270 lines
6.2 KiB
C
270 lines
6.2 KiB
C
/*
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* blob - library for generating/parsing tagged binary data
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*
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* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _BLOB_H__
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#define _BLOB_H__
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#if defined(__linux__) || defined(__CYGWIN__)
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#include <byteswap.h>
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#include <endian.h>
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#elif defined(__APPLE__)
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#include <machine/endian.h>
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#include <machine/byte_order.h>
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#define bswap_16(x) OSSwapInt16(x)
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#define bswap_32(x) OSSwapInt32(x)
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#define bswap_64(x) OSSwapInt64(x)
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#elif defined(__FreeBSD__)
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#include <sys/endian.h>
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#define bswap_16(x) bswap16(x)
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#define bswap_32(x) bswap32(x)
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#define bswap_64(x) bswap64(x)
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#else
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#include <machine/endian.h>
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#define bswap_16(x) swap16(x)
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#define bswap_32(x) swap32(x)
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#define bswap_64(x) swap64(x)
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#endif
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#ifndef __BYTE_ORDER
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#define __BYTE_ORDER BYTE_ORDER
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#endif
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#ifndef __BIG_ENDIAN
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#define __BIG_ENDIAN BIG_ENDIAN
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#endif
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#ifndef __LITTLE_ENDIAN
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#define __LITTLE_ENDIAN LITTLE_ENDIAN
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#endif
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#define cpu_to_be64(x) bswap_64(x)
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#define cpu_to_be32(x) bswap_32(x)
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#define cpu_to_be16(x) bswap_16(x)
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#define be64_to_cpu(x) bswap_64(x)
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#define be32_to_cpu(x) bswap_32(x)
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#define be16_to_cpu(x) bswap_16(x)
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#else
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#define cpu_to_be64(x) (x)
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#define cpu_to_be32(x) (x)
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#define cpu_to_be16(x) (x)
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#define be64_to_cpu(x) (x)
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#define be32_to_cpu(x) (x)
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#define be16_to_cpu(x) (x)
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#endif
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enum {
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BLOB_ATTR_UNSPEC,
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BLOB_ATTR_NESTED,
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BLOB_ATTR_BINARY,
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BLOB_ATTR_STRING,
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BLOB_ATTR_INT8,
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BLOB_ATTR_INT16,
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BLOB_ATTR_INT32,
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BLOB_ATTR_INT64,
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BLOB_ATTR_LAST
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};
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#define BLOB_ATTR_ID_MASK 0xff000000
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#define BLOB_ATTR_ID_SHIFT 24
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#define BLOB_ATTR_LEN_MASK 0x00ffffff
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#define BLOB_ATTR_ALIGN 4
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#ifndef __packed
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#define __packed __attribute__((packed))
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#endif
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struct blob_attr {
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uint32_t id_len;
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char data[];
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} __packed;
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struct blob_attr_info {
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unsigned int type;
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unsigned int minlen;
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unsigned int maxlen;
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bool (*validate)(const struct blob_attr_info *, struct blob_attr *);
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};
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struct blob_buf {
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struct blob_attr *head;
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bool (*grow)(struct blob_buf *buf, int minlen);
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int buflen;
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void *buf;
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};
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/*
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* blob_data: returns the data pointer for an attribute
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*/
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static inline void *
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blob_data(struct blob_attr *attr)
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{
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return attr->data;
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}
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/*
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* blob_id: returns the id of an attribute
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*/
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static inline unsigned int
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blob_id(struct blob_attr *attr)
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{
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int id = (be32_to_cpu(attr->id_len) & BLOB_ATTR_ID_MASK) >> BLOB_ATTR_ID_SHIFT;
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return id;
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}
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/*
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* blob_len: returns the length of the attribute's payload
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*/
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static inline unsigned int
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blob_len(const struct blob_attr *attr)
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{
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return (be32_to_cpu(attr->id_len) & BLOB_ATTR_LEN_MASK) - sizeof(struct blob_attr);
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}
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/*
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* blob_pad_len: returns the complete length of an attribute (including the header)
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*/
