strngs: Replace alloc_mem, free_mem by standard functions

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/ccutil/strngs.cpp

@@ -19,10 +19,10 @@
 
 #include "strngs.h"
 #include <cassert>          // for assert
+#include <cstdlib>          // for malloc, free
 #include "errcode.h"        // for ASSERT_HOST
 #include "genericvector.h"  // for GenericVector
 #include "helpers.h"        // for ReverseN
-#include "memry.h"          // for alloc_string, free_string
 #include "serialis.h"       // for TFile
 
 using tesseract::TFile;
@@ -51,7 +51,7 @@ const int kMaxDoubleSize = 16;
 const int kMinCapacity = 16;
 
 char* STRING::AllocData(int used, int capacity) {
-  data_ = (STRING_HEADER *)alloc_string(capacity + sizeof(STRING_HEADER));
+  data_ = (STRING_HEADER *)malloc(capacity + sizeof(STRING_HEADER));
 
   // header is the metadata for this memory block
   STRING_HEADER* header = GetHeader();
@@ -61,7 +61,8 @@ char* STRING::AllocData(int used, int capacity) {
 }
 
 void STRING::DiscardData() {
-  free_string((char *)data_);
+  free(data_);
+  data_ = nullptr;
 }
 
 // This is a private method; ensure FixHeader is called (or used_ is well defined)
@@ -78,7 +79,7 @@ char* STRING::ensure_cstr(int32_t min_capacity) {
     min_capacity = 2 * orig_header->capacity_;
 
   int alloc = sizeof(STRING_HEADER) + min_capacity;
-  STRING_HEADER* new_header = (STRING_HEADER*)(alloc_string(alloc));
+  STRING_HEADER* new_header = (STRING_HEADER*)(malloc(alloc));
 
   memcpy(&new_header[1], GetCStr(), orig_header->used_);
   new_header->capacity_ = min_capacity;