+++ /dev/null
-/*
-** Copyright 2003 Double Precision, Inc.
-** See COPYING for distribution information.
-**
-** $Id: utf7.c,v 1.3 2004/05/23 14:28:25 mrsam Exp $
-*/
-
-#include "unicode.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-
-static const char base64tab[]=
-"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-struct dec_base64_struct {
-
- unsigned char base64buf[4];
- int cnt;
-
- unicode_char uc1;
- int ucnt;
-
- int flushing;
- int flushed;
-};
-
-/* Poor man's base64 decoder */
-
-static int dec_b64_uchar(struct dec_base64_struct *dc,
- unsigned char uuc,
- unicode_char **buffer,
- size_t *buflen)
-{
- if (dc->flushed)
- return 0; /* Flushing trailing junk */
-
- dc->uc1 <<= 8;
- dc->uc1 |= uuc;
-
- ++dc->ucnt;
-
- if (dc->ucnt == 2)
- {
- if (dc->uc1 < 0xD800 || dc->uc1 > 0xDFFF)
- /* Not surrogate pair */
- {
- if ( *buffer )
- (*buffer)[*buflen]=dc->uc1;
- ++*buflen;
- dc->uc1=0;
- dc->ucnt=0;
- if (dc->flushing)
- dc->flushed=1;
- return (0);
- }
-
- if (dc->uc1 > 0xDBFF)
- return -1; /* Bad surrogate pair */
- return 0;
- }
-
- if (dc->ucnt == 4)
- {
- unicode_char uc2= (dc->uc1 >> 16) & 0xFFFF;
-
- dc->uc1 &= 0xFFFF;
-
- if (dc->uc1 < 0xDC00 || dc->uc1 > 0xDFFF)
- return -1;
-
-
- if (*buffer)
- {
- (*buffer)[*buflen] = ((uc2 & 0x3FF) << 10) |
- (dc->uc1 & 0x3FF);
- }
- ++*buflen;
-
- dc->uc1=0;
- dc->ucnt=0;
- if (dc->flushing)
- dc->flushed=1;
- return (0);
- }
- return 0;
-}
-
-static int dec_b64_char(struct dec_base64_struct *dc,
- char c,
- unicode_char **buffer,
- size_t *buflen)
-{
- dc->base64buf[dc->cnt]=c;
- if (++dc->cnt >= 4) /* Four characters to base64 decode */
- {
- char a,b,c;
-
- int w=dc->base64buf[0];
- int x=dc->base64buf[1];
- int y=dc->base64buf[2];
- int z=dc->base64buf[3];
-
- a= (w << 2) | (x >> 4);
- b= (x << 4) | (y >> 2);
- c= (y << 6) | z;
- dc->cnt=0;
-
- if (dec_b64_uchar(dc, a, buffer, buflen))
- return -1;
-
- if (dec_b64_uchar(dc, b, buffer, buflen))
- return -1;
-
- if (dec_b64_uchar(dc, c, buffer, buflen))
- return -1;
- }
- return 0;
-}
-
-static unicode_char *tou(const struct unicode_info *foo, const char *p,
- int *err)
-{
- int pass;
- size_t i;
- unicode_char *buffer=NULL;
- size_t buflen=0;
-
- /* Two passes. Count the output, alloc buffer, do it */
-
- for (pass=0; pass<2; pass++)
- {
- if (pass)
- {
- if ((buffer=malloc((buflen+1)*sizeof(unicode_char)))
- == NULL)
- return NULL;
- }
- buflen=0;
-
- for (i=0; p[i]; i++)
- {
- char *q;
- struct dec_base64_struct dc;
-
- if (p[i] != '+')
- {
- if (buffer)
- {
- buffer[buflen]=(unsigned char)p[i];
- }
- ++buflen;
- continue;
- }
-
- if (p[++i] == 0)
- break;
-
- if (p[i] == '-')
- {
- if (buffer)
- buffer[buflen]='+';
- ++buflen;
- continue;
- }
-
- dc.cnt=0;
- dc.ucnt=0;
- dc.uc1=0;
- dc.flushing=0;
