From d0a18ccd8eea3bdabc76d6dc5420af1ea30aae9f Mon Sep 17 00:00:00 2001
From: Máximo Cuadros <mcuadros@gmail.com>
Date: Fri, 23 Oct 2015 14:28:49 +0200
Subject: formats/packfile: type Hash instead of strings

---
 packfile/delta.go | 93 -------------------------------------------------------
 1 file changed, 93 deletions(-)
 delete mode 100644 packfile/delta.go

(limited to 'packfile/delta.go')

diff --git a/packfile/delta.go b/packfile/delta.go
deleted file mode 100644
index 86b556f..0000000
--- a/packfile/delta.go
+++ /dev/null
@@ -1,93 +0,0 @@
-package packfile
-
-const delta_size_min = 4
-
-func deltaHeaderSize(b []byte) (uint, []byte) {
-	var size, j uint
-	var cmd byte
-	for {
-		cmd = b[j]
-		size |= (uint(cmd) & 0x7f) << (j * 7)
-		j++
-		if uint(cmd)&0xb80 == 0 || j == uint(len(b)) {
-			break
-		}
-	}
-	return size, b[j:]
-}
-
-func PatchDelta(src, delta []byte) []byte {
-	if len(delta) < delta_size_min {
-		return nil
-	}
-	size, delta := deltaHeaderSize(delta)
-	if size != uint(len(src)) {
-		return nil
-	}
-	size, delta = deltaHeaderSize(delta)
-	origSize := size
-
-	dest := make([]byte, 0)
-
-	// var offset uint
-	var cmd byte
-	for {
-		cmd = delta[0]
-		delta = delta[1:]
-		if (cmd & 0x80) != 0 {
-			var cp_off, cp_size uint
-			if (cmd & 0x01) != 0 {
-				cp_off = uint(delta[0])
-				delta = delta[1:]
-			}
-			if (cmd & 0x02) != 0 {
-				cp_off |= uint(delta[0]) << 8
-				delta = delta[1:]
-			}
-			if (cmd & 0x04) != 0 {
-				cp_off |= uint(delta[0]) << 16
-				delta = delta[1:]
-			}
-			if (cmd & 0x08) != 0 {
-				cp_off |= uint(delta[0]) << 24
-				delta = delta[1:]
-			}
-
-			if (cmd & 0x10) != 0 {
-				cp_size = uint(delta[0])
-				delta = delta[1:]
-			}
-			if (cmd & 0x20) != 0 {
-				cp_size |= uint(delta[0]) << 8
-				delta = delta[1:]
-			}
-			if (cmd & 0x40) != 0 {
-				cp_size |= uint(delta[0]) << 16
-				delta = delta[1:]
-			}
-			if cp_size == 0 {
-				cp_size = 0x10000
-			}
-			if cp_off+cp_size < cp_off ||
-				cp_off+cp_size > uint(len(src)) ||
-				cp_size > origSize {
-				break
-			}
-			dest = append(dest, src[cp_off:cp_off+cp_size]...)
-			size -= cp_size
-		} else if cmd != 0 {
-			if uint(cmd) > origSize {
-				break
-			}
-			dest = append(dest, delta[0:uint(cmd)]...)
-			size -= uint(cmd)
-			delta = delta[uint(cmd):]
-		} else {
-			return nil
-		}
-		if size <= 0 {
-			break
-		}
-	}
-	return dest
-}
-- 
cgit