static void test_quoted_printable_decode(void)
{
static struct test_quoted_printable_decode_data data[] = {
{ "foo \r\nbar=", "foo\r\nbar", 1, 0 },
{ "foo\t=\nbar", "foo\tbar", 0, 0 },
{ "foo = \n=01", "foo \001", 0, 0 },
{ "foo =\t\r\nbar", "foo bar", 0, 0 },
{ "foo =\r\n=01", "foo \001", 0, 0 },
{ "foo \nbar=", "foo\nbar", 1, 0 },
{ "=0A=0D ", "\n\r", 2, 0 },
{ "foo_bar", "foo_bar", 0, 0 },
{ "foo=", "foo", 1, 0 },
{ "foo= ", "foo", 3, 0 },
{ "foo=A", "foo", 2, 0 },
{ "foo=Ax", "foo=Ax", 0, -1 },
{ "foo=Ax=xy", "foo=Ax=xy", 0, -1 }
};
buffer_t *buf;
unsigned int i, start, end, len;
size_t src_pos;
int ret;
test_begin("quoted printable decode");
buf = buffer_create_dynamic(pool_datastack_create(), 128);
for (i = 0; i < N_ELEMENTS(data); i++) {
len = strlen(data[i].input);
ret = quoted_printable_decode((const void *)data[i].input, len,
&src_pos, buf);
test_assert(ret == data[i].ret);
test_assert(src_pos + data[i].end_skip == len);
test_assert(strcmp(data[i].output, str_c(buf)) == 0);
buffer_set_used_size(buf, 0);
for (start = 0, end = 1; end <= len; ) {
quoted_printable_decode(CONST_PTR_OFFSET(data[i].input, start),
end - start, &src_pos, buf);
src_pos += start;
start = src_pos;
if (src_pos <= end)
end++;
else
end = src_pos + 1;
}
test_assert(src_pos + data[i].end_skip == len);
test_assert(strcmp(data[i].output, str_c(buf)) == 0);
buffer_set_used_size(buf, 0);
}
test_end();
}
static int
i_stream_qp_try_decode_input(struct qp_decoder_istream *bstream, bool eof)
{
struct istream_private *stream = &bstream->istream;
const unsigned char *data;
size_t size, avail, buffer_avail, pos;
buffer_t buf;
int ret;
data = i_stream_get_data(stream->parent, &size);
if (size == 0)
return 0;
/* normally the decoded quoted-printable content can't be larger than
the encoded content, but because we always use CRLFs, it may use
twice as much space by only converting LFs to CRLFs. */
i_stream_try_alloc(stream, size, &avail);
buffer_avail = stream->buffer_size - stream->pos;
if (size > buffer_avail/2) {
/* can't fit everything to destination buffer.
write as much as we can. */
size = buffer_avail/2;
if (size == 0)
return -2;
}
buffer_create_from_data(&buf, stream->w_buffer + stream->pos,
buffer_avail);
ret = !eof ? quoted_printable_decode(data, size, &pos, &buf) :
quoted_printable_decode_final(data, size, &pos, &buf);
if (ret < 0) {
io_stream_set_error(&stream->iostream,
"Invalid quoted-printable data: 0x%s",
binary_to_hex(data+pos, I_MAX(size-pos, 8)));
stream->istream.stream_errno = EINVAL;
return -1;
}
stream->pos += buf.used;
i_stream_skip(stream->parent, pos);
return pos > 0 ? 1 : 0;
}
static int
i_stream_qp_try_decode_input(struct qp_decoder_istream *bstream, bool eof)
{
struct istream_private *stream = &bstream->istream;
const unsigned char *data;
size_t size, avail, buffer_avail, pos;
buffer_t buf;
int ret;
data = i_stream_get_data(stream->parent, &size);
if (size == 0)
return 0;
/* the decoded quoted-printable content can never be larger than the
encoded content. at worst they are equal. */
i_stream_try_alloc(stream, size, &avail);
buffer_avail = stream->buffer_size - stream->pos;
if (size > buffer_avail) {
/* can't fit everything to destination buffer.
