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_json.c
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621 lines (597 loc) · 19.7 KB
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#include "Python.h"
#define DEFAULT_ENCODING "utf-8"
#define S_CHAR(c) (c >= ' ' && c <= '~' && c != '\\' && c != '"')
#define MIN_EXPANSION 6
#ifdef Py_UNICODE_WIDE
#define MAX_EXPANSION (2 * MIN_EXPANSION)
#else
#define MAX_EXPANSION MIN_EXPANSION
#endif
static Py_ssize_t
ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars)
{
Py_UNICODE x;
output[chars++] = '\\';
switch (c) {
case '\\': output[chars++] = (char)c; break;
case '"': output[chars++] = (char)c; break;
case '\b': output[chars++] = 'b'; break;
case '\f': output[chars++] = 'f'; break;
case '\n': output[chars++] = 'n'; break;
case '\r': output[chars++] = 'r'; break;
case '\t': output[chars++] = 't'; break;
default:
#ifdef Py_UNICODE_WIDE
if (c >= 0x10000) {
/* UTF-16 surrogate pair */
Py_UNICODE v = c - 0x10000;
c = 0xd800 | ((v >> 10) & 0x3ff);
output[chars++] = 'u';
x = (c & 0xf000) >> 12;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x0f00) >> 8;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x00f0) >> 4;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x000f);
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
c = 0xdc00 | (v & 0x3ff);
output[chars++] = '\\';
}
#endif
output[chars++] = 'u';
x = (c & 0xf000) >> 12;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x0f00) >> 8;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x00f0) >> 4;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x000f);
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
}
return chars;
}
static PyObject *
ascii_escape_unicode(PyObject *pystr)
{
Py_ssize_t i;
Py_ssize_t input_chars;
Py_ssize_t output_size;
Py_ssize_t chars;
PyObject *rval;
char *output;
Py_UNICODE *input_unicode;
input_chars = PyUnicode_GET_SIZE(pystr);
input_unicode = PyUnicode_AS_UNICODE(pystr);
/* One char input can be up to 6 chars output, estimate 4 of these */
output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
rval = PyString_FromStringAndSize(NULL, output_size);
if (rval == NULL) {
return NULL;
}
output = PyString_AS_STRING(rval);
chars = 0;
output[chars++] = '"';
for (i = 0; i < input_chars; i++) {
Py_UNICODE c = input_unicode[i];
if (S_CHAR(c)) {
output[chars++] = (char)c;
}
else {
chars = ascii_escape_char(c, output, chars);
}
if (output_size - chars < (1 + MAX_EXPANSION)) {
/* There's more than four, so let's resize by a lot */
output_size *= 2;
/* This is an upper bound */
if (output_size > 2 + (input_chars * MAX_EXPANSION)) {
output_size = 2 + (input_chars * MAX_EXPANSION);
}
if (_PyString_Resize(&rval, output_size) == -1) {
return NULL;
}
output = PyString_AS_STRING(rval);
}
}
output[chars++] = '"';
if (_PyString_Resize(&rval, chars) == -1) {
return NULL;
}
return rval;
}
static PyObject *
ascii_escape_str(PyObject *pystr)
{
Py_ssize_t i;
Py_ssize_t input_chars;
Py_ssize_t output_size;
Py_ssize_t chars;
PyObject *rval;
char *output;
char *input_str;
input_chars = PyString_GET_SIZE(pystr);
input_str = PyString_AS_STRING(pystr);
/* One char input can be up to 6 chars output, estimate 4 of these */
output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
rval = PyString_FromStringAndSize(NULL, output_size);
if (rval == NULL) {
return NULL;
}
output = PyString_AS_STRING(rval);
chars = 0;
output[chars++] = '"';
for (i = 0; i < input_chars; i++) {
Py_UNICODE c = (Py_UNICODE)input_str[i];
if (S_CHAR(c)) {
output[chars++] = (char)c;
}
else if (c > 0x7F) {
/* We hit a non-ASCII character, bail to unicode mode */
PyObject *uni;
Py_DECREF(rval);
uni = PyUnicode_DecodeUTF8(input_str, input_chars, "strict");
if (uni == NULL) {
return NULL;
}
rval = ascii_escape_unicode(uni);
Py_DECREF(uni);
return rval;
}
else {
chars = ascii_escape_char(c, output, chars);
}
/* An ASCII char can't possibly expand to a surrogate! */
if (output_size - chars < (1 + MIN_EXPANSION)) {
/* There's more than four, so let's resize by a lot */
output_size *= 2;
if (output_size > 2 + (input_chars * MIN_EXPANSION)) {
output_size = 2 + (input_chars * MIN_EXPANSION);
}
if (_PyString_Resize(&rval, output_size) == -1) {
return NULL;
}
output = PyString_AS_STRING(rval);
}
}
output[chars++] = '"';
if (_PyString_Resize(&rval, chars) == -1) {
return NULL;
}
return rval;
}
void
raise_errmsg(char *msg, PyObject *s, Py_ssize_t end)
{
static PyObject *errmsg_fn = NULL;
