feat(sdk): Experimental zipstream lib, add segment-based streaming ZIP writer, ZIP64 modes

sdk/internal/zipstream/crc32combine.go

@@ -0,0 +1,68 @@
+// Experimental: This package is EXPERIMENTAL and may change or be removed at any time
+
+package zipstream
+
+// CRC32CombineIEEE combines two CRC-32 (IEEE) checksums as if the data were concatenated.
+// crc1 is the CRC of the first part, crc2 of the second part, and len2 is the byte length of the second part.
+// This uses the standard reflected IEEE polynomial 0xEDB88320 as used by ZIP.
+func CRC32CombineIEEE(crc1, crc2 uint32, len2 int64) uint32 {
+	if len2 <= 0 {
+		return crc1
+	}
+
+	var even [32]uint32
+	var odd [32]uint32
+
+	// Operator for one zero bit in 'odd'
+	odd[0] = 0xEDB88320 // reflected IEEE polynomial
+	row := uint32(1)
+	for n := 1; n < 32; n++ {
+		odd[n] = row
+		row <<= 1
+	}
+
+	// even = odd^(2), odd = even^(2)
+	gf2MatrixSquare(even[:], odd[:])
+	gf2MatrixSquare(odd[:], even[:])
+
+	// Apply len2 zero bytes to crc1
+	for {
+		gf2MatrixSquare(even[:], odd[:])
+		if (len2 & 1) != 0 {
+			crc1 = gf2MatrixTimes(even[:], crc1)
+		}
+		len2 >>= 1
+		if len2 == 0 {
+			break
+		}
+		gf2MatrixSquare(odd[:], even[:])
+		if (len2 & 1) != 0 {
+			crc1 = gf2MatrixTimes(odd[:], crc1)
+		}
+		len2 >>= 1
+		if len2 == 0 {
+			break
+		}
+	}
+
+	return crc1 ^ crc2
+}
+
+func gf2MatrixTimes(mat []uint32, vec uint32) uint32 {
+	var sum uint32
+	i := 0
+	for vec != 0 {
+		if (vec & 1) != 0 {
+			sum ^= mat[i]
+		}
+		vec >>= 1
+		i++
+	}
+	return sum
+}
+
+func gf2MatrixSquare(square, mat []uint32) {
+	for n := 0; n < 32; n++ {
+		square[n] = gf2MatrixTimes(mat, mat[n])
+	}
+}

sdk/internal/zipstream/crc32combine_test.go

@@ -0,0 +1,89 @@
+// Experimental: This package is EXPERIMENTAL and may change or be removed at any time
+
+package zipstream
+
+import (
+	"hash/crc32"
+	"math/rand"
+	"testing"
+)
+
+func TestCRC32CombineIEEE_Basic(t *testing.T) {
+	rand.Seed(42)
+	a := make([]byte, 1024)
+	b := make([]byte, 2048)
+	rand.Read(a)
+	rand.Read(b)
+
+	crcA := crc32.ChecksumIEEE(a)
+	crcB := crc32.ChecksumIEEE(b)
+	combined := CRC32CombineIEEE(crcA, crcB, int64(len(b)))
+
+	all := append(append([]byte{}, a...), b...)
+	want := crc32.ChecksumIEEE(all)
+
+	if combined != want {
+		t.Fatalf("combined CRC mismatch: got %08x want %08x", combined, want)
+	}
+}
+
+func TestCRC32CombineIEEE_MultiChunks(t *testing.T) {
+	rand.Seed(42)
+	chunks := make([][]byte, 10)
+	for i := range chunks {
+		n := 1 + rand.Intn(8192)
+		chunks[i] = make([]byte, n)
+		rand.Read(chunks[i])
+	}
+
+	// Combine sequentially
+	var total uint32
+	var init bool
+	for _, c := range chunks {
+		crc := crc32.ChecksumIEEE(c)
+		if !init {
+			total = crc
+			init = true
+		} else {
+			total = CRC32CombineIEEE(total, crc, int64(len(c)))
+		}
+	}
+
+	// Compute directly over concatenation
+	var all []byte
+	for _, c := range chunks {
+		all = append(all, c...)
