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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* istream_mem.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "util/test.h"
#include "io/mem.h"
static const size_t end0 = 449; /* region 1: filled with 'A' */
static const size_t end1 = 521; /* region 2: filled with 'B' */
static const size_t end2 = 941; /* region 3: filled with 'C' */
static unsigned char data[941];
static unsigned char byte_at_offset(size_t off)
{
if (off < end0)
return 'A';
if (off < end1)
return 'B';
return 'C';
}
static void init_buffer(void)
{
for (size_t i = 0; i < end2; ++i)
data[i] = byte_at_offset(i);
}
int main(int argc, char **argv)
{
bool eat_all = true;
size_t i, diff;
istream_t *in;
int ret;
(void)argc; (void)argv;
init_buffer();
in = istream_memory_create("memstream.txt", 61, data, sizeof(data));
TEST_NOT_NULL(in);
TEST_EQUAL_UI(((sqfs_object_t *)in)->refcount, 1);
TEST_STR_EQUAL(istream_get_filename(in), "memstream.txt");
TEST_NOT_NULL(in->buffer);
TEST_EQUAL_UI(in->buffer_used, 0);
for (i = 0; i < end2; i += diff) {
ret = istream_precache(in);
TEST_EQUAL_I(ret, 0);
if ((end2 - i) >= 61) {
TEST_NOT_NULL(in->buffer);
TEST_EQUAL_UI(in->buffer_used, 61);
} else {
TEST_NOT_NULL(in->buffer);
TEST_EQUAL_UI(in->buffer_used, (end2 - i));
}
for (size_t j = 0; j < in->buffer_used; ++j) {
TEST_EQUAL_UI(in->buffer[j], byte_at_offset(i + j));
}
diff = eat_all ? in->buffer_used : (in->buffer_used / 2);
eat_all = !eat_all;
in->buffer += diff;
in->buffer_used -= diff;
}
TEST_EQUAL_UI(in->buffer_used, 0);
sqfs_drop(in);
return EXIT_SUCCESS;
}
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