1 | /* |
2 | ** Routines to represent binary data in ASCII and vice-versa |
3 | ** |
4 | ** This module currently supports the following encodings: |
5 | ** uuencode: |
6 | ** each line encodes 45 bytes (except possibly the last) |
7 | ** First char encodes (binary) length, rest data |
8 | ** each char encodes 6 bits, as follows: |
9 | ** binary: 01234567 abcdefgh ijklmnop |
10 | ** ascii: 012345 67abcd efghij klmnop |
11 | ** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc. |
12 | ** short binary data is zero-extended (so the bits are always in the |
13 | ** right place), this does *not* reflect in the length. |
14 | ** base64: |
15 | ** Line breaks are insignificant, but lines are at most 76 chars |
16 | ** each char encodes 6 bits, in similar order as uucode/hqx. Encoding |
17 | ** is done via a table. |
18 | ** Short binary data is filled (in ASCII) with '='. |
19 | ** hqx: |
20 | ** File starts with introductory text, real data starts and ends |
21 | ** with colons. |
22 | ** Data consists of three similar parts: info, datafork, resourcefork. |
23 | ** Each part is protected (at the end) with a 16-bit crc |
24 | ** The binary data is run-length encoded, and then ascii-fied: |
25 | ** binary: 01234567 abcdefgh ijklmnop |
26 | ** ascii: 012345 67abcd efghij klmnop |
27 | ** ASCII encoding is table-driven, see the code. |
28 | ** Short binary data results in the runt ascii-byte being output with |
29 | ** the bits in the right place. |
30 | ** |
31 | ** While I was reading dozens of programs that encode or decode the formats |
32 | ** here (documentation? hihi:-) I have formulated Jansen's Observation: |
33 | ** |
34 | ** Programs that encode binary data in ASCII are written in |
35 | ** such a style that they are as unreadable as possible. Devices used |
36 | ** include unnecessary global variables, burying important tables |
37 | ** in unrelated sourcefiles, putting functions in include files, |
38 | ** using seemingly-descriptive variable names for different purposes, |
39 | ** calls to empty subroutines and a host of others. |
40 | ** |
41 | ** I have attempted to break with this tradition, but I guess that that |
42 | ** does make the performance sub-optimal. Oh well, too bad... |
43 | ** |
44 | ** Jack Jansen, CWI, July 1995. |
45 | ** |
46 | ** Added support for quoted-printable encoding, based on rfc 1521 et al |
47 | ** quoted-printable encoding specifies that non printable characters (anything |
48 | ** below 32 and above 126) be encoded as =XX where XX is the hexadecimal value |
49 | ** of the character. It also specifies some other behavior to enable 8bit data |
50 | ** in a mail message with little difficulty (maximum line sizes, protecting |
51 | ** some cases of whitespace, etc). |
52 | ** |
53 | ** Brandon Long, September 2001. |
54 | */ |
55 | |
56 | #define PY_SSIZE_T_CLEAN |
57 | |
58 | #include "Python.h" |
59 | #include "pystrhex.h" |
60 | #ifdef USE_ZLIB_CRC32 |
61 | #include "zlib.h" |
62 | #endif |
63 | |
64 | typedef struct binascii_state { |
65 | PyObject *Error; |
66 | PyObject *Incomplete; |
67 | } binascii_state; |
68 | |
69 | static binascii_state * |
70 | get_binascii_state(PyObject *module) |
71 | { |
72 | return (binascii_state *)PyModule_GetState(module); |
73 | } |
74 | |
75 | /* |
76 | ** hqx lookup table, ascii->binary. |
77 | */ |
78 | |
79 | #define RUNCHAR 0x90 |
80 | |
81 | #define DONE 0x7F |
82 | #define SKIP 0x7E |
83 | #define FAIL 0x7D |
84 | |
85 | static const unsigned char table_a2b_hqx[256] = { |
86 | /* ^@ ^A ^B ^C ^D ^E ^F ^G */ |
87 | /* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
88 | /* \b \t \n ^K ^L \r ^N ^O */ |
89 | /* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL, |
90 | /* ^P ^Q ^R ^S ^T ^U ^V ^W */ |
91 | /* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
92 | /* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */ |
93 | /* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
94 | /* ! " # $ % & ' */ |
95 | /* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, |
96 | /* ( ) * + , - . / */ |
97 | /* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL, |
98 | /* 0 1 2 3 4 5 6 7 */ |
99 | /* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL, |
100 | /* 8 9 : ; < = > ? */ |
101 | /* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL, |
102 | /* @ A B C D E F G */ |
103 | /* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, |
104 | /* H I J K L M N O */ |
105 | /* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL, |
106 | /* P Q R S T U V W */ |
107 | /*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL, |
108 | /* X Y Z [ \ ] ^ _ */ |
109 | /*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL, |
110 | /* ` a b c d e f g */ |
111 | /*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL, |
112 | /* h i j k l m n o */ |
113 | /*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL, |
114 | /* p q r s t u v w */ |
115 | /*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL, |
116 | /* x y z { | } ~ ^? */ |
117 | /*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
118 | /*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
119 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
120 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
121 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
122 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
123 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
124 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
125 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
126 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
127 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
128 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
129 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
130 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
131 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
132 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
133 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
134 | }; |
135 | |
136 | static const unsigned char table_b2a_hqx[] = |
137 | "!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr" ; |
138 | |
139 | static const unsigned char table_a2b_base64[] = { |
140 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
141 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
142 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, |
143 | 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, /* Note PAD->0 */ |
144 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, |
145 | 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, |
146 | -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, |
147 | 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1, |
148 | |
149 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
150 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
151 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
152 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
153 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
154 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
155 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
156 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
157 | }; |
158 | |
159 | #define BASE64_PAD '=' |
160 | |
161 | /* Max binary chunk size; limited only by available memory */ |
162 | #define BASE64_MAXBIN ((PY_SSIZE_T_MAX - 3) / 2) |
