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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* istream_skip.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "sqfs/io.h"
#include "util/test.h"
#include "io/mem.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 rd_buffer[941];
static sqfs_u8 byte_at_offset(sqfs_u64 off)
{
if (off < end0)
return 'A';
if (off < end1)
return 'B';
return 'C';
}
static void init_rd_buffer(void)
{
for (size_t i = 0; i < end2; ++i)
rd_buffer[i] = byte_at_offset(i);
}
int main(int argc, char **argv)
{
sqfs_u8 read_buffer[61];
sqfs_u64 read_off = 0;
sqfs_istream_t *dummy;
(void)argc; (void)argv;
init_rd_buffer();
dummy = istream_memory_create("dummy file", 103,
rd_buffer, sizeof(rd_buffer));
TEST_NOT_NULL(dummy);
/* region 1 */
while (read_off < end0) {
size_t read_diff = end0 - read_off;
if (read_diff > sizeof(read_buffer))
read_diff = sizeof(read_buffer);
int ret = sqfs_istream_read(dummy, read_buffer, read_diff);
TEST_ASSERT(ret > 0);
TEST_ASSERT((size_t)ret <= read_diff);
for (int i = 0; i < ret; ++i) {
TEST_EQUAL_UI(read_buffer[i], 'A');
}
read_off += ret;
}
/* region 2 */
{
int ret = sqfs_istream_skip(dummy, end2 - end1);
TEST_EQUAL_I(ret, 0);
read_off += (end2 - end1);
}
/* region 3 */
for (;;) {
size_t read_diff = sizeof(read_buffer);
int ret = sqfs_istream_read(dummy, read_buffer, read_diff);
TEST_ASSERT(ret >= 0);
TEST_ASSERT((size_t)ret <= read_diff);
if (ret == 0) {
TEST_EQUAL_UI(read_off, end2);
break;
}
for (int i = 0; i < ret; ++i) {
TEST_EQUAL_UI(read_buffer[i], 'C');
}
read_off += ret;
TEST_ASSERT(read_off <= end2);
}
sqfs_drop(dummy);
return EXIT_SUCCESS;
}
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