From 13771971cfaef6356ba47668cae6ce25c5c2071f Mon Sep 17 00:00:00 2001
From: Aqua-sama <aqua@iserlohn-fortress.net>
Date: Sun, 29 Mar 2020 22:59:04 +0300
Subject: Drop dependency on serge-sans-paille/frozen

format:
    - instead of frozen::unordered_map, create two std::arrays with
    the aliased names (entries) and respective data (values)

libembed:
    - Resources and CompressedResources convenience classes for raw
    and compressed resources respectively
    - Resources can be constexpr in regular usage
    - Annotate Resources::decompress accordingly
---
 lib/compressionctx.h | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 lib/compressionctx.h

(limited to 'lib/compressionctx.h')

diff --git a/lib/compressionctx.h b/lib/compressionctx.h
new file mode 100644
index 0000000..2f3946a
--- /dev/null
+++ b/lib/compressionctx.h
@@ -0,0 +1,40 @@
+#include <span>
+#include <vector>
+
+#pragma once
+
+namespace embed
+{
+
+enum Compression {
+    None,
+    Zstd
+};
+
+class CompressionCtx
+{
+public:
+    virtual ~CompressionCtx() = default;
+    [[nodiscard]] virtual std::vector<uint8_t> decompress(const std::span<const uint8_t> &entry) const = 0;
+};
+
+class ZstdCompressionCtx final : public CompressionCtx
+{
+public:
+    ZstdCompressionCtx(const std::span<const uint8_t> &dictionary);
+    ~ZstdCompressionCtx();
+    [[nodiscard]] std::vector<uint8_t> decompress(const std::span<const uint8_t> &entry) const override;
+};
+
+std::unique_ptr<CompressionCtx> make_compression_ctx(const Compression algo, const std::span<const uint8_t> &dict)
+{
+    switch(algo)
+    {
+        case None:
+            return nullptr;
+        case Zstd:
+            return std::make_unique<ZstdCompressionCtx>(dict);
+    }
+}
+
+} // namespace embed
-- 
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