More refactoring, decouple tweaks from hecl

Runtime/Streams/CZipInputStream.cpp

@@ -0,0 +1,27 @@
+#include "CZipInputStream.hpp"
+
+namespace metaforce {
+CZipInputStream::CZipInputStream(std::unique_ptr<CInputStream>&& strm)
+: CInputStream(4096), x24_compBuf(new u8[4096]), x28_strm(std::move(strm)) {
+  x30_zstrm = std::make_unique<z_stream>();
+  x30_zstrm->next_in = x24_compBuf.get();
+  x30_zstrm->avail_in = 0;
+  x30_zstrm->zalloc = [](void*, u32 c, u32 n) -> void* { return new u8[size_t{c} * size_t{n}]; };
+  x30_zstrm->zfree = [](void*, void* buf) { delete[] static_cast<u8*>(buf); };
+  inflateInit(x30_zstrm.get());
+}
+
+CZipInputStream::~CZipInputStream() { inflateEnd(x30_zstrm.get()); }
+
+u32 CZipInputStream::Read(void* buf, u32 len) {
+  x30_zstrm->next_out = static_cast<Bytef *>(buf);
+  x30_zstrm->avail_out = len;
+  if (x30_zstrm->avail_in == 0) {
+    x30_zstrm->avail_in = x28_strm->ReadBytes(x24_compBuf.get(),4096);
+    x30_zstrm->next_in = x24_compBuf.get();
+  }
+  inflate(x30_zstrm.get(), Z_NO_FLUSH);
+  return len - x30_zstrm->avail_out;
+}
+
+} // namespace metaforce