+ char *name; /* File name for error messages */
+ sh_off_t pos; /* Position of bstop in the file */
+ int (*refill)(struct fastbuf *); /* Get a buffer with new data */
+ void (*spout)(struct fastbuf *); /* Write buffer data to the file */
+ int (*seek)(struct fastbuf *, sh_off_t, int); /* Slow path for bseek(), buffer already flushed; returns success */
+ void (*close)(struct fastbuf *); /* Close the stream */
+ int (*config)(struct fastbuf *, uns, int); /* Configure the stream */
+ int can_overwrite_buffer; /* Can the buffer be altered? (see discussion above) 0=never, 1=temporarily, 2=permanently */
+};
+
+/* FastIO on files with several configurable back-ends */
+
+enum fb_type { /* Which back-end you want to use */
+ FB_STD, /* Standard buffered I/O */
+ FB_DIRECT, /* Direct I/O bypassing system caches (see fb-direct.c for a description) */
+ FB_MMAP /* Memory mapped files */
+};
+
+struct fb_params {
+ enum fb_type type;
+ uns buffer_size; /* 0 for default size */
+ uns keep_back_buf; /* FB_STD: optimize for bi-directional access */
+ uns read_ahead; /* FB_DIRECT options */
+ uns write_back;
+ struct asio_queue *asio;
+};
+
+struct cf_section;
+extern struct cf_section fbpar_cf;
+extern struct fb_params fbpar_def;
+
+struct fastbuf *bopen_file(const char *name, int mode, struct fb_params *params); /* Use params==NULL for defaults */
+struct fastbuf *bopen_file_try(const char *name, int mode, struct fb_params *params);
+struct fastbuf *bopen_tmp_file(struct fb_params *params);
+struct fastbuf *bopen_fd(int fd, struct fb_params *params);
+
+/* FastIO on standard files (shortcuts for FB_STD) */
+
+struct fastbuf *bopen(const char *name, uns mode, uns buflen);
+struct fastbuf *bopen_try(const char *name, uns mode, uns buflen);
+struct fastbuf *bopen_tmp(uns buflen);
+struct fastbuf *bfdopen(int fd, uns buflen);
+struct fastbuf *bfdopen_shared(int fd, uns buflen);
+void bfilesync(struct fastbuf *b);
+
+/* Temporary files */
+
+#define TEMP_FILE_NAME_LEN 256
+void temp_file_name(char *name);
+void bfix_tmp_file(struct fastbuf *fb, const char *name);
+
+/* Internal functions of some file back-ends */
+
+struct fastbuf *bfdopen_internal(int fd, const char *name, uns buflen);
+struct fastbuf *bfmmopen_internal(int fd, const char *name, uns mode);
+
+extern uns fbdir_cheat;
+struct asio_queue;
+struct fastbuf *fbdir_open_fd_internal(int fd, const char *name, struct asio_queue *io_queue, uns buffer_size, uns read_ahead, uns write_back);
+
+void bclose_file_helper(struct fastbuf *f, int fd, int is_temp_file);
+
+/* FastIO on in-memory streams */
+
+struct fastbuf *fbmem_create(uns blocksize); /* Create stream and return its writing fastbuf */
+struct fastbuf *fbmem_clone_read(struct fastbuf *); /* Create reading fastbuf */
+
+/* FastI on file descriptors with limit */
+
+struct fastbuf *bopen_limited_fd(int fd, uns bufsize, uns limit);
+
+/* FastIO on static buffers */
+
+void fbbuf_init_read(struct fastbuf *f, byte *buffer, uns size, uns can_overwrite);
+void fbbuf_init_write(struct fastbuf *f, byte *buffer, uns size);
+static inline uns
+fbbuf_count_written(struct fastbuf *f)
+{
+ return f->bptr - f->bstop;
+}
+
+/* FastIO on recyclable growing buffers */
+
+struct fastbuf *fbgrow_create(unsigned basic_size);
+void fbgrow_reset(struct fastbuf *b); /* Reset stream and prepare for writing */
+void fbgrow_rewind(struct fastbuf *b); /* Prepare for reading */
+
+/* FastO on memory pools */
+
+struct mempool;
+struct fbpool {
+ struct fastbuf fb;
+ struct mempool *mp;