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public function Pascal2String($pascalstring) {

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// Pascal strings have 1 unsigned byte at the beginning saying how many chars (1-255) are in the string

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return substr($pascalstring, 1);

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}

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/**

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* @param string $pascalstring

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* @return string

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public function MaybePascal2String($pascalstring) {

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// Pascal strings have 1 unsigned byte at the beginning saying how many chars (1-255) are in the string

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// Check if string actually is in this format or written incorrectly, straight string, or null-terminated string

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if (ord(substr($pascalstring, 0, 1)) == (strlen($pascalstring) - 1)) {

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return substr($pascalstring, 1);

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} elseif (substr($pascalstring, -1, 1) == "\x00") {

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// appears to be null-terminated instead of Pascal-style

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return substr($pascalstring, 0, -1);

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}

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return $pascalstring;

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}

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/**

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* Helper functions for m4b audiobook chapters

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* code by Steffen Hartmann 2015-Nov-08.

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* @param array $info

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* @param string $tag

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* @param string $history

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* @param array $result

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public function search_tag_by_key($info, $tag, $history, &$result) {

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foreach ($info as $key => $value) {

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$key_history = $history.'/'.$key;

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if ($key === $tag) {

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$result[] = array($key_history, $info);

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} else {

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if (is_array($value)) {

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$this->search_tag_by_key($value, $tag, $key_history, $result);

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}

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}

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}

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}

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/**

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* @param array $info

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* @param string $k

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* @param string $v

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* @param string $history

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* @param array $result

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public function search_tag_by_pair($info, $k, $v, $history, &$result) {

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foreach ($info as $key => $value) {

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$key_history = $history.'/'.$key;

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if (($key === $k) && ($value === $v)) {

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$result[] = array($key_history, $info);

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} else {

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if (is_array($value)) {

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$this->search_tag_by_pair($value, $k, $v, $key_history, $result);

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}

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}

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}

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}

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/**

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* @param array $info

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* @return array

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public function quicktime_time_to_sample_table($info) {

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$res = array();

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$this->search_tag_by_pair($info['quicktime']['moov'], 'name', 'stbl', 'quicktime/moov', $res);

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foreach ($res as $value) {

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$stbl_res = array();

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$this->search_tag_by_pair($value[1], 'data_format', 'text', $value[0], $stbl_res);

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if (count($stbl_res) > 0) {

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$stts_res = array();

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$this->search_tag_by_key($value[1], 'time_to_sample_table', $value[0], $stts_res);

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if (count($stts_res) > 0) {

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return $stts_res[0][1]['time_to_sample_table'];

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}

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}

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}

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return array();

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}

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/**

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* @param array $info

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* @return int

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public function quicktime_bookmark_time_scale($info) {

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$time_scale = '';

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$ts_prefix_len = 0;

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$res = array();

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$this->search_tag_by_pair($info['quicktime']['moov'], 'name', 'stbl', 'quicktime/moov', $res);

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foreach ($res as $value) {

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$stbl_res = array();

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$this->search_tag_by_pair($value[1], 'data_format', 'text', $value[0], $stbl_res);

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if (count($stbl_res) > 0) {

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$ts_res = array();

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$this->search_tag_by_key($info['quicktime']['moov'], 'time_scale', 'quicktime/moov', $ts_res);

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foreach ($ts_res as $sub_value) {

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$prefix = substr($sub_value[0], 0, -12);

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if ((substr($stbl_res[0][0], 0, strlen($prefix)) === $prefix) && ($ts_prefix_len < strlen($prefix))) {

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$time_scale = $sub_value[1]['time_scale'];

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$ts_prefix_len = strlen($prefix);

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}

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}

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}

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}

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return $time_scale;

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}

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// END helper functions for m4b audiobook chapters

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}

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