diff --git a/bootstrap.sh b/bootstrap.sh
index 6538894..c9f0d62 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -13,9 +13,12 @@ g++ $SOURCE_DIR/main.cpp \
        $CORE_SRC_DIR/data_structures/String.cpp \
        $CORE_SRC_DIR/filesystem/FileSystemPath.cpp \
        $CORE_SRC_DIR/filesystem/File.cpp \
+       $CORE_SRC_DIR/filesystem/FileFormats.cpp \
+       $CORE_SRC_DIR/filesystem/posix/FilePosixImpl.cpp \
        $CORE_SRC_DIR/filesystem/Directory.cpp \
        $CORE_SRC_DIR/logging/ConsoleLogger.cpp \
        $CORE_SRC_DIR/logging/Logger.cpp \
+       $CORE_SRC_DIR/system/process/Process.cpp \
        $CORE_SRC_DIR/time/Time.cpp \
        -o builder -g -fno-exceptions -fno-rtti \
         -I$CORE_SRC_DIR/base_types \
@@ -23,6 +26,7 @@ g++ $SOURCE_DIR/main.cpp \
         -I$CORE_SRC_DIR/data_structures \
         -I$CORE_SRC_DIR/encoding \
         -I$CORE_SRC_DIR/filesystem \
+        -I$CORE_SRC_DIR/filesystem/posix \
         -I$CORE_SRC_DIR/logging \
         -I$CORE_SRC_DIR/memory \
         -I$CORE_SRC_DIR/system/process \
diff --git a/src/base/compiler/BuildLibrary.h b/src/base/compiler/BuildLibrary.h
index e633b8b..8e497c7 100644
--- a/src/base/compiler/BuildLibrary.h
+++ b/src/base/compiler/BuildLibrary.h
@@ -10,14 +10,14 @@ public:
 
     BuildLibrary(const FileSystemPath& build_config);
 
-    Status scan();
-
     const Vector<FileSystemPath>& get_sources() const;
 
     const Vector<FileSystemPath>& get_include_dirs() const;
 
     const String& get_name() const;
 
+    Status scan();
+
 private:
     FileSystemPath m_build_config;
     Vector<FileSystemPath> m_sources;
diff --git a/src/base/core/base_types/ByteTypes.h b/src/base/core/base_types/Byte.h
similarity index 100%
rename from src/base/core/base_types/ByteTypes.h
rename to src/base/core/base_types/Byte.h
diff --git a/src/base/core/base_types/Error.cpp b/src/base/core/base_types/Error.cpp
index 2ecbb09..882dc8a 100644
--- a/src/base/core/base_types/Error.cpp
+++ b/src/base/core/base_types/Error.cpp
@@ -25,6 +25,13 @@ Status::Status(const Error& err)
 
 }
 
+Status Status::with_errno(const String& prefix_msg)
+{
+    Status ret;
+    ret.on_errno(prefix_msg);
+    return ret;
+}
+
 void Status::on_errno(const String& prefix_msg)
 {
     String errno_msg(::strerror(errno));
diff --git a/src/base/core/base_types/Error.h b/src/base/core/base_types/Error.h
index 8944ed8..4690f73 100644
--- a/src/base/core/base_types/Error.h
+++ b/src/base/core/base_types/Error.h
@@ -48,6 +48,8 @@ public:
 
     Status(const Error& err);
 
+    static Status with_errno(const String& prefix_msg);
+
     void on_errno(const String& prefix_msg);
 
     const Error& error() const;
diff --git a/src/base/core/data_structures/String.cpp b/src/base/core/data_structures/String.cpp
index 30b5ef7..3505821 100644
--- a/src/base/core/data_structures/String.cpp
+++ b/src/base/core/data_structures/String.cpp
@@ -146,6 +146,17 @@ void String::to_bytes(Vector<Byte>& bytes) const
     }
 }
 
+size_t String::length(const char* arr)
+{
+    size_t len{0};
+    while(*arr != '\0')
+    {
+        arr++;
+        len++;
+    }
+    return len;
+}
+
 void String::append(const Vector<Byte>& data)
 {
     if (data.empty())
diff --git a/src/base/core/data_structures/String.h b/src/base/core/data_structures/String.h
index 354b9d1..58c12ec 100644
--- a/src/base/core/data_structures/String.h
+++ b/src/base/core/data_structures/String.h
@@ -3,7 +3,7 @@
 #include "Vector.h"
 #include "Pair.h"
 #include "Index.h"
-#include "ByteTypes.h"
+#include "Byte.h"
 
 #include <functional>
 
@@ -29,6 +29,8 @@ public:
     using erasePredicate = std::function<bool(char)>;
     void eraseIf(erasePredicate func);
 
