52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/*
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** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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** Distributed under the terms of the NewOS License.
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*/
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#ifndef _KERNEL_CBUF_H
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#define _KERNEL_CBUF_H
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#include <kernel.h>
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#define CBUF_LEN 2048
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#define CBUF_FLAG_CHAIN_HEAD 1
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#define CBUF_FLAG_CHAIN_TAIL 2
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typedef struct cbuf {
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struct cbuf *next;
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size_t len;
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size_t total_len;
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void *data;
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int flags;
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char dat[CBUF_LEN - sizeof(struct cbuf *) - 2*sizeof(int) - sizeof(void *) - sizeof(int)];
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} cbuf;
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int cbuf_init(void);
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cbuf *cbuf_get_chain(size_t len);
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cbuf *cbuf_get_chain_noblock(size_t len);
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void cbuf_free_chain_noblock(cbuf *buf);
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void cbuf_free_chain(cbuf *buf);
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size_t cbuf_get_len(cbuf *buf);
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void *cbuf_get_ptr(cbuf *buf, size_t offset);
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int cbuf_is_contig_region(cbuf *buf, size_t start, size_t end);
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int cbuf_memcpy_to_chain(cbuf *chain, size_t offset, const void *_src, size_t len);
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int cbuf_memcpy_from_chain(void *dest, cbuf *chain, size_t offset, size_t len);
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int cbuf_user_memcpy_to_chain(cbuf *chain, size_t offset, const void *_src, size_t len);
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int cbuf_user_memcpy_from_chain(void *dest, cbuf *chain, size_t offset, size_t len);
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uint16 cbuf_ones_cksum16(cbuf *chain, size_t offset, size_t len);
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cbuf *cbuf_merge_chains(cbuf *chain1, cbuf *chain2);
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cbuf *cbuf_duplicate_chain(cbuf *chain, size_t offset, size_t len);
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int cbuf_truncate_head(cbuf *chain, size_t trunc_bytes);
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int cbuf_truncate_tail(cbuf *chain, size_t trunc_bytes);
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void cbuf_test(void);
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#endif
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