From: larsxschneider@gmail.com
To: git@vger.kernel.org
Cc: gitster@pobox.com, jnareb@gmail.com, peff@peff.net,
Lars Schneider <larsxschneider@gmail.com>
Subject: [PATCH v10 10/14] pkt-line: add functions to read/write flush terminated packet streams
Date: Sat, 8 Oct 2016 13:25:26 +0200 [thread overview]
Message-ID: <20161008112530.15506-11-larsxschneider@gmail.com> (raw)
In-Reply-To: <20161008112530.15506-1-larsxschneider@gmail.com>
From: Lars Schneider <larsxschneider@gmail.com>
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>
---
pkt-line.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
pkt-line.h | 8 +++++++
2 files changed, 80 insertions(+)
diff --git a/pkt-line.c b/pkt-line.c
index dca5a64..0b5125f 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -197,6 +197,46 @@ void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
va_end(args);
}
+int write_packetized_from_fd(int fd_in, int fd_out)
+{
+ static char buf[LARGE_PACKET_DATA_MAX];
+ int err = 0;
+ ssize_t bytes_to_write;
+
+ while (!err) {
+ bytes_to_write = xread(fd_in, buf, sizeof(buf));
+ if (bytes_to_write < 0)
+ return COPY_READ_ERROR;
+ if (bytes_to_write == 0)
+ break;
+ err = packet_write_gently(fd_out, buf, bytes_to_write);
+ }
+ if (!err)
+ err = packet_flush_gently(fd_out);
+ return err;
+}
+
+int write_packetized_from_buf(const char *src_in, size_t len, int fd_out)
+{
+ int err = 0;
+ size_t bytes_written = 0;
+ size_t bytes_to_write;
+
+ while (!err) {
+ if ((len - bytes_written) > LARGE_PACKET_DATA_MAX)
+ bytes_to_write = LARGE_PACKET_DATA_MAX;
+ else
+ bytes_to_write = len - bytes_written;
+ if (bytes_to_write == 0)
+ break;
+ err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
+ bytes_written += bytes_to_write;
+ }
+ if (!err)
+ err = packet_flush_gently(fd_out);
+ return err;
+}
+
static int get_packet_data(int fd, char **src_buf, size_t *src_size,
void *dst, unsigned size, int options)
{
@@ -306,3 +346,35 @@ char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len)
{
return packet_read_line_generic(-1, src, src_len, dst_len);
}
+
+ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out)
+{
+ int packet_len;
+
+ size_t orig_len = sb_out->len;
+ size_t orig_alloc = sb_out->alloc;
+
+ for (;;) {
+ strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
+ packet_len = packet_read(fd_in, NULL, NULL,
+ /* strbuf_grow() above always allocates one extra byte to
+ * store a '\0' at the end of the string. packet_read()
+ * writes a '\0' extra byte at the end, too. Let it know
+ * that there is already room for the extra byte.
+ */
+ sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1,
+ PACKET_READ_GENTLE_ON_EOF);
+ if (packet_len <= 0)
+ break;
+ sb_out->len += packet_len;
+ }
+
+ if (packet_len < 0) {
+ if (orig_alloc == 0)
+ strbuf_release(sb_out);
+ else
+ strbuf_setlen(sb_out, orig_len);
+ return packet_len;
+ }
+ return sb_out->len - orig_len;
+}
diff --git a/pkt-line.h b/pkt-line.h
index 3fa0899..18eac64 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -25,6 +25,8 @@ 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
@@ -77,8 +79,14 @@ char *packet_read_line(int fd, int *size);
*/
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
--
2.10.0
next prev parent reply other threads:[~2016-10-08 11:26 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-08 11:25 [PATCH v10 00/14] Git filter protocol larsxschneider
2016-10-08 11:25 ` [PATCH v10 01/14] convert: quote filter names in error messages larsxschneider
2016-10-08 11:25 ` [PATCH v10 02/14] convert: modernize tests larsxschneider
2016-10-08 11:25 ` [PATCH v10 03/14] run-command: move check_pipe() from write_or_die to run_command larsxschneider
2016-10-08 11:25 ` [PATCH v10 04/14] run-command: add clean_on_exit_handler larsxschneider
2016-10-11 12:12 ` Johannes Schindelin
2016-10-15 15:02 ` Lars Schneider
2016-10-16 8:03 ` Johannes Schindelin
2016-10-16 21:57 ` Lars Schneider
2016-10-08 11:25 ` [PATCH v10 05/14] pkt-line: rename packet_write() to packet_write_fmt() larsxschneider
2016-10-08 11:25 ` [PATCH v10 06/14] pkt-line: extract set_packet_header() larsxschneider
2016-10-08 11:25 ` [PATCH v10 07/14] pkt-line: add packet_write_fmt_gently() larsxschneider
2016-10-08 11:25 ` [PATCH v10 08/14] pkt-line: add packet_flush_gently() larsxschneider
2016-10-08 11:25 ` [PATCH v10 09/14] pkt-line: add packet_write_gently() larsxschneider
2016-10-08 11:25 ` larsxschneider [this message]
2016-10-08 11:25 ` [PATCH v10 11/14] convert: make apply_filter() adhere to standard Git error handling larsxschneider
2016-10-08 11:25 ` [PATCH v10 12/14] convert: prepare filter.<driver>.process option larsxschneider
2016-10-08 11:25 ` [PATCH v10 13/14] convert: add " larsxschneider
2016-10-08 23:06 ` Jakub Narębski
2016-10-09 5:32 ` Torsten Bögershausen
2016-10-11 15:29 ` Lars Schneider
2016-10-11 22:26 ` Lars Schneider
2016-10-12 10:54 ` Jakub Narębski
2016-10-15 14:45 ` Lars Schneider
2016-10-15 17:41 ` Jeff King
2016-10-15 19:42 ` Jakub Narębski
2016-10-10 19:58 ` Junio C Hamano
2016-10-11 8:11 ` Lars Schneider
2016-10-11 10:09 ` Torsten Bögershausen
2016-10-16 23:13 ` Lars Schneider
2016-10-17 17:05 ` Junio C Hamano
2016-10-08 11:25 ` [PATCH v10 14/14] contrib/long-running-filter: add long running filter example larsxschneider
2016-10-09 5:42 ` Torsten Bögershausen
2016-10-15 14:47 ` Lars Schneider
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