+	}
+	want := crc32.ChecksumIEEE(all)
+
+	if total != want {
+		t.Fatalf("multi-chunk combined CRC mismatch: got %08x want %08x", total, want)
+	}
+}
+
+func TestCRC32CombineIEEE_Associativity(t *testing.T) {
+	a := []byte("alpha")
+	b := []byte("beta")
+	c := []byte("charlie")
+
+	ca := crc32.ChecksumIEEE(a)
+	cb := crc32.ChecksumIEEE(b)
+	cc := crc32.ChecksumIEEE(c)
+
+	left := CRC32CombineIEEE(ca, CRC32CombineIEEE(cb, cc, int64(len(c))), int64(len(b)+len(c)))
+	right := CRC32CombineIEEE(CRC32CombineIEEE(ca, cb, int64(len(b))), cc, int64(len(c)))
+
+	if left != right {
+		t.Fatalf("associativity failed: left %08x right %08x", left, right)
+	}
+}
+
+func TestCRC32CombineIEEE_ZeroLength(t *testing.T) {
+	a := []byte("data")
+	ca := crc32.ChecksumIEEE(a)
+	// Combining with zero-length second part should be identity
+	got := CRC32CombineIEEE(ca, 0, 0)
+	if got != ca {
+		t.Fatalf("zero-length combine mismatch: got %08x want %08x", got, ca)
+	}
+}

sdk/internal/zipstream/fuzz_test.go

@@ -0,0 +1,145 @@
+// Experimental: This package is EXPERIMENTAL and may change or be removed at any time
+
+package zipstream
+
+import (
+	"bytes"
+	"encoding/base64"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func unverifiedBase64Bytes(str string) []byte {
+	b, _ := base64.StdEncoding.DecodeString(str)
+	return b
+}
+
+func FuzzReader(f *testing.F) {
+	// seeds derived from existing unit tests
+	f.Add(unverifiedBase64Bytes("UEsDBC0ACAAAAD2WLTEAAAAAAAAAAAAAAAAJAAAAM" +
+		"C5wYXlsb2Fk08izTVcCMQg+XVhewRxbr57U17gYv3bdYO41/zR3XrezUEsHCApBjlYhAAAA" +
+		"IQAAAFBLAwQtAAgAAAA9li0xAAAAAAAAAAAAAAAADwAAADAubWFuaWZlc3QuanNvbnsiZW5" +
+		"jcnlwdGlvbkluZm9ybWF0aW9uIjp7InR5cGUiOiJzcGxpdCIsInBvbGljeSI6ImV5SjFkV2" +
+		"xrSWpvaVkyRmhPVEJpWVdFdE5UbGhOQzB4TVdWbUxUbGhNVFl0WVdFMVlqWmtaVGMxWVRCa" +
+		"klpd2lZbTlrZVNJNmV5SmtZWFJoUVhSMGNtbGlkWFJsY3lJNmJuVnNiQ3dpWkdsemMyVnRJ" +
+		"anB1ZFd4c2ZYMD0iLCJrZXlBY2Nlc3MiOlt7InR5cGUiOiJ3cmFwcGVkIiwidXJsIjoiaHR" +
+		"0cDovL2xvY2FsaG9zdDo2NTQzMi8iLCJwcm90b2NvbCI6ImthcyIsIndyYXBwZWRLZXkiOi" +
+		"JkK3dobEZJdEF2Y3lYYU5ZcWpmRmpiWXVDZVBGcTRyOS9ZSFJLeTJwWmwwRkxqa29oK3FUV" +
