/*** Routines to represent binary data in ASCII and vice-versa**** This module currently supports the following encodings:** uuencode:** each line encodes 45 bytes (except possibly the last)** First char encodes (binary) length, rest data** each char encodes 6 bits, as follows:** binary: 01234567 abcdefgh ijklmnop** ascii: 012345 67abcd efghij klmnop** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc.** short binary data is zero-extended (so the bits are always in the** right place), this does *not* reflect in the length.** base64:** Line breaks are insignificant, but lines are at most 76 chars** each char encodes 6 bits, in similar order as uucode/hqx. Encoding** is done via a table.** Short binary data is filled (in ASCII) with '='.** hqx:** File starts with introductory text, real data starts and ends** with colons.** Data consists of three similar parts: info, datafork, resourcefork.** Each part is protected (at the end) with a 16-bit crc** The binary data is run-length encoded, and then ascii-fied:** binary: 01234567 abcdefgh ijklmnop** ascii: 012345 67abcd efghij klmnop** ASCII encoding is table-driven, see the code.** Short binary data results in the runt ascii-byte being output with** the bits in the right place.**** While I was reading dozens of programs that encode or decode the formats** here (documentation? hihi:-) I have formulated Jansen's Observation:**** Programs that encode binary data in ASCII are written in** such a style that they are as unreadable as possible. Devices used** include unnecessary global variables, burying important tables** in unrelated sourcefiles, putting functions in include files,** using seemingly-descriptive variable names for different purposes,** calls to empty subroutines and a host of others.**** I have attempted to break with this tradition, but I guess that that** does make the performance sub-optimal. Oh well, too bad...**** Jack Jansen, CWI, July 1995.**** Added support for quoted-printable encoding, based on rfc 1521 et al** quoted-printable encoding specifies that non printable characters (anything** below 32 and above 126) be encoded as =XX where XX is the hexadecimal value** of the character. It also specifies some other behavior to enable 8bit data** in a mail message with little difficulty (maximum line sizes, protecting** some cases of whitespace, etc).**** Brandon Long, September 2001.*/ #define PY_SSIZE_T_CLEAN #include "Python.h" static PyObject *Error;static PyObject *Incomplete; /*** hqx lookup table, ascii->binary.*/ #define RUNCHAR 0x90 #define DONE 0x7F#define SKIP 0x7E#define FAIL 0x7D static unsigned char table_a2b_hqx[256] = {/* ^@ ^A ^B ^C ^D ^E ^F ^G *//* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,/* \b \t \n ^K ^L \r ^N ^O *//* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL,/* ^P ^Q ^R ^S ^T ^U ^V ^W *//* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ *//* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,/* ! " # $ % & ' *//* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,/* ( ) * + , - . / *//* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL,/* 0 1 2 3 4 5 6 7 *//* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL,/* 8 9 : ; < = > ? *//* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL,/* @ A B C D E F G *//* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D,/* H I J K L M N O *//* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL,/* P Q R S T U V W *//*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL,/* X Y Z [ \ ] ^ _ *//*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL,/* ` a b c d e f g *//*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL,/* h i j k l m n o *//*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL,/* p q r s t u v w *//*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL,/* x y z { | } ~ ^? *//*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,/*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,}; static unsigned char table_b2a_hqx[] ="!