- dc.flushed=0;
-
- while ( p[i] && (q=strchr(base64tab, p[i])) != NULL)
- {
- if (dec_b64_char(&dc, (q-base64tab),
- &buffer,
- &buflen))
- {
- if (err)
- {
- *err=i;
- errno=EINVAL;
- return NULL;
- }
-
- /* Recover from decoding error */
-
- dc.cnt=0;
- dc.ucnt=0;
- dc.uc1=0;
- }
- ++i;
- }
-
- dc.flushing=1;
-
- while (dc.cnt > 0)
- {
- if (dec_b64_char(&dc, 0,
- &buffer,
- &buflen))
- {
- if (err)
- {
- *err=i;
- errno=EINVAL;
- return NULL;
- }
- dc.cnt=0;
- dc.ucnt=0;
- dc.uc1=0;
- }
- }
-
- if (p[i] == 0)
- break;
-
- if (p[i] != '-')
- --i;
- }
-
-
- if (pass)
- buffer[buflen]=0;
- }
-
- return buffer;
-}
-
-/* Poor man's base64 encoder */
-
-struct enc_base64_struct {
-
- char base64buf[3];
- int cnt;
- int clip;
-};
-
-static void encode_base64_char(struct enc_base64_struct *p,
- char c,
- char **buffer,
- size_t *buflen)
-{
- p->base64buf[p->cnt]=c;
-
- if (++p->cnt >= 3) /* Encode three octets in base64 */
- {
- int a, b, c;
- int d, e, f, g;
-
- a=(unsigned char)p->base64buf[0];
- b=(unsigned char)p->base64buf[1];
- c=(unsigned char)p->base64buf[2];
-
- d=base64tab[ a >> 2 ];
- e=base64tab[ ((a & 3 ) << 4) | (b >> 4)];
- f=base64tab[ ((b & 15) << 2) | (c >> 6)];
- g=base64tab[ c & 63 ];
-
- p->cnt=0;
-
- if (*buffer)
- {
- (*buffer)[*buflen]=d;
- (*buffer)[*buflen+1]=e;
- }
- *buflen += 2;
-
- if (p->clip < 2) /* Clip trailing junk, don't need it */
- {
- if (*buffer)
- {
- (*buffer)[*buflen]=f;
- }
- ++*buflen;
- }
-
- if (p->clip < 1)
- {
- if (*buffer)
- {
- (*buffer)[*buflen]=g;
- }
- ++*buflen;
- }
- }
-}
-
-static void encode_base64_u16(struct enc_base64_struct *p,
- unicode_char uc,
- char **buffer,
- size_t *buflen)
-{
- encode_base64_char(p, (uc >> 8) & 255, buffer, buflen);
- encode_base64_char(p, uc & 255, buffer, buflen);
-}
-
-static void encode_base64_u32(struct enc_base64_struct *p,
- unicode_char uc,
- char **buffer,
- size_t *buflen)
-{
- if ((uc >= 0xD800 && uc <= 0xDFFF) /* Really illegal, but punt */
- || uc > 0xFFFFU)
- {
- encode_base64_u16(p, ((uc >> 10) & 0x3FF) | 0xD800,
- buffer, buflen);
- encode_base64_u16(p, (uc & 0x3FF) | 0xDC00,
- buffer, buflen);
- }
- else
- {
- encode_base64_u16(p, uc, buffer, buflen);
- }
-}
-
-
-#define LITERAL(c) ( (c) == '\n' || (c) == '\r' || (c) == '\t' || (c) == ' ' \
- || ( (c) >= 33 && c <= 125 && c != 92))
-
-static char *fromu(const struct unicode_info *foo, const unicode_char *p,
- int *err)
-{
- char *buffer=0;
- size_t buflen=0;
- int pass;
- size_t i;
-
- for (pass=0; pass<2; pass++)
- {
- if (pass)
- {
- if ((buffer=malloc(buflen+1)) == NULL)
- return NULL;
- }
- buflen=0;
-
- for (i=0; p[i]; i++)
- {
- struct enc_base64_struct eb;
-
- if (p[i] == '+')
- {
- if (pass)
- {
- buffer[buflen]='+';
- buffer[buflen+1]='-';
- }
- buflen += 2;