+		"XRJVkZOMFlkYjA5S0M3ZytkUllBdTFTSzYxYjE1MUJYRFJhZG9zQ1crTUlDWUFid1RLWENY" +
+		"RG15TW1HaVhKU2RHcWxza2NlakVJWXVUbDBXaGwxVisyUlhEZkl1WXZKN1N2YmZ2OExVVmN" +
+		"tNHFXR1R1RDBjcmVQNnhWaHVQdVE2V1FIOWlZNlA4K3kwUG92MEd3VzNTOWhZdlBjY3pNcG" +
+		"F0UTZPMytsbGZsYkxGRjZVcVdQMGVZcGxWU21nZXg1V3BjWFlreFJHdGZJTkRhYzBqS1NnM" +
+		"FpTUDdxbThQNXdPd2F3NlgzbUNQL3ZpYkxXQy9UYUczVEg0bmY2dXgvbWc3NEFvUWxockFs" +
+		"TUdpMTJwNUxGL0VabVZYeXlrSnhpYkE9PSIsInBvbGljeUJpbmRpbmciOnsiYWxnIjoiSFM" +
+		"yNTYiLCJoYXNoIjoiWTJRME1qWmhOVE15WWpoa09EQmtZamN5WWpGaE5XWTFZakkwTXpFek" +
+		"0yRmxaV1pqTTJWa1lqTXhOMlk1TnpNMk5EWmtNV0kxT0RFMU1tRTRNekJrT1E9PSJ9LCJra" +
+		"WQiOiJyMSJ9XSwibWV0aG9kIjp7ImFsZ29yaXRobSI6IkFFUy0yNTYtR0NNIiwiaXYiOiIi" +
+		"LCJpc1N0cmVhbWFibGUiOnRydWV9LCJpbnRlZ3JpdHlJbmZvcm1hdGlvbiI6eyJyb290U2l" +
+		"nbmF0dXJlIjp7ImFsZyI6IkhTMjU2Iiwic2lnIjoiTlRZMk1USTJaVFUxTWpRd09HVTVaR1" +
+		"kxT0dZM01qSmtObVEwTTJVd05XWTNNRGMwTm1RME1qZG1OVEEwTURKaFpUZzVNREExWVRRM" +
+		"FlqTTFOekJqTWc9PSJ9LCJzZWdtZW50SGFzaEFsZyI6IkdNQUMiLCJzZWdtZW50U2l6ZURl" +
+		"ZmF1bHQiOjIwOTcxNTIsImVuY3J5cHRlZFNlZ21lbnRTaXplRGVmYXVsdCI6MjA5NzE4MCw" +
+		"ic2VnbWVudHMiOlt7Imhhc2giOiJaRFJrTjJJNE1UaGlaamMyWkdRMk1HVmxNelZtWmpNME" +
+		"56YzFaV0kzWWpNPSIsInNlZ21lbnRTaXplIjo1LCJlbmNyeXB0ZWRTZWdtZW50U2l6ZSI6M" +
+		"zN9XX19LCJwYXlsb2FkIjp7InR5cGUiOiJyZWZlcmVuY2UiLCJ1cmwiOiIwLnBheWxvYWQi" +
+		"LCJwcm90b2NvbCI6InppcCIsIm1pbWVUeXBlIjoidGV4dC9wbGFpbiIsImlzRW5jcnlwdGV" +
+		"kIjp0cnVlfX1QSwcICGOQ8AsFAAALBQAAUEsBAi0ALQAIAAAAPZYtMQpBjlYhAAAAIQAAAA" +
+		"kAAAAAAAAAAAAAAAAAAAAAADAucGF5bG9hZFBLAQItAC0ACAAAAD2WLTEIY5DwCwUAAAsFA" +
+		"AAPAAAAAAAAAAAAAAAAAFgAAAAwLm1hbmlmZXN0Lmpzb25QSwUGAAAAAAIAAgB0AAAAoAUA" +
+		"AAAA"))
+	f.Add(unverifiedBase64Bytes("UEsDBC0ACAAAAD2WLTEAAAAAAAAAAAAAAAAJAAAAM" +
+		"C5wYXlsb2FkDSvwsbJutP3SwAxiF0WieCKrIIVAG0Ae4OHfVLFcwnhWAm13w4okVqReL7GB" +
+		"CmiI3OQIvl2zo7KWZABCfFLDc+9oCaRVnBaOWUy5ruMQlHeXJ3SdSZe0K3F77OHYueUWDh/" +
+		"WCdb+GG3LVQkOdKPr+GvIcOTktlJJojnFZTZ5fKxKzNwTNrTCAgqdzFU2RH696b3Nl0S3AW" +
+		"ovOWSM8UQ9mAB+H8x+QlSjHLX5m6OCGRFHLYInvLeHhbbso/8OU11LHjMqHeMOsyJAfpupo" +
