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/* vim: set expandtab ts=4 sw=4: */
/*
* 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 "ArrayWriter.h"
#include "util/Bits.h"
struct ArrayWriter_context {
char* beginPointer;
char* pointer;
char* endPointer;
int returnCode;
};
static int write(const void* toWrite, size_t length, const struct Writer* writer);
static uint64_t bytesWritten(const struct Writer* writer);
/** @see ArrayWriter.h */
struct Writer* ArrayWriter_new(void* writeToBuffer,
size_t length,
const struct Allocator* allocator)
{
struct Writer* writer =
allocator->calloc(sizeof(struct Writer), 1, allocator);
struct ArrayWriter_context* context =
allocator->calloc(sizeof(struct ArrayWriter_context), 1, allocator);
if (context == NULL || writer == NULL) {
return NULL;
}
context->beginPointer = (char*) writeToBuffer;
context->pointer = (char*) writeToBuffer;
context->endPointer = (char*) writeToBuffer + length;
struct Writer localWriter = {
.context = context,
.write = write,
.bytesWritten = bytesWritten
};
Bits_memcpyConst(writer, &localWriter, sizeof(struct Writer));
return writer;
}
/** @see Writer->write() */
static int write(const void* toWrite, size_t length, const struct Writer* writer)
{
struct ArrayWriter_context* context =
(struct ArrayWriter_context*) writer->context;
/* If there was a previous failure then don't allow any more writing. */
if (context->returnCode != 0) {
return context->returnCode;
}
/* Prove that it doesn't run off the end of the buffer or roll over. */
if (context->pointer + length >= context->endPointer
|| context->pointer + length < context->pointer)
{
context->returnCode = -1;
return -1;
}
Bits_memcpy(context->pointer, toWrite, length);
context->pointer += length;
return 0;
}
static uint64_t bytesWritten(const struct Writer* writer)
{
struct ArrayWriter_context* context =
(struct ArrayWriter_context*) writer->context;
return context->pointer - context->beginPointer;
}
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