pike.git/src/modules/MIME/mime.c:2ca858eda6f885ae15bc5e91692818185a7da2c7

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For copyright information see COPYRIGHT. || Pike is distributed under GPL, LGPL and MPL. See the file COPYING || for more information. */ /* * @rfc{1521@} functionality for Pike * * Marcus Comstedt 1996-1999 */ #include "global.h" #include "config.h" #include "module.h" #include "stralloc.h" #include "pike_macros.h" #include "object.h" #include "program.h" #include "interpret.h" #include "builtin_functions.h" #include "module_support.h" #include "pike_error.h" #ifdef __CHAR_UNSIGNED__ #define SIGNED signed #else #define SIGNED #endif #define sp Pike_sp /** Forward declarations of functions implementing Pike functions **/ static void f_decode_base64( INT32 args ); static void f_encode_base64( INT32 args ); static void f_decode_qp( INT32 args ); static void f_encode_qp( INT32 args ); static void f_decode_uue( INT32 args ); static void f_encode_uue( INT32 args ); static void f_tokenize( INT32 args ); static void f_tokenize_labled( INT32 args ); static void f_quote( INT32 args ); static void f_quote_labled( INT32 args ); /** Global tables **/ static const char base64tab[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; static SIGNED char base64rtab[(1<<(CHAR_BIT-1))-' ']; static const char qptab[16] = "0123456789ABCDEF"; static SIGNED char qprtab[(1<<(CHAR_BIT-1))-'0']; #define CT_CTL 0 #define CT_WHITE 1 #define CT_ATOM 2 #define CT_SPECIAL 3 #define CT_EQUAL 4 #define CT_LPAR 5 #define CT_RPAR 6 #define CT_LBRACK 7 #define CT_RBRACK 8 #define CT_QUOTE 9 unsigned char rfc822ctype[1<<CHAR_BIT]; /*! @decl constant TOKENIZE_KEEP_ESCAPES *! *! Don't unquote backslash-sequences in quoted strings during tokenizing. *! This is used for bug-compatibility with Microsoft... *! *! @seealso *! @[tokenize()], @[tokenize_labled()] */ #define TOKENIZE_KEEP_ESCAPES 1 /** Externally available functions **/ /*! @module MIME */ /* Initialize and start module */ PIKE_MODULE_INIT { int i; Pike_compiler->new_program->id = PROG_MODULE_MIME_ID; /* Init reverse base64 mapping */ memset( base64rtab, -1, sizeof(base64rtab) ); for (i = 0; i < 64; i++) base64rtab[base64tab[i] - ' '] = i; /* Init reverse qp mapping */ memset( qprtab, -1, sizeof(qprtab) ); for (i = 0; i < 16; i++) qprtab[qptab[i]-'0'] = i; for (i = 10; i < 16; i++) /* Lower case hex digits */ qprtab[qptab[i] - ('0' + 'A' - 'a')] = i; /* Init lexical properties of characters for MIME.tokenize() */ memset( rfc822ctype, CT_ATOM, sizeof(rfc822ctype) ); for (i = 0; i < 32; i++) rfc822ctype[i] = CT_CTL; rfc822ctype[127] = CT_CTL; rfc822ctype[' '] = CT_WHITE; rfc822ctype['\t'] = CT_WHITE; rfc822ctype['('] = CT_LPAR; rfc822ctype[')'] = CT_RPAR; rfc822ctype['['] = CT_LBRACK; rfc822ctype[']'] = CT_RBRACK; rfc822ctype['"'] = CT_QUOTE; rfc822ctype['='] = CT_EQUAL; for(i=0; i<9; i++) rfc822ctype[(int)"<>@,;:\\/?"[i]] = CT_SPECIAL; /* Add global functions */ /* Really tFunc(tStr7, tStr8), but cut down on warnings for now. */ ADD_FUNCTION2( "decode_base64", f_decode_base64, tFunc(tStr, tStr8), 0, OPT_TRY_OPTIMIZE ); ADD_FUNCTION2( "encode_base64", f_encode_base64, tFunc(tStr tOr(tVoid,tInt),tStr7), 0, OPT_TRY_OPTIMIZE ); add_function_constant( "decode_qp", f_decode_qp, "function(string:string)", OPT_TRY_OPTIMIZE ); ADD_FUNCTION2( "encode_qp", f_encode_qp, tFunc(tStr tOr(tVoid,tInt),tStr7), 0, OPT_TRY_OPTIMIZE ); add_function_constant( "decode_uue", f_decode_uue, "function(string:string)", OPT_TRY_OPTIMIZE ); ADD_FUNCTION2( "encode_uue", f_encode_uue, tFunc(tStr tOr(tVoid,tStr),tStr7), 0, OPT_TRY_OPTIMIZE ); add_integer_constant("TOKENIZE_KEEP_ESCAPES", TOKENIZE_KEEP_ESCAPES, 0); add_function_constant( "tokenize", f_tokenize, "function(string, int|void:array(string|int))", OPT_TRY_OPTIMIZE ); add_function_constant( "tokenize_labled", f_tokenize_labled, "function(string, int|void:array(array(string|int)))", OPT_TRY_OPTIMIZE ); add_function_constant( "quote", f_quote, "function(array(string|int):string)", OPT_TRY_OPTIMIZE ); add_function_constant( "quote_labled", f_quote_labled, "function(array(array(string|int)):string)", OPT_TRY_OPTIMIZE ); } /* Restore and exit module */ PIKE_MODULE_EXIT { } /** Functions implementing Pike functions **/ /*! @decl string decode_base64(string encoded_data) *! *! This function decodes data encoded using the @tt{base64@} *! transfer encoding. *! *! @seealso *! @[MIME.encode_base64()], @[MIME.decode()] */ static void f_decode_base64( INT32 args ) { if(args != 1) Pike_error( "Wrong number of arguments to MIME.decode_base64()\n" ); else if (TYPEOF(sp[-1]) != T_STRING) Pike_error( "Wrong type of argument to MIME.decode_base64()\n" ); else if (sp[-1].u.string->size_shift != 0) Pike_error( "Char out of range for MIME.decode_base64()\n" ); else { /* Decode the string in sp[-1].u.string. Any whitespace etc must be ignored, so the size of the result can't be exactly calculated from the input size. We'll use a string builder instead. */ struct string_builder buf; SIGNED char *src; ptrdiff_t cnt; INT32 d = 1; int pads = 3; init_string_builder( &buf, 0 ); for (src = (SIGNED char *)sp[-1].u.string->str, cnt = sp[-1].u.string->len; cnt--; src++) if(*src>=' ' && base64rtab[*src-' ']>=0) { /* 6 more bits to put into d */ if((d=(d<<6)|base64rtab[*src-' '])>=0x1000000) { /* d now contains 24 valid bits. Put them in the buffer */ string_builder_putchar( &buf, (d>>16)&0xff ); string_builder_putchar( &buf, (d>>8)&0xff ); string_builder_putchar( &buf, d&0xff ); d=1; } } else if (*src=='=') { /* A pad character has been encountered. */ break; } /* If data size not an even multiple of 3 bytes, output remaining data */ if (d & 0x3f000000) { /* NOT_REACHED, but here for symmetry. */ pads = 0; } else if (d & 0xfc0000) { pads = 1; /* Remove unused bits from d. */ d >>= 2; } else if (d & 0x3f000) { pads = 2; /* Remove unused bits from d. */ d >>= 4; } switch(pads) { case 0: /* NOT_REACHED, but here for symmetry. */ string_builder_putchar( &buf, (d>>16)&0xff ); case 1: string_builder_putchar( &buf, (d>>8)&0xff ); case 2: string_builder_putchar( &buf, d&0xff ); } /* Return result */ pop_n_elems( 1 ); push_string( finish_string_builder( &buf ) ); } } /* Convenience function for encode_base64(); Encode groups*3 bytes from * *srcp into groups*4 bytes at *destp. */ static int do_b64_encode( ptrdiff_t groups, unsigned char **srcp, char **destp, int insert_crlf ) { unsigned char *src = *srcp; char *dest = *destp; int g = 0; while (groups--) { /* Get 24 bits from src */ INT32 d = *src++<<8; d = (*src++|d)<<8; d |= *src++; /* Output in encoded from to dest */ *dest++ = base64tab[d>>18]; *dest++ = base64tab[(d>>12)&63]; *dest++ = base64tab[(d>>6)&63]; *dest++ = base64tab[d&63]; /* Insert a linebreak once in a while... */ if(insert_crlf && ++g == 19) { *dest++ = 13; *dest++ = 10; g=0; } } /* Update pointers */ *srcp = src; *destp = dest; return g; } /*! @decl string encode_base64(string data, void|int no_linebreaks) *! *! This function encodes data using the @tt{base64@} transfer encoding. *! *! If a nonzero value is passed as @[no_linebreaks], the result string *! will not contain any linebreaks. *! *! @seealso *! @[MIME.decode_base64()], @[MIME.encode()] */ static void f_encode_base64( INT32 args ) { if(args != 1 && args != 2) Pike_error( "Wrong number of arguments to MIME.encode_base64()\n" ); else if(TYPEOF(sp[-args]) != T_STRING) Pike_error( "Wrong type of argument to MIME.encode_base64()\n" ); else if (sp[-args].u.string->size_shift != 0) Pike_error( "Char out of range for MIME.encode_base64()\n" ); else { /* Encode the string in sp[-args].u.string. First, we need to know the number of 24 bit groups in the input, and the number of bytes actually present in the last group. */ ptrdiff_t groups = (sp[-args].u.string->len+2)/3; ptrdiff_t last = (sp[-args].u.string->len-1)%3+1; int insert_crlf = !