added class File

svn-id: r4873

1 files changed, 171 insertions, 0 deletions

diff --git a/common/file.cpp b/common/file.cpp
new file mode 100644
index 0000000000..edb7ad997e
--- /dev/null
+++ b/common/file.cpp
@@ -0,0 +1,171 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2002 The ScummVM project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#include "file.h"
+
+#ifdef NEED_STRDUP
+char *strdup(const char *s) {
+	if (s) {
+		int len = strlen(s) + 1;
+		char *d = (char *)malloc(len);
+		if (d)
+			memcpy(d, s, len);
+		return d;
+	}
+	return NULL;
+}
+#endif /* NEED_STRDUP */
+
+File::File() {
+	_handle = NULL;
+	_readFailed = false;
+	_encbyte = 0;
+}
+
+File::~File() {
+	close();
+}
+
+bool File::open(const char *filename, int mode, byte encbyte) {
+	char * buf;
+	if (_handle) {
+		debug(2, "File %s already opened", filename);
+		return false;
+	}
+
+	clearReadFailed();
+	buf = strdup(filename);
+	if (mode == 1) {
+		_handle = fopen(buf, "rb");
+		if (_handle == NULL) {
+			_handle = fopen(strupr(buf), "rb");
+			if (_handle == NULL) {
+				_handle = fopen(strlwr(buf), "rb");
+			}
+			else {
+				debug(2, "File %s not found", filename);
+				return false;
+			}
+		}
+	}
+	else {
+		warning("Only read mode supported!");
+		return false;
+	}
+
+	return true;
+}
+
+void File::close() {
+	if (_handle)
+		fclose(_handle);
+}
+
+bool File::readFailed() {
+	return _readFailed != 0;
+}
+
+void File::clearReadFailed() {
+	_readFailed = false;
+}
+
+bool File::eof() {
+	if (_handle == NULL) {
+		error("File is not open!");
+		return false;
+	}
+
+	return feof(_handle) != 0;
+}
+
+uint32 File::pos() {
+	if (_handle == NULL) {
+		error("File is not open!");
+		return 0;
+	}
+
+	return ftell(_handle);
+}
+
+void File::seek(uint32 offs, int whence) {
+	if (_handle == NULL) {
+		error("File is not open!");
+		return;
+	}
+
+	if (fseek(_handle, offs, whence) != 0)
+		clearerr(_handle);
+}
+
+void File::read(void *ptr, uint32 size) {
+	byte *ptr2 = (byte *)ptr;
+
+	if (_handle == NULL) {
+		error("File is not open!");
+		return;
+	}
+
+	if (size == 0)
+		return;
+
+	if ((uint32)fread(ptr2, size, 1, _handle) != 1) {
+		clearerr(_handle);
+		_readFailed = true;
+	}
+
+	do {
+		*ptr2++ ^= _encbyte;
+	} while (--size);
+}
+
+byte File::fileReadByte() {
+	byte b;
+
+	if (fread(&b, 1, 1, _handle) != 1) {
+		clearerr(_handle);
+		_readFailed = true;
+	}
+	return b ^ _encbyte;
+}
+
+uint16 File::fileReadWordLE() {
+	uint a = fileReadByte();
+	uint b = fileReadByte();
+	return a | (b << 8);
+}
+
+uint32 File::fileReadDwordLE() {
+	uint a = fileReadWordLE();
+	uint b = fileReadWordLE();
+	return (b << 16) | a;
+}
+
+uint16 File::fileReadWordBE() {
+	uint b = fileReadByte();
+	uint a = fileReadByte();
+	return a | (b << 8);
+}
+
+uint32 File::fileReadDwordBE() {
+	uint b = fileReadWordBE();
+	uint a = fileReadWordBE();
+	return (b << 16) | a;
+}