Nils O. Selåsdal
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
#ifndef UC_MBUF_H_
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#define UC_MBUF_H_
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#include <stdint.h>
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#include <stddef.h>
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#ifdef __GNUC__
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# define UC_INLINE inline __attribute__((always_inline))
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#else
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# define UC_INLINE inline
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#endif
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enum UC_MBUF_FLAGS {
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UC_MBUF_FL_MALLOC = 0x0001, //MBuf and MBuf->bufstart are seperatly malloc'd
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UC_MBUF_FL_MALLOC_BUF = 0x0001, //MBuf is not malloc'd. MBuf->bufstart is malloc'd
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UC_MBUF_FL_MALLOC_INLINE = 0x0002, //MBuf is one big malloc. Can't be resized
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UC_MBUF_FL_STATIC = 0x0004, //MBuf and MBuf->bustart is user controlled. Can't be resized
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};
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struct MBuf {
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struct MBuf *next;
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uint8_t *p1;
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uint8_t *p2;
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uint8_t *p3;
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uint8_t *p4;
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void *cookie;
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uint32_t flags;
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uint32_t allocated;
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uint8_t *bufstart;
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uint8_t *head;
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uint8_t *tail;
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uint8_t inline_data[0];
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};
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/* Conventions:
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* push - prepend data to the buffer (in the head room part)
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* pull - remove data from the beginning of the message.
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* put - Add data to the buffer.
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*/
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struct MBuf *uc_mbuf_new_hr(uint32_t len, uint32_t headroom);
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#define uc_mbuf_new(len) uc_mbuf_new_hr((len), 0)
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struct MBuf *uc_mbuf_new_inline_hr(uint32_t len, uint32_t headroom);
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#define uc_mbuf_new_inline(len) uc_mbuf_new_inline_hr((len), 0)
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void uc_mbuf_free(struct MBuf *mbuf);
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struct MBuf *uc_mbuf_copy_data(struct MBuf *mbuf);
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void uc_mbuf_init(struct MBuf *mbuf, uint8_t *buf, uint32_t len, uint32_t headroom, uint32_t flags);
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void uc_mbuf_zero(struct MBuf *mbuf);
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void uc_mbuf_reset(struct MBuf *mbuf);
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static UC_INLINE uint32_t uc_mbuf_len(struct MBuf *mbuf)
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{
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return (uint32_t)(mbuf->tail - mbuf->head);
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}
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static UC_INLINE uint32_t uc_mbuf_tailroom(struct MBuf *mbuf)
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{
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return mbuf->allocated - (uint32_t)(mbuf->tail - mbuf->bufstart);
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}
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static inline uint32_t uc_mbuf_headroom(struct MBuf *mbuf)
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{
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return (uint32_t)(mbuf->head - mbuf->bufstart);
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}
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uint8_t *uc_mbuf_put(struct MBuf *mbuf, uint32_t size);
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uint8_t *uc_mbuf_push(struct MBuf *mbuf, uint32_t size);
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uint8_t *uc_mbuf_pull(struct MBuf *mbuf, uint32_t size);
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#undef UC_INLINE
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#endif
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