1 files changed, 210 insertions, 0 deletions
diff --git a/vendor/github.com/minio/minio-go/v7/checksum.go b/vendor/github.com/minio/minio-go/v7/checksum.go
new file mode 100644
index 000000000..a1f6f434f
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/v7/checksum.go
@@ -0,0 +1,210 @@
+/*
+ * MinIO Go Library for Amazon S3 Compatible Cloud Storage
+ * Copyright 2015-2023 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package minio
+
+import (
+	"crypto/sha1"
+	"crypto/sha256"
+	"encoding/base64"
+	"hash"
+	"hash/crc32"
+	"io"
+	"math/bits"
+)
+
+// ChecksumType contains information about the checksum type.
+type ChecksumType uint32
+
+const (
+
+	// ChecksumSHA256 indicates a SHA256 checksum.
+	ChecksumSHA256 ChecksumType = 1 << iota
+	// ChecksumSHA1 indicates a SHA-1 checksum.
+	ChecksumSHA1
+	// ChecksumCRC32 indicates a CRC32 checksum with IEEE table.
+	ChecksumCRC32
+	// ChecksumCRC32C indicates a CRC32 checksum with Castagnoli table.
+	ChecksumCRC32C
+
+	// Keep after all valid checksums
+	checksumLast
+
+	// checksumMask is a mask for valid checksum types.
+	checksumMask = checksumLast - 1
+
+	// ChecksumNone indicates no checksum.
+	ChecksumNone ChecksumType = 0
+
+	amzChecksumAlgo   = "x-amz-checksum-algorithm"
+	amzChecksumCRC32  = "x-amz-checksum-crc32"
+	amzChecksumCRC32C = "x-amz-checksum-crc32c"
+	amzChecksumSHA1   = "x-amz-checksum-sha1"
+	amzChecksumSHA256 = "x-amz-checksum-sha256"
+)
+
+// Is returns if c is all of t.
+func (c ChecksumType) Is(t ChecksumType) bool {
+	return c&t == t
+}
+
+// Key returns the header key.
+// returns empty string if invalid or none.
+func (c ChecksumType) Key() string {
+	switch c & checksumMask {
+	case ChecksumCRC32:
+		return amzChecksumCRC32
+	case ChecksumCRC32C:
+		return amzChecksumCRC32C
+	case ChecksumSHA1:
+		return amzChecksumSHA1
+	case ChecksumSHA256:
+		return amzChecksumSHA256
+	}
+	return ""
+}
+
+// RawByteLen returns the size of the un-encoded checksum.
+func (c ChecksumType) RawByteLen() int {
+	switch c & checksumMask {
+	case ChecksumCRC32, ChecksumCRC32C:
+		return 4
+	case ChecksumSHA1:
+		return sha1.Size
+	case ChecksumSHA256:
+		return sha256.Size
+	}
+	return 0
+}
+
+// Hasher returns a hasher corresponding to the checksum type.
+// Returns nil if no checksum.
+func (c ChecksumType) Hasher() hash.Hash {
+	switch c & checksumMask {
+	case ChecksumCRC32:
+		return crc32.NewIEEE()
+	case ChecksumCRC32C:
+		return crc32.New(crc32.MakeTable(crc32.Castagnoli))
+	case ChecksumSHA1:
+		return sha1.New()
+	case ChecksumSHA256:
+		return sha256.New()
+	}
+	return nil
+}
+
+// IsSet returns whether the type is valid and known.
+func (c ChecksumType) IsSet() bool {
+	return bits.OnesCount32(uint32(c)) == 1
+}
+
+// String returns the type as a string.
+// CRC32, CRC32C, SHA1, and SHA256 for valid values.
+// Empty string for unset and "<invalid>" if not valid.
+func (c ChecksumType) String() string {
+	switch c & checksumMask {
+	case ChecksumCRC32:
+		return "CRC32"
+	case ChecksumCRC32C:
+		return "CRC32C"
+	case ChecksumSHA1:
+		return "SHA1"
+	case ChecksumSHA256:
+		return "SHA256"
+	case ChecksumNone:
+		return ""
+	}
+	return "<invalid>"
+}
+
+// ChecksumReader reads all of r and returns a checksum of type c.
+// Returns any error that may have occurred while reading.
+func (c ChecksumType) ChecksumReader(r io.Reader) (Checksum, error) {
+	h := c.Hasher()
+	if h == nil {
+		return Checksum{}, nil
+	}
+	_, err := io.Copy(h, r)
+	if err != nil {
+		return Checksum{}, err
+	}
+	return NewChecksum(c, h.Sum(nil)), nil
+}
+
+// ChecksumBytes returns a checksum of the content b with type c.
+func (c ChecksumType) ChecksumBytes(b []byte) Checksum {
+	h := c.Hasher()
+	if h == nil {
+		return Checksum{}
+	}
+	n, err := h.Write(b)
+	if err != nil || n != len(b) {
+		// Shouldn't happen with these checksummers.
+		return Checksum{}
+	}
+	return NewChecksum(c, h.Sum(nil))
+}
+
+// Checksum is a type and encoded value.
+type Checksum struct {
+	Type ChecksumType
+	r    []byte
+}
+
+// NewChecksum sets the checksum to the value of b,
+// which is the raw hash output.
+// If the length of c does not match t.RawByteLen,
+// a checksum with ChecksumNone is returned.
+func NewChecksum(t ChecksumType, b []byte) Checksum {
+	if t.IsSet() && len(b) == t.RawByteLen() {
+		return Checksum{Type: t, r: b}
+	}
+	return Checksum{}
+}
+
+// NewChecksumString sets the checksum to the value of s,
+// which is the base 64 encoded raw hash output.
+// If the length of c does not match t.RawByteLen, it is not added.
+func NewChecksumString(t ChecksumType, s string) Checksum {
+	b, _ := base64.StdEncoding.DecodeString(s)
+	if t.IsSet() && len(b) == t.RawByteLen() {
+		return Checksum{Type: t, r: b}
+	}
+	return Checksum{}
+}
+
+// IsSet returns whether the checksum is valid and known.
+func (c Checksum) IsSet() bool {
+	return c.Type.IsSet() && len(c.r) == c.Type.RawByteLen()
+}
+
+// Encoded returns the encoded value.
+// Returns the empty string if not set or valid.
+func (c Checksum) Encoded() string {
+	if !c.IsSet() {
+		return ""
+	}
+	return base64.StdEncoding.EncodeToString(c.r)
+}
+
+// Raw returns the raw checksum value if set.
+func (c Checksum) Raw() []byte {
+	if !c.IsSet() {
+		return nil
+	}
+	return c.r
+}