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cpython/Modules/cjkcodecs/cjkcodecs.h

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/*
* cjkcodecs.h: common header for cjkcodecs
*
* Written by Hye-Shik Chang <perky@FreeBSD.org>
*/
#ifndef _CJKCODECS_H_
#define _CJKCODECS_H_
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "multibytecodec.h"
/* a unicode "undefined" code point */
#define UNIINV 0xFFFE
/* internal-use DBCS code points which aren't used by any charsets */
#define NOCHAR 0xFFFF
#define MULTIC 0xFFFE
#define DBCINV 0xFFFD
/* shorter macros to save source size of mapping tables */
#define U UNIINV
#define N NOCHAR
#define M MULTIC
#define D DBCINV
struct dbcs_index {
const ucs2_t *map;
unsigned char bottom, top;
};
typedef struct dbcs_index decode_map;
struct widedbcs_index {
const ucs4_t *map;
unsigned char bottom, top;
};
typedef struct widedbcs_index widedecode_map;
struct unim_index {
const DBCHAR *map;
unsigned char bottom, top;
};
typedef struct unim_index encode_map;
struct unim_index_bytebased {
const unsigned char *map;
unsigned char bottom, top;
};
struct dbcs_map {
const char *charset;
const struct unim_index *encmap;
const struct dbcs_index *decmap;
};
struct pair_encodemap {
ucs4_t uniseq;
DBCHAR code;
};
static const MultibyteCodec *codec_list;
static const struct dbcs_map *mapping_list;
#define CODEC_INIT(encoding) \
static int encoding##_codec_init(const void *config)
#define ENCODER_INIT(encoding) \
static int encoding##_encode_init( \
MultibyteCodec_State *state, const void *config)
#define ENCODER(encoding) \
static Py_ssize_t encoding##_encode( \
MultibyteCodec_State *state, const void *config, \
const Py_UNICODE **inbuf, Py_ssize_t inleft, \
unsigned char **outbuf, Py_ssize_t outleft, int flags)
#define ENCODER_RESET(encoding) \
static Py_ssize_t encoding##_encode_reset( \
MultibyteCodec_State *state, const void *config, \
unsigned char **outbuf, Py_ssize_t outleft)
#define DECODER_INIT(encoding) \
static int encoding##_decode_init( \
MultibyteCodec_State *state, const void *config)
#define DECODER(encoding) \
static Py_ssize_t encoding##_decode( \
MultibyteCodec_State *state, const void *config, \
const unsigned char **inbuf, Py_ssize_t inleft, \
Py_UNICODE **outbuf, Py_ssize_t outleft)
#define DECODER_RESET(encoding) \
static Py_ssize_t encoding##_decode_reset( \
MultibyteCodec_State *state, const void *config)
#if Py_UNICODE_SIZE == 4
#define UCS4INVALID(code) \
if ((code) > 0xFFFF) \
return 1;
#else
#define UCS4INVALID(code) \
if (0) ;
#endif
#define NEXT_IN(i) \
(*inbuf) += (i); \
(inleft) -= (i);
#define NEXT_OUT(o) \
(*outbuf) += (o); \
(outleft) -= (o);
#define NEXT(i, o) \
NEXT_IN(i) NEXT_OUT(o)
#define REQUIRE_INBUF(n) \
if (inleft < (n)) \
return MBERR_TOOFEW;
#define REQUIRE_OUTBUF(n) \
if (outleft < (n)) \
return MBERR_TOOSMALL;
#define IN1 ((*inbuf)[0])
#define IN2 ((*inbuf)[1])
#define IN3 ((*inbuf)[2])
#define IN4 ((*inbuf)[3])
#define OUT1(c) ((*outbuf)[0]) = (c);
#define OUT2(c) ((*outbuf)[1]) = (c);
#define OUT3(c) ((*outbuf)[2]) = (c);
#define OUT4(c) ((*outbuf)[3]) = (c);
#define WRITE1(c1) \
REQUIRE_OUTBUF(1) \
(*outbuf)[0] = (c1);
#define WRITE2(c1, c2) \
REQUIRE_OUTBUF(2) \
(*outbuf)[0] = (c1); \
