зеркало из https://github.com/microsoft/git.git
Added automatic index generation to fast-import.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce
Родитель
db5e523fdd
Коммит
8bcce30126
182
fast-import.c
182
fast-import.c
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@ -8,11 +8,75 @@
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static int max_depth = 10;
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static unsigned long object_count;
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static unsigned long duplicate_count;
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static unsigned long packoff;
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static unsigned long overflow_count;
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static int packfd;
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static int current_depth;
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static void *lastdat;
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static unsigned long lastdatlen;
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static unsigned char lastsha1[20];
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static unsigned char packsha1[20];
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struct object_entry
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{
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struct object_entry *next;
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unsigned long offset;
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unsigned char sha1[20];
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};
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struct overflow_object_entry
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{
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struct overflow_object_entry *next;
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struct object_entry oe;
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};
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struct object_entry *pool_start;
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struct object_entry *pool_next;
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struct object_entry *pool_end;
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struct overflow_object_entry *overflow;
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struct object_entry *table[1 << 16];
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static struct object_entry* new_object(unsigned char *sha1)
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{
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if (pool_next != pool_end) {
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struct object_entry *e = pool_next++;
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memcpy(e->sha1, sha1, sizeof(e->sha1));
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return e;
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} else {
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struct overflow_object_entry *e;
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e = xmalloc(sizeof(struct overflow_object_entry));
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e->next = overflow;
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memcpy(e->oe.sha1, sha1, sizeof(e->oe.sha1));
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overflow = e;
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overflow_count++;
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return &e->oe;
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}
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}
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static struct object_entry* insert_object(unsigned char *sha1)
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{
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unsigned int h = sha1[0] << 8 | sha1[1];
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struct object_entry *e = table[h];
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struct object_entry *p = 0;
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while (e) {
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if (!memcmp(sha1, e->sha1, sizeof(e->sha1)))
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return e;
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p = e;
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e = e->next;
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}
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e = new_object(sha1);
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e->next = 0;
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e->offset = 0;
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if (p)
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p->next = e;
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else
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table[h] = e;
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return e;
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}
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static ssize_t yread(int fd, void *buffer, size_t length)
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{
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@ -66,7 +130,7 @@ static unsigned long encode_header(enum object_type type, unsigned long size, un
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return n;
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}
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static void write_blob (void *dat, unsigned long datlen)
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static void write_blob(void *dat, unsigned long datlen)
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{
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z_stream s;
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void *out, *delta;
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@ -92,6 +156,7 @@ static void write_blob (void *dat, unsigned long datlen)
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die("Can't write object header: %s", strerror(errno));
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if (ywrite(packfd, lastsha1, sizeof(lastsha1)) != sizeof(lastsha1))
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die("Can't write object base: %s", strerror(errno));
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packoff += hdrlen + sizeof(lastsha1);
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} else {
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current_depth = 0;
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s.next_in = dat;
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@ -99,6 +164,7 @@ static void write_blob (void *dat, unsigned long datlen)
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hdrlen = encode_header(OBJ_BLOB, datlen, hdr);
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if (ywrite(packfd, hdr, hdrlen) != hdrlen)
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die("Can't write object header: %s", strerror(errno));
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packoff += hdrlen;
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}
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s.avail_out = deflateBound(&s, s.avail_in);
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@ -109,13 +175,14 @@ static void write_blob (void *dat, unsigned long datlen)
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if (ywrite(packfd, out, s.total_out) != s.total_out)
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die("Failed writing compressed data %s", strerror(errno));
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packoff += s.total_out;
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free(out);
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if (delta)
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free(delta);
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}
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static void init_pack_header ()
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static void init_pack_header()
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{
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const char* magic = "PACK";
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unsigned long version = 2;
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@ -129,13 +196,13 @@ static void init_pack_header ()
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die("Can't write pack version: %s", strerror(errno));
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if (ywrite(packfd, &zero, 4) != 4)
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die("Can't write 0 object count: %s", strerror(errno));
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packoff = 4 * 3;
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}
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static void fixup_header_footer ()
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static void fixup_header_footer()
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{
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SHA_CTX c;
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char hdr[8];
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unsigned char sha1[20];
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unsigned long cnt;
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char *buf;
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size_t n;
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@ -148,7 +215,6 @@ static void fixup_header_footer ()
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die("Failed reading header: %s", strerror(errno));
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SHA1_Update(&c, hdr, 8);
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fprintf(stderr, "%lu objects\n", object_count);
