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Added SDL_PeekIntoDataQueue().

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This commit is contained in:
Ryan C. Gordon 2017-10-10 11:56:54 -04:00
parent d90fce3c9e
commit 28149e11c8
2 changed files with 26 additions and 0 deletions
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25
src/SDL_dataqueue.c
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@ -225,6 +225,31 @@ SDL_WriteToDataQueue(SDL_DataQueue *queue, const void *_data, const size_t _len)
return 0;
}
size_t
SDL_PeekIntoDataQueue(SDL_DataQueue *queue, void *_buf, const size_t _len)
{
size_t len = _len;
Uint8 *buf = (Uint8 *) _buf;
Uint8 *ptr = buf;
SDL_DataQueuePacket *packet;
if (!queue) {
return 0;
}
for (packet = queue->head; len && packet; packet = packet->next) {
const size_t avail = packet->datalen - packet->startpos;
const size_t cpy = SDL_min(len, avail);
SDL_assert(queue->queued_bytes >= avail);
SDL_memcpy(ptr, packet->data + packet->startpos, cpy);
ptr += cpy;
len -= cpy;
}
return (size_t) (ptr - buf);
}
size_t
SDL_ReadFromDataQueue(SDL_DataQueue *queue, void *_buf, const size_t _len)
{

1
src/SDL_dataqueue.h
View File

@ -31,6 +31,7 @@ void SDL_FreeDataQueue(SDL_DataQueue *queue);
void SDL_ClearDataQueue(SDL_DataQueue *queue, const size_t slack);
int SDL_WriteToDataQueue(SDL_DataQueue *queue, const void *data, const size_t len);
size_t SDL_ReadFromDataQueue(SDL_DataQueue *queue, void *buf, const size_t len);
size_t SDL_PeekIntoDataQueue(SDL_DataQueue *queue, void *buf, const size_t len);
size_t SDL_CountDataQueue(SDL_DataQueue *queue);
/* this sets a section of the data queue aside (possibly allocating memory for it)