163 | |
164 | static const unsigned char table_b2a_base64[] = |
165 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" ; |
166 | |
167 | |
168 | |
169 | static const unsigned short crctab_hqx[256] = { |
170 | 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, |
171 | 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, |
172 | 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, |
173 | 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, |
174 | 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, |
175 | 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, |
176 | 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, |
177 | 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, |
178 | 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, |
179 | 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, |
180 | 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, |
181 | 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, |
182 | 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, |
183 | 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, |
184 | 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, |
185 | 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, |
186 | 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, |
187 | 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, |
188 | 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, |
189 | 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, |
190 | 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, |
191 | 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, |
192 | 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, |
193 | 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, |
194 | 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, |
195 | 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, |
196 | 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, |
197 | 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, |
198 | 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, |
199 | 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, |
200 | 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, |
201 | 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, |
202 | }; |
203 | |
204 | /*[clinic input] |
205 | module binascii |
206 | [clinic start generated code]*/ |
207 | /*[clinic end generated code: output=da39a3ee5e6b4b0d input=de89fb46bcaf3fec]*/ |
208 | |
209 | /*[python input] |
210 | |
211 | class ascii_buffer_converter(CConverter): |
212 | type = 'Py_buffer' |
213 | converter = 'ascii_buffer_converter' |
214 | impl_by_reference = True |
215 | c_default = "{NULL, NULL}" |
216 | |
217 | def cleanup(self): |
218 | name = self.name |
219 | return "".join(["if (", name, ".obj)\n PyBuffer_Release(&", name, ");\n"]) |
220 | |
221 | [python start generated code]*/ |
222 | /*[python end generated code: output=da39a3ee5e6b4b0d input=3eb7b63610da92cd]*/ |
223 | |
224 | static int |
225 | ascii_buffer_converter(PyObject *arg, Py_buffer *buf) |
226 | { |
227 | if (arg == NULL) { |
228 | PyBuffer_Release(buf); |
229 | return 1; |
230 | } |
231 | if (PyUnicode_Check(arg)) { |
232 | if (PyUnicode_READY(arg) < 0) |
233 | return 0; |
234 | if (!PyUnicode_IS_ASCII(arg)) { |
235 | PyErr_SetString(PyExc_ValueError, |
236 | "string argument should contain only ASCII characters" ); |
237 | return 0; |
238 | } |
239 | assert(PyUnicode_KIND(arg) == PyUnicode_1BYTE_KIND); |
240 | buf->buf = (void *) PyUnicode_1BYTE_DATA(arg); |
241 | buf->len = PyUnicode_GET_LENGTH(arg); |
242 | buf->obj = NULL; |
243 | return 1; |
244 | } |
245 | if (PyObject_GetBuffer(arg, buf, PyBUF_SIMPLE) != 0) { |
246 | PyErr_Format(PyExc_TypeError, |
247 | "argument should be bytes, buffer or ASCII string, " |
248 | "not '%.100s'" , Py_TYPE(arg)->tp_name); |
249 | return 0; |
250 | } |
251 | if (!PyBuffer_IsContiguous(buf, 'C')) { |
252 | PyErr_Format(PyExc_TypeError, |
253 | "argument should be a contiguous buffer, " |
254 | "not '%.100s'" , Py_TYPE(arg)->tp_name); |
255 | PyBuffer_Release(buf); |
256 | return 0; |
257 | } |
258 | return Py_CLEANUP_SUPPORTED; |
259 | } |
260 | |
261 | #include "clinic/binascii.c.h" |
262 | |
263 | /*[clinic input] |
264 | binascii.a2b_uu |
265 | |
266 | data: ascii_buffer |
267 | / |
268 | |
269 | Decode a line of uuencoded data. |
270 | [clinic start generated code]*/ |
271 | |
272 | static PyObject * |
273 | binascii_a2b_uu_impl(PyObject *module, Py_buffer *data) |
274 | /*[clinic end generated code: output=e027f8e0b0598742 input=7cafeaf73df63d1c]*/ |
275 | { |
276 | const unsigned char *ascii_data; |
277 | unsigned char *bin_data; |
278 | int leftbits = 0; |
279 | unsigned char this_ch; |
280 | unsigned int leftchar = 0; |
281 | PyObject *rv; |
282 | Py_ssize_t ascii_len, bin_len; |
283 | binascii_state *state; |
284 | |
285 | ascii_data = data->buf; |
286 | ascii_len = data->len; |
287 | |
288 | assert(ascii_len >= 0); |
289 | |
290 | /* First byte: binary data length (in bytes) */ |
291 | bin_len = (*ascii_data++ - ' ') & 077; |
292 | ascii_len--; |
293 | |
294 | /* Allocate the buffer */ |
295 | if ( (rv=PyBytes_FromStringAndSize(NULL, bin_len)) == NULL ) |
296 | return NULL; |
297 | bin_data = (unsigned char *)PyBytes_AS_STRING(rv); |
298 | |
299 | for( ; bin_len > 0 ; ascii_len--, ascii_data++ ) { |
300 | /* XXX is it really best to add NULs if there's no more data */ |
301 | this_ch = (ascii_len > 0) ? *ascii_data : 0; |
302 | if ( this_ch == '\n' || this_ch == '\r' || ascii_len <= 0) { |
303 | /* |
304 | ** Whitespace. Assume some spaces got eaten at |
305 | ** end-of-line. (We check this later) |
306 | */ |
307 | this_ch = 0; |
308 | } else { |
309 | /* Check the character for legality |
310 | ** The 64 in stead of the expected 63 is because |
311 | ** there are a few uuencodes out there that use |
312 | ** '`' as zero instead of space. |
313 | */ |
314 | if ( this_ch < ' ' || this_ch > (' ' + 64)) { |
315 | state = PyModule_GetState(module); |
316 | if (state == NULL) { |
317 | return NULL; |
318 | } |
319 | PyErr_SetString(state->Error, "Illegal char" ); |
320 | Py_DECREF(rv); |
321 | return NULL; |
322 | } |
323 | this_ch = (this_ch - ' ') & 077; |
324 | } |
325 | /* |
326 | ** Shift it in on the low end, and see if there's |
327 | ** a byte ready for output. |
328 | */ |
329 | leftchar = (leftchar << 6) | (this_ch); |
330 | leftbits += 6; |
331 | if ( leftbits >= 8 ) { |
332 | leftbits -= 8; |
333 | *bin_data++ = (leftchar >> leftbits) & 0xff; |
334 | leftchar &= ((1 << leftbits) - 1); |
335 | bin_len--; |
336 | } |
337 | } |
338 | /* |
339 | ** Finally, check that if there's anything left on the line |
340 | ** that it's whitespace only. |
341 | */ |
342 | while( ascii_len-- > 0 ) { |
343 | this_ch = *ascii_data++; |
344 | /* Extra '`' may be written as padding in some cases */ |
345 | if ( this_ch != ' ' && this_ch != ' '+64 && |
346 | this_ch != '\n' && this_ch != '\r' ) { |
347 | state = PyModule_GetState(module); |
348 | if (state == NULL) { |
349 | return NULL; |
350 | } |
351 | PyErr_SetString(state->Error, "Trailing garbage" ); |
352 | Py_DECREF(rv); |
353 | return NULL; |
354 | } |
355 | } |
356 | return rv; |
357 | } |
358 | |
359 | /*[clinic input] |
360 | binascii.b2a_uu |
361 | |
362 | data: Py_buffer |
363 | / |
364 | * |
365 | backtick: bool(accept={int}) = False |
366 | |