+    static size_t length(const char* arr);
+
     bool is_whitespace() const;
 
     void push_back(char c);
diff --git a/src/base/core/encoding/Bits.h b/src/base/core/encoding/Bits.h
index 95806b6..bd62d88 100644
--- a/src/base/core/encoding/Bits.h
+++ b/src/base/core/encoding/Bits.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "ByteTypes.h"
+#include "Byte.h"
 #include "String.h"
 
 class Bits
diff --git a/src/base/core/encoding/StringUtils.h b/src/base/core/encoding/StringUtils.h
index d31b1cc..c091bdc 100644
--- a/src/base/core/encoding/StringUtils.h
+++ b/src/base/core/encoding/StringUtils.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "ByteTypes.h"
+#include "Byte.h"
 
 #include "String.h"
 #include "Vector.h"
diff --git a/src/base/core/filesystem/BinaryFile.cpp b/src/base/core/filesystem/BinaryFile.cpp
new file mode 100644
index 0000000..30eef63
--- /dev/null
+++ b/src/base/core/filesystem/BinaryFile.cpp
@@ -0,0 +1,31 @@
+#include "BinaryFile.h"
+
+Status BinaryFile::to_readable(InputStream<Byte>& input, 
+        OutputStream<Byte>& output)
+{
+    String sstr;
+    sstr << "Count | Binary | Decimal | Hex | ASCII \n";
+    
+    Byte b{0};
+    while(input.get(b))
+    {
+        unsigned count = 0;
+    }
+    
+    /*
+    for(const auto byte : buffer)
+    {
+        const auto ascii_val = std::isalpha(byte) ? byte : '.';
+        String hex_sstr;
+        hex_sstr << std::setfill('0') << std::setw(2) << std::hex << static_cast<int>(byte);
+
+        sstr << count << " | " << Bits::toString(byte) << " | " << static_cast<int>(byte) << " | " << hex_sstr.str() << " | " << ascii_val << '\n';
+        if (count % 10 == 0)
+        {
+            sstr << "\n";
+        }
+        count++;
+    }
+    */
+    return {};
+}
\ No newline at end of file
diff --git a/src/base/core/filesystem/BinaryFile.h b/src/base/core/filesystem/BinaryFile.h
new file mode 100644
index 0000000..7eff989
--- /dev/null
+++ b/src/base/core/filesystem/BinaryFile.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include "Stream.h"
+#include "Byte.h"
+#include "Error.h"
+
+class BinaryFile
+{
+public:
+    static Status to_readable(InputStream<Byte>& input, 
+        OutputStream<Byte>& output);
+};
\ No newline at end of file
diff --git a/src/base/core/filesystem/File.cpp b/src/base/core/filesystem/File.cpp
index 63ba4c8..be2cd39 100644
--- a/src/base/core/filesystem/File.cpp
+++ b/src/base/core/filesystem/File.cpp
@@ -3,148 +3,10 @@
 #include "Char.h"
 #include "Directory.h"
 #include "Result.h"
-
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-
-class FileImpl
-{
-public:
-    Status do_open(const FileSystemPath& path, File::AccessMode accessMode)
-    {
-        int flags{0};
-        if (accessMode == File::AccessMode::Read)
-        {
-            flags |= O_RDONLY;
-        }
-        else
-        {
-            flags |= O_WRONLY;
-            flags |= O_CREAT;
-        }
-        errno = 0;
-        m_fd = ::open(path.str().raw(), flags);
-        if (m_fd < 0)
-        {
-            Status ret;
-            ret.on_errno("Failed to open file with");
-            return ret;
-        }
-
-        if (accessMode == File::AccessMode::Read)
-        {
-            m_open_for_read = true;
-        }
-        else
-        {
-            m_open_for_write = true;
-        }
-        return {};
-    }
-
-    Status do_close()
-    {
-        errno = 0;
-        const auto rc = ::close(m_fd);
-        if (rc < 0)
-        {
-            Status ret;
-            ret.on_errno("Failed to close file with");
-            return ret;          
-        }
-        m_open_for_read = false;
-        m_open_for_write = false;
-        return {};
-    }
-
-    bool is_ok() const
-    {
-        return m_valid;
-    }
-
-    bool is_open_for_read() const
-    {
-        return m_open_for_read;
-    }
-
-    bool is_open_for_write() const 
-    {
-        return m_open_for_write;
-    }
-
-    Result<size_t> do_read(VecBytes& bytes)
-    {
-        errno = 0;
-        const auto rc = ::read(m_fd, bytes.data(), bytes.capacity());
-        if (rc < 0)
-        {
-            const auto msg = _s("Error in read impl | ") + Error::from_errno();
-            return Result<size_t>(Error(msg));
-        }
-        return Result<size_t>(rc);
-    }
-
-    Result<size_t> do_write(const VecBytes& bytes)
-    {
-        errno = 0;
-        const auto rc = ::write(m_fd, bytes.data(), bytes.size());
-        if (rc < 0)
-        {
-            const auto msg = _s("Error in write impl | ") + Error::from_errno();
-            return Result<size_t>(Error(msg));
-        }   
-        return Result<size_t>(rc);
-    }
-
-    Result<size_t> do_write(const Vector<char>& bytes, int size = -1)
-    {
-        errno = 0;
-        int rc = 0;
-        if (size > -1)
-        {
-            rc = ::write(m_fd, bytes.data(), size);
-        }
-        else
-        {
-            rc = ::write(m_fd, bytes.data(), bytes.size());
-        }
-        if (rc < 0)
-        {
-            const auto msg = _s("Error in write impl | ") + Error::from_errno();
-            return Result<size_t>(Error(msg));
-        }   
-        return Result<size_t>(rc);   
-    }
-
-    Status update_size()
-    {
-        struct stat buf;
-        const auto rc = ::fstat(m_fd, &buf);
-        if (rc != 0)
-        {
-            Status ret;
-            ret.on_errno("Failed to get size with fstat");
-            return ret;        
-        }
-        m_size = buf.st_size;
-        return {};
-    }
-
-    bool m_open_for_write{false};
-    bool m_open_for_read{false};
-    bool m_valid{false};
-    size_t m_size{0};
-    bool m_is_open{false};
-    int m_fd{-1};
-};
+#include "FilePosixImpl.h"
 
