[PATCH 2/3] vcs-svn: implement perfect hash for top-level keys
This eliminates one more dependency on string_pool.
Signed-off-by: David Barr <david.barr@cordelta.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: David Barr <david.barr@cordelta.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: David Barr <david.barr@cordelta.com>
---
vcs-svn/svndump.c | 110 +++++++++++++++++++++++++++++------------------------
1 files changed, 60 insertions(+), 50 deletions(-)
diff --git a/vcs-svn/svndump.c b/vcs-svn/svndump.c
index 48848ff..f03e8cf 100644
--- a/vcs-svn/svndump.c
+++ b/vcs-svn/svndump.c
@@ -51,14 +51,6 @@ static struct {
uint32_t version, uuid, url;
} dump_ctx;
-static struct {
- uint32_t uuid, revision_number, node_path, node_kind, node_action,
- node_copyfrom_path, node_copyfrom_rev, text_content_length,
- prop_content_length, content_length, svn_fs_dump_format_version,
- /* version 3 format */
- text_delta, prop_delta;
-} keys;
-
static void reset_node_ctx(char *fname)
{
node_ctx.type = 0;
@@ -89,24 +81,6 @@ static void reset_dump_ctx(uint32_t url)
dump_ctx.uuid = ~0;
}
-static void init_keys(void)
-{
- keys.uuid = pool_intern("UUID");
- keys.revision_number = pool_intern("Revision-number");
- keys.node_path = pool_intern("Node-path");
- keys.node_kind = pool_intern("Node-kind");
- keys.node_action = pool_intern("Node-action");
- keys.node_copyfrom_path = pool_intern("Node-copyfrom-path");
- keys.node_copyfrom_rev = pool_intern("Node-copyfrom-rev");
- keys.text_content_length = pool_intern("Text-content-length");
- keys.prop_content_length = pool_intern("Prop-content-length");
- keys.content_length = pool_intern("Content-length");
- keys.svn_fs_dump_format_version = pool_intern("SVN-fs-dump-format-version");
- /* version 3 format (Subversion 1.1.0) */
- keys.text_delta = pool_intern("Text-delta");
- keys.prop_delta = pool_intern("Prop-delta");
-}
-
/* Compare string to literal of equal length; must be guarded by length test. */
#define constcmp(s, ref) memcmp((s), (ref), sizeof(ref) - 1)
@@ -326,7 +300,6 @@ void svndump_read(const char *url)
char *t;
uint32_t active_ctx = DUMP_CTX;
uint32_t len;
- uint32_t key;
reset_dump_ctx(pool_intern(url));
while ((t = buffer_read_line(&input))) {
@@ -335,16 +308,25 @@ void svndump_read(const char *url)
continue;
*val++ = '\0';
*val++ = '\0';
- key = pool_intern(t);
- if (key == keys.svn_fs_dump_format_version) {
+ /* strlen(key) + 1 */
+ switch (val - t - 1) {
+ case sizeof("SVN-fs-dump-format-version"):
+ if (constcmp(t, "SVN-fs-dump-format-version"))
+ continue;
dump_ctx.version = atoi(val);
if (dump_ctx.version > 3)
die("expected svn dump format version <= 3, found %"PRIu32,
dump_ctx.version);
- } else if (key == keys.uuid) {
+ break;
+ case sizeof("UUID"):
+ if (constcmp(t, "UUID"))
+ continue;
dump_ctx.uuid = pool_intern(val);
- } else if (key == keys.revision_number) {
+ break;
+ case sizeof("Revision-number"):
+ if (constcmp(t, "Revision-number"))
+ continue;
if (active_ctx == NODE_CTX)
handle_node();
if (active_ctx == REV_CTX)
@@ -353,21 +335,31 @@ void svndump_read(const char *url)
end_revision();
active_ctx = REV_CTX;
reset_rev_ctx(atoi(val));
- } else if (key == keys.node_path) {
- if (active_ctx == NODE_CTX)
- handle_node();
- if (active_ctx == REV_CTX)
- begin_revision();
- active_ctx = NODE_CTX;
- reset_node_ctx(val);
- } else if (key == keys.node_kind) {
+ break;
+ case sizeof("Node-path"):
+ if (prefixcmp(t, "Node-"))
+ continue;
+ if (!constcmp(t + strlen("Node-"), "path")) {
+ if (active_ctx == NODE_CTX)
+ handle_node();
+ if (active_ctx == REV_CTX)
+ begin_revision();
+ active_ctx = NODE_CTX;
+ reset_node_ctx(val);
+ break;
+ }
+ if (constcmp(t + strlen("Node-"), "kind"))
+ continue;
if (!strcmp(val, "dir"))
node_ctx.type = REPO_MODE_DIR;
else if (!strcmp(val, "file"))
node_ctx.type = REPO_MODE_BLB;
else
fprintf(stderr, "Unknown node-kind: %s\n", val);
- } else if (key == keys.node_action) {
+ break;
+ case sizeof("Node-action"):
+ if (constcmp(t, "Node-action"))
+ continue;
if (!strcmp(val, "delete")) {
node_ctx.action = NODEACT_DELETE;
} else if (!strcmp(val, "add")) {
@@ -380,20 +372,39 @@ void svndump_read(const char *url)
fprintf(stderr, "Unknown node-action: %s\n", val);
node_ctx.action = NODEACT_UNKNOWN;
}
- } else if (key == keys.node_copyfrom_path) {
+ break;
+ case sizeof("Node-copyfrom-path"):
+ if (constcmp(t, "Node-copyfrom-path"))
+ continue;
strbuf_reset(&node_ctx.src);
strbuf_addstr(&node_ctx.src, val);
- } else if (key == keys.node_copyfrom_rev) {
+ break;
+ case sizeof("Node-copyfrom-rev"):
+ if (constcmp(t, "Node-copyfrom-rev"))
+ continue;
node_ctx.srcRev = atoi(val);
- } else if (key == keys.text_content_length) {
- node_ctx.textLength = atoi(val);
- } else if (key == keys.prop_content_length) {
+ break;
+ case sizeof("Text-content-length"):
+ if (!constcmp(t, "Text-content-length")) {
+ node_ctx.textLength = atoi(val);
+ break;
+ }
+ if (constcmp(t, "Prop-content-length"))
+ continue;
node_ctx.propLength = atoi(val);
- } else if (key == keys.text_delta) {
- node_ctx.text_delta = !strcmp(val, "true");
- } else if (key == keys.prop_delta) {
+ break;
+ case sizeof("Text-delta"):
+ if (!constcmp(t, "Text-delta")) {
+ node_ctx.text_delta = !strcmp(val, "true");
+ break;
+ }
+ if (constcmp(t, "Prop-delta"))
+ continue;
node_ctx.prop_delta = !strcmp(val, "true");
- } else if (key == keys.content_length) {
+ break;
+ case sizeof("Content-length"):
+ if (constcmp(t, "Content-length"))
+ continue;
len = atoi(val);
buffer_read_line(&input);
if (active_ctx == REV_CTX) {
@@ -426,7 +437,6 @@ int svndump_init(const char *filename)
reset_dump_ctx(~0);
reset_rev_ctx(0);
reset_node_ctx(NULL);
- init_keys();
return 0;
}
--
1.7.3.2.846.gf4b062
David Barr <david.barr@cordelta.com>