From eb210fa16730102f1ab49cad7a1fed5c2c184b6d Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Wed, 18 Dec 2024 18:01:28 +0000
Subject: [PATCH] add binary data structure definitions and image writer
 function prototypes

---
 src/bin.h    | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/status.h | 12 ++++++++++++
 src/write.h  | 22 ++++++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 src/bin.h
 create mode 100644 src/status.h
 create mode 100644 src/write.h

diff --git a/src/bin.h b/src/bin.h
new file mode 100644
index 0000000..ecacf47
--- /dev/null
+++ b/src/bin.h
@@ -0,0 +1,52 @@
+#ifndef BIN_H_
+#define BIN_H_
+
+#include <blue/core/endian.h>
+
+#define EC3_SIGNATURE      0x45433358
+
+#define EC3_VERSION_1_0    0x0100
+
+#define EC3_CLUSTER_16K    0x00u
+#define EC3_CLUSTER_32K    0x01u
+#define EC3_CLUSTER_64K    0x02u
+#define EC3_CLUSTER_128K   0x03u
+#define EC3_CLUSTER_256K   0x04u
+#define EC3_CLUSTER_512K   0x05u
+#define EC3_CLUSTER_1M     0x06u
+
+#define EC3_TAG_VOLU       0x564F4C55
+#define EC3_TAG_CTAB       0x43544142
+#define EC3_TAG_XATR       0x58415452
+#define EC3_TAG_STAB       0x53544142
+#define EC3_TAG_MFST       0x4D465354
+#define EC3_TAG_BLOB       0x424C4F42
+#define EC3_TAG_EXEC       0x45584543
+#define EC3_TAG_CERT       0x43455254
+#define EC3_TAG_CSIG       0x43534947
+
+#define EC3_TAG_SIGNED     0x00000001u
+#define EC3_TAG_COMPRESSED 0x00000002u
+#define EC3_TAG_ENCRYPTED  0x00000004u
+
+struct ec3_header {
+	b_i32 h_sig;
+	b_i16 h_version;
+	b_i16 h_cluster_size;
+	b_i64 h_tag_table_offset;
+	b_i64 h_tag_count;
+	b_i64 h_app_magic;
+};
+
+struct ec3_tag_table_entry {
+	b_i32 tag_type;
+	b_i32 tag_flags;
+	b_i32 tag_checksum;
+	b_i32 tag_reserved1;
+	b_i64 tag_ident;
+	b_i64 tag_offset;
+	b_i64 tag_size;
+	b_i64 tag_reserved2;
+};
+
+#endif
diff --git a/src/status.h b/src/status.h
new file mode 100644
index 0000000..0f0a72c
--- /dev/null
+++ b/src/status.h
@@ -0,0 +1,12 @@
+#ifndef STATUS_H_
+#define STATUS_H_
+
+enum ec3_status {
+	EC3_SUCCESS = 0,
+	EC3_ERR_NO_MEMORY,
+	EC3_ERR_NO_ENTRY,
+	EC3_ERR_NOT_SUPPORTED,
+	EC3_ERR_BAD_STATE,
+};
+
+#endif
diff --git a/src/write.h b/src/write.h
new file mode 100644
index 0000000..cda7dcb
--- /dev/null
+++ b/src/write.h
@@ -0,0 +1,22 @@
+#ifndef WRITE_H_
+#define WRITE_H_
+
+#include "status.h"
+
+#include <stdint.h>
+#include <stdio.h>
+
+struct ec3_writer;
+struct ec3_tag_writer;
+
+extern enum ec3_status ec3_writer_create(void);
+extern void ec3_writer_destroy(struct ec3_writer *w);
+extern void ec3_writer_write_image(struct ec3_writer *w, FILE *fp);
+
+extern enum ec3_status ec3_writer_create_tag(
+	struct ec3_writer *w,
+	uint32_t tag_type,
+	uint64_t tag_ident,
+	struct ec3_tag_writer **out_writer);
+
+#endif