 File::File(const FileSystemPath& path)
-    : m_impl(Ptr<FileImpl>::create()),
+    : m_impl(Ptr<FilePosixImpl>::create()),
       m_path(path)
 {
 }
@@ -154,23 +16,46 @@ File::~File()
     close();
 }
 
+Status File::close()
+{
+    return m_impl->do_close();
+}
+
+bool File::exists() const
+{
+    return m_path.exists();
+}
+
 String File::getExtension() const
 {
     return m_path.extension();
 }
 
-Status File::readBinary(VecBytes& buffer)
+FileFormat::Format File::inferFormat() const
 {
-    auto status = open(AccessMode::Read, true);
-    if (!status.ok())
+    const auto extension = getExtension();
+    return FileFormat::inferFormat(extension);
+}
+
+Status File::open(AccessMode accessMode)
+{
+    if (m_path.is_absolute() && !m_path.parent_path().exists())
     {
-        return status;
+        Directory::create(m_path.parent_path(), true);
+    }
+    return m_impl->do_open(m_path, accessMode);
+}
+
+Status File::read(VecBytes& buffer)
+{
+    if (const auto rc = open(AccessMode::Read); !rc.ok())
+    {
+        return rc;
     }
 
-    status = m_impl->update_size();
-    if (!status.ok())
+    if (const auto rc = m_impl->update_size(); !rc.ok())
     {
-        return status;
+        return rc;
     }
 
     buffer.resize(m_impl->m_size);
@@ -183,17 +68,15 @@ Status File::readBinary(VecBytes& buffer)
     return {};
 }
 
-Status File::readText(String& ret)
+Status File::read(String& ret)
 {
-    auto status = open(AccessMode::Read, true);
-    if (!status.ok())
+    if (const auto rc = open(AccessMode::Read); !rc.ok())
     {
-        return status;
+        return rc;
     }
 
     VecBytes buffer;
-    status = m_impl->update_size();
-    if (status.ok() && m_impl->m_size > 0)
+    if (const auto rc = m_impl->update_size(); rc.ok() && m_impl->m_size > 0)
     {
         buffer.resize(m_impl->m_size);
         const auto result = m_impl->do_read(buffer);
@@ -232,85 +115,7 @@ Status File::readText(String& ret)
     return {};
 }
 
