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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* istream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "internal.h"
sqfs_s32 istream_read(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 = istream_get_buffered_data(strm, &ptr, &diff);
if (ret > 0)
break;
if (ret < 0)
return ret;
if (diff > size)
diff = size;
memcpy(data, ptr, diff);
data = (char *)data + diff;
size -= diff;
total += diff;
ret = istream_advance_buffer(strm, diff);
if (ret)
return -1;
}
return total;
}
int istream_skip(istream_t *strm, sqfs_u64 size)
{
while (size > 0) {
const sqfs_u8 *ptr;
size_t diff;
int ret;
ret = istream_get_buffered_data(strm, &ptr, &diff);
if (ret < 0)
return ret;
if (ret > 0) {
fprintf(stderr, "%s: unexpected end-of-file\n",
strm->get_filename(strm));
return -1;
}
if ((sqfs_u64)diff > size)
diff = size;
size -= diff;
if (istream_advance_buffer(strm, diff))
return -1;
}
return 0;
}
sqfs_s32 istream_splice(istream_t *in, 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 = istream_get_buffered_data(in, &ptr, &diff);
if (ret < 0)
return ret;
if (ret > 0)
break;
if (diff > size)
diff = size;
if (ostream_append(out, ptr, diff))
return -1;
if (istream_advance_buffer(in, diff))
return -1;
total += diff;
size -= diff;
}
return total;
}
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