+		"kv59QPa0XfjtXAhHp6M+V1zF3rJl3TTWq3NNnYfm29pYBkV4Cs9nBsZQ+LnhBMqXKLfic8b" +
+		"vAc+zShk2f6jmaZfiXSLWFDVxZjLGaGCWX8gvkOG8HlajEVI8bSDiC1JO9kIqBJxNFFmyPl" +
+		"HvMPEkx1sG2ZaYYZERc+JpJQTxnM6jI45JQ4JXCYPUP+m9RVlAkH2Stg719P3USbJFbvxgT" +
+		"XhsuTH0talbolQdKd3i7Zrl62DLn6GByJ/LqZNiNRy2PgDo2IFpx7J9VUQNfj9RjpoPzRmS" +
+		"lOIk+MFA4twmhYgWtSU6BsdynSirYZ4zZP0VrJ1TFVPygoGVsNy3CdP39kURmndFq6JPdcF" +
+		"uZ1Wx3zCur5aqmb6bDz1rIjmBpzkdmqoGWNPpsim6Tzkc6sBe90eASg8ksg40Bu4JVwFUD/" +
+		"XMH8oGWvP+5xriMckeCOEiGSJ1Ro0JDPv5kWoddLqz4XrPJ5jzy/Y82ZXbIji1PEf04J7nn" +
+		"NGQVzpYvqZszXNaEkri9VCcC1xgrgMJAYDRuGmGpw28kffaB9hMr2Ee5ubDwysEEAJhSYJb" +
+		"iityJpbuG8J4JBiKd5kdrr55SOPwG7ycJLdz1e0uhKHFpAyJJgNTRVaALVdm0W0kCmCeZTu" +
+		"OGL5naIY7iQGVB4iIFOpj2tbb1sm/bhsTz+fzd30Rf/SiNjn1bKXKKFygvBKIZ8rtUZwbp5" +
+		"FcghXtffgeGOo5omQ0XBUOmKW1V+lRVXUXjL6frYVe1y6ZkZQo+VCE/yKPqOQEZeAJSViWK" +
+		"7lPpavnSqcsgGZImiF7eeegvTIJks8vJOaqOXfEKpLKlGIpv+/dHrGgmq8OhkPFa/PjHC4Y" +
+		"EkNjNzL0PwTuX8OPcDAoGZ+DzSVnlS+iISNaN2x28o460YIYrMLeg1G/W8pFAk7zYyWLxLD" +
+		"T8kLY4FKdidD6OAtgSxJSmvRZnS01x9K1sVFTyy/Ng1SjnuwAM8e9tV3G7ffD1JK8VCglNx" +
+		"ZfOmKrt28EnKlU7+gAYC6vZQLgYLQzAYe8Dufq4xcUQ8oAmXdpQo+TiFGK7MuWGTZOpEa9w" +
+		"sQsviEqOqRU6Fsyy0KIYdUWa2NvAww862M9cDhT1UETESHGmOOmuBJunFLzAwKlI1QSwcIc" +
+		"cpeYxwEAAAcBAAAUEsDBC0ACAAAAD2WLTEAAAAAAAAAAAAAAAAPAAAAMC5tYW5pZmVzdC5q" +
+		"c29ueyJlbmNyeXB0aW9uSW5mb3JtYXRpb24iOnsidHlwZSI6InNwbGl0IiwicG9saWN5Ijo" +
+		"iZXlKMWRXbGtJam9pWTJGa09ETmlZalF0TlRsaE5DMHhNV1ZtTFRsaE1UWXRZV0UxWWpaa1" +
+		"pUYzFZVEJqSWl3aVltOWtlU0k2ZXlKa1lYUmhRWFIwY21saWRYUmxjeUk2Ym5Wc2JDd2laR" +
+		"2x6YzJWdElqcHVkV3hzZlgwPSIsImtleUFjY2VzcyI6W3sidHlwZSI6IndyYXBwZWQiLCJ1" +
+		"cmwiOiJodHRwOi8vbG9jYWxob3N0OjY1NDMyLyIsInByb3RvY29sIjoia2FzIiwid3JhcHB" +
+		"lZEtleSI6ImxDeHJnQ2dRUTlhYUdTRW5mcUpFK1h6a1pBaUVNMW1qRkpHR292MkFGQnJnUl" +
+		"J2aVU1WjZhNUJnSk15OU9tcWdORG5Db0ozWmQ4a1BzaGdSK25JdmpuUlBDdnRBcUo2NFlMT" +
+		"XVnaXI2dUxoU1VUb241SE1HRXVZcU1lTVkrNmRnbkdteDN0Ty9uZmJTNDBpQk1sZmxKcG0w" +
+		"bFNudExjZTFQd1VVbHJ5VkR4cTVUaHVROEFlaS9CUkNPMnpnT3Q2UjQwK3cxcjF3SnEwVXp" +
