From 16832f98783c8bfdbabaf0844d918e7eb550b9d9 Mon Sep 17 00:00:00 2001
From: Stefan Weil <sw@weilnetz.de>
Date: Wed, 18 Jul 2018 10:34:34 +0200
Subject: [PATCH] Add helper functions for serialization of simple data types

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 src/ccutil/serialis.cpp | 65 ++++++++++++++++++++++++++++++++++++++++-
 src/ccutil/serialis.h   | 26 +++++++++++++++++
 2 files changed, 90 insertions(+), 1 deletion(-)

diff --git a/src/ccutil/serialis.cpp b/src/ccutil/serialis.cpp
index a6b036b9de..fef6029a78 100644
--- a/src/ccutil/serialis.cpp
+++ b/src/ccutil/serialis.cpp
@@ -24,6 +24,70 @@
 
 namespace tesseract {
 
+bool DeSerialize(FILE* fp, char* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool DeSerialize(FILE* fp, float* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool DeSerialize(FILE* fp, int8_t* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool DeSerialize(FILE* fp, int16_t* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool DeSerialize(FILE* fp, int32_t* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool DeSerialize(FILE* fp, uint8_t* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool DeSerialize(FILE* fp, uint16_t* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool DeSerialize(FILE* fp, uint32_t* data, size_t n) {
+  return fread(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const char* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const float* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const int8_t* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const int16_t* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const int32_t* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const uint8_t* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const uint16_t* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
+bool Serialize(FILE* fp, const uint32_t* data, size_t n) {
+  return fwrite(data, sizeof(*data), n, fp) == n;
+}
+
 TFile::TFile()
     : offset_(0),
       data_(nullptr),
@@ -172,5 +236,4 @@ int TFile::FWrite(const void* buffer, size_t size, int count) {
   return count;
 }
 
-
 }  // namespace tesseract.
diff --git a/src/ccutil/serialis.h b/src/ccutil/serialis.h
index de9e0eb875..ed9603bdb8 100644
--- a/src/ccutil/serialis.h
+++ b/src/ccutil/serialis.h
@@ -38,6 +38,12 @@ Replace <parm> with "<parm>".  <parm> may be an arbitrary number of tokens
 
 namespace tesseract {
 
+// Return number of elements of an array.
+template <typename T, size_t N>
+constexpr size_t countof(T const (&)[N]) noexcept {
+  return N;
+}
+
 // Function to read a GenericVector<char> from a whole file.
 // Returns false on failure.
 typedef bool (*FileReader)(const STRING& filename, GenericVector<char>* data);
@@ -46,6 +52,26 @@ typedef bool (*FileReader)(const STRING& filename, GenericVector<char>* data);
 typedef bool (*FileWriter)(const GenericVector<char>& data,
                            const STRING& filename);
 
+// Deserialize data from file.
+bool DeSerialize(FILE* fp, char* data, size_t n = 1);
+bool DeSerialize(FILE* fp, float* data, size_t n = 1);
+bool DeSerialize(FILE* fp, int8_t* data, size_t n = 1);
+bool DeSerialize(FILE* fp, int16_t* data, size_t n = 1);
+bool DeSerialize(FILE* fp, int32_t* data, size_t n = 1);
+bool DeSerialize(FILE* fp, uint8_t* data, size_t n = 1);
+bool DeSerialize(FILE* fp, uint16_t* data, size_t n = 1);
+bool DeSerialize(FILE* fp, uint32_t* data, size_t n = 1);
+
+// Serialize data to file.
+bool Serialize(FILE* fp, const char* data, size_t n = 1);
+bool Serialize(FILE* fp, const float* data, size_t n = 1);
+bool Serialize(FILE* fp, const int8_t* data, size_t n = 1);
+bool Serialize(FILE* fp, const int16_t* data, size_t n = 1);
+bool Serialize(FILE* fp, const int32_t* data, size_t n = 1);
+bool Serialize(FILE* fp, const uint8_t* data, size_t n = 1);
+bool Serialize(FILE* fp, const uint16_t* data, size_t n = 1);
+bool Serialize(FILE* fp, const uint32_t* data, size_t n = 1);
+
 // Simple file class.
 // Allows for portable file input from memory and from foreign file systems.
 class TFile {