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f3a3214e LT |
1 | #ifndef PKTLINE_H |
2 | #define PKTLINE_H | |
3 | ||
07d68930 | 4 | #include "git-compat-util.h" |
f5615d24 | 5 | #include "strbuf.h" |
07d68930 | 6 | |
f3a3214e | 7 | /* |
e1485428 JK |
8 | * Write a packetized stream, where each line is preceded by |
9 | * its length (including the header) as a 4-byte hex number. | |
10 | * A length of 'zero' means end of stream (and a length of 1-3 | |
11 | * would be an error). | |
12 | * | |
13 | * This is all pretty stupid, but we use this packetized line | |
14 | * format to make a streaming format possible without ever | |
15 | * over-running the read buffers. That way we'll never read | |
16 | * into what might be the pack data (which should go to another | |
17 | * process entirely). | |
18 | * | |
19 | * The writing side could use stdio, but since the reading | |
20 | * side can't, we stay with pure read/write interfaces. | |
f3a3214e LT |
21 | */ |
22 | void packet_flush(int fd); | |
81c634e9 | 23 | void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3))); |
f5615d24 | 24 | void packet_buf_flush(struct strbuf *buf); |
5d2124b3 | 25 | void packet_write(int fd_out, const char *buf, size_t size); |
f5615d24 | 26 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3))); |
038ce90f | 27 | int packet_flush_gently(int fd); |
70428d1a | 28 | int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3))); |
bb643d8b LS |
29 | int write_packetized_from_fd(int fd_in, int fd_out); |
30 | int write_packetized_from_buf(const char *src_in, size_t len, int fd_out); | |
f3a3214e | 31 | |
03809429 | 32 | /* |
4981fe75 JK |
33 | * Read a packetized line into the buffer, which must be at least size bytes |
34 | * long. The return value specifies the number of bytes read into the buffer. | |
35 | * | |
01689909 JL |
36 | * If src_buffer and *src_buffer are not NULL, it should point to a buffer |
37 | * containing the packet data to parse, of at least *src_len bytes. After the | |
38 | * function returns, src_buf will be incremented and src_len decremented by the | |
39 | * number of bytes consumed. | |
4981fe75 JK |
40 | * |
41 | * If src_buffer (or *src_buffer) is NULL, then data is read from the | |
42 | * descriptor "fd". | |
03809429 JK |
43 | * |
44 | * If options does not contain PACKET_READ_GENTLE_ON_EOF, we will die under any | |
45 | * of the following conditions: | |
46 | * | |
47 | * 1. Read error from descriptor. | |
48 | * | |
49 | * 2. Protocol error from the remote (e.g., bogus length characters). | |
50 | * | |
51 | * 3. Receiving a packet larger than "size" bytes. | |
52 | * | |
53 | * 4. Truncated output from the remote (e.g., we expected a packet but got | |
54 | * EOF, or we got a partial packet followed by EOF). | |
55 | * | |
56 | * If options does contain PACKET_READ_GENTLE_ON_EOF, we will not die on | |
57 | * condition 4 (truncated input), but instead return -1. However, we will still | |
58 | * die for the other 3 conditions. | |
819b929d JK |
59 | * |
60 | * If options contains PACKET_READ_CHOMP_NEWLINE, a trailing newline (if | |
61 | * present) is removed from the buffer before returning. | |
03809429 JK |
62 | */ |
63 | #define PACKET_READ_GENTLE_ON_EOF (1u<<0) | |
819b929d | 64 | #define PACKET_READ_CHOMP_NEWLINE (1u<<1) |
4981fe75 JK |
65 | int packet_read(int fd, char **src_buffer, size_t *src_len, char |
66 | *buffer, unsigned size, int options); | |
03809429 | 67 | |
819b929d JK |
68 | /* |
69 | * Convenience wrapper for packet_read that is not gentle, and sets the | |
74543a04 JK |
70 | * CHOMP_NEWLINE option. The return value is NULL for a flush packet, |
71 | * and otherwise points to a static buffer (that may be overwritten by | |
72 | * subsequent calls). If the size parameter is not NULL, the length of the | |
73 | * packet is written to it. | |
819b929d | 74 | */ |
74543a04 JK |
75 | char *packet_read_line(int fd, int *size); |
76 | ||
825b9226 BP |
77 | /* |
78 | * Convenience wrapper for packet_read that sets the PACKET_READ_GENTLE_ON_EOF | |
79 | * and CHOMP_NEWLINE options. The return value specifies the number of bytes | |
80 | * read into the buffer or -1 on truncated input. If the *dst_line parameter | |
81 | * is not NULL it will return NULL for a flush packet or when the number of | |
82 | * bytes copied is zero and otherwise points to a static buffer (that may be | |
83 | * overwritten by subsequent calls). If the size parameter is not NULL, the | |
84 | * length of the packet is written to it. | |
85 | */ | |
86 | int packet_read_line_gently(int fd, int *size, char **dst_line); | |
87 | ||
4981fe75 JK |
88 | /* |
89 | * Same as packet_read_line, but read from a buf rather than a descriptor; | |
90 | * see packet_read for details on how src_* is used. | |
91 | */ | |
92 | char *packet_read_line_buf(char **src_buf, size_t *src_len, int *size); | |
03809429 | 93 | |
bb643d8b LS |
94 | /* |
95 | * Reads a stream of variable sized packets until a flush packet is detected. | |
96 | */ | |
97 | ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out); | |
98 | ||
047ec602 JK |
99 | #define DEFAULT_PACKET_MAX 1000 |
100 | #define LARGE_PACKET_MAX 65520 | |
bb643d8b | 101 | #define LARGE_PACKET_DATA_MAX (LARGE_PACKET_MAX - 4) |
74543a04 | 102 | extern char packet_buffer[LARGE_PACKET_MAX]; |
047ec602 | 103 | |
f3a3214e | 104 | #endif |