PyObject *pymsg;
if (errmsg_fn == NULL) {
PyObject *decoder = PyImport_ImportModule("json.decoder");
if (decoder == NULL)
return;
errmsg_fn = PyObject_GetAttrString(decoder, "errmsg");
if (errmsg_fn == NULL)
return;
Py_DECREF(decoder);
}
pymsg = PyObject_CallFunction(errmsg_fn, "(zOn)", msg, s, end);
if (pymsg) {
PyErr_SetObject(PyExc_ValueError, pymsg);
Py_DECREF(pymsg);
}
/*
def linecol(doc, pos):
lineno = doc.count('\n', 0, pos) + 1
if lineno == 1:
colno = pos
else:
colno = pos - doc.rindex('\n', 0, pos)
return lineno, colno
def errmsg(msg, doc, pos, end=None):
lineno, colno = linecol(doc, pos)
if end is None:
return '%s: line %d column %d (char %d)' % (msg, lineno, colno, pos)
endlineno, endcolno = linecol(doc, end)
return '%s: line %d column %d - line %d column %d (char %d - %d)' % (
msg, lineno, colno, endlineno, endcolno, pos, end)
*/
}
static PyObject *
join_list_unicode(PyObject *lst)
{
static PyObject *ustr = NULL;
static PyObject *joinstr = NULL;
if (ustr == NULL) {
Py_UNICODE c = 0;
ustr = PyUnicode_FromUnicode(&c, 0);
}
if (joinstr == NULL) {
joinstr = PyString_InternFromString("join");
}
if (joinstr == NULL || ustr == NULL) {
return NULL;
}
return PyObject_CallMethodObjArgs(ustr, joinstr, lst, NULL);
}
static PyObject *
scanstring_str(PyObject *pystr, Py_ssize_t end, char *encoding, int strict)
{
PyObject *rval;
Py_ssize_t len = PyString_GET_SIZE(pystr);
Py_ssize_t begin = end - 1;
Py_ssize_t next = begin;
char *buf = PyString_AS_STRING(pystr);
PyObject *chunks = PyList_New(0);
if (chunks == NULL) {
goto bail;
}
if (end < 0 || len <= end) {
PyErr_SetString(PyExc_ValueError, "end is out of bounds");
goto bail;
}
while (1) {
/* Find the end of the string or the next escape */
Py_UNICODE c = 0;
PyObject *chunk = NULL;
for (next = end; next < len; next++) {
c = buf[next];
if (c == '"' || c == '\\') {
break;
}
else if (strict && c <= 0x1f) {
raise_errmsg("Invalid control character at", pystr, next);
goto bail;
}
}
if (!(c == '"' || c == '\\')) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
/* Pick up this chunk if it's not zero length */
if (next != end) {
PyObject *strchunk = PyBuffer_FromMemory(&buf[end], next - end);
if (strchunk == NULL) {
goto bail;
}
chunk = PyUnicode_FromEncodedObject(strchunk, encoding, NULL);
Py_DECREF(strchunk);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
next++;
if (c == '"') {
end = next;
break;
}
if (next == len) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
c = buf[next];
if (c != 'u') {
/* Non-unicode backslash escapes */
end = next + 1;
switch (c) {
case '"': break;
case '\\': break;
case '/': break;
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
default: c = 0;
}
if (c == 0) {
raise_errmsg("Invalid \\escape", pystr, end - 2);
goto bail;
}
}
else {
c = 0;
next++;
end = next + 4;
if (end >= len) {
raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
goto bail;
}
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_ssize_t shl = (end - next - 1) << 2;
Py_UNICODE digit = buf[next];
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c |= (digit - '0') << shl; break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c |= (digit - 'a' + 10) << shl; break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c |= (digit - 'A' + 10) << shl; break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
#ifdef Py_UNICODE_WIDE
/* Surrogate pair */
if (c >= 0xd800 && c <= 0xdbff) {
Py_UNICODE c2 = 0;
if (end + 6 >= len) {
raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
end - 5);
}
if (buf[next++] != '\\' || buf[next++] != 'u') {
raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
end - 5);
}
end += 6;
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_ssize_t shl = (end - next - 1) << 2;
Py_UNICODE digit = buf[next];
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c2 |= (digit - '0') << shl; break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c2 |= (digit - 'a' + 10) << shl; break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c2 |= (digit - 'A' + 10) << shl; break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
}
#endif
}
chunk = PyUnicode_FromUnicode(&c, 1);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
rval = join_list_unicode(chunks);
if (rval == NULL) {
goto bail;
}
Py_CLEAR(chunks);
return Py_BuildValue("(Nn)", rval, end);
bail:
Py_XDECREF(chunks);
return NULL;
}
static PyObject *
scanstring_unicode(PyObject *pystr, Py_ssize_t end, int strict)