367 | Uuencode line of data. |
368 | [clinic start generated code]*/ |
369 | |
370 | static PyObject * |
371 | binascii_b2a_uu_impl(PyObject *module, Py_buffer *data, int backtick) |
372 | /*[clinic end generated code: output=b1b99de62d9bbeb8 input=b26bc8d32b6ed2f6]*/ |
373 | { |
374 | unsigned char *ascii_data; |
375 | const unsigned char *bin_data; |
376 | int leftbits = 0; |
377 | unsigned char this_ch; |
378 | unsigned int leftchar = 0; |
379 | binascii_state *state; |
380 | Py_ssize_t bin_len, out_len; |
381 | _PyBytesWriter writer; |
382 | |
383 | _PyBytesWriter_Init(&writer); |
384 | bin_data = data->buf; |
385 | bin_len = data->len; |
386 | if ( bin_len > 45 ) { |
387 | /* The 45 is a limit that appears in all uuencode's */ |
388 | state = PyModule_GetState(module); |
389 | if (state == NULL) { |
390 | return NULL; |
391 | } |
392 | PyErr_SetString(state->Error, "At most 45 bytes at once" ); |
393 | return NULL; |
394 | } |
395 | |
396 | /* We're lazy and allocate to much (fixed up later) */ |
397 | out_len = 2 + (bin_len + 2) / 3 * 4; |
398 | ascii_data = _PyBytesWriter_Alloc(&writer, out_len); |
399 | if (ascii_data == NULL) |
400 | return NULL; |
401 | |
402 | /* Store the length */ |
403 | if (backtick && !bin_len) |
404 | *ascii_data++ = '`'; |
405 | else |
406 | *ascii_data++ = ' ' + (unsigned char)bin_len; |
407 | |
408 | for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) { |
409 | /* Shift the data (or padding) into our buffer */ |
410 | if ( bin_len > 0 ) /* Data */ |
411 | leftchar = (leftchar << 8) | *bin_data; |
412 | else /* Padding */ |
413 | leftchar <<= 8; |
414 | leftbits += 8; |
415 | |
416 | /* See if there are 6-bit groups ready */ |
417 | while ( leftbits >= 6 ) { |
418 | this_ch = (leftchar >> (leftbits-6)) & 0x3f; |
419 | leftbits -= 6; |
420 | if (backtick && !this_ch) |
421 | *ascii_data++ = '`'; |
422 | else |
423 | *ascii_data++ = this_ch + ' '; |
424 | } |
425 | } |
426 | *ascii_data++ = '\n'; /* Append a courtesy newline */ |
427 | |
428 | return _PyBytesWriter_Finish(&writer, ascii_data); |
429 | } |
430 | |
431 | /*[clinic input] |
432 | binascii.a2b_base64 |
433 | |
434 | data: ascii_buffer |
435 | / |
436 | |
437 | Decode a line of base64 data. |
438 | [clinic start generated code]*/ |
439 | |
440 | static PyObject * |
441 | binascii_a2b_base64_impl(PyObject *module, Py_buffer *data) |
442 | /*[clinic end generated code: output=0628223f19fd3f9b input=5872acf6e1cac243]*/ |
443 | { |
444 | assert(data->len >= 0); |
445 | |
446 | const unsigned char *ascii_data = data->buf; |
447 | size_t ascii_len = data->len; |
448 | |
449 | /* Allocate the buffer */ |
450 | Py_ssize_t bin_len = ((ascii_len+3)/4)*3; /* Upper bound, corrected later */ |
451 | _PyBytesWriter writer; |
452 | _PyBytesWriter_Init(&writer); |
453 | unsigned char *bin_data = _PyBytesWriter_Alloc(&writer, bin_len); |
454 | if (bin_data == NULL) |
455 | return NULL; |
456 | unsigned char *bin_data_start = bin_data; |
457 | |
458 | int quad_pos = 0; |
459 | unsigned char leftchar = 0; |
460 | int pads = 0; |
461 | for (size_t i = 0; i < ascii_len; i++) { |
462 | unsigned char this_ch = ascii_data[i]; |
463 | |
464 | /* Check for pad sequences and ignore |
465 | ** the invalid ones. |
466 | */ |
467 | if (this_ch == BASE64_PAD) { |
468 | if (quad_pos >= 2 && quad_pos + ++pads >= 4) { |
469 | /* A pad sequence means no more input. |
470 | ** We've already interpreted the data |
471 | ** from the quad at this point. |
472 | */ |
473 | goto done; |
474 | } |
475 | continue; |
476 | } |
477 | |
478 | this_ch = table_a2b_base64[this_ch]; |
479 | if (this_ch >= 64) { |
480 | continue; |
481 | } |
482 | pads = 0; |
483 | |
484 | switch (quad_pos) { |
485 | case 0: |
486 | quad_pos = 1; |
487 | leftchar = this_ch; |
488 | break; |
489 | case 1: |
490 | quad_pos = 2; |
491 | *bin_data++ = (leftchar << 2) | (this_ch >> 4); |
492 | leftchar = this_ch & 0x0f; |
493 | break; |
494 | case 2: |
495 | quad_pos = 3; |
496 | *bin_data++ = (leftchar << 4) | (this_ch >> 2); |
497 | leftchar = this_ch & 0x03; |
498 | break; |
499 | case 3: |
500 | quad_pos = 0; |
501 | *bin_data++ = (leftchar << 6) | (this_ch); |
502 | leftchar = 0; |
503 | break; |
504 | } |
505 | } |
506 | |
507 | if (quad_pos != 0) { |
508 | binascii_state *state = PyModule_GetState(module); |
509 | if (state == NULL) { |
510 | /* error already set, from PyModule_GetState */ |
511 | } else if (quad_pos == 1) { |
512 | /* |
513 | ** There is exactly one extra valid, non-padding, base64 character. |
514 | ** This is an invalid length, as there is no possible input that |
515 | ** could encoded into such a base64 string. |
516 | */ |
517 | PyErr_Format(state->Error, |
518 | "Invalid base64-encoded string: " |
519 | "number of data characters (%zd) cannot be 1 more " |
520 | "than a multiple of 4" , |
521 | (bin_data - bin_data_start) / 3 * 4 + 1); |
522 | } else { |
523 | PyErr_SetString(state->Error, "Incorrect padding" ); |
524 | } |
525 | _PyBytesWriter_Dealloc(&writer); |
526 | return NULL; |
527 | } |
528 | |
529 | done: |
530 | return _PyBytesWriter_Finish(&writer, bin_data); |
531 | } |
532 | |
533 | |
534 | /*[clinic input] |
535 | binascii.b2a_base64 |
536 | |
537 | data: Py_buffer |
538 | / |
539 | * |
540 | newline: bool(accept={int}) = True |
541 | |
542 | Base64-code line of data. |
543 | [clinic start generated code]*/ |
544 | |
545 | static PyObject * |
546 | binascii_b2a_base64_impl(PyObject *module, Py_buffer *data, int newline) |
547 | /*[clinic end generated code: output=4ad62c8e8485d3b3 input=6083dac5777fa45d]*/ |
548 | { |
549 | unsigned char *ascii_data; |
550 | const unsigned char *bin_data; |
551 | int leftbits = 0; |
552 | unsigned char this_ch; |
553 | unsigned int leftchar = 0; |
554 | Py_ssize_t bin_len, out_len; |
555 | _PyBytesWriter writer; |
556 | binascii_state *state; |
557 | |
558 | bin_data = data->buf; |
559 | bin_len = data->len; |
560 | _PyBytesWriter_Init(&writer); |
561 | |
562 | assert(bin_len >= 0); |
563 | |
564 | if ( bin_len > BASE64_MAXBIN ) { |
565 | state = PyModule_GetState(module); |
566 | if (state == NULL) { |
567 | return NULL; |
568 | } |
569 | PyErr_SetString(state->Error, "Too much data for base64 line" ); |
570 | return NULL; |
571 | } |
572 | |
573 | /* We're lazy and allocate too much (fixed up later). |
574 | "+2" leaves room for up to two pad characters. |
575 | Note that 'b' gets encoded as 'Yg==\n' (1 in, 5 out). */ |
576 | out_len = bin_len*2 + 2; |
577 | if (newline) |
578 | out_len++; |
579 | ascii_data = _PyBytesWriter_Alloc(&writer, out_len); |
580 | if (ascii_data == NULL) |
581 | return NULL; |
582 | |
583 | for( ; bin_len > 0 ; bin_len--, bin_data++ ) { |
584 | /* Shift the data into our buffer */ |
585 | leftchar = (leftchar << 8) | *bin_data; |
586 | leftbits += 8; |
587 | |
588 | /* See if there are 6-bit groups ready */ |
589 | while ( leftbits >= 6 ) { |
590 | this_ch = (leftchar >> (leftbits-6)) & 0x3f; |
591 | leftbits -= 6; |
592 | *ascii_data++ = table_b2a_base64[this_ch]; |
593 | } |
594 | } |
595 | if ( leftbits == 2 ) { |
596 | *ascii_data++ = table_b2a_base64[(leftchar&3) << 4]; |
597 | *ascii_data++ = BASE64_PAD; |
598 | *ascii_data++ = BASE64_PAD; |
599 | } else if ( leftbits == 4 ) { |
600 | *ascii_data++ = table_b2a_base64[(leftchar&0xf) << 2]; |
601 | *ascii_data++ = BASE64_PAD; |
602 | } |
603 | if (newline) |
