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And add a "convert-cache" program to convert from old-style to new-style.
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Linus Torvalds
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Apr 20, 2005
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| #include "cache.h" | ||
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| struct entry { | ||
| unsigned char old_sha1[20]; | ||
| unsigned char new_sha1[20]; | ||
| int converted; | ||
| }; | ||
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| #define MAXOBJECTS (1000000) | ||
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| static struct entry *convert[MAXOBJECTS]; | ||
| static int nr_convert; | ||
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| static struct entry * convert_entry(unsigned char *sha1); | ||
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| static struct entry *insert_new(unsigned char *sha1, int pos) | ||
| { | ||
| struct entry *new = malloc(sizeof(struct entry)); | ||
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| memset(new, 0, sizeof(*new)); | ||
| memcpy(new->old_sha1, sha1, 20); | ||
| memmove(convert + pos + 1, convert + pos, (nr_convert - pos) * sizeof(struct entry *)); | ||
| convert[pos] = new; | ||
| nr_convert++; | ||
| if (nr_convert == MAXOBJECTS) | ||
| die("you're kidding me - hit maximum object limit"); | ||
| return new; | ||
| } | ||
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| static struct entry *lookup_entry(unsigned char *sha1) | ||
| { | ||
| int low = 0, high = nr_convert; | ||
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| while (low < high) { | ||
| int next = (low + high) / 2; | ||
| struct entry *n = convert[next]; | ||
| int cmp = memcmp(sha1, n->old_sha1, 20); | ||
| if (!cmp) | ||
| return n; | ||
| if (cmp < 0) { | ||
| high = next; | ||
| continue; | ||
| } | ||
| low = next+1; | ||
| } | ||
| return insert_new(sha1, low); | ||
| } | ||
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| static void convert_blob(void *buffer, unsigned long size) | ||
| { | ||
| /* Nothing to do */ | ||
| } | ||
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| static void convert_binary_sha1(void *buffer) | ||
| { | ||
| struct entry *entry = convert_entry(buffer); | ||
| memcpy(buffer, entry->new_sha1, 20); | ||
| } | ||
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| static void convert_ascii_sha1(void *buffer) | ||
| { | ||
| unsigned char sha1[20]; | ||
| struct entry *entry; | ||
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| if (get_sha1_hex(buffer, sha1)) | ||
| die("bad sha1"); | ||
| entry = convert_entry(sha1); | ||
| memcpy(buffer, sha1_to_hex(entry->new_sha1), 40); | ||
| } | ||
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| static void convert_tree(void *buffer, unsigned long size) | ||
| { | ||
| while (size) { | ||
| int len = 1+strlen(buffer); | ||
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| convert_binary_sha1(buffer + len); | ||
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| len += 20; | ||
| if (len > size) | ||
| die("corrupt tree object"); | ||
| size -= len; | ||
| buffer += len; | ||
| } | ||
| } | ||
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| static void convert_commit(void *buffer, unsigned long size) | ||
| { | ||
| convert_ascii_sha1(buffer+5); | ||
| buffer += 46; /* "tree " + "hex sha1" + "\n" */ | ||
| while (!memcmp(buffer, "parent ", 7)) { | ||
| convert_ascii_sha1(buffer+7); | ||
| buffer += 48; | ||
| } | ||
| } | ||
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| static struct entry * convert_entry(unsigned char *sha1) | ||
| { | ||
| struct entry *entry = lookup_entry(sha1); | ||
| char type[20]; | ||
| void *buffer, *data; | ||
| unsigned long size, offset; | ||
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| if (entry->converted) | ||
| return entry; | ||
| data = read_sha1_file(sha1, type, &size); | ||
| if (!data) | ||
| die("unable to read object %s", sha1_to_hex(sha1)); | ||
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| buffer = malloc(size + 100); | ||
| offset = sprintf(buffer, "%s %lu", type, size)+1; | ||
| memcpy(buffer + offset, data, size); | ||
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| if (!strcmp(type, "blob")) | ||
| convert_blob(buffer + offset, size); | ||
| else if (!strcmp(type, "tree")) | ||
| convert_tree(buffer + offset, size); | ||
| else if (!strcmp(type, "commit")) | ||
| convert_commit(buffer + offset, size); | ||
| else | ||
| die("unknown object type '%s' in %s", type, sha1_to_hex(sha1)); | ||
| write_sha1_file(buffer, size + offset, entry->new_sha1); | ||
| entry->converted = 1; | ||
| free(buffer); | ||
| return entry; | ||
| } | ||
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| int main(int argc, char **argv) | ||
| { | ||
| unsigned char sha1[20]; | ||
| struct entry *entry; | ||
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| if (argc != 2 || get_sha1_hex(argv[1], sha1)) | ||
| usage("convert-cache <sha1>"); | ||
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| entry = convert_entry(sha1); | ||
| printf("new sha1: %s\n", sha1_to_hex(entry->new_sha1)); | ||
| return 0; | ||
| } |
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