+		"MdzAraFY3dlJxdmJxVFluQmF4d3lhdTFhUmxHZ1VQUGFOWmFOcVpiUkdVYko4Z3R1bTRNQ0" +
+		"5DNmZJajFzR0NyM2FTSjdKTEFFRjlQdm9DL3RQd2diOXpiU0x1M0czb0kzUXY4aVl0Zk5PU" +
+		"3ZxaEZoajlTdVFTMWlFNGlxYmZ4Skp6Um0yRm9QZz09IiwicG9saWN5QmluZGluZyI6eyJh" +
+		"bGciOiJIUzI1NiIsImhhc2giOiJNell6TXpFMVpEWTFNVGt3WlRBeFkySXhNVEF6TURObU5" +
+		"HSTFPR1JqWXpFMVl6RXpaamswWkRrMVpETTFOMkV4WWpFd09XRmhaamxpWlRjMllUZzBZdz" +
+		"09In0sImtpZCI6InIxIn1dLCJtZXRob2QiOnsiYWxnb3JpdGhtIjoiQUVTLTI1Ni1HQ00iL" +
+		"CJpdiI6IiIsImlzU3RyZWFtYWJsZSI6dHJ1ZX0sImludGVncml0eUluZm9ybWF0aW9uIjp7" +
+		"InJvb3RTaWduYXR1cmUiOnsiYWxnIjoiSFMyNTYiLCJzaWciOiJNR014WmpZeFlqazVZbVp" +
+		"qTkdVNFlqSTVPREEzTWpJeFlURTJOREUzTXpRd01XTmpZVFJsWmpBd05tSmlOVFkwTVdFel" +
+		"l6WmlNekl6T1dRNE9XRTVNUT09In0sInNlZ21lbnRIYXNoQWxnIjoiR01BQyIsInNlZ21lb" +
+		"nRTaXplRGVmYXVsdCI6MjA5NzE1MiwiZW5jcnlwdGVkU2VnbWVudFNpemVEZWZhdWx0Ijoy" +
+		"MDk3MTgwLCJzZWdtZW50cyI6W3siaGFzaCI6Ik5EUTROekZoTmpNNFpUbGhaVEEwT1dKaE5" +
+		"6RTBZbU5qTUdNd1lUazBPR1E9Iiwic2VnbWVudFNpemUiOjEwMjQsImVuY3J5cHRlZFNlZ2" +
+		"1lbnRTaXplIjoxMDUyfV19fSwicGF5bG9hZCI6eyJ0eXBlIjoicmVmZXJlbmNlIiwidXJsI" +
+		"joiMC5wYXlsb2FkIiwicHJvdG9jb2wiOiJ6aXAiLCJtaW1lVHlwZSI6ImFwcGxpY2F0aW9u" +
+		"L29jdGV0LXN0cmVhbSIsImlzRW5jcnlwdGVkIjp0cnVlfX1QSwcI9qRQPB4FAAAeBQAAUEs" +
+		"BAi0ALQAIAAAAPZYtMXHKXmMcBAAAHAQAAAkAAAAAAAAAAAAAAAAAAAAAADAucGF5bG9hZF" +
+		"BLAQItAC0ACAAAAD2WLTH2pFA8HgUAAB4FAAAPAAAAAAAAAAAAAAAAAFMEAAAwLm1hbmlmZ" +
+		"XN0Lmpzb25QSwUGAAAAAAIAAgB0AAAArgkAAAAA"))
+	// large defined filename
+	f.Add(unverifiedBase64Bytes("UEsDBC0ACAAAAH11LzEAAAAAAAAAAAAAAAAJAAAAM" +
+		"C5wYXlsb2Fk5LJYrTiapi/CUQ0dlqMU0/VmunX+qRIyQghasf6aEVBLBwgke7o5HwAAAB8A" +
+		"AABQSwMELQAIAAAAfXUvMQAAAAAAAAAAAAAAAA8AAAAwLm1hbmlmZXN0Lmpzb257ImVOY3J" +
+		"5cHRpb25JbmZvcm1hdGlvbiI6eyJ0eXBlIjoic3BsaXQiLCJwb2xpY3kiOiJleUoxZFdsa0" +
+		"lqb2lZakF3TW1WaU9USXROV0l4TkMweE1XVm1MVGt4TW1NdFlXRTFZalprWlRjMVlUQmpJa" +
+		"XdpWW05a2VTSTZleUprWVhSaFFYUjBjbWx5ZFhSbGN5STZiblZzYkN3aVpHbHpjMlZ0SWpw" +
+		"dWRXeHNmWDA9Iiwia2V5QWNjZXNzIjpbeyJ0eXBlIjoid3JhcHBlZCIsInVybCI6ImV4YW1" +
