refactor: replace gitdiff with external package

1 files changed, 0 insertions, 91 deletions

diff --git a/internal/gitdiff/base85.go b/internal/gitdiff/base85.go
deleted file mode 100644
index 86db117..0000000
--- a/internal/gitdiff/base85.go
+++ /dev/null
@@ -1,91 +0,0 @@
-package gitdiff
-
-import (
-	"fmt"
-)
-
-var (
-	b85Table map[byte]byte
-	b85Alpha = []byte(
-		"0123456789" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "!#$%&()*+-;<=>?@^_`{|}~",
-	)
-)
-
-func init() {
-	b85Table = make(map[byte]byte)
-	for i, c := range b85Alpha {
-		b85Table[c] = byte(i)
-	}
-}
-
-// base85Decode decodes Base85-encoded data from src into dst. It uses the
-// alphabet defined by base85.c in the Git source tree. src must contain at
-// least len(dst) bytes of encoded data.
-func base85Decode(dst, src []byte) error {
-	var v uint32
-	var n, ndst int
-	for i, b := range src {
-		if b, ok := b85Table[b]; ok {
-			v = 85*v + uint32(b)
-			n++
-		} else {
-			return fmt.Errorf("invalid base85 byte at index %d: 0x%X", i, src[i])
-		}
-		if n == 5 {
-			rem := len(dst) - ndst
-			for j := 0; j < 4 && j < rem; j++ {
-				dst[ndst] = byte(v >> 24)
-				ndst++
-				v <<= 8
-			}
-			v = 0
-			n = 0
-		}
-	}
-	if n > 0 {
-		return fmt.Errorf("base85 data terminated by underpadded sequence")
-	}
-	if ndst < len(dst) {
-		return fmt.Errorf("base85 data underrun: %d < %d", ndst, len(dst))
-	}
-	return nil
-}
-
-// base85Encode encodes src in Base85, writing the result to dst. It uses the
-// alphabet defined by base85.c in the Git source tree.
-func base85Encode(dst, src []byte) {
-	var di, si int
-
-	encode := func(v uint32) {
-		dst[di+0] = b85Alpha[(v/(85*85*85*85))%85]
-		dst[di+1] = b85Alpha[(v/(85*85*85))%85]
-		dst[di+2] = b85Alpha[(v/(85*85))%85]
-		dst[di+3] = b85Alpha[(v/85)%85]
-		dst[di+4] = b85Alpha[v%85]
-	}
-
-	n := (len(src) / 4) * 4
-	for si < n {
-		encode(uint32(src[si+0])<<24 | uint32(src[si+1])<<16 | uint32(src[si+2])<<8 | uint32(src[si+3]))
-		si += 4
-		di += 5
-	}
-
-	var v uint32
-	switch len(src) - si {
-	case 3:
-		v |= uint32(src[si+2]) << 8
-		fallthrough
-	case 2:
-		v |= uint32(src[si+1]) << 16
-		fallthrough
-	case 1:
-		v |= uint32(src[si+0]) << 24
-		encode(v)
-	}
-}
-
-// base85Len returns the length of n bytes of Base85 encoded data.
-func base85Len(n int) int {
-	return (n + 3) / 4 * 5
-}