+++ /dev/null
-/*
-** Copyright 2003-2004 Double Precision, Inc. See COPYING for
-** distribution information.
-*/
-
-/*
-** $Id: encode.c,v 1.5 2005/11/16 02:23:15 mrsam Exp $
-*/
-#include "encode.h"
-#include <string.h>
-#include <stdlib.h>
-
-static int quoted_printable(struct libmail_encode_info *,
- const char *, size_t);
-static int base64(struct libmail_encode_info *,
- const char *, size_t);
-static int eflush(struct libmail_encode_info *,
- const char *, size_t);
-
-void libmail_encode_start(struct libmail_encode_info *info,
- const char *transfer_encoding,
- int (*callback_func)(const char *, size_t, void *),
- void *callback_arg)
-{
- info->output_buf_cnt=0;
- info->input_buf_cnt=0;
-
- switch (*transfer_encoding) {
- case 'q':
- case 'Q':
- info->encoding_func=quoted_printable;
- info->input_buffer[0]=0; /* Recycle for qp encoding */
- break;
- case 'b':
- case 'B':
- info->encoding_func=base64;
- break;
- default:
- info->encoding_func=eflush;
- break;
- }
- info->callback_func=callback_func;
- info->callback_arg=callback_arg;
-}
-
-int libmail_encode(struct libmail_encode_info *info,
- const char *ptr,
- size_t cnt)
-{
- return ((*info->encoding_func)(info, ptr, cnt));
-}
-
-int libmail_encode_end(struct libmail_encode_info *info)
-{
- int rc=(*info->encoding_func)(info, NULL, 0);
-
- if (rc == 0 && info->output_buf_cnt > 0)
- {
- rc= (*info->callback_func)(info->output_buffer,
- info->output_buf_cnt,
- info->callback_arg);
- info->output_buf_cnt=0;
- }
-
- return rc;
-}
-
-static int eflush(struct libmail_encode_info *info, const char *ptr, size_t n)
-{
- while (n > 0)
- {
- size_t i;
-
- if (info->output_buf_cnt == sizeof(info->output_buffer))
- {
- int rc= (*info->callback_func)(info->output_buffer,
- info->output_buf_cnt,
- info->callback_arg);
-
- info->output_buf_cnt=0;
- if (rc)
- return rc;
- }
-
- i=n;
-
- if (i > sizeof(info->output_buffer) - info->output_buf_cnt)
- i=sizeof(info->output_buffer) - info->output_buf_cnt;
-
- memcpy(info->output_buffer + info->output_buf_cnt, ptr, i);
- info->output_buf_cnt += i;
- ptr += i;
- n -= i;
- }
- return 0;
-}
-
-static int base64_flush(struct libmail_encode_info *);
-
-static int base64(struct libmail_encode_info *info,
- const char *buf, size_t n)
-{
- if (!buf)
- {
- int rc=0;
-
- if (info->input_buf_cnt > 0)
- rc=base64_flush(info);
-
- return rc;
- }
-
- while (n)
- {
- size_t i;
-
- if (info->input_buf_cnt == sizeof(info->input_buffer))
- {
- int rc=base64_flush(info);
-
- if (rc != 0)
- return rc;
- }
-
- i=n;
- if (i > sizeof(info->input_buffer) - info->input_buf_cnt)
- i=sizeof(info->input_buffer) - info->input_buf_cnt;
-
- memcpy(info->input_buffer + info->input_buf_cnt,
- buf, i);
- info->input_buf_cnt += i;
- buf += i;
- n -= i;
- }
- return 0;
-}
-
-static const char base64tab[]=
-"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-static int base64_flush(struct libmail_encode_info *info)
-{
- int a=0,b=0,c=0;
- int i, j;
- int d, e, f, g;
- char output_buf[ sizeof(info->input_buffer) / 3 * 4+1];
-
- for (j=i=0; i<info->input_buf_cnt; i += 3)
- {
- a=(unsigned char)info->input_buffer[i];
- b= i+1 < info->input_buf_cnt ?
- (unsigned char)info->input_buffer[i+1]:0;
- c= i+2 < info->input_buf_cnt ?
- (unsigned char)info->input_buffer[i+2]:0;
-
- d=base64tab[ a >> 2 ];
- e=base64tab[ ((a & 3 ) << 4) | (b >> 4)];
- f=base64tab[ ((b & 15) << 2) | (c >> 6)];
- g=base64tab[ c & 63 ];
- if (i + 1 >= info->input_buf_cnt) f='=';
- if (i + 2 >= info->input_buf_cnt) g='=';
- output_buf[j++]=d;
- output_buf[j++]=e;
- output_buf[j++]=f;
- output_buf[j++]=g;
- }
-
- info->input_buf_cnt=0;
-
- output_buf[j++]='\n';
- return eflush(info, output_buf, j);
-}
-
-static const char xdigit[]="0123456789ABCDEF";
-
-static int quoted_printable(struct libmail_encode_info *info,
- const char *p, size_t n)
-{
- char local_buf[256];
- int local_buf_cnt=0;
-
-#define QPUT(c) do { if (local_buf_cnt == sizeof(local_buf)) \
- { int rc=eflush(info, local_buf, local_buf_cnt); \
- local_buf_cnt=0; if (rc) return (rc); } \
- local_buf[local_buf_cnt]=(c); ++local_buf_cnt; } while(0)
-
- if (!p)
- return (0);
-
- while (n)
- {
-
-
- /*
- ** Repurpose input_buffer[0] as a flag whether the previous
- ** character was a space.
- **
- ** A space before a newline gets escaped.
- */
-
- if (info->input_buffer[0])
- {
- if (*p == '\n')
- {
- QPUT('=');
- QPUT('2');
- QPUT('0');
- }
- else
- {
- QPUT(' ');
- }
- ++info->input_buf_cnt;
- }
-
- info->input_buffer[0]=0;
-
- if (*p == ' ')
- {
- info->input_buffer[0]=1;
- p++;
- --n;
- continue;
- }
-
- if (info->input_buf_cnt > 72 && *p != '\n')
- {
- QPUT('=');
- QPUT('\n');
- info->input_buf_cnt=0;
- }
-
- if ( *p == '\n')
- info->input_buf_cnt=0;
- else if (*p < ' ' || *p == '=' || *p >= 0x7F)
- {
- QPUT('=');
- QPUT(xdigit[ (*p >> 4) & 15]);
- QPUT(xdigit[ *p & 15 ]);
- info->input_buf_cnt += 3;
- p++;
- --n;
- continue;
- }
- else info->input_buf_cnt++;
-
- QPUT( *p);
- p++;
- --n;
- }
-
- if (local_buf_cnt > 0)
- return eflush(info, local_buf, local_buf_cnt);
-
- return 0;
-}
HCoop / hcoop / debian / courier-authlib.git / blobdiff
