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