From 7cd20333d642491ff349154b14734152ab147955 Mon Sep 17 00:00:00 2001
From: Jorj Bauer <jorj@jorj.org>
Date: Sun, 28 Jun 2020 08:29:51 -0400
Subject: [PATCH] first pass of compatability functions

---
 filemanager.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/filemanager.h b/filemanager.h
index 25f826d..e64d877 100644
--- a/filemanager.h
+++ b/filemanager.h
@@ -11,6 +11,13 @@
 
 #define FMMAGIC 'F'
 
+#ifndef SEEK_SET
+#define SEEK_SET 0
+#endif
+#ifndef SEEK_CUR
+#define SEEK_CUR 1
+#endif
+
 class FileManager {
  public:
   virtual ~FileManager() {};
@@ -121,6 +128,34 @@ class FileManager {
   virtual bool setSeekPosition(int8_t fd, uint32_t pos) = 0;
   virtual void seekToEnd(int8_t fd) = 0;
 
+  int write(int8_t fd, const void *buf, int nbyte) {
+    uint8_t *p = (uint8_t *)buf;
+    for (int i=0; i<nbyte; i++) {
+      if (!writeByte(fd, p[i]))
+	return -1;
+    }
+    return nbyte;
+  };
+  int read(int8_t fd, void *buf, int nbyte) {
+    uint8_t *p = (uint8_t *)buf;
+    for (int i=0; i<nbyte; i++) {
+      p[i] = readByte(fd); // FIXME: no error handling
+    }
+    return nbyte;
+  };
+  int seek(int8_t fd, int offset, int whence) {
+    if (whence == SEEK_CUR && offset == 0) {
+      return fileSeekPositions[fd];
+    }
+    if (whence == SEEK_SET) {
+      if (!setSeekPosition(fd, offset))
+	return -1;
+      return offset;
+    }
+    // Other cases not supported yet
+    return -1;
+  };
+
  protected:
   unsigned long fileSeekPositions[MAXFILES];
   char cachedNames[MAXFILES][MAXPATH];