(args == 2 && TYPEOF(sp[-1]) == T_INT && sp[-1].u.integer != 0); /* We need 4 bytes for each 24 bit group, and 2 bytes for each linebreak */ struct pike_string *str = begin_shared_string( groups*4+(insert_crlf? (groups/19)*2 : 0) ); unsigned char *src = (unsigned char *)sp[-args].u.string->str; char *dest = str->str; if (groups) { /* Temporary storage for the last group, as we may have to read an extra byte or two and don't want to get any page-faults. */ unsigned char tmp[3], *tmpp = tmp; int i; if (do_b64_encode( groups-1, &src, &dest, insert_crlf ) == 18) /* Skip the final linebreak if it's not to be followed by anything */ str->len -= 2; /* Copy the last group to temporary storage */ tmp[1] = tmp[2] = 0; for (i = 0; i < last; i++) tmp[i] = *src++; /* Encode the last group, and replace output codes with pads as needed */ do_b64_encode( 1, &tmpp, &dest, 0 ); switch (last) { case 1: *--dest = '='; case 2: *--dest = '='; } } /* Return the result */ pop_n_elems( args ); push_string( end_shared_string( str ) ); } } /*! @decl string decode_qp(string encoded_data) *! *! This function decodes data encoded using the @tt{quoted-printable@} *! (a.k.a. quoted-unreadable) transfer encoding. *! *! @seealso *! @[MIME.encode_qp()], @[MIME.decode()] */ static void f_decode_qp( INT32 args ) { if(args != 1) Pike_error( "Wrong number of arguments to MIME.decode_qp()\n" ); else if(TYPEOF(sp[-1]) != T_STRING) Pike_error( "Wrong type of argument to MIME.decode_qp()\n" ); else if (sp[-1].u.string->size_shift != 0) Pike_error( "Char out of range for MIME.decode_qp()\n" ); else { /* Decode the string in sp[-1].u.string. We have absolutely no idea how much of the input is raw data and how much is encoded data, so we'll use a string builder to hold the result. */ struct string_builder buf; SIGNED char *src; ptrdiff_t cnt; init_string_builder(&buf, 0); for (src = (SIGNED char *)sp[-1].u.string->str, cnt = sp[-1].u.string->len; cnt--; src++) if (*src == '=') { /* Encoded data */ if (cnt > 0 && (src[1] == 10 || src[1] == 13)) { /* A '=' followed by CR, LF or CRLF will be simply ignored. */ if (src[1] == 13) { --cnt; src++; } if (cnt>0 && src[1]==10) { --cnt; src++; } } else if (cnt >= 2 && src[1] >= '0' && src[2] >= '0' && qprtab[src[1]-'0'] >= 0 && qprtab[src[2]-'0'] >= 0) { /* A '=' followed by a hexadecimal number. */ string_builder_putchar( &buf, (qprtab[src[1]-'0']<<4)|qprtab[src[2]-'0'] ); cnt -= 2; src += 2; } } else /* Raw data */ string_builder_putchar( &buf, *(unsigned char *)src ); /* Return the result */ pop_n_elems( 1 ); push_string( finish_string_builder( &buf ) ); } } /*! @decl string encode_qp(string data, void|int no_linebreaks) *! *! This function encodes data using the @tt{quoted-printable@} *! (a.k.a. quoted-unreadable) transfer encoding. *! *! If a nonzero value is passed as @[no_linebreaks], the result *! string will not contain any linebreaks. *! *! @note *! Please do not use this function. QP is evil, and there's no *! excuse for using it. *! *! @seealso *! @[MIME.decode_qp()], @[MIME.encode()] */ static void f_encode_qp( INT32 args ) { if (args != 1 && args != 2) Pike_error( "Wrong number of arguments to MIME.encode_qp()\n" ); else if (TYPEOF(sp[-args]) != T_STRING) Pike_error( "Wrong type of argument to MIME.encode_qp()\n" ); else if (sp[-args].u.string->size_shift != 0) Pike_error( "Char out of range for MIME.encode_qp()\n" ); else { /* Encode the string in sp[-args].u.string. We don't know how much of the data has to be encoded, so let's use that trusty string builder once again. */ struct string_builder buf; unsigned char *src = (unsigned char *)sp[-args].u.string->str; ptrdiff_t cnt; int col = 0; int insert_crlf = !(args == 2 && TYPEOF(sp[-1]) == T_INT && sp[-1].u.integer != 0); init_string_builder( &buf, 0 ); for (cnt = sp[-args].u.string->len; cnt--; src++) { if ((*src >= 33 && *src <= 60) || (*src >= 62 && *src <= 126)) /* These characters can always be encoded as themselves */ string_builder_putchar( &buf, *(unsigned char *)src ); else { /* Better safe than sorry, eh? Use the dreaded hex escape */ string_builder_putchar( &buf, '=' ); string_builder_putchar( &buf, qptab[(*src)>>4] ); string_builder_putchar( &buf, qptab[(*src)&15] ); col += 2; } /* We'd better not let the lines get too long */ if (++col >= 73 && insert_crlf) { string_builder_putchar( &buf, '=' ); string_builder_putchar( &buf, 13 ); string_builder_putchar( &buf, 10 ); col = 0; } } /* Return the result */ pop_n_elems( args ); push_string( finish_string_builder( &buf ) ); } } /* MIME.decode_uue() */ /*! @decl