app_qp.c

最新MTK手机软件源码

/*****************************************************************************
*  Copyright Statement:
*  --------------------
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*  herein is confidential. The software may not be copied and the information
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*
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*  SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
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*****************************************************************************/

/*****************************************************************************
 *
 * Filename:
 * ---------
 * app_qp.c
 *
 * Project:
 * --------
 *   MAUI
 *
 * Description:
 * ------------
 *   This file contains Quote Printable (QP) decode / encode functions.
 *
 * Author:
 * -------
 * -------
 *
 *============================================================================
 *             HISTORY
 * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *------------------------------------------------------------------------------
 * removed!
 *
 * removed!
 * removed!
 * removed!
 *
 * removed!
 * removed!
 * removed!
 *
 *------------------------------------------------------------------------------
 * Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *============================================================================
 ****************************************************************************/

#include <ctype.h>      /* isxdigit */

#include "kal_release.h"
#include "app_qp.h"


/*****************************************************************************
 * FUNCTION
 *  applib_qprint_decode
 * DESCRIPTION
 *  This function is used to decode quoted printable string.
 * PARAMETERS
 *  src         [IN]        Pointer to the buffer containing encoded data
 *  srcl        [IN]        Length of the encoded data
 *  dest        [IN]        Length of destination buffer Will append null character.
 *  destl       [IN]        
 * RETURNS
 *  negative: error
 *  ow: Length of the decoded data (not include null character)
 *****************************************************************************/
kal_int32 applib_qprint_decode(kal_char *src, kal_uint32 srcl, kal_char *dest, kal_uint32 destl)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    kal_char dst[APP_QP_BUF_LEN];
    kal_char *ret = dst;
    kal_char *d = ret;
    kal_char *t = d;
    kal_char *s = src;
    kal_char c, e;
    kal_uint32 temp_len = 0, rt = 0;
    kal_uint32 k;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    kal_mem_set(dst, 0, APP_QP_BUF_LEN);

    k = (kal_uint32) (s - src);
    while (k < srcl)
    {
        switch (c = *s++)
        {               /* what type of character is it? */
            case '=':   /* quoting character */
                if (((kal_uint32) (s - src)) < srcl)
                    switch (c = *s++)
                    {
                        case '\0':      /* end of data */
                            s--;        /* back up pointer */
                            break;
                        case '\015':    /* non-significant line break */
                            if ((((kal_uint32) (s - src)) < srcl) && (*s == '\012'))
                            {
                                s++;
                            }
                        case '\012':    /* bare LF */
                            t = d;      /* accept any leading spaces */
                            break;
                        default:        /* two hex digits then */

                            if (!isxdigit(c) || !(((kal_uint32) (s - src)) < srcl))
                            {
                                return -1;
                            }

                            e = *s++;

                            if (!e || !isxdigit(e))
                            {
                                return -1;
                            }

                            if (isdigit(c))
                            {
                                c -= '0';
                            }
                            else
                            {
                                c -= (isupper(c) ? 'A' - 10 : 'a' - 10);
                            }
                            if (isdigit(e))
                            {
                                e -= '0';
                            }
                            else
                            {
                                e -= (isupper(e) ? 'A' - 10 : 'a' - 10);
                            }
                            *d++ = e + (c << 4);    /* merge the two hex digits */
                            temp_len++;
                            if (temp_len == APP_QP_BUF_LEN)
                            {
                                if (destl < APP_QP_BUF_LEN)
                                {
                                    return -1;
                                }

                                destl -= APP_QP_BUF_LEN;

                                temp_len = 0;
                                kal_mem_cpy(dest + rt, dst, APP_QP_BUF_LEN);
                                kal_mem_set(dst, 0, APP_QP_BUF_LEN);
                                rt += APP_QP_BUF_LEN;
                                d = dst;
                            }
                            t = d;  /* note point of non-space */
                            break;
                    }
                break;
            case ' ':
                *d++ = c;
                temp_len++;
                if (temp_len == APP_QP_BUF_LEN)
                {
                    if (destl < APP_QP_BUF_LEN)
                    {
                        return -1;
                    }

                    destl -= APP_QP_BUF_LEN;

                    temp_len = 0;
                    kal_mem_cpy(dest + rt, dst, APP_QP_BUF_LEN);
                    kal_mem_set(dst, 0, APP_QP_BUF_LEN);
                    d = dst;
                    rt += APP_QP_BUF_LEN;
                }
                break;
            case '\015':    /* end of line */
            case '\012':    /* bare LF */
                d = t;
            default:
                *d++ = c;   /* stash the character */
                temp_len++;
                if (temp_len == APP_QP_BUF_LEN)
                {
                    if (destl < APP_QP_BUF_LEN)
                    {
                        return -1;
                    }

                    destl -= APP_QP_BUF_LEN;

                    temp_len = 0;
                    kal_mem_cpy(dest + rt, dst, APP_QP_BUF_LEN);
                    kal_mem_set(dst, 0, APP_QP_BUF_LEN);
                    d = dst;
                    rt += APP_QP_BUF_LEN;
                }
                t = d;  /* note point of non-space */
        }
        k = (kal_uint32) (s - src);
    }   /* while */

    if (temp_len > 0)
    {
        if (destl < temp_len)
        {
            return -1;
        }