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EvBufferWriter.c
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EvBufferWriter.c
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/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "io/EvBufferWriter.h"
#include <event2/buffer.h>
#include <string.h>
struct Context {
struct evbuffer* buffer;
size_t amount;
int returnCode;
struct Writer writer;
};
static int write(const void* toWrite, size_t length, const struct Writer* writer);
static uint64_t bytesWritten(const struct Writer* writer);
/** @see EvBufferWriter.h */
struct Writer* EvBufferWriter_new(struct evbuffer* buffer, const struct Allocator* allocator)
{
struct Context* context = allocator->calloc(sizeof(struct Context), 1, allocator);
context->amount = 0;
context->returnCode = 0;
context->buffer = buffer;
struct Writer localWriter = {
.context = context,
.write = write,
.bytesWritten = bytesWritten
};
memcpy(&context->writer, &localWriter, sizeof(struct Writer));
return &context->writer;
}
/** @see Writer->write() */
static int write(const void* toWrite, size_t length, const struct Writer* writer)
{
struct Context* context = (struct Context*) writer->context;
// If there was a previous failure then don't allow any more writing.
if (context->returnCode) {
return context->returnCode;
}
context->returnCode = evbuffer_add(context->buffer, toWrite, length);
if (!context->returnCode) {
context->amount += length;
}
return context->returnCode;
}
static uint64_t bytesWritten(const struct Writer* writer)
{
return ((struct Context*) writer->context)->amount;
}