string decode_uue(string encoded_data) *! *! This function decodes data encoded using the @tt{x-uue@} transfer encoding. *! It can also be used to decode generic UUEncoded files. *! *! @seealso *! @[MIME.encode_uue()], @[MIME.decode()] */ static void f_decode_uue( INT32 args ) { if (args != 1) Pike_error( "Wrong number of arguments to MIME.decode_uue()\n" ); else if(TYPEOF(sp[-1]) != T_STRING) Pike_error( "Wrong type of argument to MIME.decode_uue()\n" ); else if (sp[-1].u.string->size_shift != 0) Pike_error( "Char out of range for MIME.decode_uue()\n" ); else { /* Decode string in sp[-1].u.string. This is done much like in the base64 case, but we'll look for the "begin" line first. */ struct string_builder buf; char *src; ptrdiff_t cnt; init_string_builder( &buf, 0 ); src = sp[-1].u.string->str; cnt = sp[-1].u.string->len; while (cnt--) if(*src++=='b' && cnt>5 && !memcmp(src, "egin ", 5)) break; if (cnt>=0) /* We found a the string "begin". Now skip to EOL */ while (cnt--) if (*src++=='\n') break; if (cnt<0) { /* Could not find "begin.*\n", return 0 */ pop_n_elems( 1 ); push_int( 0 ); return; } for (;;) { int l, g; /* If we run out of input, or the line starts with "end", we are done */ if (cnt<=0 || *src=='e') break; /* Get the length byte, calculate the number of groups, and check that we have sufficient data */ l=(*src++-' ')&63; --cnt; g = (l+2)/3; l -= g*3; if ((cnt -= g*4) < 0) break; while (g--) { /* Read 24 bits of data */ INT32 d = ((*src++-' ')&63)<<18; d |= ((*src++-' ')&63)<<12; d |= ((*src++-' ')&63)<<6; d |= ((*src++-' ')&63); /* Output it into the buffer */ string_builder_putchar( &buf, (d>>16)&0xff ); string_builder_putchar( &buf, (d>>8)&0xff ); string_builder_putchar( &buf, d&0xff ); } /* If the line didn't contain an even multiple of 24 bits, remove spurious bytes from the buffer */ /* while (l++) string_builder_allocate( &buf, -1 ); */ /* Hmm... string_builder_allocate is static. Cheat a bit... */ if (l<0) buf.s->len += l; /* Skip to EOL */ while (cnt-- && *src++!=10); } /* Return the result */ pop_n_elems( 1 ); push_string( finish_string_builder( &buf ) ); } } /* Convenience function for encode_uue(); Encode groups*3 bytes from * *srcp into groups*4 bytes at *destp, and reserve space for last more. */ static void do_uue_encode(ptrdiff_t groups, unsigned char **srcp, char **destp, ptrdiff_t last ) { unsigned char *src = *srcp; char *dest = *destp; while (groups || last) { /* A single line can hold at most 15 groups */ ptrdiff_t g = (groups >= 15? 15 : groups); if (g<15) { /* The line isn't filled completely. Add space for the "last" bytes */ *dest++ = ' ' + DO_NOT_WARN((char)(3*g + last)); last = 0; } else *dest++ = ' ' + DO_NOT_WARN((char)(3*g)); groups -= g; while (g--) { /* Get 24 bits of data */ INT32 d = *src++<<8; d = (*src++|d)<<8; d |= *src++; /* Output it in encoded form */ if((*dest++ = ' '+(d>>18)) == ' ') dest[-1]='`'; if((*dest++ = ' '+((d>>12)&63)) == ' ') dest[-1]='`'; if((*dest++ = ' '+((d>>6)&63)) == ' ') dest[-1]='`'; if((*dest++ = ' '+(d&63)) == ' ') dest[-1]='`'; } if(groups || last) { /* There's more data to be written, so add a linebreak before looping */ *dest++ = 13; *dest++ = 10; } } /* Update pointers */ *srcp = src; *destp = dest; } /* MIME.encode_uue() */ /*! @decl string encode_uue(string encoded_data, void|string filename) *! *! This function encodes data using the @tt{x-uue@} transfer encoding. *! *! The optional argument @[filename] specifies an advisory filename to include *! in the encoded data, for extraction purposes. *! *! This function can also be used to produce generic UUEncoded files. *! *! @seealso *! @[MIME.decode_uue()], @[MIME.encode()] */ static void f_encode_uue( INT32 args ) { if (args != 1 && args != 2) Pike_error( "Wrong number of arguments to MIME.encode_uue()\n" ); else if (TYPEOF(sp[-args]) != T_STRING || (args == 2 && TYPEOF(sp[-1]) != T_VOID && TYPEOF(sp[-1]) != T_STRING && TYPEOF(sp[-1]) != T_INT)) Pike_error( "Wrong type of argument to MIME.encode_uue()\n" ); else if (sp[-args].u.string->size_shift != 0 || (args == 2 && TYPEOF(sp[-1]) == T_STRING && sp[-1].u.string->size_shift != 0)) Pike_error( "Char