diff --git a/sysmodules/loader/source/ifile.c b/sysmodules/loader/source/ifile.c
index c7052ad..10418f5 100644
--- a/sysmodules/loader/source/ifile.c
+++ b/sysmodules/loader/source/ifile.c
@@ -11,6 +11,16 @@ Result IFile_Open(IFile *file, FS_ArchiveID archiveId, FS_Path archivePath, FS_P
   return res;
 }
 
+Result IFile_OpenFromArchive(IFile *file, FS_Archive archive, FS_Path filePath, u32 flags)
+{
+  Result res;
+
+  res = FSUSER_OpenFile(&file->handle, archive, filePath, flags, 0);
+  file->pos = 0;
+  file->size = 0;
+  return res;
+}
+
 Result IFile_Close(IFile *file)
 {
   return FSFILE_Close(file->handle);
@@ -21,7 +31,16 @@ Result IFile_GetSize(IFile *file, u64 *size)
   Result res;
 
   res = FSFILE_GetSize(file->handle, size);
-  file->size = *size;
+  if (R_SUCCEEDED(res)) file->size = *size;
+  return res;
+}
+
+Result IFile_SetSize(IFile *file, u64 size)
+{
+  Result res;
+
+  res = FSFILE_SetSize(file->handle, size);
+  if (R_SUCCEEDED(res)) file->size = size;
   return res;
 }
 
@@ -45,7 +64,7 @@ Result IFile_Read(IFile *file, u64 *total, void *buffer, u32 len)
   while (1)
   {
     res = FSFILE_Read(file->handle, &read, file->pos, buf, left);
-    if (R_FAILED(res))
+    if (R_FAILED(res) || read == 0)
     {
       break;
     }
@@ -63,3 +82,42 @@ Result IFile_Read(IFile *file, u64 *total, void *buffer, u32 len)
   *total = cur;
   return res;
 }
+
+Result IFile_Write(IFile *file, u64 *total, const void *buffer, u32 len, u32 flags)
+{
+  u32 written;
+  u32 left;
+  char *buf;
+  u64 cur;
+  Result res;
+
+  if (len == 0)
+  {
+    *total = 0;
+    return 0;
+  }
+
+  buf = (char *)buffer;
+  cur = 0;
+  left = len;
+  while (1)
+  {
+    res = FSFILE_Write(file->handle, &written, file->pos, buf, left, flags);
+    if (R_FAILED(res))
+    {
+      break;
+    }
+
+    cur += written;
+    file->pos += written;
+    if (written == left)
+    {
+      break;
+    }
+    buf += written;
+    left -= written;
+  }
+
+  *total = cur;
+  return res;
+}
diff --git a/sysmodules/loader/source/ifile.h b/sysmodules/loader/source/ifile.h
index f939547..e184777 100644
--- a/sysmodules/loader/source/ifile.h
+++ b/sysmodules/loader/source/ifile.h
@@ -2,14 +2,19 @@
 
 #include <3ds/types.h>
 
+#define PATH_MAX 255
+
 typedef struct
 {
-  Handle handle;
-  u64 pos;
-  u64 size;
+    Handle handle;
+    u64 pos;
+    u64 size;
 } IFile;
 
 Result IFile_Open(IFile *file, FS_ArchiveID archiveId, FS_Path archivePath, FS_Path filePath, u32 flags);
+Result IFile_OpenFromArchive(IFile *file, FS_Archive archive, FS_Path filePath, u32 flags);
 Result IFile_Close(IFile *file);
 Result IFile_GetSize(IFile *file, u64 *size);
-Result IFile_Read(IFile *file, u64 *total, void *buffer, u32 len);
\ No newline at end of file
+Result IFile_SetSize(IFile *file, u64 size);
+Result IFile_Read(IFile *file, u64 *total, void *buffer, u32 len);
+Result IFile_Write(IFile *file, u64 *total, const void *buffer, u32 len, u32 flags);
diff --git a/sysmodules/rosalina/include/ifile.h b/sysmodules/rosalina/include/ifile.h
index 4683a12..515296b 100644
--- a/sysmodules/rosalina/include/ifile.h
+++ b/sysmodules/rosalina/include/ifile.h
@@ -41,5 +41,6 @@ Result IFile_Open(IFile *file, FS_ArchiveID archiveId, FS_Path archivePath, FS_P
 Result IFile_OpenFromArchive(IFile *file, FS_Archive archive, FS_Path filePath, u32 flags);
 Result IFile_Close(IFile *file);
 Result IFile_GetSize(IFile *file, u64 *size);
+Result IFile_SetSize(IFile *file, u64 size);
 Result IFile_Read(IFile *file, u64 *total, void *buffer, u32 len);
-Result IFile_Write(IFile *file, u64 *total, void *buffer, u32 len, u32 flags);
+Result IFile_Write(IFile *file, u64 *total, const void *buffer, u32 len, u32 flags);
diff --git a/sysmodules/rosalina/include/process_patches.h b/sysmodules/rosalina/include/process_patches.h
index 4ecec3c..2bd0e9c 100644
--- a/sysmodules/rosalina/include/process_patches.h
+++ b/sysmodules/rosalina/include/process_patches.h
@@ -29,5 +29,7 @@
 #include <3ds/types.h>
 #include "menu.h"
 