-String File::dumpBinary()
-{
-    open(AccessMode::Read);
-
-    String sstr;
-    sstr << "Count | Binary | Decimal | Hex | ASCII \n";
-    
-    VecBytes buffer;
-    readBinary(buffer);
-
-    unsigned count = 0;
-    /*
-    for(const auto byte : buffer)
-    {
-        const auto ascii_val = std::isalpha(byte) ? byte : '.';
-        String hex_sstr;
-        hex_sstr << std::setfill('0') << std::setw(2) << std::hex << static_cast<int>(byte);
-
-        sstr << count << " | " << Bits::toString(byte) << " | " << static_cast<int>(byte) << " | " << hex_sstr.str() << " | " << ascii_val << '\n';
-        if (count % 10 == 0)
-        {
-            sstr << "\n";
-        }
-        count++;
-    }
-    */
-    close();
-    return sstr;
-}
-
-Optional<Byte> File::readNextByte()
-{
-    if (!open(AccessMode::Read).ok())
-    {
-        return {};
-    }
-
-    if (m_impl->is_ok())
-    {
-        VecBytes buffer(1);
-        m_impl->do_read(buffer);
-        if (buffer[0] == EOF)
-        {
-            return {};
-        }
-        else
-        {
-            return buffer[0];
-        }
-    }
-    else
-    {
-        return {};
-    }
-}
-
-Status File::open(AccessMode accessMode, bool binary)
-{
-    if (m_path.is_absolute() && !m_path.parent_path().exists())
-    {
-        Directory::create(m_path.parent_path(), true);
-    }
-
-    return m_impl->do_open(m_path, accessMode);
-}
-
-Status File::close()
-{
-    return m_impl->do_close();
-}
-
-FileFormat::Format File::inferFormat() const
-{
-    //const auto extension = getExtension();
-    //return FileFormat::inferFormat(extension);
-    return {};
-}
-
-Status File::writeText(const String& text)
+Status File::write(const String& text)
 {
     bool had_to_open{false};
     Status status;
@@ -334,54 +139,4 @@ Status File::writeText(const String& text)
         status = m_impl->do_close();
     }
     return status;
-}
-
-Status File::readLines(Vector<String>& lines)
-{
-    /*
-    if (!pathExists())
-    {
-        return {};
-    }
-
-    if(!open(AccessMode::Read))
-    {
-        return {};
-    }
-
-    String str;
-    while(std::getline(*mInHandle, str))
-    {
-        content.push_back(str);
-    }
-
-    close();
-    */
-    return {};
-}
-
-Status File::read(String& ret)
-{
-    /*
-    if (!pathExists())
-    {
-        return {};
-    }
-
-    if(!open(AccessMode::Read))
-    {
-        return {};
-    }
-
-    String buffer;
-    buffer << mInHandle->rdbuf();
-
-    close();
-    */
-    return {};
-}
-
-bool File::exists() const
-{
-    return m_path.exists();
-}
+}
\ No newline at end of file
diff --git a/src/base/core/filesystem/File.h b/src/base/core/filesystem/File.h
index 28fbcb5..335b8bd 100644
--- a/src/base/core/filesystem/File.h
+++ b/src/base/core/filesystem/File.h
@@ -2,20 +2,18 @@
 
 #include "FileFormats.h"
 #include "FileSystemPath.h"
-#include "Optional.h"
 #include "String.h"
-#include "ByteTypes.h"
+#include "Byte.h"
 #include "Pointer.h"
 
-class FileImpl;
+class FilePosixImpl;
 
 class File
 {
 public:
     enum class AccessMode{
         Read,
-        Write,
-        ReadWrite
+        Write
     };
 
 public:
@@ -25,29 +23,26 @@ public:
 
     Status close();
 
-    String dumpBinary();
+    bool exists() const;
+
+    bool finished() const;
 
     String getExtension() const;
 
     FileFormat::Format inferFormat() const;
 
-    Status readText(String& buffer);
+    Status open(AccessMode mode);
 
-    Status readLines(Vector<String>& lines);
+    Status read(VecBytes& bytes);
 
     Status read(String& buffer);
 
-    bool exists() const;
+    Status write(const String& buffer);
 
-    Status open(AccessMode mode, bool binary = false);
-
-    Status readBinary(VecBytes& bytes);
-
-    Optional<Byte> readNextByte();
-
-    Status writeText(const String& text);
+    Status write(const VecBytes& bytes);
 
