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/*
This file is part of libmicrohttpd
(C) 2007 Daniel Pittman and Christian Grothoff
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file response.c
* @brief Methods for managing response objects
* @author Daniel Pittman
* @author Christian Grothoff
*/
#include "internal.h"
#include "response.h"
/**
* Add a header line to the response.
*
* @return MHD_NO on error (i.e. invalid header or content format).
*/
int
MHD_add_response_header (struct MHD_Response *response,
const char *header, const char *content)
{
struct MHD_HTTP_Header *hdr;
if ((response == NULL) ||
(header == NULL) ||
(content == NULL) ||
(strlen (header) == 0) ||
(strlen (content) == 0) ||
(NULL != strstr (header, "\t")) ||
(NULL != strstr (header, "\r")) ||
(NULL != strstr (header, "\n")) ||
(NULL != strstr (content, "\t")) ||
(NULL != strstr (content, "\r")) || (NULL != strstr (content, "\n")))
return MHD_NO;
hdr = malloc (sizeof (struct MHD_HTTP_Header));
hdr->header = strdup (header);
hdr->value = strdup (content);
hdr->kind = MHD_HEADER_KIND;
hdr->next = response->first_header;
response->first_header = hdr;
return MHD_YES;
}
/**
* Delete a header line from the response.
*
* @return MHD_NO on error (no such header known)
*/
int
MHD_del_response_header (struct MHD_Response *response,
const char *header, const char *content)
{
struct MHD_HTTP_Header *pos;
struct MHD_HTTP_Header *prev;
if ((header == NULL) || (content == NULL))
return MHD_NO;
prev = NULL;
pos = response->first_header;
while (pos != NULL)
{
if ((0 == strcmp (header, pos->header)) &&
(0 == strcmp (content, pos->value)))
{
free (pos->header);
free (pos->value);
if (prev == NULL)
response->first_header = pos->next;
else
prev->next = pos->next;
free (pos);
return MHD_YES;
}
prev = pos;
pos = pos->next;
}
return MHD_NO;
}
/**
* Get all of the headers added to a response.
*
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to iterator
* @return number of entries iterated over
*/
int
MHD_get_response_headers (struct MHD_Response *response,
MHD_KeyValueIterator iterator, void *iterator_cls)
{
struct MHD_HTTP_Header *pos;
int numHeaders = 0;
pos = response->first_header;
while (pos != NULL)
{
numHeaders++;
if ((iterator != NULL) &&
(MHD_YES != iterator (iterator_cls,
pos->kind, pos->header, pos->value)))
break;
pos = pos->next;
}
return numHeaders;
}
/**
* Get a particular header from the response.
*
* @param key which header to get
* @return NULL if header does not exist
*/
const char *
MHD_get_response_header (struct MHD_Response *response, const char *key)
{
struct MHD_HTTP_Header *pos;
pos = response->first_header;
while (pos != NULL)
{
if (0 == strcmp (key, pos->header))
return pos->value;
pos = pos->next;
}
return NULL;
}
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response, -1 for unknown
* @param block_size preferred block size for querying crc (advisory only,
* MHD may still call crc using smaller chunks); this
* is essentially the buffer size used for IO, clients
* should pick a value that is appropriate for IO and
* memory performance requirements
* @param crc callback to use to obtain response data
* @param crc_cls extra argument to crc
* @param crfc callback to call to free crc_cls resources
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *
MHD_create_response_from_callback (size_t size,
unsigned int block_size,
MHD_ContentReaderCallback crc,
void *crc_cls,
MHD_ContentReaderFreeCallback crfc)
{
struct MHD_Response *retVal;
if ((crc == NULL) || (block_size == 0))
return NULL;
retVal = malloc (sizeof (struct MHD_Response) + block_size);
if (retVal == NULL)
return NULL;
memset (retVal, 0, sizeof (struct MHD_Response));
retVal->data = (void *) &retVal[1];
retVal->data_buffer_size = MHD_BUF_INC_SIZE;
if (pthread_mutex_init (&retVal->mutex, NULL) != 0)
{
free (retVal);
return NULL;
}
retVal->crc = crc;
retVal->crfc = crfc;
retVal->crc_cls = crc_cls;
retVal->reference_count = 1;
retVal->total_size = size;
return retVal;
}
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response
* @param data the data itself
* @param must_free libmicrohttpd should free data when done
* @param must_copy libmicrohttpd must make a copy of data
* right away, the data maybe released anytime after
* this call returns
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *
MHD_create_response_from_data (size_t size,
void *data, int must_free, int must_copy)
{
struct MHD_Response *retVal;
void *tmp;
if ((data == NULL) && (size > 0))
return NULL;
retVal = malloc (sizeof (struct MHD_Response));
memset (retVal, 0, sizeof (struct MHD_Response));
if (pthread_mutex_init (&retVal->mutex, NULL) != 0)
{
free (retVal);
return NULL;
}
if ((must_copy) && (size > 0))
{
tmp = malloc (size);
memcpy (tmp, data, size);
must_free = 1;
data = tmp;
}
retVal->crc = NULL;
retVal->crfc = must_free ? &free : NULL;
retVal->crc_cls = must_free ? data : NULL;
retVal->reference_count = 1;
retVal->total_size = size;
retVal->data = data;
retVal->data_size = size;
return retVal;
}
/**
* Destroy a response object and associated resources. Note that
* libmicrohttpd may keep some of the resources around if the response
* is still in the queue for some clients, so the memory may not
* necessarily be freed immediatley.
*/
void
MHD_destroy_response (struct MHD_Response *response)
{
struct MHD_HTTP_Header *pos;
if (response == NULL)
return;
pthread_mutex_lock (&response->mutex);
if (0 != --response->reference_count)
{
pthread_mutex_unlock (&response->mutex);
return;
}
pthread_mutex_unlock (&response->mutex);
pthread_mutex_destroy (&response->mutex);
if (response->crfc != NULL)
response->crfc (response->crc_cls);
while (response->first_header != NULL)
{
pos = response->first_header;
response->first_header = pos->next;
free (pos->header);
free (pos->value);
free (pos);
}
free (response);
}
void
MHD_increment_response_rc (struct MHD_Response *response)
{
pthread_mutex_lock (&response->mutex);
response->reference_count++;
pthread_mutex_unlock (&response->mutex);
}
/* end of response.c */
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