[PATCH] write_sha1_to_fd()

Add write_sha1_to_fd(), which writes an object to a file descriptor. This
includes support for unpacking it and recompressing it.

Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/cache.h b/cache.h
index 84d43d3..4d2bde5 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -185,6 +185,7 @@ extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned l
 extern int read_tree(void *buffer, unsigned long size, int stage);
 
 extern int write_sha1_from_fd(const unsigned char *sha1, int fd);
+extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 
 extern int has_sha1_pack(const unsigned char *sha1);
 extern int has_sha1_file(const unsigned char *sha1);

diff --git a/sha1_file.c b/sha1_file.c
index b2914dd..b13578b 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1221,6 +1221,65 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
        return 0;
 }
 
+int write_sha1_to_fd(int fd, const unsigned char *sha1)
+{
+       ssize_t size;
+       unsigned long objsize;
+       int posn = 0;
+       char *buf = map_sha1_file_internal(sha1, &objsize, 0);
+       z_stream stream;
+       if (!buf) {
+               unsigned char *unpacked;
+               unsigned long len;
+               char type[20];
+               char hdr[50];
+               int hdrlen;
+               // need to unpack and recompress it by itself
+               unpacked = read_packed_sha1(sha1, type, &len);
+
+               hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
+
+               /* Set it up */
+               memset(&stream, 0, sizeof(stream));
+               deflateInit(&stream, Z_BEST_COMPRESSION);
+               size = deflateBound(&stream, len + hdrlen);
+               buf = xmalloc(size);
+
+               /* Compress it */
+               stream.next_out = buf;
+               stream.avail_out = size;
+               
+               /* First header.. */
+               stream.next_in = hdr;
+               stream.avail_in = hdrlen;
+               while (deflate(&stream, 0) == Z_OK)
+                       /* nothing */;
+
+               /* Then the data itself.. */
+               stream.next_in = unpacked;
+               stream.avail_in = len;
+               while (deflate(&stream, Z_FINISH) == Z_OK)
+                       /* nothing */;
+               deflateEnd(&stream);
+               
+               objsize = stream.total_out;
+       }
+
+       do {
+               size = write(fd, buf + posn, objsize - posn);
+               if (size <= 0) {
+                       if (!size) {
+                               fprintf(stderr, "write closed");
+                       } else {
+                               perror("write ");
+                       }
+                       return -1;
+               }
+               posn += size;
+       } while (posn < objsize);
+       return 0;
+}
+
 int write_sha1_from_fd(const unsigned char *sha1, int fd)
 {
        char *filename = sha1_file_name(sha1);

diff --git a/ssh-push.c b/ssh-push.c
index 090d6f9..aac70af 100644 (file)
--- a/ssh-push.c
+++ b/ssh-push.c
@@ -7,13 +7,13 @@
 static unsigned char local_version = 1;
 static unsigned char remote_version = 0;
 
+static int verbose = 0;
+
 static int serve_object(int fd_in, int fd_out) {
        ssize_t size;
-       int posn = 0;
        unsigned char sha1[20];
-       unsigned long objsize;
-       void *buf;
        signed char remote;
+       int posn = 0;
        do {
                size = read(fd_in, sha1 + posn, 20 - posn);
                if (size < 0) {
@@ -25,12 +25,12 @@ static int serve_object(int fd_in, int fd_out) {
                posn += size;
        } while (posn < 20);
        
-       /* fprintf(stderr, "Serving %s\n", sha1_to_hex(sha1)); */
+       if (verbose)
+               fprintf(stderr, "Serving %s\n", sha1_to_hex(sha1));
+
        remote = 0;
        
-       buf = map_sha1_file(sha1, &objsize);
-       
-       if (!buf) {
+       if (!has_sha1_file(sha1)) {
                fprintf(stderr, "git-ssh-push: could not find %s\n", 
                        sha1_to_hex(sha1));
                remote = -1;
@@ -41,20 +41,7 @@ static int serve_object(int fd_in, int fd_out) {
        if (remote < 0)
                return 0;
        
-       posn = 0;
-       do {
-               size = write(fd_out, buf + posn, objsize - posn);
-               if (size <= 0) {
-                       if (!size) {
-                               fprintf(stderr, "git-ssh-push: write closed");
-                       } else {
-                               perror("git-ssh-push: write ");
-                       }
-                       return -1;
-               }
-               posn += size;
-       } while (posn < objsize);
-       return 0;
+       return write_sha1_to_fd(fd_out, sha1);
 }
 
 static int serve_version(int fd_in, int fd_out)
@@ -76,6 +63,10 @@ static int serve_ref(int fd_in, int fd_out)
                        return -1;
                posn++;
        } while (ref[posn - 1]);
+
+       if (verbose)
+               fprintf(stderr, "Serving %s\n", ref);
+
        if (get_ref_sha1(ref, sha1))
                remote = -1;
        write(fd_out, &remote, 1);