1 files changed, 198 insertions, 0 deletions
diff --git a/file_use.c b/file_use.c
new file mode 100644
index 0000000..cd816bc
--- /dev/null
+++ b/file_use.c
@@ -0,0 +1,198 @@
+#include "file_use.h"
+
+
+void f_file_null( f_file *f_f )
+{
+	if ( f_f )
+	{
+		f_f->fid = NULL;
+		f_f->flags = 0;
+		f_f->size = -1;
+		f_f->seek = -1;
+	}
+}
+
+int f_file_seek( f_file *f_f, long offset, int seek )
+{
+	int ret=-1;
+	PRINT("\n");
+	if ( f_f )
+	{
+		if ( offset < 0 )
+		{
+			ERROR("\n");
+			return -1;
+		}
+
+		if ( offset > f_f->size )
+		{
+			ERROR("\n");
+			return -1;
+		}
+		
+		
+		ret = fseek( f_f->fid, offset , seek );
+		PRINT("ret=%d\n",ret);
+		if ( ret == 0 )
+		{
+			f_f->seek = ret;
+		}
+		else
+		{
+			ERROR("cannot seek to %d\n", offset);
+			return -1;
+		}
+		PRINT("ret=%d\n",ret);
+	}
+	return ret;
+}
+
+
+size_t f_file_read( f_file *f_f, size_t size, void *ptr )
+{
+	size_t ret=-1;
+	PRINT("\n");
+	if ( f_f )
+	{
+		if ( (f_f->flags == F_FILE_READ) ||
+			(f_f->flags == F_FILE_RW))
+		{
+			if ( f_f->size >= f_f->seek + f_f->size )
+			{
+				ret = fread( ptr, 1, size, f_f->fid );
+				/*
+				if ( ret != size )
+				{
+					ERROR("%d != %d\n", ret, size );
+					return -1;
+				}
+				else
+				*/
+				if ( ret < 0 )
+				{
+					ERROR("\n");
+					return ret;
+				}
+			} else
+			{
+				ERROR("\n");
+			}
+		} else
+		{
+			ERROR("file writable only");
+		}
+	}
+	return ret;
+}
+
+
+int f_file_size( f_file *f_f )
+{
+	int ret=-1;
+	long old_seek;
+
+	PRINT("\n");
+	if ( f_f )
+	{
+		//could make some logic break
+		if ( f_f->size < 0 )
+		{
+			old_seek = ftell( f_f->fid );
+			fseek( f_f->fid, 0, SEEK_END );
+			ret = ftell( f_f->fid );
+			fseek( f_f->fid, old_seek, SEEK_CUR );
+		}
+	}
+	return ret;
+}
+
+
+//f_file_read_bl();
+
+
+size_t f_file_write( f_file *f_f, size_t size, void *ptr )
+{
+	PRINT("%s\n");
+	if ( f_f )
+	{
+		if ((f_f->flags == F_FILE_WRITE) || 
+			(f_f->flags == F_FILE_RW) )
+		{
+			ERROR("Not yet ready\n");
+		}
+	}
+	
+}
+
+
+//f_file_write_bl();
+
+
+f_file* f_file_open( const char *fname, int flags )
+{
+	f_file *ret = NULL;
+
+	const char *f_flags_write="r";
+	const char *f_flags_read="w";
+	const char *f_flags_rw="r+";
+	char *f_flags_tmp=NULL;
+
+	if ( fname != NULL )
+	{
+		ret = malloc( sizeof( f_file ) );
+		if ( ret == NULL )
+		{
+			ERROR("Cannot alloc mem\n");
+			return NULL;
+		}
+		memset( ret, 0, sizeof( f_file ));
+		f_file_null( ret );
+		switch ( flags )
+		{
+			case F_FILE_READ:
+				f_flags_tmp = f_flags_read;
+				ret->flags = F_FILE_READ;
+				break;
+
+			case F_FILE_WRITE:
+				f_flags_tmp = f_flags_write;
+				ret->flags = F_FILE_WRITE;
+				break;
+			
+			case F_FILE_RW:
+				f_flags_tmp = f_flags_rw;
+				ret->flags = F_FILE_RW;
+				break;
+
+			default:
+				ERROR("Unknown flag for opening \n");
+				goto exit_close_f;
+		}
+		ret->fid = fopen( fname, "r" );
+		if ( ret->fid == NULL )
+		{
+			ERROR("Cannot open file\n");
+			goto exit_close_f;
+		}
+		ret->size = f_file_size( ret );
+	}
+	return ret;
+
+exit_close_f:
+	if ( ret != NULL )
+		free( ret );
+	return NULL;
+}
+
+
+int f_file_close( f_file *f_f )
+{
+	PRINT("\n");
+	if ( f_f )
+	{
+		fclose( f_f->fid );
+		free( f_f );
+		f_f = NULL;
+	}
+}
+