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/*
* libdpkg - Debian packaging suite library routines
* buffer.h - buffer I/O handling routines
*
* Copyright © 1999, 2000 Wichert Akkerman <wakkerma@debian.org>
* Copyright © 2000-2003 Adam Heath <doogie@debian.org>
* Copyright © 2005 Scott James Remnant
* Copyright © 2008, 2009 Guillem Jover <guillem@debian.org>
*
* This 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,
* or (at your option) any later version.
*
* This 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 dpkg; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef DPKG_BUFFER_H
#define DPKG_BUFFER_H
#include <sys/types.h>
#include <dpkg/macros.h>
DPKG_BEGIN_DECLS
#define BUFFER_WRITE_BUF 0
#define BUFFER_WRITE_VBUF 1
#define BUFFER_WRITE_FD 2
#define BUFFER_WRITE_NULL 3
#define BUFFER_WRITE_STREAM 4
#define BUFFER_WRITE_MD5 5
#define BUFFER_READ_FD 0
#define BUFFER_READ_STREAM 1
typedef struct buffer_data *buffer_data_t;
typedef union buffer_arg {
void *ptr;
int i;
} buffer_arg;
struct buffer_data {
buffer_arg data;
int type;
};
#if HAVE_C99
# define fd_md5(fd, hash, limit, ...) \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, hash, BUFFER_WRITE_MD5, \
limit, __VA_ARGS__)
# define stream_md5(file, hash, limit, ...) \
buffer_copy_PtrPtr(file, BUFFER_READ_STREAM, hash, BUFFER_WRITE_MD5, \
limit, __VA_ARGS__)
# define fd_fd_copy(fd1, fd2, limit, ...) \
buffer_copy_IntInt(fd1, BUFFER_READ_FD, fd2, BUFFER_WRITE_FD, \
limit, __VA_ARGS__)
# define fd_buf_copy(fd, buf, limit, ...) \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, buf, BUFFER_WRITE_BUF, \
limit, __VA_ARGS__)
# define fd_vbuf_copy(fd, buf, limit, ...) \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, buf, BUFFER_WRITE_VBUF, \
limit, __VA_ARGS__)
# define fd_null_copy(fd, limit, ...) \
if (lseek(fd, limit, SEEK_CUR) == -1) { \
if (errno != ESPIPE) \
ohshite(__VA_ARGS__); \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, \
NULL, BUFFER_WRITE_NULL, \
limit, __VA_ARGS__); \
}
# define stream_null_copy(file, limit, ...) \
if (fseek(file, limit, SEEK_CUR) == -1) { \
if (errno != EBADF) \
ohshite(__VA_ARGS__); \
buffer_copy_PtrPtr(file, BUFFER_READ_STREAM, \
NULL, BUFFER_WRITE_NULL, \
limit, __VA_ARGS__); \
}
# define stream_fd_copy(file, fd, limit, ...) \
buffer_copy_PtrInt(file, BUFFER_READ_STREAM, fd, BUFFER_WRITE_FD, \
limit, __VA_ARGS__)
#else /* HAVE_C99 */
# define fd_md5(fd, hash, limit, desc...) \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, hash, BUFFER_WRITE_MD5, \
limit, desc)
# define stream_md5(file, hash, limit, desc...) \
buffer_copy_PtrPtr(file, BUFFER_READ_STREAM, hash, BUFFER_WRITE_MD5, \
limit, desc)
# define fd_fd_copy(fd1, fd2, limit, desc...) \
buffer_copy_IntInt(fd1, BUFFER_READ_FD, fd2, BUFFER_WRITE_FD, \
limit, desc)
# define fd_buf_copy(fd, buf, limit, desc...) \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, buf, BUFFER_WRITE_BUF, \
limit, desc)
# define fd_vbuf_copy(fd, buf, limit, desc...) \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, buf, BUFFER_WRITE_VBUF, \
limit, desc)
# define fd_null_copy(fd, limit, desc...) \
if (lseek(fd, limit, SEEK_CUR) == -1) { \
if (errno != ESPIPE) \
ohshite(desc); \
buffer_copy_IntPtr(fd, BUFFER_READ_FD, \
NULL, BUFFER_WRITE_NULL, \
limit, desc); \
}
# define stream_null_copy(file, limit, desc...) \
if (fseek(file, limit, SEEK_CUR) == -1) { \
if (errno != EBADF) \
ohshite(desc); \
buffer_copy_PtrPtr(file, BUFFER_READ_STREAM, \
NULL, BUFFER_WRITE_NULL, \
limit, desc); \
}
# define stream_fd_copy(file, fd, limit, desc...)\
buffer_copy_PtrInt(file, BUFFER_READ_STREAM, fd, BUFFER_WRITE_FD, \
limit, desc)
#endif /* HAVE_C99 */
off_t buffer_copy_PtrInt(void *p, int typeIn, int i, int typeOut,
off_t limit, const char *desc,
...) DPKG_ATTR_PRINTF(6);
off_t buffer_copy_PtrPtr(void *p1, int typeIn, void *p2, int typeOut,
off_t limit, const char *desc,
...) DPKG_ATTR_PRINTF(6);
off_t buffer_copy_IntPtr(int i, int typeIn, void *p, int typeOut,
off_t limit, const char *desc,
...) DPKG_ATTR_PRINTF(6);
off_t buffer_copy_IntInt(int i1, int typeIn, int i2, int typeOut,
off_t limit, const char *desc,
...) DPKG_ATTR_PRINTF(6);
off_t buffer_write(buffer_data_t data, void *buf,
off_t length, const char *desc);
off_t buffer_read(buffer_data_t data, void *buf,
off_t length, const char *desc);
off_t buffer_init(buffer_data_t read_data, buffer_data_t write_data);
off_t buffer_done(buffer_data_t read_data, buffer_data_t write_data);
off_t buffer_copy(buffer_data_t read_data, buffer_data_t write_data,
off_t limit, const char *desc);
DPKG_END_DECLS
#endif /* DPKG_BUFFER_H */
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