src/lib-mail/quoted-printable.c

	quoted-printable.c revision def516ea503a60f20d510c14d5070b7ff5bbddf4
/* Copyright (C) 2002 Timo Sirainen */

#include "lib.h"
#include "buffer.h"
#include "hex-binary.h"
#include "quoted-printable.h"

void quoted_printable_decode(const unsigned char *src, size_t src_size,
                 size_t *src_pos_r, Buffer *dest)
{
    char hexbuf[3];
    size_t src_pos, next;

    hexbuf[2] = '\0';

    next = 0;
    for (src_pos = 0; src_pos < src_size; src_pos++) {
        if (src[src_pos] != '_' && src[src_pos] != '=')
            continue;

        buffer_append(dest, src, src_pos - next);

        if (src[src_pos] == '_') {
            buffer_append(dest, " ", 1);
            next = src_pos+1;
        } else {
            /* =<hex> */
            if (src_pos+2 >= src_size)
                break;

            hexbuf[0] = src[src_pos+1];
            hexbuf[1] = src[src_pos+2];

            if (hex_to_binary(hexbuf, dest) == 1) {
                src_pos += 2;
                next = src_pos+1;
            } else {
                /* non-hex data */
                next = src_pos;
            }
        }
    }

    if (src_pos_r != NULL)
        *src_pos_r = src_pos;
}