+		"wbGUuY29tIiwicHJvdG9jb2wiOiJrYXMiLCJ3cmFwcGVkS2V5IjoiV1dZait3anNMQmtrU2" +
+		"FjTzZ2dEpJaTBLMUJQMVhtT2lzcFNrdm8wRm5QV0ZLM050UTVzN3YwOVpqQ05NV0JRK1VPa" +
+		"VhUTVNWa1JkNUdsTHlMblg3bjY4dDBmSDk0RnMyTnRjcFJwMSt6YStjdzVGRldFQy9uQUJp" +
+		"TmtPdldLeHdqeG5YQ1pEazZ4U3o1ZHdCT1MraUVCYXJ6WGMzR3oxR2JYcm5Ka0YvaitUUDR" +
+		"rbTJUYUpXN0cybFJaQ0J6T1M5RkpoSEFIcFBIcFF4V2tNK2FuZjJ1WExRV1UxT00vaHFVRz" +
+		"VFUG9nR0pYM3MxaVRmek4xNFhiczU5TmYyOU1rc284VjhJSnNOWVRPblBIejY4Q3VvOGdjc" +
+		"XZHd3J0a3FKQmlmYVM3N1FRQWxwUTcrSU9GME9ZSjh1WTZLZG1najltSU1aRUVaYkI3V2hO" +
+		"blNBbG9paWZBPT0iLCJwb2xpY3lCaW5kaW5nIjp7ImFsZyI6IkhTMjU2IiwiaGFzaCI6Ilp" +
+		"UY3pZMkV5WkdReVkySTJNRGN4WmpnellXVTVNRGsxWXpnNU5XWXhOalUwWVRjNE5tTXpPV1" +
+		"EwTW1JM05qQmxOemxsTmpWaVltWTRZalUyWkdNd013PT0ifX1dLCJtZXRob2QiOnsiYWxnb" +
+		"3JpdGhtIjoiQUVTLTI1Ni1HQ00iLCJpdiI6IiIsImlzU3RyZWFtYWJsZSI6dHJ1ZX0sImlu" +
+		"dGVncml0eUluZm9ybWF0aW9uIjp7InJvb3RTaWduYXR1cmUiOnsiYWxnIjoiSFMyNTYiLCJ" +
+		"zaWciOiJNRFZqTURReE1EWmtNR00wWlRRMllUZG1PRFJrWVRJM09UZGlPREk1WVRWak5EVX" +
+		"hPRGs0TkRreE1HWTFaV1kxTXpKbVpHWmtZMlkwWWprek0yVmhOZz09In0sInNlZ21lbnRIY" +
+		"XNoQWxnIjoiR01BQyIsInNlZ21lbnRTaXplRGVmYXVsdCI6MjA5NzE1MiwiZW5jcnlwdGVk" +
+		"U2VnbWVudFNpemVEZWZhdWx0IjoyMDk3MTgwLCJzZWdtZW50cyI6W3siaGFzaCI6IlpETm1" +
+		"OVFkyWW1FM05XWmxZVGt4TWpNeU5ESXdPRFZoWWpGbVpUbGhNVEU9Iiwic2VnbWVudFNpem" +
+		"UiOjMsImVuY3J5cHRlZFNlZ21lbnRTaXplIjozMX1dfX0sInBheWxvYWQiOnsidHlwZSI6I" +
+		"nJlZmVyZW5jZSIsInVybCI6IjAucGF5bG9hZCIsInByb3RvY29sIjoiemlwIiwibWltZVR5" +
+		"cGUiOiJhcHBsaWNhdGlvbi9vY3RldC1zdHJlYW0iLCJpc0VuY3J5cHRlZCI6dHJ1ZX19UEs" +
+		"HCALoriwCBQAAAgUAAFBLAQItAC0ACAAAAH11LzEke7o5HwAAAB8AAAAJAAAAAAAAAAAAAA" +
+		"AAAAAAAAAwLnBheWxvYWRQSwECLQAtAAgAAAB9dS8xAuiuLAIE///tBQAADwAAAAAAAAAAA" +
+		"AAAAABWAAAAMC5tYW5pZmVzdC5qc29uUEsFBgAAAAACAAIAdAAAAJUFAAAAAA=="))
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		reader, err := NewReader(bytes.NewReader(data))
+		if err != nil {
+			return
+		}
+		for k := range reader.fileEntries {
+			b, err := reader.ReadAllFileData(k, 1024*1024*20 /* 20MB Limit */)
+			if err != nil {
+				assert.Empty(t, b)
+			}
+		}
+	})
+}