diff options
Diffstat (limited to 'subversion/libsvn_fs_x/id.c')
| -rw-r--r-- | subversion/libsvn_fs_x/id.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/subversion/libsvn_fs_x/id.c b/subversion/libsvn_fs_x/id.c new file mode 100644 index 0000000..0127175 --- /dev/null +++ b/subversion/libsvn_fs_x/id.c @@ -0,0 +1,198 @@ +/* id.c : implements FSX-internal ID functions + * + * ==================================================================== + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + * ==================================================================== + */ + +#include <assert.h> + +#include "id.h" +#include "index.h" +#include "util.h" + +#include "private/svn_string_private.h" + + + +svn_boolean_t +svn_fs_x__is_txn(svn_fs_x__change_set_t change_set) +{ + return change_set < SVN_FS_X__INVALID_CHANGE_SET; +} + +svn_boolean_t +svn_fs_x__is_revision(svn_fs_x__change_set_t change_set) +{ + return change_set > SVN_FS_X__INVALID_CHANGE_SET; +} + +svn_revnum_t +svn_fs_x__get_revnum(svn_fs_x__change_set_t change_set) +{ + return svn_fs_x__is_revision(change_set) + ? (svn_revnum_t)change_set + : SVN_INVALID_REVNUM; +} + +apr_int64_t +svn_fs_x__get_txn_id(svn_fs_x__change_set_t change_set) +{ + return svn_fs_x__is_txn(change_set) + ? -change_set + SVN_FS_X__INVALID_CHANGE_SET -1 + : SVN_FS_X__INVALID_TXN_ID; +} + + +svn_fs_x__change_set_t +svn_fs_x__change_set_by_rev(svn_revnum_t revnum) +{ + assert(revnum >= SVN_FS_X__INVALID_CHANGE_SET); + return revnum; +} + +svn_fs_x__change_set_t +svn_fs_x__change_set_by_txn(apr_int64_t txn_id) +{ + assert(txn_id >= SVN_FS_X__INVALID_CHANGE_SET); + return -txn_id + SVN_FS_X__INVALID_CHANGE_SET -1; +} + + +/* Parse the NUL-terminated ID part at DATA and write the result into *PART. + * Return TRUE if no errors were detected. */ +static svn_boolean_t +part_parse(svn_fs_x__id_t *part, + const char *data) +{ + part->number = svn__base36toui64(&data, data); + switch (data[0]) + { + /* txn number? */ + case '-': part->change_set = -svn__base36toui64(&data, data + 1); + return TRUE; + + /* revision number? */ + case '+': part->change_set = svn__base36toui64(&data, data + 1); + return TRUE; + + /* everything else is forbidden */ + default: return FALSE; + } +} + +/* Write the textual representation of *PART into P and return a pointer + * to the first position behind that string. + */ +static char * +part_unparse(char *p, + const svn_fs_x__id_t *part) +{ + p += svn__ui64tobase36(p, part->number); + if (part->change_set >= 0) + { + *(p++) = '+'; + p += svn__ui64tobase36(p, part->change_set); + } + else + { + *(p++) = '-'; + p += svn__ui64tobase36(p, -part->change_set); + } + + return p; +} + + + +/* Operations on ID parts */ + +svn_boolean_t +svn_fs_x__id_is_root(const svn_fs_x__id_t* part) +{ + return part->change_set == 0 && part->number == 0; +} + +svn_boolean_t +svn_fs_x__id_eq(const svn_fs_x__id_t *lhs, + const svn_fs_x__id_t *rhs) +{ + return lhs->change_set == rhs->change_set && lhs->number == rhs->number; +} + +svn_error_t * +svn_fs_x__id_parse(svn_fs_x__id_t *part, + const char *data) +{ + if (!part_parse(part, data)) + return svn_error_createf(SVN_ERR_FS_MALFORMED_NODEREV_ID, NULL, + "Malformed ID string"); + + return SVN_NO_ERROR; +} + +svn_string_t * +svn_fs_x__id_unparse(const svn_fs_x__id_t *id, + apr_pool_t *result_pool) +{ + char string[2 * SVN_INT64_BUFFER_SIZE + 1]; + char *p = part_unparse(string, id); + + return svn_string_ncreate(string, p - string, result_pool); +} + +void +svn_fs_x__id_reset(svn_fs_x__id_t *part) +{ + part->change_set = SVN_FS_X__INVALID_CHANGE_SET; + part->number = 0; +} + +svn_boolean_t +svn_fs_x__id_used(const svn_fs_x__id_t *part) +{ + return part->change_set != SVN_FS_X__INVALID_CHANGE_SET; +} + +void +svn_fs_x__init_txn_root(svn_fs_x__id_t *noderev_id, + svn_fs_x__txn_id_t txn_id) +{ + noderev_id->change_set = svn_fs_x__change_set_by_txn(txn_id); + noderev_id->number = SVN_FS_X__ITEM_INDEX_ROOT_NODE; +} + +void +svn_fs_x__init_rev_root(svn_fs_x__id_t *noderev_id, + svn_revnum_t rev) +{ + noderev_id->change_set = svn_fs_x__change_set_by_rev(rev); + noderev_id->number = SVN_FS_X__ITEM_INDEX_ROOT_NODE; +} + +int +svn_fs_x__id_compare(const svn_fs_x__id_t *a, + const svn_fs_x__id_t *b) +{ + if (a->change_set < b->change_set) + return -1; + if (a->change_set > b->change_set) + return 1; + + return a->number < b->number ? -1 : a->number == b->number ? 0 : 1; +} |