write as much as we can. */
size = buffer_avail;
if (size == 0)
return -2;
}
buffer_create_from_data(&buf, stream->w_buffer + stream->pos,
buffer_avail);
ret = !eof ? quoted_printable_decode(data, size, &pos, &buf) :
quoted_printable_decode_final(data, size, &pos, &buf);
if (ret < 0) {
stream->istream.stream_errno = EINVAL;
return -1;
}
stream->pos += buf.used;
i_stream_skip(stream->parent, pos);
return pos > 0 ? 1 : 0;
}
static bool message_decode_body(struct message_decoder_context *ctx,
struct message_block *input,
struct message_block *output)
{
const unsigned char *data = NULL;
size_t pos = 0, size = 0;
int ret;
if (ctx->encoding_buf->used != 0) {
/* @UNSAFE */
buffer_append(ctx->encoding_buf, input->data, input->size);
}
switch (ctx->message_cte) {
case MESSAGE_CTE_UNKNOWN:
/* just skip this body */
return FALSE;
case MESSAGE_CTE_78BIT:
case MESSAGE_CTE_BINARY:
data = input->data;
size = pos = input->size;
break;
case MESSAGE_CTE_QP:
buffer_set_used_size(ctx->buf, 0);
if (ctx->encoding_buf->used != 0) {
(void)quoted_printable_decode(ctx->encoding_buf->data,
ctx->encoding_buf->used,
&pos, ctx->buf);
} else {
(void)quoted_printable_decode(input->data, input->size,
&pos, ctx->buf);
}
data = ctx->buf->data;
size = ctx->buf->used;
break;
case MESSAGE_CTE_BASE64:
buffer_set_used_size(ctx->buf, 0);
if (ctx->encoding_buf->used != 0) {
ret = base64_decode(ctx->encoding_buf->data,
ctx->encoding_buf->used,
&pos, ctx->buf);
} else {
ret = base64_decode(input->data, input->size,
&pos, ctx->buf);
}
if (ret < 0) {
/* corrupted base64 data, don't bother with
the rest of it */
return FALSE;
}
if (ret == 0) {
/* end of base64 input */
pos = input->size;
buffer_set_used_size(ctx->encoding_buf, 0);
}
data = ctx->buf->data;
size = ctx->buf->used;
break;
}
if (ctx->encoding_buf->used != 0)
buffer_delete(ctx->encoding_buf, 0, pos);
else if (pos != input->size) {
buffer_append(ctx->encoding_buf,
input->data + pos, input->size - pos);
}
if (ctx->binary_input) {
output->data = data;
output->size = size;
} else if (ctx->charset_utf8 || ctx->charset_trans == NULL) {
/* handle unknown charsets the same as UTF-8. it might find
usable ASCII text. */
buffer_set_used_size(ctx->buf2, 0);
if (ctx->normalizer != NULL) {
(void)ctx->normalizer(data, size, ctx->buf2);
output->data = ctx->buf2->data;
output->size = ctx->buf2->used;
} else if (uni_utf8_get_valid_data(data, size, ctx->buf2)) {
output->data = data;
output->size = size;
} else {
output->data = ctx->buf2->data;
output->size = ctx->buf2->used;
}
} else {
buffer_set_used_size(ctx->buf2, 0);
if (ctx->translation_size != 0)
translation_buf_decode(ctx, &data, &size);
pos = size;
(void)charset_to_utf8(ctx->charset_trans,
data, &pos, ctx->buf2);
if (pos != size) {
ctx->translation_size = size - pos;
i_assert(ctx->translation_size <=
sizeof(ctx->translation_buf));
memcpy(ctx->translation_buf, data + pos,
ctx->translation_size);
}
output->data = ctx->buf2->data;
output->size = ctx->buf2->used;
}
output->hdr = NULL;
return TRUE;
}