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Mini Shell
Mini Shell
# cython: language_level=3
from libc.stdint cimport uint8_t, uint64_t
from libc.string cimport memcpy, memset
from cpython.exc cimport PyErr_NoMemory
from cpython.mem cimport PyMem_Malloc, PyMem_Realloc, PyMem_Free
from cpython.unicode cimport PyUnicode_DecodeASCII
from string import ascii_letters, digits
cdef str GEN_DELIMS = ":/?#[]@"
cdef str SUB_DELIMS_WITHOUT_QS = "!$'()*,"
cdef str SUB_DELIMS = SUB_DELIMS_WITHOUT_QS + '+?=;'
cdef str RESERVED = GEN_DELIMS + SUB_DELIMS
cdef str UNRESERVED = ascii_letters + digits + '-._~'
cdef str ALLOWED = UNRESERVED + SUB_DELIMS_WITHOUT_QS
cdef str QS = '+&=;'
DEF BUF_SIZE = 8 * 1024 # 8KiB
cdef char BUFFER[BUF_SIZE]
cdef inline Py_UCS4 _to_hex(uint8_t v):
if v < 10:
return <Py_UCS4>(v+0x30) # ord('0') == 0x30
else:
return <Py_UCS4>(v+0x41-10) # ord('A') == 0x41
cdef inline int _from_hex(Py_UCS4 v):
if '0' <= v <= '9':
return <int>(v) - 0x30 # ord('0') == 0x30
elif 'A' <= v <= 'F':
return <int>(v) - 0x41 + 10 # ord('A') == 0x41
elif 'a' <= v <= 'f':
return <int>(v) - 0x61 + 10 # ord('a') == 0x61
else:
return -1
cdef inline Py_UCS4 _restore_ch(Py_UCS4 d1, Py_UCS4 d2):
cdef int digit1 = _from_hex(d1)
if digit1 < 0:
return <Py_UCS4>-1
cdef int digit2 = _from_hex(d2)
if digit2 < 0:
return <Py_UCS4>-1
return <Py_UCS4>(digit1 << 4 | digit2)
cdef uint8_t ALLOWED_TABLE[16]
cdef uint8_t ALLOWED_NOTQS_TABLE[16]
cdef inline bint bit_at(uint8_t array[], uint64_t ch):
return array[ch >> 3] & (1 << (ch & 7))
cdef inline void set_bit(uint8_t array[], uint64_t ch):
array[ch >> 3] |= (1 << (ch & 7))
memset(ALLOWED_TABLE, 0, sizeof(ALLOWED_TABLE))
memset(ALLOWED_NOTQS_TABLE, 0, sizeof(ALLOWED_NOTQS_TABLE))
for i in range(128):
if chr(i) in ALLOWED:
set_bit(ALLOWED_TABLE, i)
set_bit(ALLOWED_NOTQS_TABLE, i)
if chr(i) in QS:
set_bit(ALLOWED_NOTQS_TABLE, i)
# ----------------- writer ---------------------------
cdef struct Writer:
char *buf
Py_ssize_t size
Py_ssize_t pos
bint changed
cdef inline void _init_writer(Writer* writer):
writer.buf = &BUFFER[0]
writer.size = BUF_SIZE
writer.pos = 0
writer.changed = 0
cdef inline void _release_writer(Writer* writer):
if writer.buf != BUFFER:
PyMem_Free(writer.buf)
cdef inline int _write_char(Writer* writer, Py_UCS4 ch, bint changed):
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
writer.changed |= changed
return 0
cdef inline int _write_pct(Writer* writer, uint8_t ch, bint changed):
if _write_char(writer, '%', changed) < 0:
return -1
if _write_char(writer, _to_hex(<uint8_t>ch >> 4), changed) < 0:
return -1
return _write_char(writer, _to_hex(<uint8_t>ch & 0x0f), changed)
cdef inline int _write_percent(Writer* writer):
if _write_char(writer, '%', True) < 0:
return -1
if _write_char(writer, '2', True) < 0:
return -1
return _write_char(writer, '5', True)
cdef inline int _write_pct_check(Writer* writer, Py_UCS4 ch, Py_UCS4 pct[]):
cdef Py_UCS4 pct1 = _to_hex(<uint8_t>ch >> 4)
cdef Py_UCS4 pct2 = _to_hex(<uint8_t>ch & 0x0f)
cdef bint changed = pct[0] != pct1 or pct[1] != pct2
if _write_char(writer, '%', changed) < 0:
return -1
if _write_char(writer, pct1, changed) < 0:
return -1
return _write_char(writer, pct2, changed)
cdef inline int _write_utf8(Writer* writer, Py_UCS4 symbol):
cdef uint64_t utf = <uint64_t> symbol
if utf < 0x80:
return _write_pct(writer, <uint8_t>utf, True)
elif utf < 0x800:
if _write_pct(writer, <uint8_t>(0xc0 | (utf >> 6)), True) < 0:
return -1
return _write_pct(writer, <uint8_t>(0x80 | (utf & 0x3f)), True)
elif 0xD800 <= utf <= 0xDFFF:
# surogate pair, ignored
return 0
elif utf < 0x10000:
if _write_pct(writer, <uint8_t>(0xe0 | (utf >> 12)), True) < 0:
return -1
if _write_pct(writer, <uint8_t>(0x80 | ((utf >> 6) & 0x3f)),
True) < 0:
return -1
return _write_pct(writer, <uint8_t>(0x80 | (utf & 0x3f)), True)
elif utf > 0x10FFFF:
# symbol is too large
return 0
else:
if _write_pct(writer, <uint8_t>(0xf0 | (utf >> 18)), True) < 0:
return -1
if _write_pct(writer, <uint8_t>(0x80 | ((utf >> 12) & 0x3f)),
True) < 0:
return -1