604 | *ascii_data++ = '\n'; /* Append a courtesy newline */ |
605 | |
606 | return _PyBytesWriter_Finish(&writer, ascii_data); |
607 | } |
608 | |
609 | /*[clinic input] |
610 | binascii.a2b_hqx |
611 | |
612 | data: ascii_buffer |
613 | / |
614 | |
615 | Decode .hqx coding. |
616 | [clinic start generated code]*/ |
617 | |
618 | static PyObject * |
619 | binascii_a2b_hqx_impl(PyObject *module, Py_buffer *data) |
620 | /*[clinic end generated code: output=4d6d8c54d54ea1c1 input=0d914c680e0eed55]*/ |
621 | { |
622 | if (PyErr_WarnEx(PyExc_DeprecationWarning, |
623 | "binascii.a2b_hqx() is deprecated" , 1) < 0) { |
624 | return NULL; |
625 | } |
626 | |
627 | const unsigned char *ascii_data; |
628 | unsigned char *bin_data; |
629 | int leftbits = 0; |
630 | unsigned char this_ch; |
631 | unsigned int leftchar = 0; |
632 | PyObject *res; |
633 | Py_ssize_t len; |
634 | int done = 0; |
635 | _PyBytesWriter writer; |
636 | binascii_state *state; |
637 | |
638 | ascii_data = data->buf; |
639 | len = data->len; |
640 | _PyBytesWriter_Init(&writer); |
641 | |
642 | assert(len >= 0); |
643 | |
644 | if (len > PY_SSIZE_T_MAX - 2) |
645 | return PyErr_NoMemory(); |
646 | |
647 | /* Allocate a string that is too big (fixed later) |
648 | Add two to the initial length to prevent interning which |
649 | would preclude subsequent resizing. */ |
650 | bin_data = _PyBytesWriter_Alloc(&writer, len + 2); |
651 | if (bin_data == NULL) |
652 | return NULL; |
653 | |
654 | for( ; len > 0 ; len--, ascii_data++ ) { |
655 | /* Get the byte and look it up */ |
656 | this_ch = table_a2b_hqx[*ascii_data]; |
657 | if ( this_ch == SKIP ) |
658 | continue; |
659 | if ( this_ch == FAIL ) { |
660 | state = PyModule_GetState(module); |
661 | if (state == NULL) { |
662 | return NULL; |
663 | } |
664 | PyErr_SetString(state->Error, "Illegal char" ); |
665 | _PyBytesWriter_Dealloc(&writer); |
666 | return NULL; |
667 | } |
668 | if ( this_ch == DONE ) { |
669 | /* The terminating colon */ |
670 | done = 1; |
671 | break; |
672 | } |
673 | |
674 | /* Shift it into the buffer and see if any bytes are ready */ |
675 | leftchar = (leftchar << 6) | (this_ch); |
676 | leftbits += 6; |
677 | if ( leftbits >= 8 ) { |
678 | leftbits -= 8; |
679 | *bin_data++ = (leftchar >> leftbits) & 0xff; |
680 | leftchar &= ((1 << leftbits) - 1); |
681 | } |
682 | } |
683 | |
684 | if ( leftbits && !done ) { |
685 | state = PyModule_GetState(module); |
686 | if (state == NULL) { |
687 | return NULL; |
688 | } |
689 | PyErr_SetString(state->Incomplete, |
690 | "String has incomplete number of bytes" ); |
691 | _PyBytesWriter_Dealloc(&writer); |
692 | return NULL; |
693 | } |
694 | |
695 | res = _PyBytesWriter_Finish(&writer, bin_data); |
696 | if (res == NULL) |
697 | return NULL; |
698 | return Py_BuildValue("Ni" , res, done); |
699 | } |
700 | |
701 | |
702 | /*[clinic input] |
703 | binascii.rlecode_hqx |
704 | |
705 | data: Py_buffer |
706 | / |
707 | |
708 | Binhex RLE-code binary data. |
709 | [clinic start generated code]*/ |
710 | |
711 | static PyObject * |
712 | binascii_rlecode_hqx_impl(PyObject *module, Py_buffer *data) |
713 | /*[clinic end generated code: output=393d79338f5f5629 input=e1f1712447a82b09]*/ |
714 | { |
715 | if (PyErr_WarnEx(PyExc_DeprecationWarning, |
716 | "binascii.rlecode_hqx() is deprecated" , 1) < 0) { |
717 | return NULL; |
718 | } |
719 | |
720 | const unsigned char *in_data; |
721 | unsigned char *out_data; |
722 | unsigned char ch; |
723 | Py_ssize_t in, inend, len; |
724 | _PyBytesWriter writer; |
725 | |
726 | _PyBytesWriter_Init(&writer); |
727 | in_data = data->buf; |
728 | len = data->len; |
729 | |
730 | assert(len >= 0); |
731 | |
732 | if (len > PY_SSIZE_T_MAX / 2 - 2) |
733 | return PyErr_NoMemory(); |
734 | |
735 | /* Worst case: output is twice as big as input (fixed later) */ |
736 | out_data = _PyBytesWriter_Alloc(&writer, len * 2 + 2); |
737 | if (out_data == NULL) |
738 | return NULL; |
739 | |
740 | for( in=0; in<len; in++) { |
741 | ch = in_data[in]; |
742 | if ( ch == RUNCHAR ) { |
743 | /* RUNCHAR. Escape it. */ |
744 | *out_data++ = RUNCHAR; |
745 | *out_data++ = 0; |
746 | } else { |
747 | /* Check how many following are the same */ |
748 | for(inend=in+1; |
749 | inend<len && in_data[inend] == ch && |
750 | inend < in+255; |
751 | inend++) ; |
752 | if ( inend - in > 3 ) { |
753 | /* More than 3 in a row. Output RLE. */ |
754 | *out_data++ = ch; |
755 | *out_data++ = RUNCHAR; |
756 | *out_data++ = (unsigned char) (inend-in); |
757 | in = inend-1; |
758 | } else { |
759 | /* Less than 3. Output the byte itself */ |
760 | *out_data++ = ch; |
761 | } |
762 | } |
763 | } |
764 | |
765 | return _PyBytesWriter_Finish(&writer, out_data); |
766 | } |
767 | |
768 | |
769 | /*[clinic input] |
770 | binascii.b2a_hqx |
771 | |
772 | data: Py_buffer |
773 | / |
774 | |
775 | Encode .hqx data. |
776 | [clinic start generated code]*/ |
777 | |
778 | static PyObject * |
779 | binascii_b2a_hqx_impl(PyObject *module, Py_buffer *data) |
780 | /*[clinic end generated code: output=d0aa5a704bc9f7de input=9596ebe019fe12ba]*/ |
781 | { |
782 | if (PyErr_WarnEx(PyExc_DeprecationWarning, |
783 | "binascii.b2a_hqx() is deprecated" , 1) < 0) { |
784 | return NULL; |
785 | } |
786 | |
787 | unsigned char *ascii_data; |
788 | const unsigned char *bin_data; |
789 | int leftbits = 0; |
790 | unsigned char this_ch; |
791 | unsigned int leftchar = 0; |
792 | Py_ssize_t len; |
793 | _PyBytesWriter writer; |
794 | |
795 | bin_data = data->buf; |
796 | len = data->len; |
797 | _PyBytesWriter_Init(&writer); |
798 | |
799 | assert(len >= 0); |
800 | |
801 | if (len > PY_SSIZE_T_MAX / 2 - 2) |
802 | return PyErr_NoMemory(); |
803 | |
804 | /* Allocate a buffer that is at least large enough */ |
805 | ascii_data = _PyBytesWriter_Alloc(&writer, len * 2 + 2); |
806 | if (ascii_data == NULL) |
807 | return NULL; |
808 | |
809 | for( ; len > 0 ; len--, bin_data++ ) { |
810 | /* Shift into our buffer, and output any 6bits ready */ |
811 | leftchar = (leftchar << 8) | *bin_data; |
812 | leftbits += 8; |
813 | while ( leftbits >= 6 ) { |
814 | this_ch = (leftchar >> (leftbits-6)) & 0x3f; |
815 | leftbits -= 6; |
816 | *ascii_data++ = table_b2a_hqx[this_ch]; |
817 | } |
818 | } |
819 | /* Output a possible runt byte */ |
820 | if ( leftbits ) { |
821 | leftchar <<= (6-leftbits); |
822 | *ascii_data++ = table_b2a_hqx[leftchar & 0x3f]; |
823 | } |
824 | |
825 | return _PyBytesWriter_Finish(&writer, ascii_data); |
826 | } |
827 | |
828 | |
829 | /*[clinic input] |
830 | binascii.rledecode_hqx |
831 | |
832 | data: Py_buffer |
833 | / |
834 | |
835 | Decode hexbin RLE-coded string. |
836 | [clinic start generated code]*/ |
837 | |
838 | static PyObject * |
839 | binascii_rledecode_hqx_impl(PyObject *module, Py_buffer *data) |
840 | /*[clinic end generated code: output=9826619565de1c6c input=54cdd49fc014402c]*/ |
841 | { |
842 | if (PyErr_WarnEx(PyExc_DeprecationWarning, |
843 | "binascii.rledecode_hqx() is deprecated" , 1) < 0) { |
844 | return NULL; |
845 | } |
846 | |
847 | const unsigned char *in_data; |
848 | unsigned char *out_data; |
849 | unsigned char in_byte, in_repeat; |
850 | Py_ssize_t in_len; |
851 | _PyBytesWriter writer; |
852 | |
853 | in_data = data->buf; |
854 | in_len = data->len; |
855 | _PyBytesWriter_Init(&writer); |
856 | binascii_state *state; |
857 | |
