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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* stream_splice.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "io/istream.h"
#include "io/ostream.h"
#include "util/test.h"
static const sqfs_u64 end0 = 449; /* region 1: filled with 'A' */
static const sqfs_u64 end1 = 521; /* region 2: filled with 'B' */
static const sqfs_u64 end2 = 941; /* region 3: filled with 'C' */
static sqfs_u8 byte_at_offset(sqfs_u64 off)
{
if (off < end0)
return 'A';
if (off < end1)
return 'B';
return 'C';
}
/*****************************************************************************/
static int out_append(ostream_t *strm, const void *data, size_t size);
static sqfs_u64 out_offset = 0;
static ostream_t out = {
{ 1, NULL, NULL },
out_append,
NULL,
NULL,
NULL,
};
static int out_append(ostream_t *strm, const void *data, size_t size)
{
const sqfs_u8 *ptr = data;
TEST_ASSERT(strm == &out);
TEST_ASSERT(size > 0);
while (size--) {
sqfs_u8 x = *(ptr++);
sqfs_u8 y = byte_at_offset(out_offset++);
TEST_EQUAL_UI(x, y);
TEST_ASSERT(out_offset <= end2);
}
return 0;
}
/*****************************************************************************/
static int in_precache(istream_t *strm);
static sqfs_u8 in_buffer[109];
static sqfs_u64 in_offset = 0;
static istream_t in = {
{ 1, NULL, NULL },
0,
0,
false,
in_buffer,
in_precache,
NULL,
};
static int in_precache(istream_t *strm)
{
TEST_ASSERT(strm == &in);
while (strm->buffer_used < sizeof(in_buffer)) {
if (in_offset == end2) {
strm->eof = true;
break;
}
in_buffer[strm->buffer_used++] = byte_at_offset(in_offset++);
}
return 0;
}
/*****************************************************************************/
int main(int argc, char **argv)
{
sqfs_u64 total = 0;
sqfs_s32 ret;
(void)argc; (void)argv;
for (;;) {
ret = ostream_append_from_istream(&out, &in, 211);
TEST_ASSERT(ret >= 0);
if (ret == 0)
break;
total += ret;
TEST_ASSERT(total <= end2);
TEST_ASSERT(out_offset <= end2);
TEST_ASSERT(in_offset <= end2);
TEST_ASSERT(in_offset >= out_offset);
TEST_EQUAL_UI(total, out_offset);
}
TEST_EQUAL_UI(total, end2);
TEST_EQUAL_UI(out_offset, end2);
TEST_EQUAL_UI(in_offset, end2);
return EXIT_SUCCESS;
}
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