LZMS: share 'struct lzms_probabilities' between compressor and decompressor

[wimlib] / include / wimlib / file_io.h

diff --git a/include/wimlib/file_io.h b/include/wimlib/file_io.h
index 1d258983354d2e5f95964d740fced0aa87e6840d..61ae78b9e270aee622376346a68e0eff7ad18af0 100644 (file)
--- a/include/wimlib/file_io.h
+++ b/include/wimlib/file_io.h
@@ -1,39 +1,59 @@
 #ifndef _WIMLIB_FILE_IO_H
 #define _WIMLIB_FILE_IO_H
 
+#include <stdbool.h>
 #include <stddef.h>
 #include <sys/types.h>
 
-extern size_t
-full_read(int fd, void *buf, size_t n);
-
-extern size_t
-full_write(int fd, const void *buf, size_t n);
-
-extern size_t
-full_pread(int fd, void *buf, size_t nbyte, off_t offset);
+/* Wrapper around a file descriptor that keeps track of offset (including in
+ * pipes, which don't support lseek()) and a cached flag that tells whether the
+ * file descriptor is a pipe or not.  */
+struct filedes {
+       int fd;
+       unsigned int is_pipe : 1;
+       off_t offset;
+};
 
-extern size_t
-full_pwrite(int fd, const void *buf, size_t count, off_t offset);
+extern int
+full_read(struct filedes *fd, void *buf, size_t n);
 
+extern int
+full_pread(struct filedes *fd, void *buf, size_t nbyte, off_t offset);
 
-#ifdef __WIN32__
-struct iovec {
-       void *iov_base;
-       size_t iov_len;
-};
-#else
-struct iovec;
-#endif
+extern int
+full_write(struct filedes *fd, const void *buf, size_t n);
 
-extern size_t
-full_writev(int fd, struct iovec *iov, int iovcnt);
-
-extern off_t
-filedes_offset(int fd);
+extern int
+full_pwrite(struct filedes *fd, const void *buf, size_t count, off_t offset);
 
 #ifndef __WIN32__
 #  define O_BINARY 0
 #endif
 
+extern off_t
+filedes_seek(struct filedes *fd, off_t offset);
+
+extern bool
+filedes_is_seekable(struct filedes *fd);
+
+static inline void filedes_init(struct filedes *fd, int raw_fd)
+{
+       fd->fd = raw_fd;
+       fd->offset = 0;
+       fd->is_pipe = 0;
+}
+
+static inline void filedes_invalidate(struct filedes *fd)
+{
+       fd->fd = -1;
+}
+
+#define filedes_close(f) close((f)->fd)
+
+static inline bool
+filedes_valid(const struct filedes *fd)
+{
+       return fd->fd != -1;
+}
+
 #endif /* _WIMLIB_FILE_IO_H */