858 | assert(in_len >= 0); |
859 | |
860 | /* Empty string is a special case */ |
861 | if ( in_len == 0 ) |
862 | return PyBytes_FromStringAndSize("" , 0); |
863 | else if (in_len > PY_SSIZE_T_MAX / 2) |
864 | return PyErr_NoMemory(); |
865 | |
866 | /* Allocate a buffer of reasonable size. Resized when needed */ |
867 | out_data = _PyBytesWriter_Alloc(&writer, in_len); |
868 | if (out_data == NULL) |
869 | return NULL; |
870 | |
871 | /* Use overallocation */ |
872 | writer.overallocate = 1; |
873 | |
874 | /* |
875 | ** We need two macros here to get/put bytes and handle |
876 | ** end-of-buffer for input and output strings. |
877 | */ |
878 | #define INBYTE(b) \ |
879 | do { \ |
880 | if ( --in_len < 0 ) { \ |
881 | state = PyModule_GetState(module); \ |
882 | if (state == NULL) { \ |
883 | return NULL; \ |
884 | } \ |
885 | PyErr_SetString(state->Incomplete, ""); \ |
886 | goto error; \ |
887 | } \ |
888 | b = *in_data++; \ |
889 | } while(0) |
890 | |
891 | /* |
892 | ** Handle first byte separately (since we have to get angry |
893 | ** in case of an orphaned RLE code). |
894 | */ |
895 | INBYTE(in_byte); |
896 | |
897 | if (in_byte == RUNCHAR) { |
898 | INBYTE(in_repeat); |
899 | /* only 1 byte will be written, but 2 bytes were preallocated: |
900 | subtract 1 byte to prevent overallocation */ |
901 | writer.min_size--; |
902 | |
903 | if (in_repeat != 0) { |
904 | /* Note Error, not Incomplete (which is at the end |
905 | ** of the string only). This is a programmer error. |
906 | */ |
907 | state = PyModule_GetState(module); |
908 | if (state == NULL) { |
909 | return NULL; |
910 | } |
911 | PyErr_SetString(state->Error, "Orphaned RLE code at start" ); |
912 | goto error; |
913 | } |
914 | *out_data++ = RUNCHAR; |
915 | } else { |
916 | *out_data++ = in_byte; |
917 | } |
918 | |
919 | while( in_len > 0 ) { |
920 | INBYTE(in_byte); |
921 | |
922 | if (in_byte == RUNCHAR) { |
923 | INBYTE(in_repeat); |
924 | /* only 1 byte will be written, but 2 bytes were preallocated: |
925 | subtract 1 byte to prevent overallocation */ |
926 | writer.min_size--; |
927 | |
928 | if ( in_repeat == 0 ) { |
929 | /* Just an escaped RUNCHAR value */ |
930 | *out_data++ = RUNCHAR; |
931 | } else { |
932 | /* Pick up value and output a sequence of it */ |
933 | in_byte = out_data[-1]; |
934 | |
935 | /* enlarge the buffer if needed */ |
936 | if (in_repeat > 1) { |
937 | /* -1 because we already preallocated 1 byte */ |
938 | out_data = _PyBytesWriter_Prepare(&writer, out_data, |
939 | in_repeat - 1); |
940 | if (out_data == NULL) |
941 | goto error; |
942 | } |
943 | |
944 | while ( --in_repeat > 0 ) |
945 | *out_data++ = in_byte; |
946 | } |
947 | } else { |
948 | /* Normal byte */ |
949 | *out_data++ = in_byte; |
950 | } |
951 | } |
952 | return _PyBytesWriter_Finish(&writer, out_data); |
953 | |
954 | error: |
955 | _PyBytesWriter_Dealloc(&writer); |
956 | return NULL; |
957 | } |
958 | |
959 | |
960 | /*[clinic input] |
961 | binascii.crc_hqx |
962 | |
963 | data: Py_buffer |
964 | crc: unsigned_int(bitwise=True) |
965 | / |
966 | |
967 | Compute CRC-CCITT incrementally. |
968 | [clinic start generated code]*/ |
969 | |
970 | static PyObject * |
971 | binascii_crc_hqx_impl(PyObject *module, Py_buffer *data, unsigned int crc) |
972 | /*[clinic end generated code: output=2fde213d0f547a98 input=56237755370a951c]*/ |
973 | { |
974 | const unsigned char *bin_data; |
975 | Py_ssize_t len; |
976 | |
977 | crc &= 0xffff; |
978 | bin_data = data->buf; |
979 | len = data->len; |
980 | |
981 | while(len-- > 0) { |
982 | crc = ((crc<<8)&0xff00) ^ crctab_hqx[(crc>>8)^*bin_data++]; |
983 | } |
984 | |
985 | return PyLong_FromUnsignedLong(crc); |
986 | } |
987 | |
988 | #ifndef USE_ZLIB_CRC32 |
989 | /* Crc - 32 BIT ANSI X3.66 CRC checksum files |
990 | Also known as: ISO 3307 |
991 | **********************************************************************| |
992 | * *| |
993 | * Demonstration program to compute the 32-bit CRC used as the frame *| |
994 | * check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 *| |
995 | * and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level *| |
996 | * protocol). The 32-bit FCS was added via the Federal Register, *| |
997 | * 1 June 1982, p.23798. I presume but don't know for certain that *| |
998 | * this polynomial is or will be included in CCITT V.41, which *| |
999 | * defines the 16-bit CRC (often called CRC-CCITT) polynomial. FIPS *| |
1000 | * PUB 78 says that the 32-bit FCS reduces otherwise undetected *| |
1001 | * errors by a factor of 10^-5 over 16-bit FCS. *| |
1002 | * *| |
1003 | **********************************************************************| |
1004 | |
1005 | Copyright (C) 1986 Gary S. Brown. You may use this program, or |
1006 | code or tables extracted from it, as desired without restriction. |
1007 | |
1008 | First, the polynomial itself and its table of feedback terms. The |
1009 | polynomial is |
1010 | X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 |
1011 | Note that we take it "backwards" and put the highest-order term in |
1012 | the lowest-order bit. The X^32 term is "implied"; the LSB is the |
1013 | X^31 term, etc. The X^0 term (usually shown as "+1") results in |
1014 | the MSB being 1. |
1015 | |
1016 | Note that the usual hardware shift register implementation, which |
1017 | is what we're using (we're merely optimizing it by doing eight-bit |
1018 | chunks at a time) shifts bits into the lowest-order term. In our |
1019 | implementation, that means shifting towards the right. Why do we |
1020 | do it this way? Because the calculated CRC must be transmitted in |
1021 | order from highest-order term to lowest-order term. UARTs transmit |
1022 | characters in order from LSB to MSB. By storing the CRC this way, |
1023 | we hand it to the UART in the order low-byte to high-byte; the UART |
1024 | sends each low-bit to hight-bit; and the result is transmission bit |
1025 | by bit from highest- to lowest-order term without requiring any bit |
1026 | shuffling on our part. Reception works similarly. |
1027 | |
1028 | The feedback terms table consists of 256, 32-bit entries. Notes: |
1029 | |
1030 | 1. The table can be generated at runtime if desired; code to do so |
1031 | is shown later. It might not be obvious, but the feedback |
1032 | terms simply represent the results of eight shift/xor opera- |
1033 | tions for all combinations of data and CRC register values. |
1034 | |
1035 | 2. The CRC accumulation logic is the same for all CRC polynomials, |
1036 | be they sixteen or thirty-two bits wide. You simply choose the |
1037 | appropriate table. Alternatively, because the table can be |
1038 | generated at runtime, you can start by generating the table for |
1039 | the polynomial in question and use exactly the same "updcrc", |
1040 | if your application needn't simultaneously handle two CRC |
1041 | polynomials. (Note, however, that XMODEM is strange.) |
1042 | |
1043 | 3. For 16-bit CRCs, the table entries need be only 16 bits wide; |
1044 | of course, 32-bit entries work OK if the high 16 bits are zero. |
1045 | |
1046 | 4. The values must be right-shifted by eight bits by the "updcrc" |
1047 | logic; the shift must be unsigned (bring in zeroes). On some |
1048 | hardware you could probably optimize the shift in assembler by |
1049 | using byte-swap instructions. |
