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#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(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)));
/*
* Read a packetized line from the descriptor into the buffer, which must be at
* least size bytes long. The return value specifies the number of bytes read
* into the buffer.
*
* 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.
*/
#define PACKET_READ_GENTLE_ON_EOF (1u<<0)
int packet_read(int fd, char *buffer, unsigned size, int options);
/* Historical convenience wrapper for packet_read that sets no options */
int packet_read_line(int fd, char *buffer, unsigned size);
int packet_get_line(struct strbuf *out, char **src_buf, size_t *src_len);
#endif
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