(*outbuf)[1] = (c2);
#define WRITE3(c1, c2, c3) \
REQUIRE_OUTBUF(3) \
(*outbuf)[0] = (c1); \
(*outbuf)[1] = (c2); \
(*outbuf)[2] = (c3);
#define WRITE4(c1, c2, c3, c4) \
REQUIRE_OUTBUF(4) \
(*outbuf)[0] = (c1); \
(*outbuf)[1] = (c2); \
(*outbuf)[2] = (c3); \
(*outbuf)[3] = (c4);
#if Py_UNICODE_SIZE == 2
# define WRITEUCS4(c) \
REQUIRE_OUTBUF(2) \
(*outbuf)[0] = 0xd800 + (((c) - 0x10000) >> 10); \
(*outbuf)[1] = 0xdc00 + (((c) - 0x10000) & 0x3ff); \
NEXT_OUT(2)
#else
# define WRITEUCS4(c) \
REQUIRE_OUTBUF(1) \
**outbuf = (Py_UNICODE)(c); \
NEXT_OUT(1)
#endif
#define _TRYMAP_ENC(m, assi, val) \
((m)->map != NULL && (val) >= (m)->bottom && \
(val)<= (m)->top && ((assi) = (m)->map[(val) - \
(m)->bottom]) != NOCHAR)
#define TRYMAP_ENC_COND(charset, assi, uni) \
_TRYMAP_ENC(&charset##_encmap[(uni) >> 8], assi, (uni) & 0xff)
#define TRYMAP_ENC(charset, assi, uni) \
if TRYMAP_ENC_COND(charset, assi, uni)
#define _TRYMAP_DEC(m, assi, val) \
((m)->map != NULL && (val) >= (m)->bottom && \
(val)<= (m)->top && ((assi) = (m)->map[(val) - \
(m)->bottom]) != UNIINV)
#define TRYMAP_DEC(charset, assi, c1, c2) \
if _TRYMAP_DEC(&charset##_decmap[c1], assi, c2)
#define _TRYMAP_ENC_MPLANE(m, assplane, asshi, asslo, val) \
((m)->map != NULL && (val) >= (m)->bottom && \
(val)<= (m)->top && \
((assplane) = (m)->map[((val) - (m)->bottom)*3]) != 0 && \
(((asshi) = (m)->map[((val) - (m)->bottom)*3 + 1]), 1) && \
(((asslo) = (m)->map[((val) - (m)->bottom)*3 + 2]), 1))
#define TRYMAP_ENC_MPLANE(charset, assplane, asshi, asslo, uni) \
if _TRYMAP_ENC_MPLANE(&charset##_encmap[(uni) >> 8], \
assplane, asshi, asslo, (uni) & 0xff)
#define TRYMAP_DEC_MPLANE(charset, assi, plane, c1, c2) \
if _TRYMAP_DEC(&charset##_decmap[plane][c1], assi, c2)
#if Py_UNICODE_SIZE == 2
#define DECODE_SURROGATE(c) \
if (c >> 10 == 0xd800 >> 10) { /* high surrogate */ \
REQUIRE_INBUF(2) \
if (IN2 >> 10 == 0xdc00 >> 10) { /* low surrogate */ \
c = 0x10000 + ((ucs4_t)(c - 0xd800) << 10) + \
((ucs4_t)(IN2) - 0xdc00); \
} \
}
#define GET_INSIZE(c) ((c) > 0xffff ? 2 : 1)
#else
#define DECODE_SURROGATE(c) {;}
#define GET_INSIZE(c) 1
#endif
#define BEGIN_MAPPINGS_LIST static const struct dbcs_map _mapping_list[] = {
#define MAPPING_ENCONLY(enc) {#enc, (void*)enc##_encmap, NULL},
#define MAPPING_DECONLY(enc) {#enc, NULL, (void*)enc##_decmap},
#define MAPPING_ENCDEC(enc) {#enc, (void*)enc##_encmap, (void*)enc##_decmap},
#define END_MAPPINGS_LIST \
{"", NULL, NULL} }; \
static const struct dbcs_map *mapping_list = \
(const struct dbcs_map *)_mapping_list;
#define BEGIN_CODECS_LIST static const MultibyteCodec _codec_list[] = {
#define _STATEFUL_METHODS(enc) \
enc##_encode, \
enc##_encode_init, \
enc##_encode_reset, \
enc##_decode, \
enc##_decode_init, \
enc##_decode_reset,
#define _STATELESS_METHODS(enc) \
enc##_encode, NULL, NULL, \
enc##_decode, NULL, NULL,
#define CODEC_STATEFUL(enc) { \
#enc, NULL, NULL, \
_STATEFUL_METHODS(enc) \
},
#define CODEC_STATELESS(enc) { \
#enc, NULL, NULL, \
_STATELESS_METHODS(enc) \
},
#define CODEC_STATELESS_WINIT(enc) { \
#enc, NULL, \
enc##_codec_init, \
_STATELESS_METHODS(enc) \
},
#define END_CODECS_LIST \
{"", NULL,} }; \
static const MultibyteCodec *codec_list = \