1050 | ********************************************************************/ |
1051 | |
1052 | static const unsigned int crc_32_tab[256] = { |
1053 | 0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U, |
1054 | 0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U, |
1055 | 0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U, |
1056 | 0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU, |
1057 | 0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U, |
1058 | 0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U, |
1059 | 0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U, |
1060 | 0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU, |
1061 | 0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U, |
1062 | 0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU, |
1063 | 0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U, |
1064 | 0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U, |
1065 | 0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U, |
1066 | 0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU, |
1067 | 0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU, |
1068 | 0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U, |
1069 | 0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU, |
1070 | 0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U, |
1071 | 0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U, |
1072 | 0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U, |
1073 | 0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU, |
1074 | 0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U, |
1075 | 0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U, |
1076 | 0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU, |
1077 | 0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U, |
1078 | 0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U, |
1079 | 0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U, |
1080 | 0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U, |
1081 | 0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U, |
1082 | 0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU, |
1083 | 0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU, |
1084 | 0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U, |
1085 | 0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U, |
1086 | 0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU, |
1087 | 0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU, |
1088 | 0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U, |
1089 | 0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU, |
1090 | 0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U, |
1091 | 0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU, |
1092 | 0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U, |
1093 | 0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU, |
1094 | 0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U, |
1095 | 0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U, |
1096 | 0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU, |
1097 | 0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U, |
1098 | 0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U, |
1099 | 0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U, |
1100 | 0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U, |
1101 | 0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U, |
1102 | 0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U, |
1103 | 0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU, |
1104 | 0x2d02ef8dU |
1105 | }; |
1106 | #endif /* USE_ZLIB_CRC32 */ |
1107 | |
1108 | /*[clinic input] |
1109 | binascii.crc32 -> unsigned_int |
1110 | |
1111 | data: Py_buffer |
1112 | crc: unsigned_int(bitwise=True) = 0 |
1113 | / |
1114 | |
1115 | Compute CRC-32 incrementally. |
1116 | [clinic start generated code]*/ |
1117 | |
1118 | static unsigned int |
1119 | binascii_crc32_impl(PyObject *module, Py_buffer *data, unsigned int crc) |
1120 | /*[clinic end generated code: output=52cf59056a78593b input=bbe340bc99d25aa8]*/ |
1121 | |
1122 | #ifdef USE_ZLIB_CRC32 |
1123 | /* The same core as zlibmodule.c zlib_crc32_impl. */ |
1124 | { |
1125 | unsigned char *buf = data->buf; |
1126 | Py_ssize_t len = data->len; |
1127 | |
1128 | /* Avoid truncation of length for very large buffers. crc32() takes |
1129 | length as an unsigned int, which may be narrower than Py_ssize_t. */ |
1130 | while ((size_t)len > UINT_MAX) { |
1131 | crc = crc32(crc, buf, UINT_MAX); |
1132 | buf += (size_t) UINT_MAX; |
1133 | len -= (size_t) UINT_MAX; |
1134 | } |
1135 | crc = crc32(crc, buf, (unsigned int)len); |
1136 | return crc & 0xffffffff; |
1137 | } |
1138 | #else /* USE_ZLIB_CRC32 */ |
1139 | { /* By Jim Ahlstrom; All rights transferred to CNRI */ |
1140 | const unsigned char *bin_data; |
1141 | Py_ssize_t len; |
1142 | unsigned int result; |
1143 | |
1144 | bin_data = data->buf; |
1145 | len = data->len; |
1146 | |
1147 | crc = ~ crc; |
1148 | while (len-- > 0) { |
1149 | crc = crc_32_tab[(crc ^ *bin_data++) & 0xff] ^ (crc >> 8); |
1150 | /* Note: (crc >> 8) MUST zero fill on left */ |
1151 | } |
1152 | |
1153 | result = (crc ^ 0xFFFFFFFF); |
1154 | return result & 0xffffffff; |
1155 | } |
1156 | #endif /* USE_ZLIB_CRC32 */ |
1157 | |
1158 | /*[clinic input] |
1159 | binascii.b2a_hex |
1160 | |
1161 | data: Py_buffer |
1162 | sep: object = NULL |
1163 | An optional single character or byte to separate hex bytes. |
1164 | bytes_per_sep: int = 1 |
1165 | How many bytes between separators. Positive values count from the |
1166 | right, negative values count from the left. |
1167 | |
1168 | Hexadecimal representation of binary data. |
1169 | |
1170 | The return value is a bytes object. This function is also |
1171 | available as "hexlify()". |
1172 | |
1173 | Example: |
1174 | >>> binascii.b2a_hex(b'\xb9\x01\xef') |
1175 | b'b901ef' |
1176 | >>> binascii.hexlify(b'\xb9\x01\xef', ':') |
1177 | b'b9:01:ef' |
1178 | >>> binascii.b2a_hex(b'\xb9\x01\xef', b'_', 2) |
1179 | b'b9_01ef' |
1180 | [clinic start generated code]*/ |
1181 | |
1182 | static PyObject * |
1183 | binascii_b2a_hex_impl(PyObject *module, Py_buffer *data, PyObject *sep, |
1184 | int bytes_per_sep) |
1185 | /*[clinic end generated code: output=a26937946a81d2c7 input=ec0ade6ba2e43543]*/ |
1186 | { |
1187 | return _Py_strhex_bytes_with_sep((const char *)data->buf, data->len, |
1188 | sep, bytes_per_sep); |
1189 | } |
1190 | |
1191 | /*[clinic input] |
1192 | binascii.hexlify = binascii.b2a_hex |
1193 | |
1194 | Hexadecimal representation of binary data. |
1195 | |
1196 | The return value is a bytes object. This function is also |
1197 | available as "b2a_hex()". |
1198 | [clinic start generated code]*/ |
1199 | |
1200 | static PyObject * |
1201 | binascii_hexlify_impl(PyObject *module, Py_buffer *data, PyObject *sep, |
1202 | int bytes_per_sep) |
1203 | /*[clinic end generated code: output=d12aa1b001b15199 input=bc317bd4e241f76b]*/ |
1204 | { |
1205 | return _Py_strhex_bytes_with_sep((const char *)data->buf, data->len, |
1206 | sep, bytes_per_sep); |
1207 | } |
1208 | |
1209 | /*[clinic input] |
1210 | binascii.a2b_hex |
1211 | |
1212 | hexstr: ascii_buffer |
1213 | / |
1214 | |
1215 | Binary data of hexadecimal representation. |
1216 | |
1217 | hexstr must contain an even number of hex digits (upper or lower case). |
1218 | This function is also available as "unhexlify()". |
