From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 third_party/jpeg-xl/lib/jxl/base/span.h | 80 +++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 third_party/jpeg-xl/lib/jxl/base/span.h

(limited to 'third_party/jpeg-xl/lib/jxl/base/span.h')

diff --git a/third_party/jpeg-xl/lib/jxl/base/span.h b/third_party/jpeg-xl/lib/jxl/base/span.h
new file mode 100644
index 0000000000..dc1c781b9d
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jxl/base/span.h
@@ -0,0 +1,80 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_BASE_SPAN_H_
+#define LIB_JXL_BASE_SPAN_H_
+
+// Span (array view) is a non-owning container that provides cheap "cut"
+// operations and could be used as "ArrayLike" data source for PaddedBytes.
+
+#include <cstddef>
+#include <cstdint>
+#include <vector>
+
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+
+template <typename T>
+class Span {
+ public:
+  constexpr Span() noexcept : Span(nullptr, 0) {}
+
+  constexpr Span(T* array, size_t length) noexcept
+      : ptr_(array), len_(length) {}
+
+  template <size_t N>
+  explicit constexpr Span(T (&a)[N]) noexcept : Span(a, N) {}
+
+  template <typename U>
+  constexpr Span(U* array, size_t length) noexcept
+      : ptr_(reinterpret_cast<T*>(array)), len_(length) {
+    static_assert(sizeof(U) == sizeof(T), "Incompatible type of source.");
+  }
+
+  template <typename ArrayLike>
+  explicit constexpr Span(const ArrayLike& other) noexcept
+      : Span(reinterpret_cast<T*>(other.data()), other.size()) {
+    static_assert(sizeof(*other.data()) == sizeof(T),
+                  "Incompatible type of source.");
+  }
+
+  constexpr T* data() const noexcept { return ptr_; }
+
+  constexpr size_t size() const noexcept { return len_; }
+
+  constexpr bool empty() const noexcept { return len_ == 0; }
+
+  constexpr T* begin() const noexcept { return data(); }
+
+  constexpr T* end() const noexcept { return data() + size(); }
+
+  constexpr T& operator[](size_t i) const noexcept {
+    // MSVC 2015 accepts this as constexpr, but not ptr_[i]
+    return *(data() + i);
+  }
+
+  void remove_prefix(size_t n) noexcept {
+    JXL_ASSERT(size() >= n);
+    ptr_ += n;
+    len_ -= n;
+  }
+
+  // NCT == non-const-T; compiler will complain if NCT is not compatible with T.
+  template <typename NCT>
+  void AppendTo(std::vector<NCT>* dst) const {
+    dst->insert(dst->end(), begin(), end());
+  }
+
+ private:
+  T* ptr_;
+  size_t len_;
+};
+
+typedef Span<const uint8_t> Bytes;
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_BASE_SPAN_H_
-- 
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