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/* Copyright (c) 2007-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "memarea.h"
#include "istream-private.h"
#include "test-common.h"
struct test_istream {
struct istream_private istream;
const void *orig_buffer;
unsigned int skip_diff;
size_t max_pos;
bool allow_eof;
};
static void test_buffer_free(unsigned char *buf)
{
i_free(buf);
}
static ssize_t test_read(struct istream_private *stream)
{
struct test_istream *tstream = (struct test_istream *)stream;
unsigned int new_skip_diff;
size_t cur_max;
ssize_t ret;
i_assert(stream->skip <= stream->pos);
if (stream->pos - stream->skip >= tstream->istream.max_buffer_size) {
i_assert(stream->skip != stream->pos);
return -2;
}
if (tstream->max_pos < stream->pos) {
/* we seeked past the end of file. */
ret = 0;
} else {
/* copy data to a buffer in somewhat random place. this could
help catch bugs. */
new_skip_diff = i_rand_limit(128);
stream->skip = (stream->skip - tstream->skip_diff) +
new_skip_diff;
stream->pos = (stream->pos - tstream->skip_diff) +
new_skip_diff;
tstream->max_pos = (tstream->max_pos - tstream->skip_diff) +
new_skip_diff;
tstream->skip_diff = new_skip_diff;
cur_max = tstream->max_pos;
if (stream->max_buffer_size < SIZE_MAX - stream->skip &&
cur_max > stream->skip + stream->max_buffer_size)
cur_max = stream->skip + stream->max_buffer_size;
/* Reallocate the memory area if needed. Use exactly correct
buffer size so valgrind can catch read overflows. If a
correctly sized memarea already exists, use it only if
its refcount is 1. Otherwise with refcount>1 we could be
moving data within an existing memarea, which breaks
snapshots. */
if (cur_max > 0 && (stream->buffer_size != cur_max ||
stream->memarea == NULL ||
memarea_get_refcount(stream->memarea) > 1)) {
void *old_w_buffer = stream->w_buffer;
stream->w_buffer = i_malloc(cur_max);
if (stream->buffer_size != 0) {
memcpy(stream->w_buffer, old_w_buffer,
I_MIN(stream->buffer_size, cur_max));
}
stream->buffer = stream->w_buffer;
stream->buffer_size = cur_max;
if (stream->memarea != NULL)
memarea_unref(&stream->memarea);
stream->memarea = memarea_init(stream->w_buffer,
stream->buffer_size,
test_buffer_free,
stream->w_buffer);
}
ssize_t size = cur_max - new_skip_diff;
if (size > 0)
memcpy(stream->w_buffer + new_skip_diff,
tstream->orig_buffer, (size_t)size);
ret = cur_max - stream->pos;
stream->pos = cur_max;
}
if (ret > 0)
return ret;
else if (!tstream->allow_eof ||
stream->pos - tstream->skip_diff < (uoff_t)stream->statbuf.st_size)
return 0;
else {
stream->istream.eof = TRUE;
return -1;
}
}
static void test_seek(struct istream_private *stream, uoff_t v_offset,
bool mark ATTR_UNUSED)
{
struct test_istream *tstream = (struct test_istream *)stream;
stream->istream.v_offset = v_offset;
stream->skip = v_offset + tstream->skip_diff;
stream->pos = stream->skip;
}
struct istream *test_istream_create_data(const void *data, size_t size)
{
struct test_istream *tstream;
tstream = i_new(struct test_istream, 1);
tstream->orig_buffer = data;
tstream->istream.read = test_read;
tstream->istream.seek = test_seek;
tstream->istream.istream.blocking = FALSE;
tstream->istream.istream.seekable = TRUE;
i_stream_create(&tstream->istream, NULL, -1, 0);
tstream->istream.statbuf.st_size = tstream->max_pos = size;
tstream->allow_eof = TRUE;
tstream->istream.max_buffer_size = SIZE_MAX;
return &tstream->istream.istream;
}
struct istream *test_istream_create(const char *data)
{
return test_istream_create_data(data, strlen(data));
}
static struct test_istream *test_istream_find(struct istream *input)
{
struct istream *in;
for (in = input; in != NULL; in = in->real_stream->parent) {
if (in->real_stream->read == test_read)
return (struct test_istream *)in->real_stream;
}
i_panic("%s isn't test-istream", i_stream_get_name(input));
}
void test_istream_set_allow_eof(struct istream *input, bool allow)
{
struct test_istream *tstream = test_istream_find(input);
tstream->allow_eof = allow;
}
void test_istream_set_max_buffer_size(struct istream *input, size_t size)
{
struct test_istream *tstream = test_istream_find(input);
tstream->istream.max_buffer_size = size;
}
void test_istream_set_size(struct istream *input, uoff_t size)
{
struct test_istream *tstream = test_istream_find(input);
if (size > (uoff_t)tstream->istream.statbuf.st_size)
size = (uoff_t)tstream->istream.statbuf.st_size;
tstream->max_pos = size + tstream->skip_diff;
}
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