1219 | [clinic start generated code]*/ |
1220 | |
1221 | static PyObject * |
1222 | binascii_a2b_hex_impl(PyObject *module, Py_buffer *hexstr) |
1223 | /*[clinic end generated code: output=0cc1a139af0eeecb input=9e1e7f2f94db24fd]*/ |
1224 | { |
1225 | const char* argbuf; |
1226 | Py_ssize_t arglen; |
1227 | PyObject *retval; |
1228 | char* retbuf; |
1229 | Py_ssize_t i, j; |
1230 | binascii_state *state; |
1231 | |
1232 | argbuf = hexstr->buf; |
1233 | arglen = hexstr->len; |
1234 | |
1235 | assert(arglen >= 0); |
1236 | |
1237 | /* XXX What should we do about strings with an odd length? Should |
1238 | * we add an implicit leading zero, or a trailing zero? For now, |
1239 | * raise an exception. |
1240 | */ |
1241 | if (arglen % 2) { |
1242 | state = PyModule_GetState(module); |
1243 | if (state == NULL) { |
1244 | return NULL; |
1245 | } |
1246 | PyErr_SetString(state->Error, "Odd-length string" ); |
1247 | return NULL; |
1248 | } |
1249 | |
1250 | retval = PyBytes_FromStringAndSize(NULL, (arglen/2)); |
1251 | if (!retval) |
1252 | return NULL; |
1253 | retbuf = PyBytes_AS_STRING(retval); |
1254 | |
1255 | for (i=j=0; i < arglen; i += 2) { |
1256 | unsigned int top = _PyLong_DigitValue[Py_CHARMASK(argbuf[i])]; |
1257 | unsigned int bot = _PyLong_DigitValue[Py_CHARMASK(argbuf[i+1])]; |
1258 | if (top >= 16 || bot >= 16) { |
1259 | state = PyModule_GetState(module); |
1260 | if (state == NULL) { |
1261 | return NULL; |
1262 | } |
1263 | PyErr_SetString(state->Error, |
1264 | "Non-hexadecimal digit found" ); |
1265 | goto finally; |
1266 | } |
1267 | retbuf[j++] = (top << 4) + bot; |
1268 | } |
1269 | return retval; |
1270 | |
1271 | finally: |
1272 | Py_DECREF(retval); |
1273 | return NULL; |
1274 | } |
1275 | |
1276 | /*[clinic input] |
1277 | binascii.unhexlify = binascii.a2b_hex |
1278 | |
1279 | Binary data of hexadecimal representation. |
1280 | |
1281 | hexstr must contain an even number of hex digits (upper or lower case). |
1282 | [clinic start generated code]*/ |
1283 | |
1284 | static PyObject * |
1285 | binascii_unhexlify_impl(PyObject *module, Py_buffer *hexstr) |
1286 | /*[clinic end generated code: output=51a64c06c79629e3 input=dd8c012725f462da]*/ |
1287 | { |
1288 | return binascii_a2b_hex_impl(module, hexstr); |
1289 | } |
1290 | |
1291 | #define MAXLINESIZE 76 |
1292 | |
1293 | |
1294 | /*[clinic input] |
1295 | binascii.a2b_qp |
1296 | |
1297 | data: ascii_buffer |
1298 | header: bool(accept={int}) = False |
1299 | |
1300 | Decode a string of qp-encoded data. |
1301 | [clinic start generated code]*/ |
1302 | |
1303 | static PyObject * |
1304 | binascii_a2b_qp_impl(PyObject *module, Py_buffer *data, int ) |
1305 | /*[clinic end generated code: output=e99f7846cfb9bc53 input=bf6766fea76cce8f]*/ |
1306 | { |
1307 | Py_ssize_t in, out; |
1308 | char ch; |
1309 | const unsigned char *ascii_data; |
1310 | unsigned char *odata; |
1311 | Py_ssize_t datalen = 0; |
1312 | PyObject *rv; |
1313 | |
1314 | ascii_data = data->buf; |
1315 | datalen = data->len; |
1316 | |
1317 | /* We allocate the output same size as input, this is overkill. |
1318 | */ |
1319 | odata = (unsigned char *) PyMem_Calloc(1, datalen); |
1320 | if (odata == NULL) { |
1321 | PyErr_NoMemory(); |
1322 | return NULL; |
1323 | } |
1324 | |
1325 | in = out = 0; |
1326 | while (in < datalen) { |
1327 | if (ascii_data[in] == '=') { |
1328 | in++; |
1329 | if (in >= datalen) break; |
1330 | /* Soft line breaks */ |
1331 | if ((ascii_data[in] == '\n') || (ascii_data[in] == '\r')) { |
1332 | if (ascii_data[in] != '\n') { |
1333 | while (in < datalen && ascii_data[in] != '\n') in++; |
1334 | } |
1335 | if (in < datalen) in++; |
1336 | } |
1337 | else if (ascii_data[in] == '=') { |
1338 | /* broken case from broken python qp */ |
1339 | odata[out++] = '='; |
1340 | in++; |
1341 | } |
1342 | else if ((in + 1 < datalen) && |
1343 | ((ascii_data[in] >= 'A' && ascii_data[in] <= 'F') || |
1344 | (ascii_data[in] >= 'a' && ascii_data[in] <= 'f') || |
1345 | (ascii_data[in] >= '0' && ascii_data[in] <= '9')) && |
1346 | ((ascii_data[in+1] >= 'A' && ascii_data[in+1] <= 'F') || |
1347 | (ascii_data[in+1] >= 'a' && ascii_data[in+1] <= 'f') || |
1348 | (ascii_data[in+1] >= '0' && ascii_data[in+1] <= '9'))) { |
1349 | /* hexval */ |
1350 | ch = _PyLong_DigitValue[ascii_data[in]] << 4; |
1351 | in++; |
1352 | ch |= _PyLong_DigitValue[ascii_data[in]]; |
1353 | in++; |
1354 | odata[out++] = ch; |
1355 | } |
1356 | else { |
1357 | odata[out++] = '='; |
1358 | } |
1359 | } |
1360 | else if (header && ascii_data[in] == '_') { |
1361 | odata[out++] = ' '; |
1362 | in++; |
1363 | } |
1364 | else { |
1365 | odata[out] = ascii_data[in]; |
1366 | in++; |
1367 | out++; |
1368 | } |
1369 | } |
1370 | if ((rv = PyBytes_FromStringAndSize((char *)odata, out)) == NULL) { |
1371 | PyMem_Free(odata); |
1372 | return NULL; |
1373 | } |
1374 | PyMem_Free(odata); |
1375 | return rv; |
1376 | } |
1377 | |
1378 | static int |
1379 | to_hex (unsigned char ch, unsigned char *s) |
1380 | { |
1381 | unsigned int uvalue = ch; |
1382 | |
1383 | s[1] = "0123456789ABCDEF" [uvalue % 16]; |
1384 | uvalue = (uvalue / 16); |
1385 | s[0] = "0123456789ABCDEF" [uvalue % 16]; |
1386 | return 0; |
1387 | } |
1388 | |
1389 | /* XXX: This is ridiculously complicated to be backward compatible |
1390 | * (mostly) with the quopri module. It doesn't re-create the quopri |
1391 | * module bug where text ending in CRLF has the CR encoded */ |
1392 | |
1393 | /*[clinic input] |
1394 | binascii.b2a_qp |
1395 | |
1396 | data: Py_buffer |
1397 | quotetabs: bool(accept={int}) = False |
1398 | istext: bool(accept={int}) = True |
1399 | header: bool(accept={int}) = False |
1400 | |
1401 | Encode a string using quoted-printable encoding. |
1402 | |
1403 | On encoding, when istext is set, newlines are not encoded, and white |
1404 | space at end of lines is. When istext is not set, \r and \n (CR/LF) |
1405 | are both encoded. When quotetabs is set, space and tabs are encoded. |
1406 | [clinic start generated code]*/ |
1407 | |
1408 | static PyObject * |
1409 | binascii_b2a_qp_impl(PyObject *module, Py_buffer *data, int quotetabs, |
1410 | int istext, int ) |
1411 | /*[clinic end generated code: output=e9884472ebb1a94c input=21fb7eea4a184ba6]*/ |
1412 | { |
1413 | Py_ssize_t in, out; |
1414 | const unsigned char *databuf; |
1415 | unsigned char *odata; |
1416 | Py_ssize_t datalen = 0, odatalen = 0; |
1417 | PyObject *rv; |
1418 | unsigned int linelen = 0; |
1419 | unsigned char ch; |
1420 | int crlf = 0; |
1421 | const unsigned char *p; |
1422 | |
1423 | databuf = data->buf; |
1424 | datalen = data->len; |
1425 | |
1426 | /* See if this string is using CRLF line ends */ |
1427 | /* XXX: this function has the side effect of converting all of |
1428 | * the end of lines to be the same depending on this detection |
1429 | * here */ |
1430 | p = (const unsigned char *) memchr(databuf, '\n', datalen); |
1431 | if ((p != NULL) && (p > databuf) && (*(p-1) == '\r')) |
1432 | crlf = 1; |
1433 | |
1434 | /* First, scan to see how many characters need to be encoded */ |
1435 | in = 0; |
1436 | while (in < datalen) { |
1437 | Py_ssize_t delta = 0; |
1438 | if ((databuf[in] > 126) || |
1439 | (databuf[in] == '=') || |
1440 | (header && databuf[in] == '_') || |
1441 | ((databuf[in] == '.') && (linelen == 0) && |
