audit: EterBase CRC32/FileBase/MappedFile mapped, with port.utils checks

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/port/port_utils_test.cpp

@@ -1,11 +1,14 @@
 #include "EterBase/StdAfx.h"
 #include "EterBase/Utils.h"
 #include "EterBase/FileLoader.h"
+#include "EterBase/CRC32.h"
+#include "EterBase/MappedFile.h"
 
 #include <cstdio>
 #include <cstring>
 #include <string>
 #include <vector>
+#include <unistd.h>
 
 int main()
 {
@@ -88,5 +91,77 @@ int main()
 		check(!disk.Open("/nonexistent/mt_fileloader"), "DiskFileLoader missing");
 		remove(path);
 	}
+
+	// CRC32: the IEEE check value, GetCaseCRC32 folds ASCII case (effect/sound/tree name keys), and the
+	// file variants (guild symbol CRC + size, GuildMarkDownloader) CRC the whole file.
+	{
+		check(GetCRC32("123456789", 9) == 0xCBF43926u, "GetCRC32 check value");
+		check(GetCaseCRC32("D:/Ymir Work/A.MSE", 18) == GetCaseCRC32("d:/ymir work/a.mse", 18), "GetCaseCRC32 case fold");
+		check(GetCaseCRC32("abc", 3) == GetCRC32("ABC", 3), "GetCaseCRC32 folds to upper case");
+
+		char path[] = "/tmp/mt_crc32_XXXXXX";
+		int fd = mkstemp(path);
+		FILE * fp = fdopen(fd, "wb");
+		fwrite("123456789", 1, 9, fp);
+		fclose(fp);
+		check(GetFileCRC32(path) == 0xCBF43926u, "GetFileCRC32");
+		check(GetFileSize(path) == 9, "GetFileSize");
+		fp = fopen(path, "rb");
+		fseek(fp, 4, SEEK_SET);
+		check(GetHFILECRC32(fp) == 0xCBF43926u && ftell(fp) == 4, "GetHFILECRC32 whole file, position kept");
+		fclose(fp);
+		check(GetFileCRC32("/nonexistent/mt_crc32") == 0 && GetFileSize("/nonexistent/mt_crc32") == 0, "CRC32 missing file");
+		remove(path);
+	}
+
+	// CFileBase (Win32 HANDLE -> FILE*): write mode opens without truncating and tracks the size, Seek clamps
+	// to the size, SeekCur takes the DWORD as a signed distance, Read succeeds on a short read.
+	// CMappedFile: the view at a non-aligned offset, Seek clamps, Read refuses past the end,
+	// AppendDataBlock re-links onto a copy.
+	{
+		char path[] = "/tmp/mt_filebase_XXXXXX";
+		close(mkstemp(path));
+		{
+			CFileBase f;
+			check(f.IsNull(), "CFileBase IsNull before Create");
+			check(f.Create(path, CFileBase::FILEMODE_WRITE) && !f.IsNull(), "CFileBase Create write");
+			check(strcmp(f.GetFileName(), path) == 0, "CFileBase GetFileName");
+			check(f.Write("abcdefgh", 8) && f.Size() == 8 && f.GetPosition() == 8, "CFileBase Write size/position");
+		}
+		{
+			CFileBase f;
+			check(f.Create(path, CFileBase::FILEMODE_WRITE) && f.Size() == 8, "CFileBase write mode keeps contents");
+			f.Seek(100);
+			check(f.GetPosition() == 8, "CFileBase Seek clamps to size");
+			f.Seek(2);
+			f.SeekCur(3);
+			check(f.GetPosition() == 5, "CFileBase SeekCur forward");
+			f.SeekCur(DWORD(-2));
+			check(f.GetPosition() == 3, "CFileBase SeekCur negative distance");
+			char buf[8] = {};
+			check(f.Read(buf, 2) && buf[0] == 'd' && buf[1] == 'e', "CFileBase Read");
+			check(f.Read(buf, 8), "CFileBase short Read succeeds");
+		}
+		{
+			CFileBase f;
+			check(!f.Create("/nonexistent/mt_filebase", CFileBase::FILEMODE_READ) && f.IsNull(), "CFileBase missing file");
+		}
+		{
+			CMappedFile mf;
+			const void * view = NULL;
+			check(mf.Create(path, &view, 3, 4) && memcmp(view, "defg", 4) == 0, "CMappedFile view at offset");
+			check(mf.Get() == view && mf.GetPosition() == 3 && mf.Size() == 4, "CMappedFile Get/GetPosition/Size");
+			char buf[8] = {};
+			check(mf.Read(buf, 3) && memcmp(buf, "def", 3) == 0 && mf.GetSeekPosition() == 3, "CMappedFile Read");
+			check(!mf.Read(buf, 2) && mf.GetSeekPosition() == 3, "CMappedFile Read past end");
+			check(*mf.GetCurrentSeekPoint() == 'g', "CMappedFile GetCurrentSeekPoint");
+			check(mf.Seek(1, CMappedFile::SEEK_TYPE_CURRENT) == 4 && mf.Seek(9, CMappedFile::SEEK_TYPE_CURRENT) == 4, "CMappedFile Seek current clamps");
+			check(mf.Seek(1, CMappedFile::SEEK_TYPE_END) == 3 && mf.Seek(1) == 1, "CMappedFile Seek end/begin");
+			BYTE * joined = mf.AppendDataBlock("XY", 2);
+			check(mf.Size() == 6 && memcmp(joined, "defgXY", 6) == 0, "CMappedFile AppendDataBlock");
+			check(!mf.Create(path, &view, 6, 4), "CMappedFile view past the end");
+		}
+		remove(path);
+	}
 	return failures ? 1 : 0;
 }