From ebb4cc5b97b8565ceffa0d48301f8af9e6b884df Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Fri, 22 Aug 2025 00:35:21 +0200
Subject: piece-table: Take original buffer from outside

---
 src/piece-table.c | 60 +++++++++++++++++--------------------------------------
 1 file changed, 18 insertions(+), 42 deletions(-)

(limited to 'src/piece-table.c')

diff --git a/src/piece-table.c b/src/piece-table.c
index 24e3671..070d265 100644
--- a/src/piece-table.c
+++ b/src/piece-table.c
@@ -91,7 +91,6 @@ piece_table_piece_new (piece_table *pt)
       pt->empty = pt->empty->next;
       return p;
     }
-  /* TODO: Resize if needed */
   return piece_buffer_bump (pt->pieces);
 }
 
@@ -102,7 +101,7 @@ piece_table_piece_split (piece_table *pt, piece *p, size_t pos)
   /* Returns the first piece */
   piece *second;
   assert (pos < p->length);
-  assert (p->buffer != NULL); /* Not a sentinel piece */
+  assert (p->type != PIECE_SENTINEL); /* Not a sentinel piece */
   assert (p->length != 0);    /* Not an empty piece (they should not exist) */
   if ( pos == 0 )
     {
@@ -116,7 +115,7 @@ piece_table_piece_split (piece_table *pt, piece *p, size_t pos)
   p->next = second;
   second->prev = p;
   second->start = p->start + pos;
-  second->buffer = p->buffer;
+  second->type = p->type;
   return p;
 }
 
@@ -165,7 +164,7 @@ piece_table_insert (piece_table *pt, size_t pos, char *in, size_t len)
   assert ( pos <= pt->length );
   assert ( len > 0 );
 
-  for (i = 0; i<len; i++)
+  for (i=0; i<len; i++)
     {
       text_buffer_append (&pt->add, in[i]);
     }
@@ -202,7 +201,7 @@ piece_table_insert (piece_table *pt, size_t pos, char *in, size_t len)
    * Add in the end of the buffer, and the end of the piece: enlarge
    */
   if ( pt->add.used != 0 &&
-       start->buffer == &pt->add &&
+       start->type == PIECE_ADD &&
        pt->cached_offset + start->length == pos &&
        pt->add.used == start->start + start->length + len ) {
       pt->length += len;
@@ -213,7 +212,7 @@ piece_table_insert (piece_table *pt, size_t pos, char *in, size_t len)
 
   /* Make a new piece and insert it */
   new = piece_table_piece_new (pt);
-  new->buffer = &pt->add;
+  new->type = PIECE_ADD;
   new->start = pt->add.used - len;
   new->length = len;
 
@@ -284,8 +283,7 @@ piece_table_create_from_str (char *orig, size_t size)
   pt->length = size;
 
   /* Original buffer */
-  text_buffer_init (&pt->orig);
-  text_buffer_fill (&pt->orig, orig, size);
+  pt->orig = orig;
 
   /* Add buffer */
   text_buffer_init (&pt->add);
@@ -294,7 +292,7 @@ piece_table_create_from_str (char *orig, size_t size)
 
   pt->sentinel = piece_buffer_bump (pt->pieces);
   original = piece_buffer_bump (pt->pieces);
-  original->buffer = &pt->orig;
+  original->type = PIECE_ORIG;
   original->start = 0;
   original->length = pt->length;
   original->next = pt->sentinel;
@@ -317,7 +315,6 @@ piece_table_create (char *orig, size_t size)
 void
 piece_table_destroy (piece_table *pt)
 {
-  text_buffer_clear (&pt->orig);
   text_buffer_clear (&pt->add);
   piece_buffer_destroy (pt->pieces);
   free (pt);
@@ -328,8 +325,17 @@ piece_table_index (piece_table *pt, size_t pos)
 {
   assert (pos < pt->length);
   piece_table_piece_find (pt, pos);
-  return text_buffer_index (pt->cached->buffer,
-                           pt->cached->start + pos - pt->cached_offset);
+  switch (pt->cached->type)
+    {
+    case PIECE_ORIG:
+      return pt->orig[pt->cached->start + pos - pt->cached_offset];
+    case PIECE_ADD:
+      return text_buffer_index (&pt->add,
+                                pt->cached->start + pos - pt->cached_offset);
+    default:
+      assert (0 && "UNREACHABLE: indexing the sentinel piece");
+      break;
+    }
 }
 
 void
@@ -348,33 +354,3 @@ piece_table_length (piece_table *pt)
 {
   return pt->length;
 }
-
-void
-piece_table_optimize (piece_table *pt)
-{
-  piece *p;
-  char *buff = malloc (sizeof (*buff) * pt->length + 1); /*TODO remove +1*/
-  piece_table_to_string (pt, buff, pt->length);
-  text_buffer_fill (&pt->orig, buff, pt->length);
-  free (buff);
-  text_buffer_clear (&pt->add);
-  text_buffer_init (&pt->add);
-
-  piece_buffer_empty (pt->pieces);
-
-  pt->sentinel = piece_buffer_bump (pt->pieces);
-  p = piece_buffer_bump (pt->pieces);
-  pt->empty = NULL;
-
-  p->next = pt->sentinel;
-  p->prev = pt->sentinel;
-  pt->sentinel->prev = p;
-  pt->sentinel->next = p;
-
-  p->start = 0;
-  p->length = pt->length;
-  p->buffer = &pt->orig;
-
-  pt->cached_offset = 0;
-  pt->cached = p;
-}
-- 
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