Reranko05 commented on code in PR #49660:
URL: https://github.com/apache/arrow/pull/49660#discussion_r3052596213
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cpp/src/arrow/vendored/base64.cpp:
##########
@@ -93,18 +97,51 @@ std::string base64_encode(std::string_view
string_to_encode) {
return base64_encode(bytes_to_encode, in_len);
}
-std::string base64_decode(std::string_view encoded_string) {
+arrow::Result<std::string> base64_decode(std::string_view encoded_string) {
size_t in_len = encoded_string.size();
int i = 0;
int j = 0;
int in_ = 0;
unsigned char char_array_4[4], char_array_3[3];
std::string ret;
- while (in_len-- && ( encoded_string[in_] != '=') &&
is_base64(encoded_string[in_])) {
+ static const std::string base64_chars =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/";
+
+ auto is_base64 = [](unsigned char c) -> bool {
+ return (std::isalnum(c) || (c == '+') || (c == '/'));
+ };
+
+ if (encoded_string.size() % 4 != 0) {
+ return arrow::Status::Invalid("Invalid base64 input: length is not a
multiple of 4");
+ }
+
+ size_t padding_start = encoded_string.find('=');
Review Comment:
Thanks for pointing it out. I’ll integrate the validation into the decoding
loop to avoid the extra pass.
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