(const MultibyteCodec *)_codec_list;
static PyObject *
getmultibytecodec(void)
{
static PyObject *cofunc = NULL;
if (cofunc == NULL) {
PyObject *mod = PyImport_ImportModuleNoBlock("_multibytecodec");
if (mod == NULL)
return NULL;
cofunc = PyObject_GetAttrString(mod, "__create_codec");
Py_DECREF(mod);
}
return cofunc;
}
static PyObject *
getcodec(PyObject *self, PyObject *encoding)
{
PyObject *codecobj, *r, *cofunc;
const MultibyteCodec *codec;
const char *enc;
if (!PyString_Check(encoding)) {
PyErr_SetString(PyExc_TypeError,
"encoding name must be a string.");
return NULL;
}
cofunc = getmultibytecodec();
if (cofunc == NULL)
return NULL;
enc = PyString_AS_STRING(encoding);
for (codec = codec_list; codec->encoding[0]; codec++)
if (strcmp(codec->encoding, enc) == 0)
break;
if (codec->encoding[0] == '\0') {
PyErr_SetString(PyExc_LookupError,
"no such codec is supported.");
return NULL;
}
codecobj = PyCapsule_New((void *)codec, PyMultibyteCodec_CAPSULE_NAME, NULL);
if (codecobj == NULL)
return NULL;
r = PyObject_CallFunctionObjArgs(cofunc, codecobj, NULL);
Py_DECREF(codecobj);
return r;
}
static struct PyMethodDef __methods[] = {
{"getcodec", (PyCFunction)getcodec, METH_O, ""},
{NULL, NULL},
};
static int
register_maps(PyObject *module)
{
const struct dbcs_map *h;
for (h = mapping_list; h->charset[0] != '\0'; h++) {
char mhname[256] = "__map_";
int r;
strcpy(mhname + sizeof("__map_") - 1, h->charset);
r = PyModule_AddObject(module, mhname,
PyCapsule_New((void *)h, PyMultibyteCodec_CAPSULE_NAME, NULL));
if (r == -1)
return -1;
}
return 0;
}
#ifdef USING_BINARY_PAIR_SEARCH
static DBCHAR
find_pairencmap(ucs2_t body, ucs2_t modifier,
const struct pair_encodemap *haystack, int haystacksize)
{
int pos, min, max;
ucs4_t value = body << 16 | modifier;
min = 0;
max = haystacksize;
for (pos = haystacksize >> 1; min != max; pos = (min + max) >> 1)
if (value < haystack[pos].uniseq) {
if (max == pos) break;
else max = pos;
}
else if (value > haystack[pos].uniseq) {
if (min == pos) break;
else min = pos;
}
else
break;
if (value == haystack[pos].uniseq)
return haystack[pos].code;
else
return DBCINV;
}
#endif
#ifdef USING_IMPORTED_MAPS
#define IMPORT_MAP(locale, charset, encmap, decmap) \
importmap("_codecs_" #locale, "__map_" #charset, \
(const void**)encmap, (const void**)decmap)
static int
importmap(const char *modname, const char *symbol,
const void **encmap, const void **decmap)
{
PyObject *o, *mod;
mod = PyImport_ImportModule((char *)modname);
if (mod == NULL)
return -1;
o = PyObject_GetAttrString(mod, (char*)symbol);
if (o == NULL)
goto errorexit;
else if (!PyCapsule_IsValid(o, PyMultibyteCodec_CAPSULE_NAME)) {
PyErr_SetString(PyExc_ValueError,
"map data must be a Capsule.");
goto errorexit;
}
else {
struct dbcs_map *map;
map = PyCapsule_GetPointer(o, PyMultibyteCodec_CAPSULE_NAME);
if (encmap != NULL)
*encmap = map->encmap;
if (decmap != NULL)
*decmap = map->decmap;
Py_DECREF(o);
}
Py_DECREF(mod);
return 0;
errorexit:
Py_DECREF(mod);
return -1;
}
#endif
#define I_AM_A_MODULE_FOR(loc) \
void \
init_codecs_##loc(void) \
{ \
PyObject *m = Py_InitModule("_codecs_" #loc, __methods);\
if (m != NULL) \
(void)register_maps(m); \
}
#endif
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