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr"; static char table_a2b_base64[] = { -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, /* Note PAD->0 */ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1}; #define BASE64_PAD '=' /* Max binary chunk size; limited only by available memory */#define BASE64_MAXBIN (INT_MAX/2 - sizeof(PyStringObject) - 3) static unsigned char table_b2a_base64[] ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; static unsigned short crctab_hqx[256] = { 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,}; PyDoc_STRVAR(doc_a2b_uu, "(ascii) -> bin. Decode a line of uuencoded data"); static PyObject *binascii_a2b_uu(PyObject *self, PyObject *args){ unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t ascii_len, bin_len; if ( !PyArg_ParseTuple(args, "t#:a2b_uu", &ascii_data, &ascii_len) ) return NULL; /* First byte: binary data length (in bytes) */ bin_len = (*ascii_data++ - ' ') & 077; ascii_len--; /* Allocate the buffer */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) return NULL; bin_data = (unsigned char *)PyString_AsString(rv); for( ; bin_len > 0 ; ascii_len--, ascii_data++ ) { /* XXX is it really best to add NULs if there's no more data */ this_ch = (ascii_len > 0) ? *ascii_data : 0; if ( this_ch == '\n' || this_ch == '\r' || ascii_len <= 0) { /* ** Whitespace. Assume some spaces got eaten at ** end-of-line. (We check this later) */ this_ch = 0; } else { /* Check the character for legality ** The 64 in stead of the expected 63 is because ** there are a few uuencodes out there that use ** '`' as zero instead of space. */ if ( this_ch < ' ' || this_ch > (' ' + 64)) { PyErr_SetString(Error, "Illegal char"); Py_DECREF(rv); return NULL; } this_ch = (this_ch - ' ') & 077; } /* ** Shift it in on the low end, and see if there's ** a byte ready for output. */ leftchar = (leftchar << 6) | (this_ch); leftbits += 6; if ( leftbits >= 8 ) { leftbits -= 8; *bin_data++ = (leftchar >> leftbits) & 0xff; leftchar &= ((1 << leftbits) - 1); bin_len--; } } /* ** Finally, check that if there's anything left on the line ** that it's whitespace only. */ while( ascii_len-- > 0 ) { this_ch = *ascii_data++; /* Extra '`' may be written as padding in some cases */ if ( this_ch != ' ' && this_ch != ' '+64 && this_ch != '\n' && this_ch != '\r' ) { PyErr_SetString(Error, "Trailing garbage"); Py_DECREF(rv); return NULL; } } return rv;} PyDoc_STRVAR(doc_b2a_uu, "(bin) -> ascii. Uuencode line of data"); static PyObject *binascii_b2a_uu(PyObject *self, PyObject *args){ unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t bin_len; if ( !PyArg_ParseTuple(args, "s#:b2a_uu", &bin_data, &bin_len) ) return NULL; if ( bin_len > 45 ) { /* The 45 is a limit that appears in all uuencode's */ PyErr_SetString(Error, "At most 45 bytes at once"); return NULL; } /* We're lazy and allocate to much (fixed up later) */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2+2)) == NULL ) return NULL; ascii_data = (unsigned char *)PyString_AsString(rv); /* Store the length */ *ascii_data++ = ' ' + (bin_len & 077); for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) { /* Shift the data (or padding) into our buffer */ if ( bin_len > 0 ) /* Data */ leftchar = (leftchar << 8) | *bin_data; else /* Padding */ leftchar <<= 8; leftbits += 8; /* See if there are 6-bit groups ready */ while ( leftbits >= 6 ) { this_ch = (leftchar >> (leftbits-6)) & 0x3f; leftbits -= 6; *ascii_data++ = this_ch + ' '; } } *ascii_data++ = '\n'; /* Append a courtesy newline */ _PyString_Resize(&rv, (ascii_data - (unsigned char *)PyString_AsString(rv))); return rv;} static intbinascii_find_valid(unsigned char *s, Py_ssize_t slen, int num){ /* Finds & returns the (num+1)th ** valid character for base64, or -1 if none. */ int ret = -1; unsigned char c, b64val; while ((slen > 0) && (ret == -1)) { c = *s; b64val = table_a2b_base64[c & 0x7f]; if ( ((c <= 0x7f) && (b64val != (unsigned char)-1)) ) { if (num == 0) ret = *s; num--; } s++; slen--; } return