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/* Copyright 2007, 2008 Peter Klausler. See COPYING for license. */
#ifndef BUFFER_H
#define BUFFER_H
/* Gap buffers */
struct buffer;
struct buffer *buffer_create(char *path);
void buffer_destroy(struct buffer *);
size_t buffer_raw(struct buffer *, char **, position_t, size_t);
size_t buffer_get(struct buffer *, void *, position_t, size_t);
size_t buffer_delete(struct buffer *, position_t, size_t);
size_t buffer_insert(struct buffer *, const void *, position_t, size_t);
size_t buffer_move(struct buffer *dest, position_t,
struct buffer *src, position_t, size_t);
void buffer_snap(struct buffer *);
/* do *not* use directly; this definition is here
* just for the inline functions.
*/
struct buffer {
char *data;
size_t payload, mapped;
position_t gap;
fd_t fd;
char *path;
};
INLINE size_t buffer_bytes(struct buffer *buffer)
{
return buffer ? buffer->payload : 0;
}
INLINE size_t buffer_gap_bytes(struct buffer *buffer)
{
return buffer->mapped - buffer->payload;
}
INLINE int buffer_byte(struct buffer *buffer, size_t offset)
{
if (!buffer || offset >= buffer->payload)
return -1;
if (offset >= buffer->gap)
offset += buffer_gap_bytes(buffer);
return offset[(Byte_t *) buffer->data];
}
#endif
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