1442 | (in + 1 == datalen || databuf[in+1] == '\n' || |
1443 | databuf[in+1] == '\r' || databuf[in+1] == 0)) || |
1444 | (!istext && ((databuf[in] == '\r') || (databuf[in] == '\n'))) || |
1445 | ((databuf[in] == '\t' || databuf[in] == ' ') && (in + 1 == datalen)) || |
1446 | ((databuf[in] < 33) && |
1447 | (databuf[in] != '\r') && (databuf[in] != '\n') && |
1448 | (quotetabs || ((databuf[in] != '\t') && (databuf[in] != ' '))))) |
1449 | { |
1450 | if ((linelen + 3) >= MAXLINESIZE) { |
1451 | linelen = 0; |
1452 | if (crlf) |
1453 | delta += 3; |
1454 | else |
1455 | delta += 2; |
1456 | } |
1457 | linelen += 3; |
1458 | delta += 3; |
1459 | in++; |
1460 | } |
1461 | else { |
1462 | if (istext && |
1463 | ((databuf[in] == '\n') || |
1464 | ((in+1 < datalen) && (databuf[in] == '\r') && |
1465 | (databuf[in+1] == '\n')))) |
1466 | { |
1467 | linelen = 0; |
1468 | /* Protect against whitespace on end of line */ |
1469 | if (in && ((databuf[in-1] == ' ') || (databuf[in-1] == '\t'))) |
1470 | delta += 2; |
1471 | if (crlf) |
1472 | delta += 2; |
1473 | else |
1474 | delta += 1; |
1475 | if (databuf[in] == '\r') |
1476 | in += 2; |
1477 | else |
1478 | in++; |
1479 | } |
1480 | else { |
1481 | if ((in + 1 != datalen) && |
1482 | (databuf[in+1] != '\n') && |
1483 | (linelen + 1) >= MAXLINESIZE) { |
1484 | linelen = 0; |
1485 | if (crlf) |
1486 | delta += 3; |
1487 | else |
1488 | delta += 2; |
1489 | } |
1490 | linelen++; |
1491 | delta++; |
1492 | in++; |
1493 | } |
1494 | } |
1495 | if (PY_SSIZE_T_MAX - delta < odatalen) { |
1496 | PyErr_NoMemory(); |
1497 | return NULL; |
1498 | } |
1499 | odatalen += delta; |
1500 | } |
1501 | |
1502 | /* We allocate the output same size as input, this is overkill. |
1503 | */ |
1504 | odata = (unsigned char *) PyMem_Calloc(1, odatalen); |
1505 | if (odata == NULL) { |
1506 | PyErr_NoMemory(); |
1507 | return NULL; |
1508 | } |
1509 | |
1510 | in = out = linelen = 0; |
1511 | while (in < datalen) { |
1512 | if ((databuf[in] > 126) || |
1513 | (databuf[in] == '=') || |
1514 | (header && databuf[in] == '_') || |
1515 | ((databuf[in] == '.') && (linelen == 0) && |
1516 | (in + 1 == datalen || databuf[in+1] == '\n' || |
1517 | databuf[in+1] == '\r' || databuf[in+1] == 0)) || |
1518 | (!istext && ((databuf[in] == '\r') || (databuf[in] == '\n'))) || |
1519 | ((databuf[in] == '\t' || databuf[in] == ' ') && (in + 1 == datalen)) || |
1520 | ((databuf[in] < 33) && |
1521 | (databuf[in] != '\r') && (databuf[in] != '\n') && |
1522 | (quotetabs || ((databuf[in] != '\t') && (databuf[in] != ' '))))) |
1523 | { |
1524 | if ((linelen + 3 )>= MAXLINESIZE) { |
1525 | odata[out++] = '='; |
1526 | if (crlf) odata[out++] = '\r'; |
1527 | odata[out++] = '\n'; |
1528 | linelen = 0; |
1529 | } |
1530 | odata[out++] = '='; |
1531 | to_hex(databuf[in], &odata[out]); |
1532 | out += 2; |
1533 | in++; |
1534 | linelen += 3; |
1535 | } |
1536 | else { |
1537 | if (istext && |
1538 | ((databuf[in] == '\n') || |
1539 | ((in+1 < datalen) && (databuf[in] == '\r') && |
1540 | (databuf[in+1] == '\n')))) |
1541 | { |
1542 | linelen = 0; |
1543 | /* Protect against whitespace on end of line */ |
1544 | if (out && ((odata[out-1] == ' ') || (odata[out-1] == '\t'))) { |
1545 | ch = odata[out-1]; |
1546 | odata[out-1] = '='; |
1547 | to_hex(ch, &odata[out]); |
1548 | out += 2; |
1549 | } |
1550 | |
1551 | if (crlf) odata[out++] = '\r'; |
1552 | odata[out++] = '\n'; |
1553 | if (databuf[in] == '\r') |
1554 | in += 2; |
1555 | else |
1556 | in++; |
1557 | } |
1558 | else { |
1559 | if ((in + 1 != datalen) && |
1560 | (databuf[in+1] != '\n') && |
1561 | (linelen + 1) >= MAXLINESIZE) { |
1562 | odata[out++] = '='; |
1563 | if (crlf) odata[out++] = '\r'; |
1564 | odata[out++] = '\n'; |
1565 | linelen = 0; |
1566 | } |
1567 | linelen++; |
1568 | if (header && databuf[in] == ' ') { |
1569 | odata[out++] = '_'; |
1570 | in++; |
1571 | } |
1572 | else { |
1573 | odata[out++] = databuf[in++]; |
1574 | } |
1575 | } |
1576 | } |
1577 | } |
1578 | if ((rv = PyBytes_FromStringAndSize((char *)odata, out)) == NULL) { |
1579 | PyMem_Free(odata); |
1580 | return NULL; |
1581 | } |
1582 | PyMem_Free(odata); |
1583 | return rv; |
1584 | } |
1585 | |
1586 | /* List of functions defined in the module */ |
1587 | |
1588 | static struct PyMethodDef binascii_module_methods[] = { |
1589 | BINASCII_A2B_UU_METHODDEF |
1590 | BINASCII_B2A_UU_METHODDEF |
1591 | BINASCII_A2B_BASE64_METHODDEF |
1592 | BINASCII_B2A_BASE64_METHODDEF |
1593 | BINASCII_A2B_HQX_METHODDEF |
1594 | BINASCII_B2A_HQX_METHODDEF |
1595 | BINASCII_A2B_HEX_METHODDEF |
1596 | BINASCII_B2A_HEX_METHODDEF |
1597 | BINASCII_HEXLIFY_METHODDEF |
1598 | BINASCII_UNHEXLIFY_METHODDEF |
1599 | BINASCII_RLECODE_HQX_METHODDEF |
1600 | BINASCII_RLEDECODE_HQX_METHODDEF |
1601 | BINASCII_CRC_HQX_METHODDEF |
1602 | BINASCII_CRC32_METHODDEF |
1603 | BINASCII_A2B_QP_METHODDEF |
1604 | BINASCII_B2A_QP_METHODDEF |
1605 | {NULL, NULL} /* sentinel */ |
1606 | }; |
1607 | |
1608 | |
1609 | /* Initialization function for the module (*must* be called PyInit_binascii) */ |
1610 | PyDoc_STRVAR(doc_binascii, "Conversion between binary data and ASCII" ); |
1611 | |
1612 | static int |
1613 | binascii_exec(PyObject *module) { |
1614 | int result; |
1615 | binascii_state *state = PyModule_GetState(module); |
1616 | if (state == NULL) { |
1617 | return -1; |
1618 | } |
1619 | |
1620 | state->Error = PyErr_NewException("binascii.Error" , PyExc_ValueError, NULL); |
1621 | if (state->Error == NULL) { |
1622 | return -1; |
1623 | } |
1624 | Py_INCREF(state->Error); |
1625 | result = PyModule_AddObject(module, "Error" , state->Error); |
1626 | if (result == -1) { |
1627 | Py_DECREF(state->Error); |
1628 | return -1; |
1629 | } |
1630 | |
1631 | state->Incomplete = PyErr_NewException("binascii.Incomplete" , NULL, NULL); |
1632 | if (state->Incomplete == NULL) { |
1633 | return -1; |
1634 | } |
1635 | Py_INCREF(state->Incomplete); |
1636 | result = PyModule_AddObject(module, "Incomplete" , state->Incomplete); |
1637 | if (result == -1) { |
1638 | Py_DECREF(state->Incomplete); |
1639 | return -1; |
1640 | } |
1641 | |
1642 | return 0; |
1643 | } |
1644 | |
1645 | static PyModuleDef_Slot binascii_slots[] = { |
1646 | {Py_mod_exec, binascii_exec}, |
1647 | {0, NULL} |
1648 | }; |
1649 | |
1650 | static int |
1651 | binascii_traverse(PyObject *module, visitproc visit, void *arg) |
1652 | { |
1653 | binascii_state *state = get_binascii_state(module); |
1654 | Py_VISIT(state->Error); |
1655 | Py_VISIT(state->Incomplete); |
1656 | return 0; |
1657 | } |
1658 | |
1659 | static int |
1660 | binascii_clear(PyObject *module) |
1661 | { |
1662 | binascii_state *state = get_binascii_state(module); |
1663 | Py_CLEAR(state->Error); |
1664 | Py_CLEAR(state->Incomplete); |
1665 | return 0; |
1666 | } |
1667 | |
1668 | static void |
1669 | binascii_free(void *module) |
1670 | { |
1671 | binascii_clear((PyObject *)module); |
1672 | } |
1673 | |
1674 | static struct PyModuleDef binasciimodule = { |
1675 | PyModuleDef_HEAD_INIT, |
1676 | "binascii" , |
1677 | doc_binascii, |
1678 | sizeof(binascii_state), |
1679 | binascii_module_methods, |
1680 | binascii_slots, |
1681 | binascii_traverse, |
1682 | binascii_clear, |
1683 | binascii_free |
1684 | }; |
1685 | |
1686 | PyMODINIT_FUNC |
1687 | PyInit_binascii(void) |
1688 | { |
1689 | return PyModuleDef_Init(&binasciimodule); |
1690 | } |
1691 | |