ret;} PyDoc_STRVAR(doc_a2b_base64, "(ascii) -> bin. Decode a line of base64 data"); static PyObject *binascii_a2b_base64(PyObject *self, PyObject *args){ unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t ascii_len, bin_len; int quad_pos = 0; if ( !PyArg_ParseTuple(args, "t#:a2b_base64", &ascii_data, &ascii_len) ) return NULL; bin_len = ((ascii_len+3)/4)*3; /* Upper bound, corrected later */ /* Allocate the buffer */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) return NULL; bin_data = (unsigned char *)PyString_AsString(rv); bin_len = 0; for( ; ascii_len > 0; ascii_len--, ascii_data++) { this_ch = *ascii_data; if (this_ch > 0x7f || this_ch == '\r' || this_ch == '\n' || this_ch == ' ') continue; /* Check for pad sequences and ignore ** the invalid ones. */ if (this_ch == BASE64_PAD) { if ( (quad_pos < 2) || ((quad_pos == 2) && (binascii_find_valid(ascii_data, ascii_len, 1) != BASE64_PAD)) ) { continue; } else { /* A pad sequence means no more input. ** We've already interpreted the data ** from the quad at this point. */ leftbits = 0; break; } } this_ch = table_a2b_base64[*ascii_data]; if ( this_ch == (unsigned char) -1 ) continue; /* ** Shift it in on the low end, and see if there's ** a byte ready for output. */ quad_pos = (quad_pos + 1) & 0x03; leftchar = (leftchar << 6) | (this_ch); leftbits += 6; if ( leftbits >= 8 ) { leftbits -= 8; *bin_data++ = (leftchar >> leftbits) & 0xff; bin_len++; leftchar &= ((1 << leftbits) - 1); } } if (leftbits != 0) { PyErr_SetString(Error, "Incorrect padding"); Py_DECREF(rv); return NULL; } /* And set string size correctly. If the result string is empty ** (because the input was all invalid) return the shared empty ** string instead; _PyString_Resize() won't do this for us. */ if (bin_len > 0) _PyString_Resize(&rv, bin_len); else { Py_DECREF(rv); rv = PyString_FromString(""); } return rv;} PyDoc_STRVAR(doc_b2a_base64, "(bin) -> ascii. Base64-code line of data"); static PyObject *binascii_b2a_base64(PyObject *self, PyObject *args){ unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t bin_len; if ( !PyArg_ParseTuple(args, "s#:b2a_base64", &bin_data, &bin_len) ) return NULL; if ( bin_len > BASE64_MAXBIN ) { PyErr_SetString(Error, "Too much data for base64 line"); return NULL; } /* We're lazy and allocate too much (fixed up later). "+3" leaves room for up to two pad characters and a trailing newline. Note that 'b' gets encoded as 'Yg==\n' (1 in, 5 out). */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2 + 3)) == NULL ) return NULL; ascii_data = (unsigned char *)PyString_AsString(rv); for( ; bin_len > 0 ; bin_len--, bin_data++ ) { /* Shift the data into our buffer */ leftchar = (leftchar << 8) | *bin_data; leftbits += 8; /* See if there are 6-bit groups ready */ while ( leftbits >= 6 ) { this_ch = (leftchar >> (leftbits-6)) & 0x3f; leftbits -= 6; *ascii_data++ = table_b2a_base64[this_ch]; } } if ( leftbits == 2 ) { *ascii_data++ = table_b2a_base64[(leftchar&3) << 4]; *ascii_data++ = BASE64_PAD; *ascii_data++ = BASE64_PAD; } else if ( leftbits == 4 ) { *ascii_data++ = table_b2a_base64[(leftchar&0xf) << 2]; *ascii_data++ = BASE64_PAD; } *ascii_data++ = '\n'; /* Append a courtesy newline */ _PyString_Resize(&rv, (ascii_data - (unsigned char *)PyString_AsString(rv))); return rv;} PyDoc_STRVAR(doc_a2b_hqx, "ascii -> bin, done. Decode .hqx coding"); static PyObject *binascii_a2b_hqx(PyObject *self, PyObject *args){ unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t len; int done = 0; if ( !PyArg_ParseTuple(args, "t#:a2b_hqx", &ascii_data, &len) ) return NULL; /* Allocate a string that is too big (fixed later) Add two to the initial length to prevent interning which would preclude subsequent resizing. */ if ( (rv=PyString_FromStringAndSize(NULL, len+2)) == NULL ) return NULL; bin_data = (unsigned char *)PyString_AsString(rv);Lines 1–500 of 1350. Load more
