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