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�i�t��B�������������?�� data = $data; $this->data_length = strlen($this->data); } /** * Parse the input data * * @return bool true on success, false on failure */ public function parse() { while ($this->state && $this->state !== 'emit' && $this->has_data()) { $state = $this->state; $this->$state(); } $this->data = ''; if ($this->state === 'emit' || $this->state === 'body') { return true; } $this->http_version = ''; $this->status_code = ''; $this->reason = ''; $this->headers = array(); $this->body = ''; return false; } /** * Check whether there is data beyond the pointer * * @return bool true if there is further data, false if not */ protected function has_data() { return (bool) ($this->position < $this->data_length); } /** * See if the next character is LWS * * @return bool true if the next character is LWS, false if not */ protected function is_linear_whitespace() { return (bool) ($this->data[$this->position] === "\x09" || $this->data[$this->position] === "\x20" || ($this->data[$this->position] === "\x0A" && isset($this->data[$this->position + 1]) && ($this->data[$this->position + 1] === "\x09" || $this->data[$this->position + 1] === "\x20"))); } /** * Parse the HTTP version */ protected function http_version() { if (strpos($this->data, "\x0A") !== false && strtoupper(substr($this->data, 0, 5)) === 'HTTP/') { $len = strspn($this->data, '0123456789.', 5); $this->http_version = substr($this->data, 5, $len); $this->position += 5 + $len; if (substr_count($this->http_version, '.') <= 1) { $this->http_version = (float) $this->http_version; $this->position += strspn($this->data, "\x09\x20", $this->position); $this->state = 'status'; } else { $this->state = false; } } else { $this->state = false; } } /** * Parse the status code */ protected function status() { if ($len = strspn($this->data, '0123456789', $this->position)) { $this->status_code = (int) substr($this->data, $this->position, $len); $this->position += $len; $this->state = 'reason'; } else { $this->state = false; } } /** * Parse the reason phrase */ protected function reason() { $len = strcspn($this->data, "\x0A", $this->position); $this->reason = trim(substr($this->data, $this->position, $len), "\x09\x0D\x20"); $this->position += $len + 1; $this->state = 'new_line'; } /** * Deal with a new line, shifting data around as needed */ protected function new_line() { $this->value = trim($this->value, "\x0D\x20"); if ($this->name !== '' && $this->value !== '') { $this->name = strtolower($this->name); // We should only use the last Content-Type header. c.f. issue #1 if (isset($this->headers[$this->name]) && $this->name !== 'content-type') { $this->headers[$this->name] .= ', ' . $this->value; } else { $this->headers[$this->name] = $this->value; } } $this->name = ''; $this->value = ''; if (substr($this->data[$this->position], 0, 2) === "\x0D\x0A") { $this->position += 2; $this->state = 'body'; } elseif ($this->data[$this->position] === "\x0A") { $this->position++; $this->state = 'body'; } else { $this->state = 'name'; } } /** * Parse a header name */ protected function name() { $len = strcspn($this->data, "\x0A:", $this->position); if (isset($this->data[$this->position + $len])) { if ($this->data[$this->position + $len] === "\x0A") { $this->position += $len; $this->state = 'new_line'; } else { $this->name = substr($this->data, $this->position, $len); $this->position += $len + 1; $this->state = 'value'; } } else { $this->state = false; } } /** * Parse LWS, replacing consecutive LWS characters with a single space */ protected function linear_whitespace() { do { if (substr($this->data, $this->position, 2) === "\x0D\x0A") { $this->position += 2; } elseif ($this->data[$this->position] === "\x0A") { $this->position++; } $this->position += strspn($this->data, "\x09\x20", $this->position); } while ($this->has_data() && $this->is_linear_whitespace()); $this->value .= "\x20"; } /** * See what state to move to while within non-quoted header values */ protected function value() { if ($this->is_linear_whitespace()) { $this->linear_whitespace(); } else { switch ($this->data[$this->position]) { case '"': // Workaround for ETags: we have to include the quotes as // part of the tag. if (strtolower($this->name) === 'etag') { $this->value .= '"'; $this->position++; $this->state = 'value_char'; break; } $this->position++; $this->state = 'quote'; break; case "\x0A": $this->position++; $this->state = 'new_line'; break; default: $this->state = 'value_char'; break; } } } /** * Parse a header value while outside quotes */ protected function value_char() { $len = strcspn($this->data, "\x09\x20\x0A\"", $this->position); $this->value .= substr($this->data, $this->position, $len); $this->position += $len; $this->state = 'value'; } /** * See what state to move to while within quoted header values */ protected function quote() { if ($this->is_linear_whitespace()) { $this->linear_whitespace(); } else { switch ($this->data[$this->position]) { case '"': $this->position++; $this->state = 'value'; break; case "\x0A": $this->position++; $this->state = 'new_line'; break; case '\\': $this->position++; $this->state = 'quote_escaped'; break; default: $this->state = 'quote_char'; break; } } } /** * Parse a header value while within quotes */ protected function quote_char() { $len = strcspn($this->data, "\x09\x20\x0A\"\\", $this->position); $this->value .= substr($this->data, $this->position, $len); $this->position += $len; $this->state = 'value'; } /** * Parse an escaped character within quotes */ protected function quote_escaped() { $this->value .= $this->data[$this->position]; $this->position++; $this->state = 'quote'; } /** * Parse the body */ protected function body() { $this->body = substr($this->data, $this->position); if (!empty($this->headers['transfer-encoding'])) { unset($this->headers['transfer-encoding']); $this->state = 'chunked'; } else { $this->state = 'emit'; } } /** * Parsed a "Transfer-Encoding: chunked" body */ protected function chunked() { if (!preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', trim($this->body))) { $this->state = 'emit'; return; } $decoded = ''; $encoded = $this->body; while (true) { $is_chunked = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $encoded, $matches ); if (!$is_chunked) { // Looks like it's not chunked after all $this->state = 'emit'; return; } $length = hexdec(trim($matches[1])); if ($length === 0) { // Ignore trailer headers $this->state = 'emit'; $this->body = $decoded; return; } $chunk_length = strlen($matches[0]); $decoded .= $part = substr($encoded, $chunk_length, $length); $encoded = substr($encoded, $chunk_length + $length + 2); if (trim($encoded) === '0' || empty($encoded)) { $this->state = 'emit'; $this->body = $decoded; return; } } } /** * Prepare headers (take care of proxies headers) * * @param string $headers Raw headers * @param integer $count Redirection count. Default to 1. * * @return string */ static public function prepareHeaders($headers, $count = 1) { $data = explode("\r\n\r\n", $headers, $count); $data = array_pop($data); if (false !== stripos($data, "HTTP/1.0 200 Connection established\r\n")) { $exploded = explode("\r\n\r\n", $data, 2); $data = end($exploded); } if (false !== stripos($data, "HTTP/1.1 200 Connection established\r\n")) { $exploded = explode("\r\n\r\n", $data, 2); $data = end($exploded); } return $data; } }