out of range for MIME.encode_uue()\n" ); else { /* Encode string in sp[-args].u.string. If args == 2, there may be a filename in sp[-1].u.string. If we don't get a filename, use the generic filename "attachment"... */ char *dest, *filename = "attachment"; struct pike_string *str; unsigned char *src = (unsigned char *) sp[-args].u.string->str; /* Calculate number of 24 bit groups, and actual # of bytes in last grp */ ptrdiff_t groups = (sp[-args].u.string->len + 2)/3; ptrdiff_t last= (sp[-args].u.string->len - 1)%3 + 1; /* Get the filename if provided */ if (args == 2 && TYPEOF(sp[-1]) == T_STRING) filename = sp[-1].u.string->str; /* Allocate the space we need. This included space for the actual data, linebreaks and the "begin" and "end" lines (including filename) */ str = begin_shared_string( groups*4 + ((groups + 14)/15)*3 + strlen( filename ) + 20 ); dest = str->str; /* Write the begin line containing the filename */ sprintf(dest, "begin 644 %s\r\n", filename); dest += 12 + strlen(filename); if (groups) { /* Temporary storage for the last group, as we may have to read an extra byte or two and don't want to get any page-faults. */ unsigned char tmp[3], *tmpp=tmp; char *kp, k; int i; do_uue_encode( groups-1, &src, &dest, last ); /* Copy the last group into temporary storage */ tmp[1] = tmp[2] = 0; for (i = 0; i < last; i++) tmp[i] = *src++; /* Remember the address and contents of the last character written. This will get overwritten by a fake length byte which we will then replace with the originial character */ k = *--dest; kp = dest; do_uue_encode( 1, &tmpp, &dest, 0 ); /* Restore the saved character */ *kp = k; /* Replace final nulls with pad characters if neccesary */ switch (last) { case 1: dest[-2] = '`'; case 2: dest[-1] = '`'; } /* Add a final linebreak after the last group */ *dest++ = 13; *dest++ = 10; } /* Put a terminating line (length byte `) and the "end" line into buffer */ memcpy( dest, "`\r\nend\r\n", 8 ); /* Return the result */ pop_n_elems( args ); push_string( end_shared_string( str ) ); } } static void low_tokenize( const char *funname, INT32 args, int mode ) { /* Tokenize string in sp[-args].u.string. We'll just push the tokens on the stack, and then do an aggregate_array just before exiting. */ unsigned char *src; int flags = 0; struct array *arr; struct pike_string *str; ptrdiff_t cnt; INT32 n = 0, l, e, d; char *p; get_all_args(funname, args, "%S.%d", &str, &flags); src = STR0(str); cnt = str->len; while (cnt>0) switch (rfc822ctype[*src]) { case CT_EQUAL: /* Might be an encoded word. Check it out. */ l = 0; if (cnt>5 && src[1] == '?') { int nq = 0; for (l=2; l<cnt && nq<3; l++) if (src[l]=='?') nq ++; else if(rfc822ctype[src[l]]<=CT_WHITE) break; if (nq == 3 && l<cnt && src[l] == '=') l ++; else l = 0; } if (l>0) { /* Yup. It's an encoded word, so it must be an atom. */ if(mode) push_text("encoded-word"); push_string( make_shared_binary_string( (char *)src, l ) ); if(mode) f_aggregate(2); n++; src += l; cnt -= l; break; } case CT_SPECIAL: case CT_RBRACK: case CT_RPAR: /* Individual special character, push as a char (= int) */ if(mode) push_text("special"); push_int( *src++ ); if(mode) f_aggregate(2); n++; --cnt; break; case CT_ATOM: /* Atom, find length then push as a string */ for (l=1; l<cnt; l++) if (rfc822ctype[src[l]] != CT_ATOM) break; if(mode) push_text("word"); push_string( make_shared_binary_string( (char *)src, l ) ); if(mode) f_aggregate(2); n++; src += l; cnt -= l; break; case CT_QUOTE: /* Quoted-string, find length then push as a string while removing escapes. */ for (e = 0, l = 1; l < cnt; l++) if (src[l] == '"') break; else if ((src[l] == '\\') && !