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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* istream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/io.h"
#include <string.h>
sqfs_s32 sqfs_istream_read(sqfs_istream_t *strm, void *data, size_t size)
{
sqfs_s32 total = 0;
if (size > 0x7FFFFFFF)
size = 0x7FFFFFFF;
while (size > 0) {
const sqfs_u8 *ptr;
size_t diff;
int ret;
ret = strm->get_buffered_data(strm, &ptr, &diff, size);
if (ret > 0)
break;
if (ret < 0)
return ret;
if (diff > size)
diff = size;
memcpy(data, ptr, diff);
strm->advance_buffer(strm, diff);
data = (char *)data + diff;
size -= diff;
total += diff;
}
return total;
}
int sqfs_istream_skip(sqfs_istream_t *strm, sqfs_u64 size)
{
while (size > 0) {
const sqfs_u8 *ptr;
size_t diff;
int ret;
ret = strm->get_buffered_data(strm, &ptr, &diff, size);
if (ret < 0)
return ret;
if (ret > 0)
break;
if ((sqfs_u64)diff > size)
diff = size;
size -= diff;
strm->advance_buffer(strm, diff);
}
return 0;
}
sqfs_s32 sqfs_istream_splice(sqfs_istream_t *in, sqfs_ostream_t *out,
sqfs_u32 size)
{
sqfs_s32 total = 0;
if (size > 0x7FFFFFFF)
size = 0x7FFFFFFF;
while (size > 0) {
const sqfs_u8 *ptr;
size_t diff;
int ret;
ret = in->get_buffered_data(in, &ptr, &diff, size);
if (ret < 0)
return ret;
if (ret > 0)
break;
if (diff > size)
diff = size;
ret = out->append(out, ptr, diff);
if (ret)
return ret;
total += diff;
size -= diff;
in->advance_buffer(in, diff);
}
return total;
}
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