Fill in this one.

nbio/nbio_stdio.c

@@ -0,0 +1,87 @@
+#include "nbio.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+struct nbio_t {
+	FILE* f;
+	void* data;
+	size_t progress;
+	size_t len;
+	char op;
+};
+
+static const char * modes[]={ "rb", "wb", "r+b" };
+struct nbio_t* nbio_open(const char * filename, enum nbio_mode_t mode)
+{
+	FILE* f=fopen(filename, modes[mode]);
+	if (!f) return NULL;
+	
+	struct nbio_t* handle=(struct nbio_t*)malloc(sizeof(struct nbio_t));
+	handle->f = f;
+	if (mode != NBIO_WRITE)
+	{
+		fseek(handle->f, 0, SEEK_END);
+		handle->len = ftell(handle->f);
+	}
+	else handle->len = 0;
+	handle->data = malloc(handle->len);
+	handle->progress = handle->len;
+	handle->op = -1;
+}
+
+void nbio_begin_read(struct nbio_t* handle)
+{
+	handle->op = NBIO_READ;
+	handle->progress = 0;
+}
+
+void nbio_begin_write(struct nbio_t* handle)
+{
+	handle->op = NBIO_WRITE;
+	handle->progress = 0;
+}
+
+bool nbio_iterate(struct nbio_t* handle, size_t* progress, size_t* len)
+{
+	size_t amount = 65536;
+	if (amount > handle->len - handle->progress)
+	{
+		amount = handle->len - handle->progress;
+	}
+	if (handle->op == NBIO_READ)
+	{
+		fread((char*)handle->ptr + handle->progress, 1,amount, handle->f);
+	}
+	if (handle->op == NBIO_WRITE)
+	{
+		fwrite((char*)handle->ptr + handle->progress, 1,amount, handle->f);
+	}
+	handle->progress += amount;
+	if (progress) *progress = handle->progress;
+	if (len) *len = handle->len;
+	if (handle->progress == handle->len) handle->op = -1;
+	return (handle->op == -1);
+}
+
+void nbio_resize(struct nbio_t* handle, size_t len)
+{
+	if (len < handle->len)
+	{
+		puts("ERROR - attempted file shrink operation, not implemented");
+		abort();
+	}
+	handle->len = len;
+}
+
+void* nbio_get_ptr(struct nbio_t* handle, size_t* len)
+{
+	if (len) *len = handle->len;
+	if (handle->op == -1) return handle->data;
+	else return NULL;
+}
+
+void nbio_free(struct nbio_t* handle)
+{
+	fclose(handle->f);
+	free(handle->data);
+}