/* ** Routines to represent binary data in ASCII and vice-versa ** ** This module currently supports the following encodings: ** uuencode: ** each line encodes 45 bytes (except possibly the last) ** First char encodes (binary) length, rest data ** each char encodes 6 bits, as follows: ** binary: 01234567 abcdefgh ijklmnop ** ascii: 012345 67abcd efghij klmnop ** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc. ** short binary data is zero-extended (so the bits are always in the ** right place), this does *not* reflect in the length. ** base64: ** Line breaks are insignificant, but lines are at most 76 chars ** each char encodes 6 bits, in similar order as uucode/hqx. Encoding ** is done via a table. ** Short binary data is filled (in ASCII) with '='. ** hqx: ** File starts with introductory text, real data starts and ends ** with colons. ** Data consists of three similar parts: info, datafork, resourcefork. ** Each part is protected (at the end) with a 16-bit crc ** The binary data is run-length encoded, and then ascii-fied: ** binary: 01234567 abcdefgh ijklmnop ** ascii: 012345 67abcd efghij klmnop ** ASCII encoding is table-driven, see the code. ** Short binary data results in the runt ascii-byte being output with ** the bits in the right place. ** ** While I was reading dozens of programs that encode or decode the formats ** here (documentation? hihi:-) I have formulated Jansen's Observation: ** ** Programs that encode binary data in ASCII are written in ** such a style that they are as unreadable as possible. Devices used ** include unnecessary global variables, burying important tables ** in unrelated sourcefiles, putting functions in include files, ** using seemingly-descriptive variable names for different purposes, ** calls to empty subroutines and a host of others. ** ** I have attempted to break with this tradition, but I guess that that ** does make the performance sub-optimal. Oh well, too bad... ** ** Jack Jansen, CWI, July 1995. ** ** Added support for quoted-printable encoding, based on rfc 1521 et al ** quoted-printable encoding specifies that non printable characters (anything ** below 32 and above 126) be encoded as =XX where XX is the hexadecimal value ** of the character. It also specifies some other behavior to enable 8bit data ** in a mail message with little difficulty (maximum line sizes, protecting ** some cases of whitespace, etc). ** ** Brandon Long, September 2001. */ #define PY_SSIZE_T_CLEAN #include "Python.h" static PyObject *Error; static PyObject *Incomplete; /* ** hqx lookup table, ascii->binary. */ #define RUNCHAR 0x90 #define DONE 0x7F #define SKIP 0x7E #define FAIL 0x7D static unsigned char table_a2b_hqx[256] = { /* ^@ ^A ^B ^C ^D ^E ^F ^G */ /* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, /* \b \t \n ^K ^L \r ^N ^O */ /* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL, /* ^P ^Q ^R ^S ^T ^U ^V ^W */ /* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, /* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */ /* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, /* ! " # $ % & ' */ /* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /* ( ) * + , - . / */ /* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL, /* 0 1 2 3 4 5 6 7 */ /* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL, /* 8 9 : ; < = > ? */ /* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL, /* @ A B C D E F G */ /* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, /* H I J K L M N O */ /* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL, /* P Q R S T U V W */ /*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL, /* X Y Z [ \ ] ^ _ */ /*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL, /* ` a b c d e f g */ /*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL, /* h i j k l m n o */ /*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL, /* p q r s t u v w */ /*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL, /* x y z { | } ~ ^? */ /*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, /*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, }; static unsigned char table_b2a_hqx[] = "!