Blame SOURCES/squid-4.15-ftp-filename-extraction.patch

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diff --git a/src/clients/FtpGateway.cc b/src/clients/FtpGateway.cc
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index da9867f..e992638 100644
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--- a/src/clients/FtpGateway.cc
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+++ b/src/clients/FtpGateway.cc
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@@ -1084,16 +1084,17 @@ Ftp::Gateway::checkAuth(const HttpHeader * req_hdr)
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 void
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 Ftp::Gateway::checkUrlpath()
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 {
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-    static SBuf str_type_eq("type=");
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-    auto t = request->url.path().rfind(';');
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-
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-    if (t != SBuf::npos) {
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-        auto filenameEnd = t-1;
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-        if (request->url.path().substr(++t).cmp(str_type_eq, str_type_eq.length()) == 0) {
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-            t += str_type_eq.length();
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-            typecode = (char)xtoupper(request->url.path()[t]);
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-            request->url.path(request->url.path().substr(0,filenameEnd));
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-        }
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+    // If typecode was specified, extract it and leave just the filename in
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+    // url.path. Tolerate trailing garbage or missing typecode value. Roughly:
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+    // [filename] ;type=[typecode char] [trailing garbage]
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+    static const SBuf middle(";type=");
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+    const auto typeSpecStart = request->url.path().find(middle);
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+    if (typeSpecStart != SBuf::npos) {
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+        const auto fullPath = request->url.path();
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+        const auto typecodePos = typeSpecStart + middle.length();
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+        typecode = (typecodePos < fullPath.length()) ?
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+            static_cast<char>(xtoupper(fullPath[typecodePos])) : '\0';
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+        request->url.path(fullPath.substr(0, typeSpecStart));
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     }
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     int l = request->url.path().length();