(flags & TOKENIZE_KEEP_ESCAPES)) { e++; l++; } /* Push the resulting string */ if(mode) push_text("word"); if (e) { /* l is the distance to the ending ", and e is the number of \ escapes encountered on the way */ str = begin_shared_string( l-e-1 ); /* Copy the string and remove \ escapes */ for (p = str->str, e = 1; e < l; e++) *p++ = (src[e] == '\\'? src[++e] : src[e]); push_string( end_shared_string( str ) ); } else { /* No escapes. */ push_string(make_shared_binary_string( (char *)src+1, l-1)); } if(mode) f_aggregate(2); n++; src += l+1; cnt -= l+1; break; case CT_LBRACK: /* Domain literal. Handled just like quoted-string, except that ] marks the end of the token, not ". */ for (e = 0, l = 1; l < cnt; l++) if(src[l] == ']') break; else if(src[l] == '\\') { e++; l++; } if (l >= cnt) { /* No ]; seems that this was no domain literal after all... */ if(mode) push_text("special"); push_int( *src++ ); if(mode) f_aggregate(2); n++; --cnt; break; } /* l is the distance to the ending ], and e is the number of \ escapes encountered on the way */ str = begin_shared_string( l-e+1 ); /* Copy the literal and remove \ escapes */ for (p = str->str, e = 0; e <= l; e++) *p++ = (src[e] == '\\'? src[++e] : src[e]); /* Push the resulting string */ if(mode) push_text("domain-literal"); push_string( end_shared_string( str ) ); if(mode) f_aggregate(2); n++; src += l+1; cnt -= l+1; break; case CT_LPAR: /* Comment. Nested comments are allowed, so we'll use d to keep track of the nesting level. */ for (e = 0, d = 1, l = 1; l < cnt; l++) if (src[l] == '(') /* One level deeper nesting */ d++; else if(src[l] == ')') { /* End of comment level. If nesting reaches 0, we're done */ if(!--d) break; } else /* Skip escaped characters */ if(src[l] == '\\') { e++; l++; } if(mode) { push_text("comment"); str = begin_shared_string( l-e-1 ); /* Copy the comment and remove \ escapes */ for (p = str->str, e = 1; e < l; e++) *p++ = (src[e] == '\\'? src[++e] : src[e]); push_string( end_shared_string( str ) ); f_aggregate(2); n++; } /* Skip the comment altogether */ src += l+1; cnt -= l+1; break; case CT_WHITE: /* Whitespace, just ignore it */ src++; --cnt; break; default: if(*src == '\0') { /* Multiple occurance header. Ignore all but first. */ cnt = 0; break; } Pike_error( "Invalid character in header field\n" ); } /* Create the resulting array and push it */ arr = aggregate_array( n ); pop_n_elems( args ); push_array( arr ); } /*! @decl array(string|int) tokenize(string header, int|void flags) *! *! A structured header field, as specified by @rfc{822@}, is constructed from *! a sequence of lexical elements. *! *! @param header *! The header value to parse. *! *! @param flags *! An optional set of flags. Currently only one flag is defined: *! @int *! @value TOKENIZE_KEEP_ESCAPES *! Keep backslash-escapes in quoted-strings. *! @endint *! *! The lexical elements parsed are: *! @dl *! @item *! individual special characters *! @item *! quoted-strings *! @item *! domain-literals *! @item *! comments *! @item *! atoms *! @enddl *! *! This function will analyze a string containing the header value, *! and produce an array containing the lexical elements. *! *! Individual special characters will be returned as characters (i.e. *! @expr{int@}s). *! *! Quoted-strings, domain-literals and atoms will be decoded and returned *! as strings. *! *! Comments are not returned in the array at all. *! *! @note *! As domain-literals are returned as strings, there is no way to tell the *! domain-literal @tt{[127.0.0.1]@} from the quoted-string *! @tt{"[127.0.0.1]"@}. Hopefully this won't cause any problems. *! Domain-literals are used seldom, if at all, anyway... *! *! The set of special-characters is the one specified in @rfc{1521@} *! (i.e. @expr{"<", ">", "@@", ",", ";", ":", "\", "/", "?", "="@}), *! and not the set specified in @rfc{822@}. *! *! @seealso *! @[MIME.quote()], @[tokenize_labled()], *! @[decode_words_tokenized_remapped()]. */ static void f_tokenize( INT32 args ) { low_tokenize("MIME.tokenize", args, 0 ); } /*! @decl array(array(string|int)) tokenize_labled(string header, @ *! int|void flags) *! *! Similar to @[tokenize()], but labels the contents, by making *! arrays with two elements; the first a label, and the second *! the value that @[tokenize()] would have put there, except *! for that comments are kept. *! *! @param header *! The header value to parse. *! *! @param flags *! An optional set of flags. Currently only one flag is defined: *! @int *! @value TOKENIZE_KEEP_ESCAPES *! Keep backslash-escapes in quoted-strings. *! @endint *! *! The following labels exist: *! @string *! @value "encoded-word" *! Word encoded according to =?... *! @value "special" *! Special character. *! @value "word" *! Word. *! @value "domain-literal" *! Domain literal. *! @value "comment" *! Comment. *! @endstring *! *! @seealso *! @[MIME.quote()], @[tokenize()], *! @[decode_words_tokenized_labled_remapped()] */ static void f_tokenize_labled( INT32 args ) { low_tokenize("MIME.tokenize_labled", args, 1); } /* Convenience function for quote() which determines if a sequence of * characters can be stored as an atom. */ static int check_atom_chars( unsigned char *str, ptrdiff_t len ) { /* Atoms must contain at least 1 character... */ if (len < 1) return 0; /* Check the individual characters */ while (len--) if (*str >= 0x80 || rfc822ctype[*str] != CT_ATOM) return 0; else str++; /* Ok, it's safe */ return 1; } /* This one check is a sequence of charactes is actually an encoded word. */ static int check_encword( unsigned char *str, ptrdiff_t len ) { int q = 0; /* An encoded word begins with =?, ends with ?= and contains 2 internal ? */ if (len < 6 || str[0] != '=' || str[1] != '?' || str[len-2] != '?' || str[len-1] != '=') return 0; /* Remove =? and ?= */ len -= 4; str += 2; /* Count number of internal ? */ while (len--) if (*str++ == '?') if(++q > 2) return 0; /* If we found exactly 2, this is an encoded word. */ return q == 2; } /* MIME.quote() */ /*! @decl string quote(array(string|int) lexical_elements); *! *! This function is the inverse of the @[MIME.tokenize] function. *! *! A header field value is constructed from a sequence of lexical elements. *! Characters (@expr{int@}s) are taken to be special-characters, whereas *! strings are encoded as atoms or quoted-strings, depending on whether *! they contain any special characters. *! *! @note *! There is no way to construct a domain-literal using this function. *! Neither can it be used to produce comments. *! *! @seealso *! @[MIME.tokenize()] */ static void f_quote( INT32 args ) { struct svalue *item; INT32 cnt; struct string_builder buf; int prev_atom = 0; if (args != 1) Pike_error( "Wrong number of arguments to MIME.quote()\n" ); else if (TYPEOF(sp[-1]) != T_ARRAY) Pike_error( "Wrong type of argument to MIME.quote()\n" ); /* Quote array in sp[-1].u.array. Once again we'll rely on a string_builder to collect the output string. */ init_string_builder( &buf, 0 ); for (cnt=sp[-1].u.array->size, item=sp[-1].u.array->item; cnt--; item++) { if (TYPEOF(*item) == T_INT) { /* Single special character */ string_builder_putchar( &buf, item->u.integer ); prev_atom = 0; } else if (TYPEOF(*item) != T_STRING) { /* Neither int or string. Too bad... */ free_string_builder( &buf ); Pike_error( "Wrong type of argument to MIME.quote()\n" ); } else if (item->u.string->size_shift != 0) { free_string_builder( &buf ); Pike_error( "Char out of range for MIME.quote()\n" ); } else { /* It's a string, so we'll store it either as an atom, or as a quoted-string */ struct pike_string *str = item->u.string; /* In case the previous item was also a string, we'll add a single whitespace as a delimiter */ if (prev_atom) string_builder_putchar( &buf, ' ' ); if ((str->len>5 && str->str[0]=='=' && str->str[1]=='?' && check_encword((unsigned char *)str->str, str->len)) || check_atom_chars((unsigned char *)str->str, str->len)) { /* Valid atom without quotes... */ string_builder_binary_strcat( &buf, str->str, str->len ); } else { /* Have to use quoted-string */ ptrdiff_t len = str->len; char *src = str->str; string_builder_putchar( &buf, '"' ); while(len--) { if(*src=='"' || *src=='\\' || *src=='\r') /* Some characters have to be escaped even within quotes... */ string_builder_putchar( &buf, '\\' ); string_builder_putchar( &buf, (*src++)&0xff ); } string_builder_putchar( &buf, '"' ); } prev_atom = 1; } } /* Return the result */ pop_n_elems( 1 ); push_string( finish_string_builder( &buf ) ); } /*! @decl string quote_labled(array(array(string|int)) tokens) *! *! This function performs the reverse operation of @[tokenize_labled()]. *! *! @seealso *! @[MIME.quote()], @[MIME.tokenize_labled()] */ static void f_quote_labled( INT32 args ) { struct svalue *item; INT32 cnt; struct