Move calling convention for native imports into Constants

src/LibDeflate/Imports/Checksums.cs

@@ -12,7 +12,7 @@ internal static class Checksums
     /// required initial value for 'adler' is 1.  This value is also returned when
     /// 'buffer' is specified as NULL.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern uint libdeflate_adler32(uint adler, in byte buffer, size_t len);
 
     ///<summary>
@@ -21,6 +21,6 @@ internal static class Checksums
     /// initial value for 'crc' is 0.  This value is also returned when 'buffer' is
     /// specified as NULL.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern uint libdeflate_crc32(uint crc, in byte buffer, size_t len);
 }

src/LibDeflate/Imports/Compression.cs

@@ -25,13 +25,13 @@ internal static class Compression
     /// A single compressor is not safe to use by multiple threads concurrently.
     /// However, different threads may use different compressors concurrently.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_compressor libdeflate_alloc_compressor(int compression_level);
 
     /// <summary>
     /// Like <see cref="libdeflate_alloc_compressor"/> but allows specifying advanced options per-compressor.
     /// </summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_compressor libdeflate_alloc_compressor_ex(int compression_level, in libdeflate_options options);
 
     ///<summary>
@@ -41,7 +41,7 @@ internal static class Compression
     /// bytes.  The return value is the compressed size in bytes, or 0 if the data
     /// could not be compressed to 'out_nbytes_avail' bytes or fewer.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern size_t libdeflate_deflate_compress(libdeflate_compressor compressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail);
 
     ///<summary>
@@ -69,44 +69,44 @@ internal static class Compression
     /// libdeflate_deflate_compress() returns 0, indicating that the compressed data
     /// did not fit into the provided output buffer.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern size_t libdeflate_deflate_compress_bound(libdeflate_compressor compressor, size_t in_nbytes);
 
     ///<summary>
     /// Like libdeflate_deflate_compress(), but stores the data in the zlib wrapper
     /// format.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern size_t libdeflate_zlib_compress(libdeflate_compressor compressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail);
 
     ///<summary>
     /// Like libdeflate_deflate_compress_bound(), but assumes the data will be
     /// compressed with libdeflate_zlib_compress() rather than with
     /// libdeflate_deflate_compress().
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern size_t libdeflate_zlib_compress_bound(libdeflate_compressor compressor, size_t in_nbytes);
 
     ///<summary>
     /// Like libdeflate_deflate_compress(), but stores the data in the gzip wrapper
     /// format.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern size_t libdeflate_gzip_compress(libdeflate_compressor compressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail);
 
     ///<summary>
     /// Like libdeflate_deflate_compress_bound(), but assumes the data will be
     /// compressed with libdeflate_gzip_compress() rather than with
     /// libdeflate_deflate_compress().
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern size_t libdeflate_gzip_compress_bound(libdeflate_compressor compressor, size_t in_nbytes);
 
     ///<summary>
     /// libdeflate_free_compressor() frees a compressor that was allocated with
     /// libdeflate_alloc_compressor().  If a NULL pointer is passed in, no action is
     /// taken.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern void libdeflate_free_compressor(libdeflate_compressor compressor);
 }

src/LibDeflate/Imports/Constants.cs

@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 [assembly: InternalsVisibleTo($"{nameof(LibDeflate)}.Tests")]
 [assembly: InternalsVisibleTo($"{nameof(LibDeflate)}.DangerousTests")]
@@ -7,4 +8,5 @@ namespace LibDeflate.Imports;
 internal static class Constants
 {
     public const string DllName = "libdeflate";
+    public const CallingConvention CallConv = CallingConvention.Cdecl;
 }

src/LibDeflate/Imports/CustomMemoryAllocator.cs

@@ -20,6 +20,6 @@ internal static class CustomMemoryAllocator
     /// There must not be any libdeflate_compressor or libdeflate_decompressor
     /// structures in existence when calling this function.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern void libdeflate_set_memory_allocator(malloc_func malloc, free_func free);
 }

src/LibDeflate/Imports/Decompression.cs

@@ -48,13 +48,13 @@ public enum libdeflate_result
     /// A single decompressor is not safe to use by multiple threads concurrently.
     /// However, different threads may use different decompressors concurrently.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_decompressor libdeflate_alloc_decompressor();
 
     /// <summary>
     /// Like <see cref="libdeflate_alloc_decompressor"/> but allows specifying advanced options per-decompressor.
     /// </summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_decompressor libdeflate_alloc_decompressor_ex(in libdeflate_options options);
 
     ///<summary>
@@ -89,7 +89,7 @@ public enum libdeflate_result
     ///     not large enough but no other problems were encountered, or another
     ///     nonzero result code if decompression failed for another reason.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_result libdeflate_deflate_decompress(libdeflate_decompressor decompressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail, out size_t actual_out_nbytes_ret);
 
     ///<summary>
@@ -98,7 +98,7 @@ public enum libdeflate_result
     /// then the actual compressed size of the DEFLATE stream (aligned to the next
     /// byte boundary) is written to *actual_in_nbytes_ret.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_result libdeflate_deflate_decompress_ex(libdeflate_decompressor decompressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail, out size_t actual_in_nbytes_ret, out size_t actual_out_nbytes_ret);
 
     ///<summary>
@@ -109,7 +109,7 @@ public enum libdeflate_result
     /// than 'in_nbytes'.  If you need to know exactly where the zlib stream ended,
     /// use libdeflate_zlib_decompress_ex().
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_result libdeflate_zlib_decompress(libdeflate_decompressor decompressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail, out size_t actual_out_nbytes_ret);
 
     ///<summary>
@@ -120,7 +120,7 @@ public enum libdeflate_result
     /// than 'in_nbytes'.  If you need to know exactly where the zlib stream ended,
     /// use libdeflate_zlib_decompress_ex().
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_result libdeflate_zlib_decompress_ex(libdeflate_decompressor decompressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail, out size_t actual_in_nbytes_ret, out size_t actual_out_nbytes_ret);
 
     ///<summary>
@@ -131,7 +131,7 @@ public enum libdeflate_result
     /// will be decompressed.  Use libdeflate_gzip_decompress_ex() if you need
     /// multi-member support.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_result libdeflate_gzip_decompress(libdeflate_decompressor decompressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail, out size_t actual_out_nbytes_ret);
 
     ///<summary>
@@ -141,14 +141,14 @@ public enum libdeflate_result
     /// buffer was decompressed), then the actual number of input bytes consumed is
     /// written to *actual_in_nbytes_ret.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern libdeflate_result libdeflate_gzip_decompress_ex(libdeflate_decompressor decompressor, in byte @in, size_t in_nbytes, ref byte @out, size_t out_nbytes_avail, out size_t actual_in_nbytes_ret, out size_t actual_out_nbytes_ret);
 
     ///<summary>
     /// libdeflate_free_decompressor() frees a decompressor that was allocated with
     /// libdeflate_alloc_decompressor().  If a NULL pointer is passed in, no action
     /// is taken.
     ///</summary>
-    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+    [DllImport(Constants.DllName, CallingConvention = Constants.CallConv, ExactSpelling = true)]
     public static extern void libdeflate_free_decompressor(libdeflate_decompressor decompressor);
 }