if _write_pct(writer, <uint8_t>(0x80 | ((utf >> 6) & 0x3f)),
True) < 0:
return -1
return _write_pct(writer, <uint8_t>(0x80 | (utf & 0x3f)), True)
# --------------------- end writer --------------------------
cdef class _Quoter:
cdef bint _qs
cdef uint8_t _safe_table[16]
cdef uint8_t _protected_table[16]
def __init__(self, *, str safe='', str protected='', bint qs=False):
cdef Py_UCS4 ch
self._qs = qs
if not self._qs:
memcpy(self._safe_table,
ALLOWED_NOTQS_TABLE,
sizeof(self._safe_table))
else:
memcpy(self._safe_table,
ALLOWED_TABLE,
sizeof(self._safe_table))
for ch in safe:
if ord(ch) > 127:
raise ValueError("Only safe symbols with ORD < 128 are allowed")
set_bit(self._safe_table, ch)
memset(self._protected_table, 0, sizeof(self._protected_table))
for ch in protected:
if ord(ch) > 127:
raise ValueError("Only safe symbols with ORD < 128 are allowed")
set_bit(self._safe_table, ch)
set_bit(self._protected_table, ch)
def __call__(self, val):
cdef Writer writer
if val is None:
return None
if type(val) is not str:
if isinstance(val, str):
# derived from str
val = str(val)
else:
raise TypeError("Argument should be str")
_init_writer(&writer)
try:
return self._do_quote(<str>val, &writer)
finally:
_release_writer(&writer)
cdef str _do_quote(self, str val, Writer *writer):
cdef Py_UCS4 ch
cdef int has_pct = 0
cdef Py_UCS4 pct[2]
cdef int idx = 0
for ch in val:
if has_pct:
pct[has_pct-1] = ch
has_pct += 1
if has_pct == 3:
ch = _restore_ch(pct[0], pct[1])
has_pct = 0
if ch == <Py_UCS4>-1:
if _write_percent(writer) < 0:
raise
if self._write(writer, pct[0]) < 0:
raise
if self._write(writer, pct[1]) < 0:
raise
continue
if ch < 128:
if bit_at(self._protected_table, ch):
if _write_pct(writer, ch, True) < 0:
raise
continue
if bit_at(self._safe_table, ch):
if _write_char(writer, ch, True) < 0:
raise
continue
if _write_pct_check(writer, ch, pct) < 0:
raise
continue
elif ch == '%':
has_pct = 1
continue
if self._write(writer, ch) < 0:
raise
if has_pct:
if _write_percent(writer) < 0:
raise
if has_pct > 1: # the value is 2
if self._write(writer, ch) < 0:
raise
if not writer.changed:
return val
else:
return PyUnicode_DecodeASCII(writer.buf, writer.pos, "strict")
cdef inline int _write(self, Writer *writer, Py_UCS4 ch):
if self._qs:
if ch == ' ':
return _write_char(writer, '+', True)
if ch < 128 and bit_at(self._safe_table, ch):
return _write_char(writer, ch, False)
return _write_utf8(writer, ch)
cdef class _Unquoter:
cdef str _unsafe
cdef bint _qs
cdef _Quoter _quoter
cdef _Quoter _qs_quoter
def __init__(self, *, unsafe='', qs=False):
self._unsafe = unsafe
self._qs = qs
self._quoter = _Quoter()
self._qs_quoter = _Quoter(qs=True)
def __call__(self, val):
if val is None:
return None
if type(val) is not str:
if isinstance(val, str):
# derived from str
val = str(val)
else:
raise TypeError("Argument should be str")
return self._do_unquote(<str>val)
cdef str _do_unquote(self, str val):
if len(val) == 0:
return val
cdef str pct = ''
cdef str last_pct = ''
cdef bytearray pcts = bytearray()
cdef list ret = []
cdef str unquoted
for ch in val:
if pct:
pct += ch
if len(pct) == 3: # pragma: no branch # peephole optimizer
pcts.append(int(pct[1:], base=16))
last_pct = pct
pct = ''
continue
if pcts:
try:
unquoted = pcts.decode('utf8')
except UnicodeDecodeError:
pass
else:
if self._qs and unquoted in '+=&;':
ret.append(self._qs_quoter(unquoted))
elif unquoted in self._unsafe:
ret.append(self._quoter(unquoted))
else:
ret.append(unquoted)
del pcts[:]
if ch == '%':
pct = ch
continue
if pcts:
ret.append(last_pct) # %F8ab
last_pct = ''
if ch == '+':
if not self._qs or ch in self._unsafe:
ret.append('+')
else:
ret.append(' ')
continue
if ch in self._unsafe:
ret.append('%')
h = hex(ord(ch)).upper()[2:]
for ch in h:
ret.append(ch)
continue
ret.append(ch)
if pcts:
try:
unquoted = pcts.decode('utf8')
except UnicodeDecodeError:
ret.append(last_pct) # %F8
else:
if self._qs and unquoted in '+=&;':
ret.append(self._qs_quoter(unquoted))
elif unquoted in self._unsafe:
ret.append(self._quoter(unquoted))
else:
ret.append(unquoted)
return ''.join(ret)
Zerion Mini Shell 1.0