From d4a2e054dee6ee80b578500e47f4eaf84731f140 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Sun, 29 Nov 2015 23:45:59 +0000
Subject: Take DCP-o-matic's version of Data class.

---
 src/data.cc | 71 +++++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 55 insertions(+), 16 deletions(-)

(limited to 'src/data.cc')

diff --git a/src/data.cc b/src/data.cc
index 66970c91..e8437361 100644
--- a/src/data.cc
+++ b/src/data.cc
@@ -17,40 +17,79 @@
 
 */
 
-/** @file  src/data.cc
- *  @brief Data class.
- */
-
 #include "data.h"
 #include "util.h"
 #include "exceptions.h"
 #include <cstdio>
+#include <cerrno>
 
+using boost::shared_array;
 using namespace dcp;
 
-/** Construct a Data object from the contents of a file.
- *  @param file File to read.
- */
+Data::Data ()
+	: _size (0)
+{
+
+}
+
+Data::Data (int size)
+	: _data (new uint8_t[size])
+	, _size (size)
+{
+
+}
+
+Data::Data (uint8_t const * data, int size)
+	: _data (new uint8_t[size])
+	, _size (size)
+{
+	memcpy (_data.get(), data, size);
+}
+
+Data::Data (shared_array<uint8_t> data, int size)
+	: _data (data)
+	, _size (size)
+{
+
+}
+
 Data::Data (boost::filesystem::path file)
 {
+	_size = boost::filesystem::file_size (file);
+	_data.reset (new uint8_t[_size]);
+
 	FILE* f = fopen_boost (file, "rb");
 	if (!f) {
 		throw FileError ("could not open file for reading", file, errno);
 	}
 
-	size = boost::filesystem::file_size (file);
-	data.reset (new uint8_t[size]);
-	size_t const read = fread (data.get(), 1, size, f);
+	size_t const r = fread (_data.get(), 1, _size, f);
+	if (r != size_t (_size)) {
+		fclose (f);
+		throw FileError ("could not read from file", file, errno);
+	}
+
 	fclose (f);
+}
 
-	if (read != size) {
-		throw FileError ("could not read file", file, -1);
+void
+Data::write (boost::filesystem::path file) const
+{
+	FILE* f = fopen_boost (file, "wb");
+	if (!f) {
+		throw FileError ("could not write to file", file, errno);
+	}
+	size_t const r = fwrite (_data.get(), 1, _size, f);
+	if (r != size_t (_size)) {
+		fclose (f);
+		throw FileError ("could not write to file", file, errno);
 	}
+	fclose (f);
 }
 
-Data::Data (uint8_t const * data_, boost::uintmax_t size_)
-	: data (new uint8_t[size])
-	, size (size_)
+void
+Data::write_via_temp (boost::filesystem::path temp, boost::filesystem::path final) const
 {
-	memcpy (data.get(), data_, size);
+	write (temp);
+	boost::filesystem::rename (temp, final);
 }
-- 
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