kfile_fifo.c

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00001 
00038 #include "kfile_fifo.h"
00039 #include "fifobuf.h"
00040 
00041 #include <io/kfile.h>
00042 
00043 #include <string.h>
00044 
00045 static size_t kfilefifo_read(struct KFile *_fd, void *_buf, size_t size)
00046 {
00047     KFileFifo *fd = KFILEFIFO_CAST(_fd);
00048     uint8_t *buf = (uint8_t *)_buf;
00049 
00050     while (size-- && !fifo_isempty_locked(fd->fifo))
00051         *buf++ = fifo_pop_locked(fd->fifo);
00052 
00053     return buf - (uint8_t *)_buf;
00054 }
00055 
00056 static size_t kfilefifo_write(struct KFile *_fd, const void *_buf, size_t size)
00057 {
00058     KFileFifo *fd = KFILEFIFO_CAST(_fd);
00059     const uint8_t *buf = (const uint8_t *)_buf;
00060 
00061     while (size-- && !fifo_isfull_locked(fd->fifo))
00062         fifo_push_locked(fd->fifo, *buf++);
00063 
00064     return buf - (const uint8_t *)_buf;
00065 }
00066 
00067 void kfilefifo_init(KFileFifo *kf, FIFOBuffer *fifo)
00068 {
00069     memset(kf, 0, sizeof(*kf));
00070 
00071     kf->fifo = fifo;
00072     kf->fd.read = kfilefifo_read;
00073     kf->fd.write = kfilefifo_write;
00074     DB(kf->fd._type = KFT_KFILEFIFO);
00075 }