From 20e247e31fb40bf2228a2ed84b93896fc48b5eff Mon Sep 17 00:00:00 2001
From: Jacob McDonnell <jacob@jacobmcdonnell.com>
Date: Sat, 4 Apr 2026 17:41:01 -0400
Subject: feat: Producing a Readable MAT-File

Producing a readable MAT-File of a 1x5 Array of doubles. The file is
somewhat manually generated, but currently works.
---
 include/matfile.h | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 include/matfile.h

(limited to 'include/matfile.h')

diff --git a/include/matfile.h b/include/matfile.h
new file mode 100644
index 0000000..586dbea
--- /dev/null
+++ b/include/matfile.h
@@ -0,0 +1,92 @@
+#ifndef INCLUDE_MATFILE_H_
+#define INCLUDE_MATFILE_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+typedef enum {
+    miINT8 = 1,
+    miUINT8 = 2,
+    miINT16 = 3,
+    miUINT16 = 4,
+    miINT32 = 5,
+    miUINT32 = 6,
+    miSINGLE = 7,
+    // 8 -- Reserved
+    miDOUBLE = 9,
+    // 10 -- Reserved
+    // 11 -- Reserved
+    miINT64 = 12,
+    miUINT64 = 13,
+    miMATRIX = 14,
+    miCOMPRESSED = 15,
+    miUTF8 = 16,
+    miUTF16 = 17,
+    miUTF32 = 18
+} mTypes_t;
+
+typedef enum {
+    mxCELL_CLASS = 1,
+    mxSTRUCT_CLASS = 2,
+    mxOBJECT_CLASS = 3,
+    mxCHAR_CLASS = 4,
+    mxSPARSE_CLASS = 5,
+    mxDOUBLE_CLASS = 6,
+    mxSINGLE_CLASS = 7,
+    mxINT8_CLASS = 8,
+    mxUINT8_CLASS = 9,
+    mxINT16_CLASS = 10,
+    mxUINT16_CLASS = 11,
+    mxINT32_CLASS = 12,
+    mxUINT32_CLASS = 13,
+    mxINT64_CLASS = 14,
+    mxUINT64_CLASS = 15,
+} mClasses_t;
+
+typedef struct {
+    char  description[116];
+    uint32_t subsystem_offset_high;
+    uint32_t subsystem_offset_low;
+    uint16_t version;
+    uint16_t endian_indicator;
+} mHeader_t;
+
+typedef struct {
+	uint32_t type;
+	uint32_t size;
+} mTag_t;
+
+typedef struct {
+	uint16_t type;
+	uint16_t size;
+} mSmallTag_t;
+
+typedef struct {
+	mTag_t tag;
+	void *data;
+} mData_t;
+
+typedef struct {
+	mSmallTag_t tag;
+	uint32_t    data;
+} mSmallData_t;
+
+typedef struct {
+	uint8_t class;
+	struct {
+		uint8_t unused1 : 1;
+		uint8_t logical : 1;
+		uint8_t global : 1;
+		uint8_t complex : 1;
+		uint8_t unused2 : 4;
+	};
+	uint16_t unused3;
+	uint32_t unused0;
+} mArrayFlags_t;
+
+bool write_header(FILE *file);
+bool write_data(FILE *file, mData_t data);
+bool write_small_data(FILE *file, mSmallData_t data);
+
+#endif  // INCLUDE_MATFILE_H_
-- 
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