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr"; static char table_a2b_base64[] = { -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, /* Note PAD->0 */ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 }; #define BASE64_PAD '=' /* Max binary chunk size; limited only by available memory */ #define BASE64_MAXBIN (INT_MAX/2 - sizeof(PyStringObject) - 3) static unsigned char table_b2a_base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; static unsigned short crctab_hqx[256] = { 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, }; PyDoc_STRVAR(doc_a2b_uu, "(ascii) -> bin. Decode a line of uuencoded data"); static PyObject * binascii_a2b_uu(PyObject *self, PyObject *args) { unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t ascii_len, bin_len; if ( !PyArg_ParseTuple(args, "t#:a2b_uu", &ascii_data, &ascii_len) ) return NULL; /* First byte: binary data length (in bytes) */ bin_len = (*ascii_data++ - ' ') & 077; ascii_len--; /* Allocate the buffer */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) return NULL; bin_data = (unsigned char *)PyString_AsString(rv); for( ; bin_len > 0 ; ascii_len--, ascii_data++ ) { /* XXX is it really best to add NULs if there's no more data */ this_ch = (ascii_len > 0) ? *ascii_data : 0; if ( this_ch == '\n' || this_ch == '\r' || ascii_len <= 0) { /* ** Whitespace. Assume some spaces got eaten at ** end-of-line. (We check this later) */ this_ch = 0; } else { /* Check the character for legality ** The 64 in stead of the expected 63 is because ** there are a few uuencodes out there that use ** '`' as zero instead of space. */ if ( this_ch < ' ' || this_ch > (' ' + 64)) { PyErr_SetString(Error, "Illegal char"); Py_DECREF(rv); return NULL; } this_ch = (this_ch - ' ') & 077; } /* ** Shift it in on the low end, and see if there's ** a byte ready for output. */ leftchar = (leftchar << 6) | (this_ch); leftbits += 6; if ( leftbits >= 8 ) { leftbits -= 8; *bin_data++ = (leftchar >> leftbits) & 0xff; leftchar &= ((1 << leftbits) - 1); bin_len--; } } /* ** Finally, check that if there's anything left on the line ** that it's whitespace only. */ while( ascii_len-- > 0 ) { this_ch = *ascii_data++; /* Extra '`' may be written as padding in some cases */ if ( this_ch != ' ' && this_ch != ' '+64 && this_ch != '\n' && this_ch != '\r' ) { PyErr_SetString(Error, "Trailing garbage"); Py_DECREF(rv); return NULL; } } return rv; } PyDoc_STRVAR(doc_b2a_uu, "(bin) -> ascii. Uuencode line of data"); static PyObject * binascii_b2a_uu(PyObject *self, PyObject *args) { unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t bin_len; if ( !PyArg_ParseTuple(args, "s#:b2a_uu", &bin_data, &bin_len) ) return NULL; if ( bin_len > 45 ) { /* The 45 is a limit that appears in all uuencode's */ PyErr_SetString(Error, "At most 45 bytes at once"); return NULL; } /* We're lazy and allocate to much (fixed up later) */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2+2)) == NULL ) return NULL; ascii_data = (unsigned char *)PyString_AsString(rv); /* Store the length */ *ascii_data++ = ' ' + (bin_len & 077); for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) { /* Shift the data (or padding) into our buffer */ if ( bin_len > 0 ) /* Data */ leftchar = (leftchar << 8) | *bin_data; else /* Padding */ leftchar <<= 8; leftbits += 8; /* See if there are 6-bit groups ready */ while ( leftbits >= 6 ) { this_ch = (leftchar >> (leftbits-6)) & 0x3f; leftbits -= 6; *ascii_data++ = this_ch + ' '; } } *ascii_data++ = '\n'; /* Append a courtesy newline */ _PyString_Resize(&rv, (ascii_data - (unsigned char *)PyString_AsString(rv))); return rv; } static int binascii_find_valid(unsigned char *s, Py_ssize_t slen, int num) { /* Finds & returns the (num+1)th ** valid character for base64, or -1 if none. */ int ret = -1; unsigned char c, b64val; while ((slen > 0) && (ret == -1)) { c = *s; b64val = table_a2b_base64[c & 0x7f]; if ( ((c <= 0x7f) && (b64val != (unsigned char)-1)) ) { if (num == 0) ret = *s; num--; } s++; slen--; } return ret; } PyDoc_STRVAR(doc_a2b_base64, "(ascii) -> bin. Decode a line of base64 data"); static PyObject * binascii_a2b_base64(PyObject *self, PyObject *args) { unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t ascii_len, bin_len; int quad_pos = 0; if ( !PyArg_ParseTuple(args, "t#:a2b_base64", &ascii_data, &ascii_len) ) return NULL; bin_len = ((ascii_len+3)/4)*3; /* Upper bound, corrected later */ /* Allocate the buffer */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) return NULL; bin_data = (unsigned char *)PyString_AsString(rv); bin_len = 0; for( ; ascii_len > 0; ascii_len--, ascii_data++) { this_ch = *ascii_data; if (this_ch > 0x7f || this_ch == '\r' || this_ch == '\n' || this_ch == ' ') continue; /* Check for pad sequences and ignore ** the invalid ones. */ if (this_ch == BASE64_PAD) { if ( (quad_pos < 2) || ((quad_pos == 2) && (binascii_find_valid(ascii_data, ascii_len, 1) != BASE64_PAD)) ) { continue; } else { /* A pad sequence means no more input. ** We've already interpreted the data ** from the quad at this point. */ leftbits = 0; break; } } this_ch = table_a2b_base64[*ascii_data]; if ( this_ch == (unsigned char) -1 ) continue; /* ** Shift it in on the low end, and see if there's ** a byte ready for output. */ quad_pos = (quad_pos + 1) & 0x03; leftchar = (leftchar << 6) | (this_ch); leftbits += 6; if ( leftbits >= 8 ) { leftbits -= 8; *bin_data++ = (leftchar >> leftbits) & 0xff; bin_len++; leftchar &= ((1 << leftbits) - 1); } } if (leftbits != 0) { PyErr_SetString(Error, "Incorrect padding"); Py_DECREF(rv); return NULL; } /* And set string size correctly. If the result string is empty ** (because the input was all invalid) return the shared empty ** string instead; _PyString_Resize() won't do this for us. */ if (bin_len > 0) _PyString_Resize(&rv, bin_len); else { Py_DECREF(rv); rv = PyString_FromString(""); } return rv; } PyDoc_STRVAR(doc_b2a_base64, "(bin) -> ascii. Base64-code line of data"); static PyObject * binascii_b2a_base64(PyObject *self, PyObject *args) { unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t bin_len; if ( !PyArg_ParseTuple(args, "s#:b2a_base64", &bin_data, &bin_len) ) return NULL; if ( bin_len > BASE64_MAXBIN ) { PyErr_SetString(Error, "Too much data for base64 line"); return NULL; } /* We're lazy and allocate too much (fixed up later). "+3" leaves room for up to two pad characters and a trailing newline. Note that 'b' gets encoded as 'Yg==\n' (1 in, 5 out). */ if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2 + 3)) == NULL ) return NULL; ascii_data = (unsigned char *)PyString_AsString(rv); for( ; bin_len > 0 ; bin_len--, bin_data++ ) { /* Shift the data into our buffer */ leftchar = (leftchar << 8) | *bin_data; leftbits += 8; /* See if there are 6-bit groups ready */ while ( leftbits >= 6 ) { this_ch = (leftchar >> (leftbits-6)) & 0x3f; leftbits -= 6; *ascii_data++ = table_b2a_base64[this_ch]; } } if ( leftbits == 2 ) { *ascii_data++ = table_b2a_base64[(leftchar&3) << 4]; *ascii_data++ = BASE64_PAD; *ascii_data++ = BASE64_PAD; } else if ( leftbits == 4 ) { *ascii_data++ = table_b2a_base64[(leftchar&0xf) << 2]; *ascii_data++ = BASE64_PAD; } *ascii_data++ = '\n'; /* Append a courtesy newline */ _PyString_Resize(&rv, (ascii_data - (unsigned char *)PyString_AsString(rv))); return rv; } PyDoc_STRVAR(doc_a2b_hqx, "ascii -> bin, done. Decode .hqx coding"); static PyObject * binascii_a2b_hqx(PyObject *self, PyObject *args) { unsigned char *ascii_data, *bin_data; int leftbits = 0; unsigned char this_ch; unsigned int leftchar = 0; PyObject *rv; Py_ssize_t len; int done = 0; if ( !PyArg_ParseTuple(args, "t#:a2b_hqx", &ascii_data, &len) ) return NULL; /* Allocate a string that is too big (fixed later) Add two to the initial length to prevent interning which would preclude subsequent resizing. */ if ( (rv=PyString_FromStringAndSize(NULL, len+2)) == NULL ) return NULL; bin_data = (unsigned char *)PyString_AsString(rv);