string_builder buf; int prev_atom = 0; if (args != 1) Pike_error( "Wrong number of arguments to MIME.quote_labled()\n" ); else if (TYPEOF(sp[-1]) != T_ARRAY) Pike_error( "Wrong type of argument to MIME.quote_labled()\n" ); /* Quote array in sp[-1].u.array. Once again we'll rely on a string_builder to collect the output string. */ init_string_builder( &buf, 0 ); for (cnt=sp[-1].u.array->size, item=sp[-1].u.array->item; cnt--; item++) { if (TYPEOF(*item) != T_ARRAY || item->u.array->size<2 || TYPEOF(item->u.array->item[0]) != T_STRING) { free_string_builder( &buf ); Pike_error( "Wrong type of argument to MIME.quote_labled()\n" ); } if (c_compare_string( item->u.array->item[0].u.string, "special", 7 )) { if(TYPEOF(item->u.array->item[1]) != T_INT) { free_string_builder( &buf ); Pike_error( "Wrong type of argument to MIME.quote_labled()\n" ); } /* Single special character */ string_builder_putchar( &buf, item->u.array->item[1].u.integer ); prev_atom = 0; } else if(TYPEOF(item->u.array->item[1]) != T_STRING) { /* All the remaining lexical items require item[1] to be a string */ free_string_builder( &buf ); Pike_error( "Wrong type of argument to MIME.quote_labled()\n" ); } else if (item->u.array->item[1].u.string->size_shift != 0) { free_string_builder( &buf ); Pike_error( "Char out of range for MIME.quote_labled()\n" ); } else if (c_compare_string( item->u.array->item[0].u.string, "word", 4 )){ /* It's a word, so we'll store it either as an atom, or as a quoted-string */ struct pike_string *str = item->u.array->item[1].u.string; /* In case the previous item was also a string, we'll add a single whitespace as a delimiter */ if (prev_atom) string_builder_putchar( &buf, ' ' ); if ((str->len>5 && str->str[0]=='=' && str->str[1]=='?' && check_encword((unsigned char *)str->str, str->len)) || check_atom_chars((unsigned char *)str->str, str->len)) { /* Valid atom without quotes... */ string_builder_binary_strcat( &buf, str->str, str->len ); } else { /* Have to use quoted-string */ ptrdiff_t len = str->len; char *src = str->str; string_builder_putchar( &buf, '"' ); while(len--) { if(*src=='"' || *src=='\\' || *src=='\r') /* Some characters have to be escaped even within quotes... */ string_builder_putchar( &buf, '\\' ); string_builder_putchar( &buf, (*src++)&0xff ); } string_builder_putchar( &buf, '"' ); } prev_atom = 1; } else if (c_compare_string( item->u.array->item[0].u.string, "encoded-word", 12 )) { struct pike_string *str = item->u.array->item[1].u.string; /* Insert 'as is'. */ string_builder_binary_strcat( &buf, str->str, str->len ); prev_atom = 1; } else if (c_compare_string( item->u.array->item[0].u.string, "comment", 7 )) { struct pike_string *str = item->u.array->item[1].u.string; /* Encode comment */ ptrdiff_t len = str->len; char *src = str->str; string_builder_putchar( &buf, '(' ); while(len--) { if(*src=='(' || *src==')' || *src=='\\' || *src=='\r') /* Some characters have to be escaped even within comments... */ string_builder_putchar( &buf, '\\' ); string_builder_putchar( &buf, (*src++)&0xff ); } string_builder_putchar( &buf, ')' ); prev_atom = 0; } else if (c_compare_string( item->u.array->item[0].u.string, "domain-literal", 14 )) { struct pike_string *str = item->u.array->item[1].u.string; /* Encode domain-literal */ ptrdiff_t len = str->len; char *src = str->str; if (len<2 || src[0] != '[' || src[len-1] != ']') { free_string_builder( &buf ); Pike_error( "Illegal domain-literal passed to MIME.quote_labled()\n" ); } len -= 2; src++; string_builder_putchar( &buf, '[' ); while(len--) { if(*src=='[' || *src==']' || *src=='\\' || *src=='\r') /* Some characters have to be escaped within domain-literals... */ string_builder_putchar( &buf, '\\' ); string_builder_putchar( &buf, (*src++)&0xff ); } string_builder_putchar( &buf, ']' ); prev_atom = 0; } else { /* Unknown label. Too bad... */ free_string_builder( &buf ); Pike_error( "Unknown label passed to MIME.quote_labled()\n" ); } } /* Return the result */ pop_n_elems( 1 ); push_string( finish_string_builder( &buf ) ); } /*! @endmodule */

pike.git/ src/ modules/ MIME/ mime.c > 2ca858eda6f885ae15bc5e91692818185a7da2c7 [Annotate]