1 files changed, 62 insertions, 3 deletions
diff --git a/source/fud_c_file.cpp b/source/fud_c_file.cpp
index a85fd00..cad4c9d 100644
--- a/source/fud_c_file.cpp
+++ b/source/fud_c_file.cpp
@@ -29,7 +29,7 @@ CBinaryFile::CBinaryFile(const String& filename, CFileMode mode)
 CBinaryFile::CBinaryFile(const String& filename, CFileMode mode, const String& extraFlags)
     : m_filename{filename},
       m_extraFlags{extraFlags},
-      m_mode{String(CBinaryFileModeFromFlags(mode)).append(extraFlags)},
+      m_mode{String(CBinaryFileModeFromFlags(mode)).catenate(extraFlags)},
       m_modeFlags{mode}
 {
 }
@@ -137,8 +137,8 @@ ReadResult CBinaryFile::read(void* destination, size_t destinationSize, size_t l
         return result;
     }
 
-    auto* destPtr = static_cast<char*>(destination);
-    result.bytesRead = fread(destPtr, 1, length, m_file);
+    auto* destBytes = static_cast<char*>(destination);
+    result.bytesRead = fread(destBytes, 1, length, m_file);
     static_cast<void>(reset());
     if (result.bytesRead != length) {
         result.status = FileStatus::PartialSuccess;
@@ -149,6 +149,65 @@ ReadResult CBinaryFile::read(void* destination, size_t destinationSize, size_t l
     return result;
 }
 
+WriteResult CBinaryFile::write(const void* source, size_t sourceSize, size_t length)
+{
+    auto offsetResult = size();
+    if (offsetResult.isError()) {
+        return WriteResult{0, offsetResult.getError()};
+    }
+
+    return write(source, sourceSize, length, offsetResult.getOkay());
+}
+
+WriteResult CBinaryFile::write(const void* source, size_t sourceSize, size_t length, size_t offset)
+{
+    WriteResult result{};
+    if (length == 0) {
+        return result;
+    }
+
+    if (source == nullptr) {
+        result.status = FileStatus::NullPointer;
+        return result;
+    }
+
+    if (offset > LONG_MAX || SIZE_MAX - offset < length || sourceSize < length) {
+        result.status = FileStatus::InvalidArgument;
+        return result;
+    }
+
+    auto fileSizeResult = size();
+    if (fileSizeResult.isError()) {
+        result.status = fileSizeResult.getError();
+        return result;
+    }
+
+    // TODO: proper way of handling this
+    auto fileSize = fileSizeResult.getOkay();
+    int seekResult;
+    if (offset > fileSize) {
+        seekResult = fseek(m_file, 0, SEEK_END);
+    } else {
+        seekResult = fseek(m_file, static_cast<long>(offset), SEEK_SET);
+    }
+
+    if (seekResult != 0) {
+        result.status = FileStatus::Error;
+        return result;
+    }
+
+    auto* sourceBytes = static_cast<const char*>(source);
+    result.bytesWritten = fwrite(sourceBytes, 1, length, m_file);
+    static_cast<void>(reset());
+    if (result.bytesWritten != length) {
+        result.status = FileStatus::PartialSuccess;
+    } else {
+        result.status = FileStatus::Success;
+    }
+
+    return result;
+}
+
 FileStatus CBinaryFile::reset() const {
     if (!isOpen()) {
         return FileStatus::InvalidState;