- continue;
- }
-
- if (LITERAL(p[i]))
- {
- if (pass)
- {
- buffer[buflen]=(char)p[i];
- }
- ++buflen;
- continue;
- }
-
- if (pass)
- buffer[buflen]='+';
- ++buflen;
-
- eb.cnt=0;
- eb.clip=0;
-
- do
- {
- if (p[i] >= 0x10FFFF)
- {
- if (err)
- {
- *err=i;
- errno=EINVAL;
- return NULL;
- }
- encode_base64_u32(&eb, 0xFFFD,
- &buffer, &buflen);
- }
- else
- {
- encode_base64_u32(&eb, p[i],
- &buffer, &buflen);
- }
- ++i;
- } while ( p[i] && !LITERAL(p[i]));
-
- switch (eb.cnt) {
- case 2:
- eb.clip=2;
- break;
- case 3:
- eb.clip=1;
- break;
- }
-
- while (eb.cnt)
- {
- encode_base64_char(&eb, 0, &buffer, &buflen);
- }
-
- if (!p[i])
- {
- if (pass)
- {
- buffer[buflen]='-';
- }
- ++buflen;
- break;
- }
-
- if (p[i] == '-')
- {
- if (pass)
- {
- buffer[buflen]='-';
- }
- ++buflen;
- }
- --i;
- }
-
- if (pass)
- buffer[buflen]=0;
- }
-
- return buffer;
-}
-
-
-/*
-** UTF7.toupper/tolower/totitle is implemented by converting UTF8 to
-** UCS-4, applying the unicode table lookup, then converting it back to
-** UTF7
-*/
-
-static char *toupper_func(const struct unicode_info *u,
- const char *cp, int *ip)
-{
- unicode_char *uc=tou(u, cp, ip), *p;
- char *s;
-
- if (!uc) return (0);
-
- for (p=uc; *p; p++)
- *p=unicode_uc(*p);
-
- s=fromu(u, uc, NULL);
- if (!s && ip)
- *ip=0;
- free(uc);
- return (s);
-}
-
-static char *tolower_func(const struct unicode_info *u,
- const char *cp, int *ip)
-{
- unicode_char *uc=tou(u, cp, ip), *p;
- char *s;
-
- if (!uc) return (0);
-
- for (p=uc; *p; p++)
- *p=unicode_lc(*p);
-
- s=fromu(u, uc, NULL);
- free(uc);
- if (!s && ip)
- *ip=0;
- return (s);
-}
-
-static char *totitle_func(const struct unicode_info *u,
- const char *cp, int *ip)
-{
- unicode_char *uc=tou(u, cp, ip), *p;
- char *s;
-
- if (!uc) return (0);
-
- for (p=uc; *p; p++)
- *p=unicode_tc(*p);
-
- s=fromu(u, uc, NULL);
- if (!s && ip)
- *ip=0;
- free(uc);
- return (s);
-}
-
-const struct unicode_info unicode_UTF7 = {
- "UTF-7",
- UNICODE_UTF | UNICODE_MB |
- UNICODE_HEADER_QUOPRI | UNICODE_BODY_QUOPRI,
- tou,
- fromu,
- toupper_func,
- tolower_func,
- totitle_func};
-
-#if 0
-extern const struct unicode_info unicode_UTF8;
-
-int main(int argc, char **argv)
-{
- char *a, *b, *c;
-
- a=unicode_xconvert("A+ImIDkQ.", &unicode_UTF7,
- &unicode_UTF8);
- b=unicode_xconvert("Hi Mom -+Jjo--!", &unicode_UTF7,
- &unicode_UTF8);
- c=unicode_xconvert("+ZeVnLIqe-", &unicode_UTF7,
- &unicode_UTF8);
-
- printf("%s\n", a);
- printf("%s\n", b);
- printf("%s\n", c);
-
- printf("%s\n", unicode_xconvert(a, &unicode_UTF8, &unicode_UTF7));
- printf("%s\n", unicode_xconvert(b, &unicode_UTF8, &unicode_UTF7));
- printf("%s\n", unicode_xconvert(c, &unicode_UTF8, &unicode_UTF7));
-
- return 0;
-}
-#endif
HCoop / hcoop / debian / courier-authlib.git / blobdiff