add: read files into memory

2 files changed, 74 insertions, 0 deletions

diff --git a/src/io/file.c b/src/io/file.c
new file mode 100644
index 0000000..8ce8eef
--- /dev/null
+++ b/src/io/file.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "io/file.h"
+
+bool read_file(const char* path, struct File* out)
+{
+	FILE* stream = fopen(path, "rb");
+	if (stream == NULL)
+	{
+		fprintf(stderr, "error: could not open '%s'\n", path);
+		return false;
+	}
+
+	if (fseek(stream, 0, SEEK_END) != 0)
+	{
+		fprintf(stderr, "error: could not read '%s'\n", path);
+		fclose(stream);
+		return false;
+	}
+
+	long length = ftell(stream);
+	if (length < 0)
+	{
+		fprintf(stderr, "error: could not read '%s'\n", path);
+		fclose(stream);
+		return false;
+	}
+	rewind(stream);
+
+	size_t size = (size_t)length;
+	char* data = malloc(size + 1);
+	if (data == NULL)
+	{
+		fprintf(stderr, "error: out of memory reading '%s'\n", path);
+		fclose(stream);
+		return false;
+	}
+
+	if (fread(data, 1, size, stream) != size)
+	{
+		fprintf(stderr, "error: could not read '%s'\n", path);
+		free(data);
+		fclose(stream);
+		return false;
+	}
+
+	data[size] = '\0';
+	fclose(stream);
+
+	out->data = data;
+	out->size = size;
+	return true;
+}
+
+void free_file(struct File* file)
+{
+	free(file->data);
+	file->data = NULL;
+	file->size = 0;
+}
diff --git a/src/io/file.h b/src/io/file.h
new file mode 100644
index 0000000..7d15bd0
--- /dev/null
+++ b/src/io/file.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdbool.h>
+
+struct File
+{
+	char* data;
+	size_t size;
+};
+
+bool read_file(const char* path, struct File* out);
+void free_file(struct File* file);