calculate hashes for Lora

add lora hashes to infotext
when pasting infotext, use infotext's lora hashes to find local loras for <lora:xxx:1> entries whose hashes match loras the user has

modules/hashes.py

@@ -46,8 +46,8 @@ def calculate_sha256(filename):
     return hash_sha256.hexdigest()
 
 
-def sha256_from_cache(filename, title):
-    hashes = cache("hashes")
+def sha256_from_cache(filename, title, use_addnet_hash=False):
+    hashes = cache("hashes-addnet") if use_addnet_hash else cache("hashes")
     ondisk_mtime = os.path.getmtime(filename)
 
     if title not in hashes:
@@ -62,10 +62,10 @@ def sha256_from_cache(filename, title):
     return cached_sha256
 
 
-def sha256(filename, title):
-    hashes = cache("hashes")
+def sha256(filename, title, use_addnet_hash=False):
+    hashes = cache("hashes-addnet") if use_addnet_hash else cache("hashes")
 
-    sha256_value = sha256_from_cache(filename, title)
+    sha256_value = sha256_from_cache(filename, title, use_addnet_hash)
     if sha256_value is not None:
         return sha256_value
 
@@ -73,7 +73,11 @@ def sha256(filename, title):
         return None
 
     print(f"Calculating sha256 for {filename}: ", end='')
-    sha256_value = calculate_sha256(filename)
+    if use_addnet_hash:
+        with open(filename, "rb") as file:
+            sha256_value = addnet_hash_safetensors(file)
+    else:
+        sha256_value = calculate_sha256(filename)
     print(f"{sha256_value}")
 
     hashes[title] = {
@@ -86,6 +90,19 @@ def sha256(filename, title):
     return sha256_value
 
 
+def addnet_hash_safetensors(b):
+    """kohya-ss hash for safetensors from https://github.com/kohya-ss/sd-scripts/blob/main/library/train_util.py"""
+    hash_sha256 = hashlib.sha256()
+    blksize = 1024 * 1024
 
+    b.seek(0)
+    header = b.read(8)
+    n = int.from_bytes(header, "little")
 
+    offset = n + 8
+    b.seek(offset)
+    for chunk in iter(lambda: b.read(blksize), b""):
+        hash_sha256.update(chunk)
+
+    return hash_sha256.hexdigest()