+typedef Result(* OperateOnProcessCb)(Handle processHandle, u32 textSz, u32 roSz, u32 rwSz);
+
 Result OpenProcessByName(const char *name, Handle *h);
-Result PatchProcessByName(const char *name, Result (*func)(u32 size));
+Result OperateOnProcessByName(const char *name, OperateOnProcessCb func); // doesn't operate on the heap
diff --git a/sysmodules/rosalina/source/ifile.c b/sysmodules/rosalina/source/ifile.c
index 7ede5c4..515fa91 100644
--- a/sysmodules/rosalina/source/ifile.c
+++ b/sysmodules/rosalina/source/ifile.c
@@ -57,7 +57,16 @@ Result IFile_GetSize(IFile *file, u64 *size)
   Result res;
 
   res = FSFILE_GetSize(file->handle, size);
-  file->size = *size;
+  if (R_SUCCEEDED(res)) file->size = *size;
+  return res;
+}
+
+Result IFile_SetSize(IFile *file, u64 size)
+{
+  Result res;
+
+  res = FSFILE_SetSize(file->handle, size);
+  if (R_SUCCEEDED(res)) file->size = size;
   return res;
 }
 
@@ -100,7 +109,7 @@ Result IFile_Read(IFile *file, u64 *total, void *buffer, u32 len)
   return res;
 }
 
-Result IFile_Write(IFile *file, u64 *total, void *buffer, u32 len, u32 flags)
+Result IFile_Write(IFile *file, u64 *total, const void *buffer, u32 len, u32 flags)
 {
   u32 written;
   u32 left;
diff --git a/sysmodules/rosalina/source/process_patches.c b/sysmodules/rosalina/source/process_patches.c
index 8ba7843..77191eb 100644
--- a/sysmodules/rosalina/source/process_patches.c
+++ b/sysmodules/rosalina/source/process_patches.c
@@ -59,20 +59,32 @@ Result OpenProcessByName(const char *name, Handle *h)
     return 0;
 }
 
-Result PatchProcessByName(const char *name, Result (*func)(u32 size))
+Result OperateOnProcessByName(const char *name, OperateOnProcessCb func)
 {
     Result res;
     Handle processHandle;
-    OpenProcessByName(name, &processHandle);
+    res = OpenProcessByName(name, &processHandle);
 
-    s64 textTotalRoundedSize = 0, startAddress = 0;
-    svcGetProcessInfo(&textTotalRoundedSize, processHandle, 0x10002); // only patch .text
-    svcGetProcessInfo(&startAddress, processHandle, 0x10005);
-    if(R_FAILED(res = svcMapProcessMemoryEx(processHandle, 0x00100000, (u32) startAddress, textTotalRoundedSize)))
+    if (R_FAILED(res))
         return res;
 
-    res = func(textTotalRoundedSize);
+    s64 startAddress, textSize, roSize, rwSize;
 
-    svcUnmapProcessMemoryEx(processHandle, 0x00100000, textTotalRoundedSize);
+    svcGetProcessInfo(&textSize, processHandle, 0x10002); // rounded sizes
+    svcGetProcessInfo(&roSize, processHandle, 0x10003);
+    svcGetProcessInfo(&rwSize, processHandle, 0x10004); // data and bss
+    svcGetProcessInfo(&startAddress, processHandle, 0x10005);
+
+    // NOTE: we suppose .text, .rodata, .data+.bss are contiguous & in that order
+    u32 totalSize = (u32)(textSize + roSize + rwSize);
+    if (R_FAILED(res = svcMapProcessMemoryEx(processHandle, 0x00100000, (u32) startAddress, totalSize)))
+    {
+        svcCloseHandle(processHandle);
+        return res;
+    }
+
+    res = func(processHandle, (u32)textSize, (u32)roSize, (u32)rwSize);
+
+    svcUnmapProcessMemoryEx(processHandle, 0x00100000, totalSize);
     return res;
 }