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authorJonathan Nieder <jrnieder@gmail.com>2011-03-22 23:11:59 (GMT)
committerJonathan Nieder <jrnieder@gmail.com>2011-03-22 23:11:59 (GMT)
commit5c674860eb8bfa1a8c0038fc2d32c4fc205e9d62 (patch)
tree500514c85fa75199f38f87bc2f548aa1137f2b76 /vcs-svn/svndump.c
parentdd3f42ad793b5334d506a451addcefd0054c27bb (diff)
parent90c0a3cfe390208c86144bf97ec8fa5610febe0f (diff)
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Merge branch 'db/length-as-hash' (early part) into db/svn-fe-code-purge
* 'db/length-as-hash' (early part): vcs-svn: implement perfect hash for top-level keys vcs-svn: implement perfect hash for node-prop keys vcs-svn: improve reporting of input errors vcs-svn: make buffer_copy_bytes return length read vcs-svn: make buffer_skip_bytes return length read vcs-svn: improve support for reading large files Conflicts: vcs-svn/fast_export.c vcs-svn/svndump.c
Diffstat (limited to 'vcs-svn/svndump.c')
-rw-r--r--vcs-svn/svndump.c202
1 files changed, 129 insertions, 73 deletions
diff --git a/vcs-svn/svndump.c b/vcs-svn/svndump.c
index 7ecb227..ff985fe 100644
--- a/vcs-svn/svndump.c
+++ b/vcs-svn/svndump.c
@@ -16,6 +16,12 @@
#define REPORT_FILENO 3
+/*
+ * Compare start of string to literal of equal length;
+ * must be guarded by length test.
+ */
+#define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
+
#define NODEACT_REPLACE 4
#define NODEACT_DELETE 3
#define NODEACT_ADD 2
@@ -63,15 +69,6 @@ static struct {
uint32_t version, uuid, url;
} dump_ctx;
-static struct {
- uint32_t svn_log, svn_author, svn_date, svn_executable, svn_special, 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;
@@ -100,45 +97,43 @@ static void reset_dump_ctx(uint32_t url)
dump_ctx.uuid = ~0;
}
-static void init_keys(void)
-{
- keys.svn_log = pool_intern("svn:log");
- keys.svn_author = pool_intern("svn:author");
- keys.svn_date = pool_intern("svn:date");
- keys.svn_executable = pool_intern("svn:executable");
- keys.svn_special = pool_intern("svn:special");
- 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");
-}
-
-static void handle_property(uint32_t key, const char *val, uint32_t len,
+static void handle_property(const struct strbuf *key_buf,
+ const char *val, uint32_t len,
uint32_t *type_set)
{
- if (key == keys.svn_log) {
+ const char *key = key_buf->buf;
+ size_t keylen = key_buf->len;
+
+ switch (keylen + 1) {
+ case sizeof("svn:log"):
+ if (constcmp(key, "svn:log"))
+ break;
if (!val)
die("invalid dump: unsets svn:log");
/* Value length excludes terminating nul. */
rev_ctx.log = log_copy(len + 1, val);
- } else if (key == keys.svn_author) {
+ break;
+ case sizeof("svn:author"):
+ if (constcmp(key, "svn:author"))
+ break;
rev_ctx.author = pool_intern(val);
- } else if (key == keys.svn_date) {
+ break;
+ case sizeof("svn:date"):
+ if (constcmp(key, "svn:date"))
+ break;
if (!val)
die("invalid dump: unsets svn:date");
if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
warning("invalid timestamp: %s", val);
- } else if (key == keys.svn_executable || key == keys.svn_special) {
+ break;
+ case sizeof("svn:executable"):
+ case sizeof("svn:special"):
+ if (keylen == strlen("svn:executable") &&
+ constcmp(key, "svn:executable"))
+ break;
+ if (keylen == strlen("svn:special") &&
+ constcmp(key, "svn:special"))
+ break;
if (*type_set) {
if (!val)
return;
@@ -149,15 +144,22 @@ static void handle_property(uint32_t key, const char *val, uint32_t len,
return;
}
*type_set = 1;
- node_ctx.type = key == keys.svn_executable ?
+ node_ctx.type = keylen == strlen("svn:executable") ?
REPO_MODE_EXE :
REPO_MODE_LNK;
}
}
+static void die_short_read(void)
+{
+ if (buffer_ferror(&input))
+ die_errno("error reading dump file");
+ die("invalid dump: unexpected end of file");
+}
+
static void read_props(void)
{
- uint32_t key = ~0;
+ static struct strbuf key = STRBUF_INIT;
const char *t;
/*
* NEEDSWORK: to support simple mode changes like
@@ -176,25 +178,37 @@ static void read_props(void)
uint32_t len;
const char *val;
const char type = t[0];
+ int ch;
if (!type || t[1] != ' ')
die("invalid property line: %s\n", t);
len = atoi(&t[2]);
val = buffer_read_string(&input, len);
- buffer_skip_bytes(&input, 1); /* Discard trailing newline. */
+ if (!val || strlen(val) != len)
+ die_short_read();
+
+ /* Discard trailing newline. */
+ ch = buffer_read_char(&input);
+ if (ch == EOF)
+ die_short_read();
+ if (ch != '\n')
+ die("invalid dump: expected newline after %s", val);
switch (type) {
case 'K':
- key = pool_intern(val);
- continue;
case 'D':
- key = pool_intern(val);
+ strbuf_reset(&key);
+ if (val)
+ strbuf_add(&key, val, len);
+ if (type == 'K')
+ continue;
+ assert(type == 'D');
val = NULL;
len = 0;
/* fall through */
case 'V':
- handle_property(key, val, len, &type_set);
- key = ~0;
+ handle_property(&key, val, len, &type_set);
+ strbuf_reset(&key);
continue;
default:
die("invalid property line: %s\n", t);
@@ -313,25 +327,32 @@ 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))) {
val = strstr(t, ": ");
if (!val)
continue;
- *val++ = '\0';
- *val++ = '\0';
- key = pool_intern(t);
+ val += 2;
- 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)
@@ -340,21 +361,31 @@ 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")) {
@@ -367,21 +398,44 @@ 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;
pool_tok_seq(REPO_MAX_PATH_DEPTH, 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);
+ t = buffer_read_line(&input);
+ if (!t)
+ die_short_read();
+ if (*t)
+ die("invalid dump: expected blank line after content length header");
if (active_ctx == REV_CTX) {
read_props();
} else if (active_ctx == NODE_CTX) {
@@ -389,10 +443,13 @@ void svndump_read(const char *url)
active_ctx = INTERNODE_CTX;
} else {
fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
- buffer_skip_bytes(&input, len);
+ if (buffer_skip_bytes(&input, len) != len)
+ die_short_read();
}
}
}
+ if (buffer_ferror(&input))
+ die_short_read();
if (active_ctx == NODE_CTX)
handle_node();
if (active_ctx == REV_CTX)
@@ -409,7 +466,6 @@ int svndump_init(const char *filename)
reset_dump_ctx(~0);
reset_rev_ctx(0);
reset_node_ctx(NULL);
- init_keys();
return 0;
}