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Diffstat (limited to 'plugins/FreeImage/Source/FreeImage/CacheFile.cpp')
| -rw-r--r-- | plugins/FreeImage/Source/FreeImage/CacheFile.cpp | 271 |
1 files changed, 0 insertions, 271 deletions
diff --git a/plugins/FreeImage/Source/FreeImage/CacheFile.cpp b/plugins/FreeImage/Source/FreeImage/CacheFile.cpp deleted file mode 100644 index 309faf8faf..0000000000 --- a/plugins/FreeImage/Source/FreeImage/CacheFile.cpp +++ /dev/null @@ -1,271 +0,0 @@ -// ========================================================== -// Multi-Page functions -// -// Design and implementation by -// - Floris van den Berg (flvdberg@wxs.nl) -// - checkered (checkered@users.sourceforge.net) -// -// This file is part of FreeImage 3 -// -// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY -// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES -// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE -// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED -// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT -// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY -// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL -// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER -// THIS DISCLAIMER. -// -// Use at your own risk! -// ========================================================== - -#ifdef _MSC_VER -#pragma warning (disable : 4786) // identifier was truncated to 'number' characters -#endif - -#include "CacheFile.h" - -// ---------------------------------------------------------- - -CacheFile::CacheFile(const std::string filename, BOOL keep_in_memory) : -m_file(NULL), -m_filename(filename), -m_free_pages(), -m_page_cache_mem(), -m_page_cache_disk(), -m_page_map(), -m_page_count(0), -m_current_block(NULL), -m_keep_in_memory(keep_in_memory) { -} - -CacheFile::~CacheFile() { -} - -BOOL -CacheFile::open() { - if ((!m_filename.empty()) && (!m_keep_in_memory)) { - m_file = fopen(m_filename.c_str(), "w+b"); - return (m_file != NULL); - } - - return (m_keep_in_memory == TRUE); -} - -void -CacheFile::close() { - // dispose the cache entries - - while (!m_page_cache_disk.empty()) { - Block *block = *m_page_cache_disk.begin(); - m_page_cache_disk.pop_front(); - delete [] block->data; - delete block; - } - while (!m_page_cache_mem.empty()) { - Block *block = *m_page_cache_mem.begin(); - m_page_cache_mem.pop_front(); - delete [] block->data; - delete block; - } - - if (m_file) { - // close the file - - fclose(m_file); - - // delete the file - - remove(m_filename.c_str()); - } -} - -void -CacheFile::cleanupMemCache() { - if (!m_keep_in_memory) { - if (m_page_cache_mem.size() > CACHE_SIZE) { - // flush the least used block to file - - Block *old_block = m_page_cache_mem.back(); - fseek(m_file, old_block->nr * BLOCK_SIZE, SEEK_SET); - fwrite(old_block->data, BLOCK_SIZE, 1, m_file); - - // remove the data - - delete [] old_block->data; - old_block->data = NULL; - - // move the block to another list - - m_page_cache_disk.splice(m_page_cache_disk.begin(), m_page_cache_mem, --m_page_cache_mem.end()); - m_page_map[old_block->nr] = m_page_cache_disk.begin(); - } - } -} - -int -CacheFile::allocateBlock() { - Block *block = new Block; - block->data = new BYTE[BLOCK_SIZE]; - block->next = 0; - - if (!m_free_pages.empty()) { - block->nr = *m_free_pages.begin(); - m_free_pages.pop_front(); - } else { - block->nr = m_page_count++; - } - - m_page_cache_mem.push_front(block); - m_page_map[block->nr] = m_page_cache_mem.begin(); - - cleanupMemCache(); - - return block->nr; -} - -Block * -CacheFile::lockBlock(int nr) { - if (m_current_block == NULL) { - PageMapIt it = m_page_map.find(nr); - - if (it != m_page_map.end()) { - m_current_block = *(it->second); - - // the block is swapped out to disc. load it back - // and remove the block from the cache. it might get cached - // again as soon as the memory buffer fills up - - if (m_current_block->data == NULL) { - m_current_block->data = new BYTE[BLOCK_SIZE]; - - fseek(m_file, m_current_block->nr * BLOCK_SIZE, SEEK_SET); - fread(m_current_block->data, BLOCK_SIZE, 1, m_file); - - m_page_cache_mem.splice(m_page_cache_mem.begin(), m_page_cache_disk, it->second); - m_page_map[nr] = m_page_cache_mem.begin(); - } - - // if the memory cache size is too large, swap an item to disc - - cleanupMemCache(); - - // return the current block - - return m_current_block; - } - } - - return NULL; -} - -BOOL -CacheFile::unlockBlock(int nr) { - if (m_current_block) { - m_current_block = NULL; - - return TRUE; - } - - return FALSE; -} - -BOOL -CacheFile::deleteBlock(int nr) { - if (!m_current_block) { - PageMapIt it = m_page_map.find(nr); - - // remove block from cache - - if (it != m_page_map.end()) - m_page_map.erase(nr); - - // add block to free page list - - m_free_pages.push_back(nr); - - return TRUE; - } - - return FALSE; -} - -BOOL -CacheFile::readFile(BYTE *data, int nr, int size) { - if ((data) && (size > 0)) { - int s = 0; - int block_nr = nr; - - do { - int copy_nr = block_nr; - - Block *block = lockBlock(copy_nr); - - block_nr = block->next; - - memcpy(data + s, block->data, (s + BLOCK_SIZE > size) ? size - s : BLOCK_SIZE); - - unlockBlock(copy_nr); - - s += BLOCK_SIZE; - } while (block_nr != 0); - - return TRUE; - } - - return FALSE; -} - -int -CacheFile::writeFile(BYTE *data, int size) { - if ((data) && (size > 0)) { - int nr_blocks_required = 1 + (size / BLOCK_SIZE); - int count = 0; - int s = 0; - int stored_alloc; - int alloc; - - stored_alloc = alloc = allocateBlock(); - - do { - int copy_alloc = alloc; - - Block *block = lockBlock(copy_alloc); - - block->next = 0; - - memcpy(block->data, data + s, (s + BLOCK_SIZE > size) ? size - s : BLOCK_SIZE); - - if (count + 1 < nr_blocks_required) - alloc = block->next = allocateBlock(); - - unlockBlock(copy_alloc); - - s += BLOCK_SIZE; - } while (++count < nr_blocks_required); - - return stored_alloc; - } - - return 0; -} - -void -CacheFile::deleteFile(int nr) { - do { - Block *block = lockBlock(nr); - - if (block == NULL) - break; - - int next = block->next; - - unlockBlock(nr); - - deleteBlock(nr); - - nr = next; - } while (nr != 0); -} - |