initial code for dumping imessages in a reasonable format

dump-imessages/iphone-dataprotection/ramdisk_tools/AppleEffaceableStorage.c

@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include "AppleEffaceableStorage.h"
+#include "IOKit.h"
+
+int AppleEffaceableStorage__getLocker(uint32_t lockerId, uint8_t* buffer, size_t len) {
+    uint64_t outScalar = 0;
+    uint32_t one = 1;
+    uint64_t inScalar = lockerId;
+
+    return IOKit_call("AppleEffaceableStorage", 
+               kAppleEffaceableStorageGetLocker,
+               &inScalar,
+               1,
+               NULL,
+               0,
+               &outScalar,
+               &one,
+               buffer,
+               &len);
+}
+
+int AppleEffaceableStorage__getBytes(uint8_t* buffer, size_t len) 
+{
+    const uint64_t offset = 0;
+
+    return IOKit_call("AppleEffaceableStorage",
+                      kAppleEffaceableStorageGetBytes,
+                      &offset,
+                      1,
+                      NULL,
+                      0,
+                      NULL,
+                      NULL,
+                      buffer,
+                      &len);
+}
+
+
+int AppleEffaceableStorage__getLockerFromBytes(uint32_t tag, uint8_t* lockers, size_t lockers_len, uint8_t* buffer, size_t len)
+{
+    struct EffaceableLocker* p = (struct EffaceableLocker*) lockers;
+    unsigned int i=0;
+    
+    while (i < lockers_len)
+    {
+        //printf("p->magic=%x\n", p->magic);
+        if (p->magic != 'Lk') //0x4c6B
+            break;
+        if (p->len == 0 || ((i+8+p->len) > lockers_len))
+            break;
+        //printf("p->tag=%x\n", p->tag);
+        if ((p->tag & ~0x80000000) ==  tag)
+        {
+            len = len < p->len ? len : p->len;
+            memcpy(buffer, p->data, len);
+            return 0;
+        }
+        i = i + 8 + p->len;
+        p = (struct EffaceableLocker*) (&lockers[i]);   
+    }
+    return -1;
+
+}