name : _http_writer.pyx from cpython.bytes cimport PyBytes_FromStringAndSize from cpython.exc cimport PyErr_NoMemory from cpython.mem cimport PyMem_Free, PyMem_Malloc, PyMem_Realloc from cpython.object cimport PyObject_Str from libc.stdint cimport uint8_t, uint64_t from libc.string cimport memcpy from multidict import istr DEF BUF_SIZE = 16 * 1024 # 16KiB cdef char BUFFER[BUF_SIZE] cdef object _istr = istr # ----------------- writer --------------------------- cdef struct Writer: char *buf Py_ssize_t size Py_ssize_t pos cdef inline void _init_writer(Writer* writer): writer.buf = &BUFFER[0] writer.size = BUF_SIZE writer.pos = 0 cdef inline void _release_writer(Writer* writer): if writer.buf != BUFFER: PyMem_Free(writer.buf) cdef inline int _write_byte(Writer* writer, uint8_t ch): cdef char * buf cdef Py_ssize_t size if writer.pos == writer.size: # reallocate size = writer.size + BUF_SIZE if writer.buf == BUFFER: buf = <char*>PyMem_Malloc(size) if buf == NULL: PyErr_NoMemory() return -1 memcpy(buf, writer.buf, writer.size) else: buf = <char*>PyMem_Realloc(writer.buf, size) if buf == NULL: PyErr_NoMemory() return -1 writer.buf = buf writer.size = size writer.buf[writer.pos] = <char>ch writer.pos += 1 return 0 cdef inline int _write_utf8(Writer* writer, Py_UCS4 symbol): cdef uint64_t utf = <uint64_t> symbol if utf < 0x80: return _write_byte(writer, <uint8_t>utf) elif utf < 0x800: if _write_byte(writer, <uint8_t>(0xc0 | (utf >> 6))) < 0: return -1 return _write_byte(writer, <uint8_t>(0x80 | (utf & 0x3f))) elif 0xD800 <= utf <= 0xDFFF: # surogate pair, ignored return 0 elif utf < 0x10000: if _write_byte(writer, <uint8_t>(0xe0 | (utf >> 12))) < 0: return -1 if _write_byte(writer, <uint8_t>(0x80 | ((utf >> 6) & 0x3f))) < 0: return -1 return _write_byte(writer, <uint8_t>(0x80 | (utf & 0x3f))) elif utf > 0x10FFFF: # symbol is too large return 0 else: if _write_byte(writer, <uint8_t>(0xf0 | (utf >> 18))) < 0: return -1 if _write_byte(writer, <uint8_t>(0x80 | ((utf >> 12) & 0x3f))) < 0: return -1 if _write_byte(writer, <uint8_t>(0x80 | ((utf >> 6) & 0x3f))) < 0: return -1 return _write_byte(writer, <uint8_t>(0x80 | (utf & 0x3f))) cdef inline int _write_str(Writer* writer, str s): cdef Py_UCS4 ch for ch in s: if _write_utf8(writer, ch) < 0: return -1 # --------------- _serialize_headers ---------------------- cdef str to_str(object s): typ = type(s) if typ is str: return <str>s elif typ is _istr: return PyObject_Str(s) elif not isinstance(s, str): raise TypeError("Cannot serialize non-str key {!r}".format(s)) else: return str(s) cdef void _safe_header(str string) except *: if "\r" in string or "\n" in string: raise ValueError( "Newline or carriage return character detected in HTTP status message or " "header. This is a potential security issue." ) def _serialize_headers(str status_line, headers): cdef Writer writer cdef object key cdef object val cdef bytes ret _init_writer(&writer) for key, val in headers.items(): _safe_header(to_str(key)) _safe_header(to_str(val)) try: if _write_str(&writer, status_line) < 0: raise if _write_byte(&writer, b'\r') < 0: raise if _write_byte(&writer, b'\n') < 0: raise for key, val in headers.items(): if _write_str(&writer, to_str(key)) < 0: raise if _write_byte(&writer, b':') < 0: raise if _write_byte(&writer, b' ') < 0: raise if _write_str(&writer, to_str(val)) < 0: raise if _write_byte(&writer, b'\r') < 0: raise if _write_byte(&writer, b'\n') < 0: raise if _write_byte(&writer, b'\r') < 0: raise if _write_byte(&writer, b'\n') < 0: raise return PyBytes_FromStringAndSize(writer.buf, writer.pos) finally: _release_writer(&writer)