Began inevetable rewrite.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/io.h b/src/io.h
new file mode 100644
index 0000000..f07a421
--- /dev/null
+++ b/src/io.h
@@ -0,0 +1,57 @@
+/* io.h -- Code for file and memory I/O.
+
+   Copyright (C) 2017 Jakob Tsar-Fox, All Rights Reserved.
+
+   This file is part of Nekopack.
+
+   Nekopack is free software: you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation, either version 3 of the License, or (at
+   your option) any later version.
+
+   Nekopack is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Nekopack. If not, see <http://www.gnu.org/licenses/>. */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+
+/* Internal enumerable type for representing the location of a memory
+   segment. Used for freeing and unmapping purposes, if necessary. */
+enum _location {
+    HEAP,
+}
+
+/* Structure to emulate a stream of data that maintains a current
+   position. The structure additionally maintains a `length` variable
+   containing the stream's length. */
+struct stream {
+    size_t         len; /* Length of the stream. */
+    void           *_start; /* Pointer to the stream's start. */
+    void           *_cur; /* Pointer to the current position. */
+    enum _location _loc; /* Location of the stream in memory. */
+}
+
+/* Allocates `len` bytes of memory and returns a new stream pointing to
+   it. The memory provided has not zeroed. */
+struct stream *stream_new(size_t len);
+
+/* Called to free or unmap the memory chunk associated with the given
+   stream, as well as the stream structure itself. */
+void stream_free(struct stream *s);
+
+
+/* Copies `n` bytes from the given stream into the memory area specified
+   by `dest`. The stream is advanced appropriately. */
+void stream_read(void *dest, struct stream *s, size_t n);
+
+
+/* Copies `n` bytes into the given stream from the memory area specified
+   by `src`. The stream is advanced appropriately. */
+void stream_write(struct stream *s, void *src, size_t n);