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cnt = htonl(object_count);
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SHA1_Update(&c, &cnt, 4);
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if (ywrite(packfd, &cnt, 4) != 4)
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@ -163,16 +229,81 @@ fprintf(stderr, "%lu objects\n", object_count);
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}
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free(buf);
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SHA1_Final(sha1, &c);
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if (ywrite(packfd, sha1, sizeof(sha1)) != sizeof(sha1))
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SHA1_Final(packsha1, &c);
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if (ywrite(packfd, packsha1, sizeof(packsha1)) != sizeof(packsha1))
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die("Failed writing pack checksum: %s", strerror(errno));
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}
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int main (int argc, const char **argv)
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static int oecmp (const void *_a, const void *_b)
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{
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packfd = open(argv[1], O_RDWR|O_CREAT|O_TRUNC, 0666);
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struct object_entry *a = *((struct object_entry**)_a);
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struct object_entry *b = *((struct object_entry**)_b);
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return memcmp(a->sha1, b->sha1, sizeof(a->sha1));
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}
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static void write_index(const char *idx_name)
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{
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struct sha1file *f;
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struct object_entry **idx, **c, **last;
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struct object_entry *e;
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struct overflow_object_entry *o;
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unsigned int array[256];
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int i;
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/* Build the sorted table of object IDs. */
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idx = xmalloc(object_count * sizeof(struct object_entry*));
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c = idx;
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for (e = pool_start; e != pool_next; e++)
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*c++ = e;
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for (o = overflow; o; o = o->next)
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*c++ = &o->oe;
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last = idx + object_count;
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qsort(idx, object_count, sizeof(struct object_entry*), oecmp);
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/* Generate the fan-out array. */
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c = idx;
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for (i = 0; i < 256; i++) {
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struct object_entry **next = c;;
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while (next < last) {
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if ((*next)->sha1[0] != i)
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break;
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next++;
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}
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array[i] = htonl(next - idx);
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c = next;
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}
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f = sha1create("%s", idx_name);
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sha1write(f, array, 256 * sizeof(int));
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for (c = idx; c != last; c++) {
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unsigned int offset = htonl((*c)->offset);
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sha1write(f, &offset, 4);
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sha1write(f, (*c)->sha1, sizeof((*c)->sha1));
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}
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sha1write(f, packsha1, sizeof(packsha1));
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sha1close(f, NULL, 1);
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free(idx);
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}
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int main(int argc, const char **argv)
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{
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const char *base_name = argv[1];
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int est_obj_cnt = atoi(argv[2]);
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char *pack_name;
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char *idx_name;
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pack_name = xmalloc(strlen(base_name) + 6);
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sprintf(pack_name, "%s.pack", base_name);
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idx_name = xmalloc(strlen(base_name) + 5);
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sprintf(idx_name, "%s.idx", base_name);
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packfd = open(pack_name, O_RDWR|O_CREAT|O_TRUNC, 0666);
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if (packfd < 0)
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die("Can't create pack file %s: %s", argv[1], strerror(errno));
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die("Can't create pack file %s: %s", pack_name, strerror(errno));
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pool_start = xmalloc(est_obj_cnt * sizeof(struct object_entry));
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pool_next = pool_start;
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pool_end = pool_start + est_obj_cnt;
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init_pack_header();
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for (;;) {
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@ -182,8 +313,10 @@ int main (int argc, const char **argv)
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char hdr[128];
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unsigned char sha1[20];
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SHA_CTX c;
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struct object_entry *e;
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if (yread(0, &datlen, 4) != 4)
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break;
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dat = xmalloc(datlen);
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@ -196,19 +329,30 @@ int main (int argc, const char **argv)
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SHA1_Update(&c, dat, datlen);
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SHA1_Final(sha1, &c);
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write_blob(dat, datlen);
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object_count++;
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printf("%s\n", sha1_to_hex(sha1));
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fflush(stdout);
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e = insert_object(sha1);
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if (!e->offset) {
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e->offset = packoff;
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write_blob(dat, datlen);
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object_count++;
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printf("%s\n", sha1_to_hex(sha1));
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fflush(stdout);
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if (lastdat)
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free(lastdat);
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lastdat = dat;
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lastdatlen = datlen;
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memcpy(lastsha1, sha1, sizeof(sha1));
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if (lastdat)
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free(lastdat);
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lastdat = dat;
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lastdatlen = datlen;
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memcpy(lastsha1, sha1, sizeof(sha1));
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} else {
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duplicate_count++;
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free(dat);
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}
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}
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fixup_header_footer();
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close(packfd);
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write_index(idx_name);
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fprintf(stderr, "%lu objects, %lu duplicates, %lu pool overflow\n",
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object_count, duplicate_count, overflow_count);
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return 0;
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}
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