Moving hash and file_io to core

Change-Id: I1e6eece53fadf62a8919aa41e04deee3dac2ce60

core/helpers/file_io.cpp

@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2017-2019 Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#include "file_io.h"
+
+#include "core/helpers/debug_helpers.h"
+#include "core/helpers/stdio.h"
+
+#include <cstring>
+#include <new>
+
+std::unique_ptr<char[]> loadDataFromFile(
+    const char *filename,
+    size_t &retSize) {
+    FILE *fp = nullptr;
+    size_t nsize = 0;
+    std::unique_ptr<char[]> ret;
+
+    DEBUG_BREAK_IF(nullptr == filename);
+    // Open the file
+    fopen_s(&fp, filename, "rb");
+    if (fp) {
+        // Allocate a buffer for the file contents
+        fseek(fp, 0, SEEK_END);
+        nsize = (size_t)ftell(fp);
+
+        fseek(fp, 0, SEEK_SET);
+
+        ret.reset(new (std::nothrow) char[nsize + 1]);
+
+        if (ret) {
+            // we initialize to all zeroes before reading in data
+            memset(ret.get(), 0x00, nsize + 1);
+            auto read = fread(ret.get(), sizeof(unsigned char), nsize, fp);
+            DEBUG_BREAK_IF(read != nsize);
+            ((void)(read));
+        } else {
+            nsize = 0;
+        }
+
+        fclose(fp);
+    }
+
+    retSize = nsize;
+    return ret;
+}
+
+size_t writeDataToFile(
+    const char *filename,
+    const void *pData,
+    size_t dataSize) {
+    FILE *fp = nullptr;
+    size_t nsize = 0;
+
+    DEBUG_BREAK_IF(nullptr == pData);
+    DEBUG_BREAK_IF(nullptr == filename);
+
+    fopen_s(&fp, filename, "wb");
+    if (fp) {
+        nsize = fwrite(pData, sizeof(unsigned char), dataSize, fp);
+        fclose(fp);
+    }
+
+    return nsize;
+}
+
+bool fileExists(const std::string &fileName) {
+    FILE *pFile = nullptr;
+
+    DEBUG_BREAK_IF(fileName.empty());
+    DEBUG_BREAK_IF(fileName == "");
+
+    fopen_s(&pFile, fileName.c_str(), "rb");
+    if (pFile) {
+        fclose(pFile);
+    }
+    return pFile != nullptr;
+}
+
+bool fileExistsHasSize(const std::string &fileName) {
+    FILE *pFile = nullptr;
+    size_t nsize = 0;
+
+    DEBUG_BREAK_IF(fileName.empty());
+    DEBUG_BREAK_IF(fileName == "");
+
+    fopen_s(&pFile, fileName.c_str(), "rb");
+    if (pFile) {
+        fseek(pFile, 0, SEEK_END);
+        nsize = (size_t)ftell(pFile);
+        fclose(pFile);
+    }
+    return pFile != nullptr && nsize > 0;
+}