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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is PRIVATE to SSL.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "prnetdb.h"
#include "seccomon.h"
#include "secerr.h"
#include "ssl3encode.h"
SECStatus
ssl3_AppendToItem(SECItem *item, const unsigned char *buf, PRUint32 bytes)
{
if (bytes > item->len) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
PORT_Memcpy(item->data, buf, bytes);
item->data += bytes;
item->len -= bytes;
return SECSuccess;
}
SECStatus
ssl3_AppendNumberToItem(SECItem *item, PRUint32 num, PRInt32 lenSize)
{
SECStatus rv;
PRUint8 b[4];
ssl_EncodeUintX(num, lenSize, b);
rv = ssl3_AppendToItem(item, &b[0], lenSize);
return rv;
}
SECStatus
ssl3_ConsumeFromItem(SECItem *item, unsigned char **buf, PRUint32 bytes)
{
if (bytes > item->len) {
PORT_SetError(SEC_ERROR_BAD_DATA);
return SECFailure;
}
*buf = item->data;
item->data += bytes;
item->len -= bytes;
return SECSuccess;
}
SECStatus
ssl3_ConsumeNumberFromItem(SECItem *item, PRUint32 *num, PRUint32 bytes)
{
int i;
if (bytes > item->len || bytes > sizeof(*num)) {
PORT_SetError(SEC_ERROR_BAD_DATA);
return SECFailure;
}
*num = 0;
for (i = 0; i < bytes; i++) {
*num = (*num << 8) + item->data[i];
}
item->data += bytes;
item->len -= bytes;
return SECSuccess;
}
/* Helper function to encode an unsigned integer into a buffer. */
PRUint8 *
ssl_EncodeUintX(PRUint64 value, unsigned int bytes, PRUint8 *to)
{
PRUint64 encoded;
PORT_Assert(bytes > 0 && bytes <= sizeof(encoded));
encoded = PR_htonll(value);
memcpy(to, ((unsigned char *)(&encoded)) + (sizeof(encoded) - bytes), bytes);
return to + bytes;
}
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