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82 lines
3.0 KiB
82 lines
3.0 KiB
#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(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_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3))); |
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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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* 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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#define DEFAULT_PACKET_MAX 1000 |
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#define LARGE_PACKET_MAX 65520 |
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extern char packet_buffer[LARGE_PACKET_MAX]; |
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#endif
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