{
PyObject *rval;
Py_ssize_t len = PyUnicode_GET_SIZE(pystr);
Py_ssize_t begin = end - 1;
Py_ssize_t next = begin;
const Py_UNICODE *buf = PyUnicode_AS_UNICODE(pystr);
PyObject *chunks = PyList_New(0);
if (chunks == NULL) {
goto bail;
}
if (end < 0 || len <= end) {
PyErr_SetString(PyExc_ValueError, "end is out of bounds");
goto bail;
}
while (1) {
/* Find the end of the string or the next escape */
Py_UNICODE c = 0;
PyObject *chunk = NULL;
for (next = end; next < len; next++) {
c = buf[next];
if (c == '"' || c == '\\') {
break;
}
else if (strict && c <= 0x1f) {
raise_errmsg("Invalid control character at", pystr, next);
goto bail;
}
}
if (!(c == '"' || c == '\\')) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
/* Pick up this chunk if it's not zero length */
if (next != end) {
chunk = PyUnicode_FromUnicode(&buf[end], next - end);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
next++;
if (c == '"') {
end = next;
break;
}
if (next == len) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
c = buf[next];
if (c != 'u') {
/* Non-unicode backslash escapes */
end = next + 1;
switch (c) {
case '"': break;
case '\\': break;
case '/': break;
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
default: c = 0;
}
if (c == 0) {
raise_errmsg("Invalid \\escape", pystr, end - 2);
goto bail;
}
}
else {
c = 0;
next++;
end = next + 4;
if (end >= len) {
raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
goto bail;
}
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_ssize_t shl = (end - next - 1) << 2;
Py_UNICODE digit = buf[next];
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c |= (digit - '0') << shl; break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c |= (digit - 'a' + 10) << shl; break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c |= (digit - 'A' + 10) << shl; break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
#ifdef Py_UNICODE_WIDE
/* Surrogate pair */
if (c >= 0xd800 && c <= 0xdbff) {
Py_UNICODE c2 = 0;
if (end + 6 >= len) {
raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
end - 5);
}
if (buf[next++] != '\\' || buf[next++] != 'u') {
raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
end - 5);
}
end += 6;
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_ssize_t shl = (end - next - 1) << 2;
Py_UNICODE digit = buf[next];
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c2 |= (digit - '0') << shl; break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c2 |= (digit - 'a' + 10) << shl; break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c2 |= (digit - 'A' + 10) << shl; break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
}
#endif
}
chunk = PyUnicode_FromUnicode(&c, 1);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
rval = join_list_unicode(chunks);
if (rval == NULL) {
goto bail;
}
Py_CLEAR(chunks);
return Py_BuildValue("(Nn)", rval, end);
bail:
Py_XDECREF(chunks);
return NULL;
}
PyDoc_STRVAR(pydoc_scanstring,
"scanstring(basestring, end, encoding) -> (str, end)\n");
static PyObject *
py_scanstring(PyObject* self, PyObject *args)
{
PyObject *pystr;
Py_ssize_t end;
char *encoding = NULL;
int strict = 0;
if (!PyArg_ParseTuple(args, "On|zi:scanstring", &pystr, &end, &encoding, &strict)) {
return NULL;
}
if (encoding == NULL) {
encoding = DEFAULT_ENCODING;
}
if (PyString_Check(pystr)) {
return scanstring_str(pystr, end, encoding, strict);
}
else if (PyUnicode_Check(pystr)) {
return scanstring_unicode(pystr, end, strict);
}
else {
PyErr_Format(PyExc_TypeError,
"first argument must be a string or unicode, not %.80s",
Py_TYPE(pystr)->tp_name);
return NULL;
}
}
PyDoc_STRVAR(pydoc_encode_basestring_ascii,
"encode_basestring_ascii(basestring) -> str\n");
static PyObject *
py_encode_basestring_ascii(PyObject* self, PyObject *pystr)
{
/* METH_O */
if (PyString_Check(pystr)) {
return ascii_escape_str(pystr);
}
else if (PyUnicode_Check(pystr)) {
return ascii_escape_unicode(pystr);
}
else {
PyErr_Format(PyExc_TypeError,
"first argument must be a string or unicode, not %.80s",
Py_TYPE(pystr)->tp_name);
return NULL;
}
}
static PyMethodDef json_methods[] = {
{"encode_basestring_ascii", (PyCFunction)py_encode_basestring_ascii,
METH_O, pydoc_encode_basestring_ascii},
{"scanstring", (PyCFunction)py_scanstring, METH_VARARGS,
pydoc_scanstring},
{NULL, NULL, 0, NULL}
};
PyDoc_STRVAR(module_doc,
"json speedups\n");
void
init_json(void)
{
PyObject *m;
m = Py_InitModule3("_json", json_methods, module_doc);
}