mirror of
https://github.com/git/git.git
synced 2024-11-24 02:17:02 +08:00
bb643d8bf8
write_packetized_from_fd() and write_packetized_from_buf() write a stream of packets. All content packets use the maximal packet size except for the last one. After the last content packet a `flush` control packet is written. read_packetized_to_strbuf() reads arbitrary sized packets until it detects a `flush` packet. Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
93 lines
3.5 KiB
C
93 lines
3.5 KiB
C
#ifndef PKTLINE_H
|
|
#define PKTLINE_H
|
|
|
|
#include "git-compat-util.h"
|
|
#include "strbuf.h"
|
|
|
|
/*
|
|
* Write a packetized stream, where each line is preceded by
|
|
* its length (including the header) as a 4-byte hex number.
|
|
* A length of 'zero' means end of stream (and a length of 1-3
|
|
* would be an error).
|
|
*
|
|
* This is all pretty stupid, but we use this packetized line
|
|
* format to make a streaming format possible without ever
|
|
* over-running the read buffers. That way we'll never read
|
|
* into what might be the pack data (which should go to another
|
|
* process entirely).
|
|
*
|
|
* The writing side could use stdio, but since the reading
|
|
* side can't, we stay with pure read/write interfaces.
|
|
*/
|
|
void packet_flush(int fd);
|
|
void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
|
|
void packet_buf_flush(struct strbuf *buf);
|
|
void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
|
|
int packet_flush_gently(int fd);
|
|
int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
|
|
int write_packetized_from_fd(int fd_in, int fd_out);
|
|
int write_packetized_from_buf(const char *src_in, size_t len, int fd_out);
|
|
|
|
/*
|
|
* Read a packetized line into the buffer, which must be at least size bytes
|
|
* long. The return value specifies the number of bytes read into the buffer.
|
|
*
|
|
* If src_buffer and *src_buffer are not NULL, it should point to a buffer
|
|
* containing the packet data to parse, of at least *src_len bytes. After the
|
|
* function returns, src_buf will be incremented and src_len decremented by the
|
|
* number of bytes consumed.
|
|
*
|
|
* If src_buffer (or *src_buffer) is NULL, then data is read from the
|
|
* descriptor "fd".
|
|
*
|
|
* If options does not contain PACKET_READ_GENTLE_ON_EOF, we will die under any
|
|
* of the following conditions:
|
|
*
|
|
* 1. Read error from descriptor.
|
|
*
|
|
* 2. Protocol error from the remote (e.g., bogus length characters).
|
|
*
|
|
* 3. Receiving a packet larger than "size" bytes.
|
|
*
|
|
* 4. Truncated output from the remote (e.g., we expected a packet but got
|
|
* EOF, or we got a partial packet followed by EOF).
|
|
*
|
|
* If options does contain PACKET_READ_GENTLE_ON_EOF, we will not die on
|
|
* condition 4 (truncated input), but instead return -1. However, we will still
|
|
* die for the other 3 conditions.
|
|
*
|
|
* If options contains PACKET_READ_CHOMP_NEWLINE, a trailing newline (if
|
|
* present) is removed from the buffer before returning.
|
|
*/
|
|
#define PACKET_READ_GENTLE_ON_EOF (1u<<0)
|
|
#define PACKET_READ_CHOMP_NEWLINE (1u<<1)
|
|
int packet_read(int fd, char **src_buffer, size_t *src_len, char
|
|
*buffer, unsigned size, int options);
|
|
|
|
/*
|
|
* Convenience wrapper for packet_read that is not gentle, and sets the
|
|
* CHOMP_NEWLINE option. The return value is NULL for a flush packet,
|
|
* and otherwise points to a static buffer (that may be overwritten by
|
|
* subsequent calls). If the size parameter is not NULL, the length of the
|
|
* packet is written to it.
|
|
*/
|
|
char *packet_read_line(int fd, int *size);
|
|
|
|
/*
|
|
* Same as packet_read_line, but read from a buf rather than a descriptor;
|
|
* see packet_read for details on how src_* is used.
|
|
*/
|
|
char *packet_read_line_buf(char **src_buf, size_t *src_len, int *size);
|
|
|
|
/*
|
|
* Reads a stream of variable sized packets until a flush packet is detected.
|
|
*/
|
|
ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out);
|
|
|
|
#define DEFAULT_PACKET_MAX 1000
|
|
#define LARGE_PACKET_MAX 65520
|
|
#define LARGE_PACKET_DATA_MAX (LARGE_PACKET_MAX - 4)
|
|
extern char packet_buffer[LARGE_PACKET_MAX];
|
|
|
|
#endif
|