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- <?php
- class OLE_ChainedBlockStream extends PEAR
- {
-
- var $ole;
-
- var $params;
-
- var $data;
-
- var $pos;
-
- function stream_open($path, $mode, $options, &$openedPath)
- {
- if ($mode != 'r') {
- if ($options & STREAM_REPORT_ERRORS) {
- trigger_error('Only reading is supported', E_USER_WARNING);
- }
- return false;
- }
-
- parse_str(substr($path, 25), $this->params);
- if (!isset($this->params['oleInstanceId'],
- $this->params['blockId'],
- $GLOBALS['_OLE_INSTANCES'][$this->params['oleInstanceId']])) {
- if ($options & STREAM_REPORT_ERRORS) {
- trigger_error('OLE stream not found', E_USER_WARNING);
- }
- return false;
- }
- $this->ole = $GLOBALS['_OLE_INSTANCES'][$this->params['oleInstanceId']];
- $blockId = $this->params['blockId'];
- $this->data = '';
- if (isset($this->params['size']) &&
- $this->params['size'] < $this->ole->bigBlockThreshold &&
- $blockId != $this->ole->root->_StartBlock) {
-
- $rootPos = $this->ole->_getBlockOffset($this->ole->root->_StartBlock);
- while ($blockId != -2) {
- $pos = $rootPos + $blockId * $this->ole->bigBlockSize;
- $blockId = $this->ole->sbat[$blockId];
- fseek($this->ole->_file_handle, $pos);
- $this->data .= fread($this->ole->_file_handle, $this->ole->bigBlockSize);
- }
- } else {
-
- while ($blockId != -2) {
- $pos = $this->ole->_getBlockOffset($blockId);
- fseek($this->ole->_file_handle, $pos);
- $this->data .= fread($this->ole->_file_handle, $this->ole->bigBlockSize);
- $blockId = $this->ole->bbat[$blockId];
- }
- }
- if (isset($this->params['size'])) {
- $this->data = substr($this->data, 0, $this->params['size']);
- }
- if ($options & STREAM_USE_PATH) {
- $openedPath = $path;
- }
- return true;
- }
-
- function stream_close()
- {
- $this->ole = null;
- unset($GLOBALS['_OLE_INSTANCES']);
- }
-
- function stream_read($count)
- {
- if ($this->stream_eof()) {
- return false;
- }
- $s = substr($this->data, $this->pos, $count);
- $this->pos += $count;
- return $s;
- }
-
- function stream_eof()
- {
- $eof = $this->pos >= strlen($this->data);
-
- if (version_compare(PHP_VERSION, '5.0', '>=') &&
- version_compare(PHP_VERSION, '5.1', '<')) {
- $eof = !$eof;
- }
- return $eof;
- }
-
- function stream_tell()
- {
- return $this->pos;
- }
-
- function stream_seek($offset, $whence)
- {
- if ($whence == SEEK_SET && $offset >= 0) {
- $this->pos = $offset;
- } elseif ($whence == SEEK_CUR && -$offset <= $this->pos) {
- $this->pos += $offset;
- } elseif ($whence == SEEK_END && -$offset <= sizeof($this->data)) {
- $this->pos = strlen($this->data) + $offset;
- } else {
- return false;
- }
- return true;
- }
-
- function stream_stat()
- {
- return array(
- 'size' => strlen($this->data),
- );
- }
-
-
-
-
-
-
-
-
-
-
-
- }
- ?>
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