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static inline unsigned int
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blob_raw_len(struct blob_attr *attr)
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{
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return blob_len(attr) + sizeof(struct blob_attr);
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}
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/*
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* blob_pad_len: returns the padded length of an attribute (including the header)
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*/
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static inline unsigned int
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blob_pad_len(struct blob_attr *attr)
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{
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int len = blob_raw_len(attr);
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len = (len + BLOB_ATTR_ALIGN - 1) & ~(BLOB_ATTR_ALIGN - 1);
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return len;
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}
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static inline void
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blob_set_raw_len(struct blob_attr *attr, unsigned int len)
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{
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int id = blob_id(attr);
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len &= BLOB_ATTR_LEN_MASK;
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len |= (id << BLOB_ATTR_ID_SHIFT) & BLOB_ATTR_ID_MASK;
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attr->id_len = cpu_to_be32(len);
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}
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static inline uint8_t
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blob_get_int8(struct blob_attr *attr)
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{
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return *((uint8_t *) attr->data);
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}
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static inline uint16_t
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blob_get_int16(struct blob_attr *attr)
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{
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uint16_t *tmp = (uint16_t*)attr->data;
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return be16_to_cpu(*tmp);
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}
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static inline uint32_t
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blob_get_int32(struct blob_attr *attr)
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{
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uint32_t *tmp = (uint32_t*)attr->data;
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return be32_to_cpu(*tmp);
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}
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static inline uint64_t
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blob_get_int64(struct blob_attr *attr)
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{
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uint64_t *tmp = (uint64_t*)attr->data;
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return be64_to_cpu(*tmp);
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}
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static inline const char *
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blob_get_string(struct blob_attr *attr)
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{
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return attr->data;
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}
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static inline struct blob_attr *
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blob_next(struct blob_attr *attr)
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{
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return (struct blob_attr *) ((char *) attr + blob_pad_len(attr));
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}
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extern int blob_buf_init(struct blob_buf *buf, int id);
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extern struct blob_attr *blob_new(struct blob_buf *buf, int id, int payload);
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extern void *blob_nest_start(struct blob_buf *buf, int id);
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extern void blob_nest_end(struct blob_buf *buf, void *cookie);
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extern struct blob_attr *blob_put(struct blob_buf *buf, int id, const void *ptr, int len);
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extern int blob_parse(struct blob_attr *attr, struct blob_attr **data, const struct blob_attr_info *info, int max);
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static inline struct blob_attr *
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blob_put_string(struct blob_buf *buf, int id, const char *str)
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{
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return blob_put(buf, id, str, strlen(str) + 1);
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}
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static inline struct blob_attr *
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blob_put_int8(struct blob_buf *buf, int id, uint8_t val)
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{
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return blob_put(buf, id, &val, sizeof(val));
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}
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static inline struct blob_attr *
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blob_put_int16(struct blob_buf *buf, int id, uint16_t val)
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{
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val = cpu_to_be16(val);
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return blob_put(buf, id, &val, sizeof(val));
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}
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static inline struct blob_attr *
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blob_put_int32(struct blob_buf *buf, int id, uint32_t val)
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{
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val = cpu_to_be32(val);
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return blob_put(buf, id, &val, sizeof(val));
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}
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static inline struct blob_attr *
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blob_put_int64(struct blob_buf *buf, int id, uint64_t val)
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{
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val = cpu_to_be64(val);
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return blob_put(buf, id, &val, sizeof(val));
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}
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#define __blob_for_each_attr(pos, attr, rem) \
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for (pos = (void *) attr; \
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(blob_pad_len(pos) <= rem) && \
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(blob_pad_len(pos) >= sizeof(struct blob_attr)); \
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rem -= blob_pad_len(pos), pos = blob_next(pos))
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#define blob_for_each_attr(pos, attr, rem) \
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for (rem = blob_len(attr), pos = blob_data(attr); \
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(blob_pad_len(pos) <= rem) && \
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(blob_pad_len(pos) >= sizeof(struct blob_attr)); \
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rem -= blob_pad_len(pos), pos = blob_next(pos))
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#endif
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