[pzstd] Fixes for Windows build

* `#include <algorithm>`
* Fix conversion warnings
* Assert that windowLog <= 23, which is currently always the case.
  This could be loosened, but we aren't looking to add new functionality.

Fixes on top of PR #3375 by @eli-schwartz, which added Windows CI for contrib & programs.

contrib/pzstd/Pzstd.cpp

@@ -15,6 +15,7 @@
 #include "utils/ThreadPool.h"
 #include "utils/WorkQueue.h"
 
+#include <algorithm>
 #include <chrono>
 #include <cinttypes>
 #include <cstddef>
@@ -336,6 +337,10 @@ static size_t calculateStep(
     const ZSTD_parameters &params) {
   (void)size;
   (void)numThreads;
+  // Not validated to work correctly for window logs > 23.
+  // It will definitely fail if windowLog + 2 is >= 4GB because
+  // the skippable frame can only store sizes up to 4GB.
+  assert(params.cParams.windowLog <= 23);
   return size_t{1} << (params.cParams.windowLog + 2);
 }
 
@@ -587,7 +592,8 @@ std::uint64_t writeFile(
       // start writing before compression is done because we need to know the
       // compressed size.
       // Wait for the compressed size to be available and write skippable frame
-      SkippableFrame frame(out->size());
+      assert(uint64_t(out->size()) < uint64_t(1) << 32);
+      SkippableFrame frame(uint32_t(out->size()));
       if (!writeData(frame.data(), outputFd)) {
         errorHolder.setError("Failed to write output");
         return bytesWritten;

contrib/pzstd/utils/FileSystem.h

@@ -13,6 +13,7 @@
 #include <sys/stat.h>
 #include <cerrno>
 #include <cstdint>
+#include <limits>
 #include <system_error>
 
 // A small subset of `std::filesystem`.
@@ -82,11 +83,11 @@ inline std::uintmax_t file_size(
     std::error_code& ec) noexcept {
   auto stat = status(path, ec);
   if (ec) {
-    return -1;
+    return std::numeric_limits<uintmax_t>::max();
   }
   if (!is_regular_file(stat)) {
     ec.assign(ENOTSUP, std::generic_category());
-    return -1;
+    return std::numeric_limits<uintmax_t>::max();
   }
   ec.clear();
   return stat.st_size;

contrib/pzstd/utils/Range.h

@@ -15,6 +15,7 @@
 
 #include "utils/Likely.h"
 
+#include <algorithm>
 #include <cstddef>
 #include <cstring>
 #include <stdexcept>