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/**
* Licensed to the University Corporation for Advanced Internet
* Development, Inc. (UCAID) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*
* UCAID licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the
* License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific
* language governing permissions and limitations under the License.
*/
/**
* @file saml/saml2/binding/SAML2Redirect.h
*
* SAML 2.0 HTTP Redirect compression functionality.
*/
#include "internal.h"
#include "saml2/binding/SAML2Redirect.h"
#include <zlib.h>
#include <xmltooling/logging.h>
#include <xmltooling/util/NDC.h>
using namespace xmltooling::logging;
using namespace std;
namespace {
extern "C" {
voidpf saml_zalloc(void* opaque, uInt items, uInt size)
{
return malloc(items*size);
}
void saml_zfree(void* opaque, voidpf addr)
{
free(addr);
}
};
};
char* opensaml::saml2p::deflate(char* in, unsigned int in_len, unsigned int* out_len)
{
#ifdef _DEBUG
xmltooling::NDC ndc("deflate");
#endif
Category& log = Category::getInstance(SAML_LOGCAT".MessageDecoder.SAML2Redirect.zlib");
z_stream z;
memset(&z, 0, sizeof(z_stream));
z.zalloc = saml_zalloc;
z.zfree = saml_zfree;
z.opaque = nullptr;
z.next_in = (Bytef*)in;
z.avail_in = in_len;
*out_len = 0;
int ret = deflateInit2(&z, 9, Z_DEFLATED, -15, 9, Z_DEFAULT_STRATEGY);
if (ret != Z_OK) {
log.error("zlib deflateInit2 failed with error code (%d)", ret);
return nullptr;
}
int dlen = in_len + (in_len >> 8) + 12; /* orig_size * 1.001 + 12 */
char* out = new char[dlen];
z.next_out = (Bytef*)out;
z.avail_out = dlen;
ret = deflate(&z, Z_FINISH);
if (ret != Z_STREAM_END) {
deflateEnd(&z);
log.error("zlib deflateInit2 failed with error code (%d)", ret);
delete[] out;
}
*out_len = z.total_out;
deflateEnd(&z);
return out;
}
unsigned int opensaml::saml2p::inflate(char* in, unsigned int in_len, ostream& out)
{
#ifdef _DEBUG
xmltooling::NDC ndc("inflate");
#endif
Category& log = Category::getInstance(SAML_LOGCAT".MessageDecoder.SAML2Redirect.zlib");
z_stream z;
memset(&z, 0, sizeof(z_stream));
z.zalloc = saml_zalloc;
z.zfree = saml_zfree;
z.opaque = nullptr;
z.next_in = (Bytef*)in;
z.avail_in = in_len;
int dlen = in_len << 3; /* guess inflated size: orig_size * 8 */
Byte* buf = new Byte[dlen];
memset(buf, 0, dlen);
z.next_out = buf;
z.avail_out = dlen;
int ret = inflateInit2(&z, -15);
if (ret != Z_OK) {
log.error("zlib inflateInit2 failed with error code (%d)", ret);
delete[] buf;
return 0;
}
size_t diff;
int iter = 30;
while (--iter) { /* Make sure we can never be caught in infinite loop */
ret = inflate(&z, Z_SYNC_FLUSH);
switch (ret) {
case Z_STREAM_END:
diff = z.next_out - buf;
z.next_out = buf;
while (diff--)
out << *(z.next_out++);
goto done;
case Z_OK: /* avail_out should be 0 now. Time to dump the buffer. */
diff = z.next_out - buf;
z.next_out = buf;
while (diff--)
out << *(z.next_out++);
memset(buf, 0, dlen);
z.next_out = buf;
z.avail_out = dlen;
break;
default:
delete[] buf;
inflateEnd(&z);
log.error("zlib inflate failed with error code (%d)", ret);
return 0;
}
}
done:
delete[] buf;
int out_len = z.total_out;
inflateEnd(&z);
return out_len;
}
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