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/* Copyright (c) 2007-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "istream-private.h"
#include "istream-crlf.h"
struct crlf_istream {
struct istream_private istream;
bool pending_cr:1;
bool last_cr:1;
};
static int i_stream_crlf_read_common(struct crlf_istream *cstream)
{
struct istream_private *stream = &cstream->istream;
size_t size, avail;
ssize_t ret;
size = i_stream_get_data_size(stream->parent);
if (size == 0) {
ret = i_stream_read_memarea(stream->parent);
if (ret <= 0) {
i_assert(ret != -2); /* 0 sized buffer can't be full */
stream->istream.stream_errno =
stream->parent->stream_errno;
stream->istream.eof = stream->parent->eof;
return ret;
}
size = i_stream_get_data_size(stream->parent);
i_assert(size != 0);
}
if (!i_stream_try_alloc(stream, size, &avail))
return -2;
return 1;
}
static ssize_t i_stream_crlf_read_crlf(struct istream_private *stream)
{
struct crlf_istream *cstream =
container_of(stream, struct crlf_istream, istream);
const unsigned char *data, *ptr, *src, *src_end;
unsigned char *dest, *dest_end;
size_t size, copy_len;
ssize_t ret;
ret = i_stream_crlf_read_common(cstream);
if (ret <= 0)
return ret;
/* at least one byte was read */
data = i_stream_get_data(stream->parent, &size);
dest = stream->w_buffer + stream->pos;
dest_end = stream->w_buffer + stream->buffer_size;
src = data;
src_end = data + size;
/* @UNSAFE: add missing CRs */
if (*src == '\n') {
if (!cstream->last_cr && dest < dest_end)
*dest++ = '\r';
if (dest < dest_end) {
*dest++ = '\n';
src++;
}
}
while (dest < dest_end) {
i_assert(src <= src_end);
ptr = memchr(src, '\n', src_end - src);
if (ptr == NULL)
ptr = src_end;
/* copy data up to LF */
copy_len = ptr - src;
if (dest + copy_len > dest_end)
copy_len = dest_end - dest;
if (copy_len > 0) {
memcpy(dest, src, copy_len);
dest += copy_len;
src += copy_len;
}
i_assert(dest <= dest_end && src <= src_end);
if (dest == dest_end || src == src_end)
break;
/* add the CR if necessary and copy the LF.
(src >= data+1, because data[0]=='\n' was
handled before this loop) */
if (src[-1] != '\r')
*dest++ = '\r';
if (dest == dest_end)
break;
*dest++ = '\n';
src++;
i_assert(src == ptr + 1);
}
i_assert(dest != stream->w_buffer);
cstream->last_cr = dest[-1] == '\r';
i_stream_skip(stream->parent, src - data);
ret = (dest - stream->w_buffer) - stream->pos;
i_assert(ret > 0);
stream->pos = dest - stream->w_buffer;
return ret;
}
static ssize_t i_stream_crlf_read_lf(struct istream_private *stream)
{
struct crlf_istream *cstream =
container_of(stream, struct crlf_istream, istream);
const unsigned char *data, *p;
size_t i, dest, size, max;
ssize_t ret;
bool pending_cr;
ret = i_stream_crlf_read_common(cstream);
if (ret <= 0)
return ret;
data = i_stream_get_data(stream->parent, &size);
/* @UNSAFE */
/* \r\n -> \n
\r<anything> -> \r<anything>
\r\r\n -> \r\n */
dest = stream->pos;
pending_cr = cstream->pending_cr;
for (i = 0; i < size && dest < stream->buffer_size; ) {
if (data[i] == '\r') {
if (pending_cr) {
/* \r\r */
stream->w_buffer[dest++] = '\r';
} else {
pending_cr = TRUE;
}
i++;
} else if (data[i] == '\n') {
/* [\r]\n */
pending_cr = FALSE;
stream->w_buffer[dest++] = '\n';
i++;
} else if (pending_cr) {
/* \r<anything> */
pending_cr = FALSE;
stream->w_buffer[dest++] = '\r';
} else {
/* copy everything until the next \r */
max = I_MIN(size - i, stream->buffer_size - dest);
p = memchr(data + i, '\r', max);
if (p != NULL)
max = p - (data+i);
memcpy(stream->w_buffer + dest, data + i, max);
dest += max;
i += max;
}
}
i_assert(i <= size);
i_assert(dest <= stream->buffer_size);
cstream->pending_cr = pending_cr;
i_stream_skip(stream->parent, i);
ret = dest - stream->pos;
if (ret == 0) {
i_assert(cstream->pending_cr && size == 1);
return i_stream_crlf_read_lf(stream);
}
i_assert(ret > 0);
stream->pos = dest;
return ret;
}
static struct istream *
i_stream_create_crlf_full(struct istream *input, bool crlf)
{
struct crlf_istream *cstream;
cstream = i_new(struct crlf_istream, 1);
cstream->istream.max_buffer_size = input->real_stream->max_buffer_size;
cstream->istream.read = crlf ? i_stream_crlf_read_crlf :
i_stream_crlf_read_lf;
cstream->istream.istream.readable_fd = FALSE;
cstream->istream.istream.blocking = input->blocking;
cstream->istream.istream.seekable = FALSE;
return i_stream_create(&cstream->istream, input,
i_stream_get_fd(input), 0);
}
struct istream *i_stream_create_crlf(struct istream *input)
{
return i_stream_create_crlf_full(input, TRUE);
}
struct istream *i_stream_create_lf(struct istream *input)
{
return i_stream_create_crlf_full(input, FALSE);
}
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