From: Linus Torvalds Date: Sat, 9 Apr 2005 19:09:27 +0000 (-0700) Subject: Make "write_cache()" and friends available as generic routines. X-Git-Tag: v0.99~937 X-Git-Url: https://git.verplant.org/?a=commitdiff_plain;h=197ee8c97076ee784db9f4b5a9294e86f42d068c;p=git.git Make "write_cache()" and friends available as generic routines. This is needed for the change to make "read-tree" just read into the cache (and then you do a "checkout-cache" to update your current dir contents). --- diff --git a/cache.h b/cache.h index 0038e8b8..2581117a 100644 --- a/cache.h +++ b/cache.h @@ -73,7 +73,10 @@ unsigned int active_nr, active_alloc; /* Initialize and use the cache information */ extern int read_cache(void); +extern int write_cache(int newfd, struct cache_entry **cache, int entries); extern int cache_name_pos(const char *name, int namelen); +extern int add_cache_entry(struct cache_entry *ce); +extern int remove_file_from_cache(char *path); extern int cache_match_stat(struct cache_entry *ce, struct stat *st); #define MTIME_CHANGED 0x0001 @@ -97,8 +100,8 @@ extern int write_sha1_file(char *buf, unsigned len); extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size); /* Convert to/from hex/sha1 representation */ -extern int get_sha1_hex(char *hex, unsigned char *sha1); -extern char *sha1_to_hex(unsigned char *sha1); /* static buffer! */ +extern int get_sha1_hex(const char *hex, unsigned char *sha1); +extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ /* General helper functions */ extern void usage(const char *err); diff --git a/read-cache.c b/read-cache.c index c42d2de3..58487b56 100644 --- a/read-cache.c +++ b/read-cache.c @@ -26,7 +26,7 @@ static unsigned hexval(char c) return ~0; } -int get_sha1_hex(char *hex, unsigned char *sha1) +int get_sha1_hex(const char *hex, unsigned char *sha1) { int i; for (i = 0; i < 20; i++) { @@ -39,7 +39,7 @@ int get_sha1_hex(char *hex, unsigned char *sha1) return 0; } -char * sha1_to_hex(unsigned char *sha1) +char * sha1_to_hex(const unsigned char *sha1) { static char buffer[50]; static const char hex[] = "0123456789abcdef"; @@ -281,6 +281,44 @@ int cache_name_pos(const char *name, int namelen) return first; } +int remove_file_from_cache(char *path) +{ + int pos = cache_name_pos(path, strlen(path)); + if (pos < 0) { + pos = -pos-1; + active_nr--; + if (pos < active_nr) + memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos - 1) * sizeof(struct cache_entry *)); + } + return 0; +} + +int add_cache_entry(struct cache_entry *ce) +{ + int pos; + + pos = cache_name_pos(ce->name, ce->namelen); + + /* existing match? Just replace it */ + if (pos < 0) { + active_cache[-pos-1] = ce; + return 0; + } + + /* Make sure the array is big enough .. */ + if (active_nr == active_alloc) { + active_alloc = alloc_nr(active_alloc); + active_cache = realloc(active_cache, active_alloc * sizeof(struct cache_entry *)); + } + + /* Add it in.. */ + active_nr++; + if (active_nr > pos) + memmove(active_cache + pos + 1, active_cache + pos, (active_nr - pos - 1) * sizeof(ce)); + active_cache[pos] = ce; + return 0; +} + static int verify_hdr(struct cache_header *hdr, unsigned long size) { SHA_CTX c; @@ -354,3 +392,33 @@ unmap: return error("verify header failed"); } +int write_cache(int newfd, struct cache_entry **cache, int entries) +{ + SHA_CTX c; + struct cache_header hdr; + int i; + + hdr.signature = CACHE_SIGNATURE; + hdr.version = 1; + hdr.entries = entries; + + SHA1_Init(&c); + SHA1_Update(&c, &hdr, offsetof(struct cache_header, sha1)); + for (i = 0; i < entries; i++) { + struct cache_entry *ce = cache[i]; + int size = ce_size(ce); + SHA1_Update(&c, ce, size); + } + SHA1_Final(hdr.sha1, &c); + + if (write(newfd, &hdr, sizeof(hdr)) != sizeof(hdr)) + return -1; + + for (i = 0; i < entries; i++) { + struct cache_entry *ce = cache[i]; + int size = ce_size(ce); + if (write(newfd, ce, size) != size) + return -1; + } + return 0; +} diff --git a/update-cache.c b/update-cache.c index 7a076bea..03b111bf 100644 --- a/update-cache.c +++ b/update-cache.c @@ -5,44 +5,6 @@ */ #include "cache.h" -static int remove_file_from_cache(char *path) -{ - int pos = cache_name_pos(path, strlen(path)); - if (pos < 0) { - pos = -pos-1; - active_nr--; - if (pos < active_nr) - memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos - 1) * sizeof(struct cache_entry *)); - } - return 0; -} - -static int add_cache_entry(struct cache_entry *ce) -{ - int pos; - - pos = cache_name_pos(ce->name, ce->namelen); - - /* existing match? Just replace it */ - if (pos < 0) { - active_cache[-pos-1] = ce; - return 0; - } - - /* Make sure the array is big enough .. */ - if (active_nr == active_alloc) { - active_alloc = alloc_nr(active_alloc); - active_cache = realloc(active_cache, active_alloc * sizeof(struct cache_entry *)); - } - - /* Add it in.. */ - active_nr++; - if (active_nr > pos) - memmove(active_cache + pos + 1, active_cache + pos, (active_nr - pos - 1) * sizeof(ce)); - active_cache[pos] = ce; - return 0; -} - static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st) { z_stream stream; @@ -126,37 +88,6 @@ static int add_file_to_cache(char *path) return add_cache_entry(ce); } -static int write_cache(int newfd, struct cache_entry **cache, int entries) -{ - SHA_CTX c; - struct cache_header hdr; - int i; - - hdr.signature = CACHE_SIGNATURE; - hdr.version = 1; - hdr.entries = entries; - - SHA1_Init(&c); - SHA1_Update(&c, &hdr, offsetof(struct cache_header, sha1)); - for (i = 0; i < entries; i++) { - struct cache_entry *ce = cache[i]; - int size = ce_size(ce); - SHA1_Update(&c, ce, size); - } - SHA1_Final(hdr.sha1, &c); - - if (write(newfd, &hdr, sizeof(hdr)) != sizeof(hdr)) - return -1; - - for (i = 0; i < entries; i++) { - struct cache_entry *ce = cache[i]; - int size = ce_size(ce); - if (write(newfd, ce, size) != size) - return -1; - } - return 0; -} - /* * We fundamentally don't like some paths: we don't want * dot or dot-dot anywhere, and in fact, we don't even want