 private:
-    Ptr<FileImpl> m_impl;
+    Ptr<FilePosixImpl> m_impl;
     FileSystemPath m_path;
+    bool mGotEndOfFile{false};
 };
diff --git a/src/base/core/filesystem/posix/FilePosixImpl.cpp b/src/base/core/filesystem/posix/FilePosixImpl.cpp
new file mode 100644
index 0000000..438da5f
--- /dev/null
+++ b/src/base/core/filesystem/posix/FilePosixImpl.cpp
@@ -0,0 +1,121 @@
+#include "FilePosixImpl.h"
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+Status FilePosixImpl::do_open(const FileSystemPath& path, File::AccessMode accessMode)
+{
+    int flags{0};
+    if (accessMode == File::AccessMode::Read)
+    {
+        flags |= O_RDONLY;
+    }
+    else
+    {
+        flags |= O_WRONLY;
+        flags |= O_CREAT;
+    }
+    errno = 0;
+    m_fd = ::open(path.str().raw(), flags);
+    if (m_fd < 0)
+    {
+        return Status::with_errno("Failed to open file with");
+    }
+
+    if (accessMode == File::AccessMode::Read)
+    {
+        m_open_for_read = true;
+    }
+    else
+    {
+        m_open_for_write = true;
+    }
+    return {};
+}
+
+Status FilePosixImpl::do_close()
+{
+    errno = 0;
+    if (const auto rc = ::close(m_fd); rc < 0)
+    {
+        Status::with_errno("Failed to close file with");         
+    }
+    m_open_for_read = false;
+    m_open_for_write = false;
+    return {};
+}
+
+bool FilePosixImpl::is_ok() const
+{
+    return m_valid;
+}
+
+bool FilePosixImpl::is_open_for_read() const
+{
+    return m_open_for_read;
+}
+
+bool FilePosixImpl::is_open_for_write() const 
+{
+    return m_open_for_write;
+}
+
+Result<size_t> FilePosixImpl::do_read(VecBytes& bytes)
+{
+    errno = 0;
+    const auto rc = ::read(m_fd, bytes.data(), bytes.capacity());
+    if (rc < 0)
+    {
+        const auto msg = _s("Error in read impl | ") + Error::from_errno();
+        return Result<size_t>(Error(msg));
+    }
+    return Result<size_t>(rc);
+}
+
+Result<size_t> FilePosixImpl::do_write(const VecBytes& bytes)
+{
+    errno = 0;
+    const auto rc = ::write(m_fd, bytes.data(), bytes.size());
+    if (rc < 0)
+    {
+        const auto msg = _s("Error in write impl | ") + Error::from_errno();
+        return Result<size_t>(Error(msg));
+    }   
+    return Result<size_t>(rc);
+}
+
+Result<size_t> FilePosixImpl::do_write(const Vector<char>& bytes, int size)
+{
+    errno = 0;
+    int rc = 0;
+    if (size > -1)
+    {
+        rc = ::write(m_fd, bytes.data(), size);
+    }
+    else
+    {
+        rc = ::write(m_fd, bytes.data(), bytes.size());
+    }
+    if (rc < 0)
+    {
+        const auto msg = _s("Error in write impl | ") + Error::from_errno();
+        return Result<size_t>(Error(msg));
+    }   
+    return Result<size_t>(rc);   
+}
+
+Status FilePosixImpl::update_size()
+{
+    struct stat buf;
+    if (const auto rc = ::fstat(m_fd, &buf); rc != 0)
+    {
+        return Status::with_errno("Failed to get size with fstat");    
+    }
+    m_size = buf.st_size;
+    return {};
+}
\ No newline at end of file
diff --git a/src/base/core/filesystem/posix/FilePosixImpl.h b/src/base/core/filesystem/posix/FilePosixImpl.h
new file mode 100644
index 0000000..0409ac1
--- /dev/null
+++ b/src/base/core/filesystem/posix/FilePosixImpl.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "FileSystemPath.h"
+#include "File.h"
+
+class FilePosixImpl
+{
+public:
+    Status do_open(const FileSystemPath& path, 
+        File::AccessMode accessMode);
+
+    Status do_close();
+
+    bool is_ok() const;
+
+    bool is_open_for_read() const;
+
+    bool is_open_for_write() const;
+
+    Result<size_t> do_read(VecBytes& bytes);
+
+    Result<size_t> do_write(const VecBytes& bytes);
+
+    Result<size_t> do_write(const Vector<char>& bytes, int size = -1);
+
+    Status update_size();
+
+    bool m_open_for_write{false};
+    bool m_open_for_read{false};
+    bool m_valid{false};
+    size_t m_size{0};
+    bool m_is_open{false};
+    int m_fd{-1};
+};
\ No newline at end of file
diff --git a/src/base/core/serialization/json/JsonParser.cpp b/src/base/core/serialization/json/JsonParser.cpp
index 0749f2f..308cc91 100644
--- a/src/base/core/serialization/json/JsonParser.cpp
+++ b/src/base/core/serialization/json/JsonParser.cpp
@@ -2,7 +2,6 @@
 
 Ptr<JsonDocument> JsonParser::read(const FileSystemPath& input_file)
 {
-
     return {};
 }
 
diff --git a/src/base/core/serialization/toml/TomlReader.cpp b/src/base/core/serialization/toml/TomlReader.cpp
index 2d7c772..aff7c05 100644
--- a/src/base/core/serialization/toml/TomlReader.cpp
+++ b/src/base/core/serialization/toml/TomlReader.cpp
@@ -69,7 +69,12 @@ TomlContent* TomlReader::getContent() const
 void TomlReader::read(const FileSystemPath& input_path)
 {
     Vector<String> lines;
-    File(input_path).readLines(lines);
+    File input_file(input_path);
+
+    String buffer;
+    input_file.read(buffer);
+    buffer.split(lines, '\n');
+
     mLastSectionOffset = 0;
     mWorkingTable = mContent->getRootTable();
 
diff --git a/src/base/core/streams/BinaryStream.h b/src/base/core/streams/BinaryStream.h
index 9b36c00..c84297f 100644
--- a/src/base/core/streams/BinaryStream.h
+++ b/src/base/core/streams/BinaryStream.h
@@ -3,7 +3,7 @@
 #include "Stream.h"
 #include "String.h"
 #include "Optional.h"
-#include "ByteTypes.h"
+#include "Byte.h"
 
