(ETEXT_DESC* monitor, int page_number) {
     if (bold) hocr_str += "<strong>";
     if (italic) hocr_str += "<em>";
     do {
-      const char *grapheme = res_it->GetUTF8Text(RIL_SYMBOL);
+      const std::unique_ptr<const char[]> grapheme(res_it->GetUTF8Text(RIL_SYMBOL));
       if (grapheme && grapheme[0] != 0) {
-        hocr_str += HOcrEscape(grapheme);
+        hocr_str += HOcrEscape(grapheme.get());
       }
-      delete []grapheme;
       res_it->Next(RIL_SYMBOL);
     } while (!res_it->Empty(RIL_BLOCK) && !res_it->IsAtBeginningOf(RIL_WORD));
     if (italic) hocr_str += "</em>";
@@ -1661,7 +1660,7 @@ char* TessBaseAPI::GetTSVText(int page_number) {
     if (res_it->IsAtFinalElement(RIL_BLOCK, RIL_WORD)) bcnt++;
 
     do {
-      tsv_str += res_it->GetUTF8Text(RIL_SYMBOL);
+      tsv_str += std::unique_ptr<const char[]>(res_it->GetUTF8Text(RIL_SYMBOL)).get();
       res_it->Next(RIL_SYMBOL);
     } while (!res_it->Empty(RIL_BLOCK) && !res_it->IsAtBeginningOf(RIL_WORD));
     tsv_str += "\n";  // end of row

api/pdfrenderer.cpp

@@ -20,6 +20,7 @@
 #include "config_auto.h"
 #endif
 
+#include <memory> // std::unique_ptr
 #include "allheaders.h"
 #include "baseapi.h"
 #include "math.h"
@@ -460,10 +461,10 @@ char* TessPDFRenderer::GetPDFTextObjects(TessBaseAPI* api,
     STRING pdf_word("");
     int pdf_word_len = 0;
     do {
-      const char *grapheme = res_it->GetUTF8Text(RIL_SYMBOL);
+      const std::unique_ptr<const char[]> grapheme(res_it->GetUTF8Text(RIL_SYMBOL));
       if (grapheme && grapheme[0] != '\0') {
         GenericVector<int> unicodes;
-        UNICHAR::UTF8ToUnicode(grapheme, &unicodes);
+        UNICHAR::UTF8ToUnicode(grapheme.get(), &unicodes);
         char utf16[kMaxBytesPerCodepoint];
         for (int i = 0; i < unicodes.length(); i++) {
           int code = unicodes[i];
@@ -473,7 +474,6 @@ char* TessPDFRenderer::GetPDFTextObjects(TessBaseAPI* api,
           }
         }
       }
-      delete []grapheme;
       res_it->Next(RIL_SYMBOL);
     } while (!res_it->Empty(RIL_BLOCK) && !res_it->IsAtBeginningOf(RIL_WORD));
     if (word_length > 0 && pdf_word_len > 0 && fontsize > 0) {

ccmain/paragraphs.cpp

@@ -21,6 +21,7 @@
 #endif
 
 #include <ctype.h>
+#include <memory> // std::unique_ptr
 
 #include "genericvector.h"
 #include "helpers.h"
@@ -2446,8 +2447,8 @@ void InitializeRowInfo(bool after_recognition,
     return;
   }
   info->text = "";
-  char *text = it.GetUTF8Text(RIL_TEXTLINE);
-  int trailing_ws_idx = strlen(text);  // strip trailing space
+  const std::unique_ptr<const char[]> text(it.GetUTF8Text(RIL_TEXTLINE));
+  int trailing_ws_idx = strlen(text.get());  // strip trailing space
   while (trailing_ws_idx > 0 &&
          // isspace() only takes ASCII
          ((text[trailing_ws_idx - 1] & 0x80) == 0) &&
@@ -2460,7 +2461,6 @@ void InitializeRowInfo(bool after_recognition,
     for (int i = 0; i < trailing_ws_idx; i++)
       info->text += text[i];
   }
-  delete []text;
 
   if (info->text.size() == 0) {
     return;