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5d2124b34a
Add a function which can be used to write the contents of an arbitrary buffer. This makes it easy to build up data in a buffer before writing the packet instead of formatting the entire contents of the packet using 'packet_write_fmt()'. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
105 lines
4.1 KiB
C
105 lines
4.1 KiB
C
#ifndef PKTLINE_H
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#define PKTLINE_H
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#include "git-compat-util.h"
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#include "strbuf.h"
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/*
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* Write a packetized stream, where each line is preceded by
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* its length (including the header) as a 4-byte hex number.
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* A length of 'zero' means end of stream (and a length of 1-3
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* would be an error).
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*
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* This is all pretty stupid, but we use this packetized line
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* format to make a streaming format possible without ever
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* over-running the read buffers. That way we'll never read
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* into what might be the pack data (which should go to another
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* process entirely).
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*
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* The writing side could use stdio, but since the reading
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* side can't, we stay with pure read/write interfaces.
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*/
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void packet_flush(int fd);
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void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
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void packet_buf_flush(struct strbuf *buf);
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void packet_write(int fd_out, const char *buf, size_t size);
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void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
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int packet_flush_gently(int fd);
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int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
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int write_packetized_from_fd(int fd_in, int fd_out);
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int write_packetized_from_buf(const char *src_in, size_t len, int fd_out);
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/*
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* Read a packetized line into the buffer, which must be at least size bytes
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* long. The return value specifies the number of bytes read into the buffer.
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*
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* If src_buffer and *src_buffer are not NULL, it should point to a buffer
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* containing the packet data to parse, of at least *src_len bytes. After the
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* function returns, src_buf will be incremented and src_len decremented by the
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* number of bytes consumed.
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*
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* If src_buffer (or *src_buffer) is NULL, then data is read from the
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* descriptor "fd".
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*
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* If options does not contain PACKET_READ_GENTLE_ON_EOF, we will die under any
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* of the following conditions:
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*
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* 1. Read error from descriptor.
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*
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* 2. Protocol error from the remote (e.g., bogus length characters).
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*
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* 3. Receiving a packet larger than "size" bytes.
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*
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* 4. Truncated output from the remote (e.g., we expected a packet but got
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* EOF, or we got a partial packet followed by EOF).
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*
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* If options does contain PACKET_READ_GENTLE_ON_EOF, we will not die on
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* condition 4 (truncated input), but instead return -1. However, we will still
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* die for the other 3 conditions.
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*
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* If options contains PACKET_READ_CHOMP_NEWLINE, a trailing newline (if
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* present) is removed from the buffer before returning.
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*/
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#define PACKET_READ_GENTLE_ON_EOF (1u<<0)
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#define PACKET_READ_CHOMP_NEWLINE (1u<<1)
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int packet_read(int fd, char **src_buffer, size_t *src_len, char
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*buffer, unsigned size, int options);
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/*
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* Convenience wrapper for packet_read that is not gentle, and sets the
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* CHOMP_NEWLINE option. The return value is NULL for a flush packet,
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* and otherwise points to a static buffer (that may be overwritten by
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* subsequent calls). If the size parameter is not NULL, the length of the
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* packet is written to it.
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*/
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char *packet_read_line(int fd, int *size);
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/*
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* Convenience wrapper for packet_read that sets the PACKET_READ_GENTLE_ON_EOF
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* and CHOMP_NEWLINE options. The return value specifies the number of bytes
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* read into the buffer or -1 on truncated input. If the *dst_line parameter
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* is not NULL it will return NULL for a flush packet or when the number of
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* bytes copied is zero and otherwise points to a static buffer (that may be
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* overwritten by subsequent calls). If the size parameter is not NULL, the
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* length of the packet is written to it.
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*/
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int packet_read_line_gently(int fd, int *size, char **dst_line);
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/*
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* Same as packet_read_line, but read from a buf rather than a descriptor;
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* see packet_read for details on how src_* is used.
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*/
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char *packet_read_line_buf(char **src_buf, size_t *src_len, int *size);
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/*
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* Reads a stream of variable sized packets until a flush packet is detected.
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*/
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ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out);
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#define DEFAULT_PACKET_MAX 1000
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#define LARGE_PACKET_MAX 65520
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#define LARGE_PACKET_DATA_MAX (LARGE_PACKET_MAX - 4)
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extern char packet_buffer[LARGE_PACKET_MAX];
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#endif
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