 class BinaryStream
 {
diff --git a/src/base/core/streams/BitStream.cpp b/src/base/core/streams/BitStream.cpp
index eb9ba2d..b827845 100644
--- a/src/base/core/streams/BitStream.cpp
+++ b/src/base/core/streams/BitStream.cpp
@@ -11,7 +11,8 @@ Byte BitStream::getCurrentByte()
 {
     if (mByteOffset < 0)
     {
-        readNextByte();
+        Byte buffer;
+        readNextByte(buffer);
     }
     return mCurrentByte;
 }
@@ -109,9 +110,10 @@ void BitStream::writeNBits(DWord data, size_t length)
 
 bool BitStream::readNextNBits(size_t n, Byte& buffer)
 {
+    Byte internal_buffer;
     if (mByteOffset < 0)
     {
-        if (!readNextByte())
+        if (!readNextByte(internal_buffer))
         {
             return false;
         }
@@ -121,7 +123,7 @@ bool BitStream::readNextNBits(size_t n, Byte& buffer)
     if (overshoot > 0)
     {
         const auto last_byte = mCurrentByte;
-        if (!readNextByte())
+        if (!readNextByte(internal_buffer))
         {
             return false;
         }
diff --git a/src/base/core/streams/BitStream.h b/src/base/core/streams/BitStream.h
index 5e66ee2..973701d 100644
--- a/src/base/core/streams/BitStream.h
+++ b/src/base/core/streams/BitStream.h
@@ -1,7 +1,7 @@
 #pragma once
 
 #include "AbstractChecksumCalculator.h"
-#include "ByteTypes.h"
+#include "Byte.h"
 #include "String.h"
 #include "Optional.h"
 #include "Pair.h"
@@ -27,7 +27,7 @@ public:
 
     virtual bool readNextNBits(size_t n, Byte& buffer);
 
-    virtual Optional<Byte> readNextByte() = 0;
+    virtual bool readNextByte(Byte& ret) = 0;
 
     virtual void writeNBits(DWord data, size_t length);
 
diff --git a/src/base/core/streams/BufferBitStream.cpp b/src/base/core/streams/BufferBitStream.cpp
index a7cca60..92db816 100644
--- a/src/base/core/streams/BufferBitStream.cpp
+++ b/src/base/core/streams/BufferBitStream.cpp
@@ -30,17 +30,18 @@ void BufferBitStream::peekNextNBytes(size_t n, VecBytes& ret) const
     }
 }
 
-Optional<uint8_t> BufferBitStream::readNextByte()
+bool BufferBitStream::readNextByte(Byte& byte)
 {
     if (mByteOffset + 1 == static_cast<int>(mBuffer.size()))
     {
-        return {};
+        return false;
     }
     else
     {
         mByteOffset++;
         mCurrentByte = mBuffer[mByteOffset];
-        return mCurrentByte;
+        byte = mCurrentByte;
+        return true;
     }
 }
 
@@ -49,9 +50,9 @@ void BufferBitStream::setBuffer(const VecBytes& data)
     mBuffer = data;
 }
 
-void BufferBitStream::writeByte(uint8_t data, bool checkOverflow)
+void BufferBitStream::writeByte(Byte data, bool checkOverflow)
 {
-    uint8_t out_byte{0};
+    Byte out_byte{0};
     if (checkOverflow && mBitOffset > 0)
     {
         out_byte = Bits::getLowerNBits(mCurrentByte, mBitOffset);
diff --git a/src/base/core/streams/BufferBitStream.h b/src/base/core/streams/BufferBitStream.h
index 7009a5c..5960087 100644
--- a/src/base/core/streams/BufferBitStream.h
+++ b/src/base/core/streams/BufferBitStream.h
@@ -11,13 +11,13 @@ public:
 
     void peekNextNBytes(size_t n, VecBytes& bytes) const override;
 
-    Optional<uint8_t> readNextByte() override;
+    bool readNextByte(Byte& byte) override;
 
     void reset() override;
 
     void setBuffer(const VecBytes& data);
 
-    void writeByte(uint8_t data, bool checkOverflow = true) override;
+    void writeByte(Byte data, bool checkOverflow = true) override;
 
     void writeBytes(const VecBytes& data) override;
 
diff --git a/src/base/core/streams/ByteStream.cpp b/src/base/core/streams/ByteStream.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/base/core/streams/ByteStream.h b/src/base/core/streams/ByteStream.h
new file mode 100644
index 0000000..597c6ef
--- /dev/null
+++ b/src/base/core/streams/ByteStream.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "Stream.h"
+#include "String.h"
+
+using OutputByteStream = OutputByteStream<Byte>;
+
+inline void operator<<(OutputByteStream& stream, const char* string)
+{
+
+}
\ No newline at end of file
diff --git a/src/base/core/streams/FileStream.h b/src/base/core/streams/FileStream.h
index 88c1081..5def528 100644
--- a/src/base/core/streams/FileStream.h
+++ b/src/base/core/streams/FileStream.h
@@ -1,11 +1,32 @@
 #pragma once
 
