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Diffstat (limited to 'src/initcache.cpp')
| -rw-r--r-- | src/initcache.cpp | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/initcache.cpp b/src/initcache.cpp new file mode 100644 index 00000000..052a016c --- /dev/null +++ b/src/initcache.cpp @@ -0,0 +1,184 @@ +/****************************************************************************** + * Project: PROJ.4 + * Purpose: init file definition cache. + * Author: Frank Warmerdam, warmerdam@pobox.com + * + ****************************************************************************** + * Copyright (c) 2009, Frank Warmerdam + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + *****************************************************************************/ + +#include <string.h> + +#include "projects.h" + +static int cache_count = 0; +static int cache_alloc = 0; +static char **cache_key = nullptr; +static paralist **cache_paralist = nullptr; + +/************************************************************************/ +/* pj_clone_paralist() */ +/* */ +/* Allocate a copy of a parameter list. */ +/************************************************************************/ + +paralist *pj_clone_paralist( const paralist *list) +{ + paralist *list_copy = nullptr, *next_copy = nullptr; + + for( ; list != nullptr; list = list->next ) + { + paralist *newitem = (paralist *) + pj_malloc(sizeof(paralist) + strlen(list->param)); + + newitem->used = 0; + newitem->next = nullptr; + strcpy( newitem->param, list->param ); + + if( list_copy == nullptr ) + list_copy = newitem; + else + next_copy->next = newitem; + + next_copy = newitem; + } + + return list_copy; +} + +/************************************************************************/ +/* pj_clear_initcache() */ +/* */ +/* Clear out all memory held in the init file cache. */ +/************************************************************************/ + +void pj_clear_initcache() +{ + if( cache_alloc > 0 ) + { + int i; + + pj_acquire_lock(); + + for( i = 0; i < cache_count; i++ ) + { + paralist *n, *t = cache_paralist[i]; + + pj_dalloc( cache_key[i] ); + + /* free parameter list elements */ + for (; t != nullptr; t = n) { + n = t->next; + pj_dalloc(t); + } + } + + pj_dalloc( cache_key ); + pj_dalloc( cache_paralist ); + cache_count = 0; + cache_alloc= 0; + cache_key = nullptr; + cache_paralist = nullptr; + + pj_release_lock(); + } +} + +/************************************************************************/ +/* pj_search_initcache() */ +/* */ +/* Search for a matching definition in the init cache. */ +/************************************************************************/ + +paralist *pj_search_initcache( const char *filekey ) + +{ + int i; + paralist *result = nullptr; + + pj_acquire_lock(); + + for( i = 0; result == nullptr && i < cache_count; i++) + { + if( strcmp(filekey,cache_key[i]) == 0 ) + { + result = pj_clone_paralist( cache_paralist[i] ); + } + } + + pj_release_lock(); + + return result; +} + +/************************************************************************/ +/* pj_insert_initcache() */ +/* */ +/* Insert a paralist definition in the init file cache. */ +/************************************************************************/ + +void pj_insert_initcache( const char *filekey, const paralist *list ) + +{ + pj_acquire_lock(); + + /* + ** Grow list if required. + */ + if( cache_count == cache_alloc ) + { + char **cache_key_new; + paralist **cache_paralist_new; + + cache_alloc = cache_alloc * 2 + 15; + + cache_key_new = (char **) pj_malloc(sizeof(char*) * cache_alloc); + if( cache_key && cache_count ) + { + memcpy( cache_key_new, cache_key, sizeof(char*) * cache_count); + } + pj_dalloc( cache_key ); + cache_key = cache_key_new; + + cache_paralist_new = (paralist **) + pj_malloc(sizeof(paralist*) * cache_alloc); + if( cache_paralist && cache_count ) + { + memcpy( cache_paralist_new, cache_paralist, + sizeof(paralist*) * cache_count ); + } + pj_dalloc( cache_paralist ); + cache_paralist = cache_paralist_new; + } + + /* + ** Duplicate the filekey and paralist, and insert in cache. + */ + cache_key[cache_count] = (char *) pj_malloc(strlen(filekey)+1); + strcpy( cache_key[cache_count], filekey ); + + cache_paralist[cache_count] = pj_clone_paralist( list ); + + cache_count++; + + pj_release_lock(); +} + |