-#include "ByteTypes.h"
+#include "Byte.h"
 #include "Stream.h"
 #include "FileSystemPath.h"
+#include "File.h"
 
 class InputFileStream : public InputStream<Byte>
 {
 public:
-    
+    InputFileStream(const FileSystemPath& path)
+        : File(path)
+    {
+
+    }
+
+    bool good() const override
+    {
+        return 
+    }
+
+    bool get(T& item) = 0;
+
+private:
+    void finished()
+    {
+        
+    }
+
+    File mFile;
+    Status mStatus;
 };
\ No newline at end of file
diff --git a/src/base/core/streams/InputBitStream.cpp b/src/base/core/streams/InputBitStream.cpp
index eb0b4df..02a1bdd 100644
--- a/src/base/core/streams/InputBitStream.cpp
+++ b/src/base/core/streams/InputBitStream.cpp
@@ -16,15 +16,16 @@ void InputBitStream::peekNextNBytes(size_t, VecBytes&) const
 {
 }
 
-Optional<Byte> InputBitStream::readNextByte()
+bool InputBitStream::readNextByte(Byte& buffer)
 {
     if (mStream->good())
     {
-        return static_cast<Byte>(mStream->get());
+        buffer = static_cast<Byte>(mStream->get());
+        return true;
     }
     else
     {
-        return {};
+        return false;
     }
 }
 
diff --git a/src/base/core/streams/InputBitStream.h b/src/base/core/streams/InputBitStream.h
index a3487d5..6cd0b1c 100644
--- a/src/base/core/streams/InputBitStream.h
+++ b/src/base/core/streams/InputBitStream.h
@@ -2,7 +2,7 @@
 
 #include "BitStream.h"
 #include "Stream.h"
-#include "ByteTypes.h"
+#include "Byte.h"
 
 class InputBitStream : public BitStream
 {
@@ -12,13 +12,12 @@ class InputBitStream : public BitStream
 
     void peekNextNBytes(size_t n, VecBytes& bytes) const override;
 
-    Optional<Byte> readNextByte() override;
+    bool readNextByte(Byte& buffer) override;
 
     void writeByte(Byte data, bool checkOverflow = true) override;
 
     void writeBytes(const VecBytes&) override
     {
-
     }
 
 private:
diff --git a/src/base/core/streams/OutputBitStream.cpp b/src/base/core/streams/OutputBitStream.cpp
index 23128f2..a1c1acc 100644
--- a/src/base/core/streams/OutputBitStream.cpp
+++ b/src/base/core/streams/OutputBitStream.cpp
@@ -17,12 +17,12 @@ void OutputBitStream::peekNextNBytes(size_t, VecBytes&) const
 
 }
 
-Optional<uint8_t> OutputBitStream::readNextByte()
+bool OutputBitStream::readNextByte(Byte& buffer)
 {
-    return {};
+    return false;
 }
 
-void OutputBitStream::writeByte(uint8_t data, bool)
+void OutputBitStream::writeByte(Byte data, bool)
 {
     //(*mStream) << data;
 }
diff --git a/src/base/core/streams/OutputBitStream.h b/src/base/core/streams/OutputBitStream.h
index 0b251f4..f59bd73 100644
--- a/src/base/core/streams/OutputBitStream.h
+++ b/src/base/core/streams/OutputBitStream.h
@@ -2,7 +2,7 @@
 
 #include "BitStream.h"
 #include "Stream.h"
-#include "ByteTypes.h"
+#include "Byte.h"
 
 class OutputBitStream : public BitStream
 {
@@ -13,7 +13,7 @@ public:
 
     void peekNextNBytes(size_t n, VecBytes& bytes) const override;
 
-    Optional<Byte> readNextByte() override;
+    bool readNextByte(Byte& buffer) override;
 
     void writeByte(Byte data, bool checkOverflow = true) override;
 
diff --git a/src/base/core/streams/Stream.h b/src/base/core/streams/Stream.h
index ed7b6b9..d8a7b79 100644
--- a/src/base/core/streams/Stream.h
+++ b/src/base/core/streams/Stream.h
@@ -23,7 +23,6 @@ public:
         }
         return {};
     }
-
     virtual bool get(T& item) = 0;
 };
 
diff --git a/src/base/core/system/process/Process.cpp b/src/base/core/system/process/Process.cpp
new file mode 100644
index 0000000..9bb9f37
--- /dev/null
+++ b/src/base/core/system/process/Process.cpp
@@ -0,0 +1,70 @@
+#include "Process.h"
+
+#include "Logger.h"
+#include "File.h"
+
+#include <unistd.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+Status Process::launch(const String& command, 
+    const Vector<String>& args)
+{
+    const auto pid = fork();
+    if (pid < 0)
+    {
+        ON_ERRNO("Failed to fork");
+    }
+
+    if (pid == 0)
+    {
+        char* exe_args[args.size()+2];
+        exe_args[0] = const_cast<char*>(command.raw());
+        for(size_t idx = 1; idx<args.size()+1; idx++)
+        {
+            //LOG_INFO(args[idx-1]);
+            exe_args[idx] = const_cast<char*>(args[idx-1].raw());
+        }
+        exe_args[args.size()+1] = nullptr;
+        errno = 0;
+        auto rc = execv(command.raw(), exe_args);
+        if (rc != 0)
+        {
+            LOG_ERROR("External proc failed: " << Error::from_errno());
+            exit(EXIT_FAILURE);
+        }
+        exit(EXIT_SUCCESS);
+    }
+    else
+    {
+        int status;
+        auto rc = wait(&status);
+        if (rc < 0)
+        {
+            ON_ERRNO("Failed to wait");
+        }
+        if (!WIFEXITED(status))
+        {
+            return Status(Error("Process child did not termintate normally"));
+        }
+        if (WEXITSTATUS(status) != EXIT_SUCCESS)
+        {
+            return Status(Error("Process child terminated with failure"));
+        }
+    }
+    return {};
+}
+
+Result<String> Process::get_self_name()
+{
+    FileSystemPath path(String("/proc/self/cmdline"));
+    File sys_file(path);
+
+    Result<String> ret;
+    const auto rc = sys_file.read(ret.value());
+    if (!rc.ok())
+    {
+        ret.on_error(rc.error());
+    }
+    return ret;
+}
\ No newline at end of file
diff --git a/src/base/core/system/process/Process.h b/src/base/core/system/process/Process.h
index 524d0d4..db11a91 100644
--- a/src/base/core/system/process/Process.h
+++ b/src/base/core/system/process/Process.h
@@ -1,77 +1,13 @@
 #pragma once
 
 #include "String.h"
-
-#include "File.h"
 #include "Result.h"
-#include "Logger.h"
-
-#include <unistd.h>
-#include <sys/wait.h>
-#include <errno.h>
 
 class Process
 {
 public:
+    static Result<String> get_self_name();
+
     static Status launch(const String& command, 
-        const Vector<String>& args)
-    {
-        const auto pid = fork();
-        if (pid < 0)
-        {
-            ON_ERRNO("Failed to fork");
-        }
-
-        if (pid == 0)
-        {
-            char* exe_args[args.size()+2];
-            exe_args[0] = const_cast<char*>(command.raw());
-            for(size_t idx = 1; idx<args.size()+1; idx++)
-            {
-                //LOG_INFO(args[idx-1]);
-                exe_args[idx] = const_cast<char*>(args[idx-1].raw());
-            }
-            exe_args[args.size()+1] = nullptr;
-            errno = 0;
-            auto rc = execv(command.raw(), exe_args);
-            if (rc != 0)
-            {
-                LOG_ERROR("External proc failed: " << Error::from_errno());
-                exit(EXIT_FAILURE);
-            }
-            exit(EXIT_SUCCESS);
-        }
-        else
-        {
-            int status;
-            auto rc = wait(&status);
-            if (rc < 0)
-            {
-                ON_ERRNO("Failed to wait");
-            }
-            if (!WIFEXITED(status))
-            {
-                return Status(Error("Process child did not termintate normally"));
-            }
-            if (WEXITSTATUS(status) != EXIT_SUCCESS)
-            {
-                return Status(Error("Process child terminated with failure"));
-            }
-        }
-        return {};
-    }
-
-    static Result<String> get_self_name()
-    {
-        FileSystemPath path(String("/proc/self/cmdline"));
-        File sys_file(path);
-
-        Result<String> ret;
-        const auto rc = sys_file.readText(ret.value());
-        if (!rc.ok())
-        {
-            ret.on_error(rc.error());
-        }
-        return ret;
-    }
+        const Vector<String>& args);
 };
\ No newline at end of file
diff --git a/src/media/image/png/PngInfo.h b/src/media/image/png/PngInfo.h
index 8f0966e..7fcc379 100644
--- a/src/media/image/png/PngInfo.h
+++ b/src/media/image/png/PngInfo.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "ByteTypes.h"
+#include "Byte.h"
 
 #include "String.h"
 #include <sstream>
diff --git a/test/bootstrap_tests.sh b/test/bootstrap_tests.sh
index 3225e3b..aabb1cb 100755
--- a/test/bootstrap_tests.sh
+++ b/test/bootstrap_tests.sh
@@ -6,6 +6,7 @@ g++ $SCRIPT_DIR/test_runner.cpp \
     $CORE_SRC_DIR/system/process/CommandLineArgs.cpp \
     $CORE_SRC_DIR/base_types/Error.cpp \
     $CORE_SRC_DIR/base_types/Index.cpp \
+    $CORE_SRC_DIR/base_types/Char.cpp \
     $CORE_SRC_DIR/data_structures/String.cpp \
     $CORE_SRC_DIR/filesystem/FileSystemPath.cpp \
     $CORE_SRC_DIR/logging/Logger.cpp \