blob.c File Reference

#include "blob.h"

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Functions
static bool	blob_buffer_grow (struct blob_buf *buf, int minlen)
static void	blob_init (struct blob_attr *attr, int id, unsigned int len)
static struct blob_attr *	offset_to_attr (struct blob_buf *buf, int offset)
static int	attr_to_offset (struct blob_buf *buf, struct blob_attr *attr)
bool	blob_buf_grow (struct blob_buf *buf, int required)
static struct blob_attr *	blob_add (struct blob_buf *buf, struct blob_attr *pos, int id, int payload)
int	blob_buf_init (struct blob_buf *buf, int id)
void	blob_buf_free (struct blob_buf *buf)
void	blob_fill_pad (struct blob_attr *attr)
void	blob_set_raw_len (struct blob_attr *attr, unsigned int len)
struct blob_attr *	blob_new (struct blob_buf *buf, int id, int payload)
struct blob_attr *	blob_put_raw (struct blob_buf *buf, const void *ptr, unsigned int len)
struct blob_attr *	blob_put (struct blob_buf *buf, int id, const void *ptr, unsigned int len)
void *	blob_nest_start (struct blob_buf *buf, int id)
void	blob_nest_end (struct blob_buf *buf, void *cookie)
bool	blob_check_type (const void *ptr, unsigned int len, int type)
static int	blob_parse_attr (struct blob_attr *attr, size_t attr_len, struct blob_attr **data, const struct blob_attr_info *info, int max)
int	blob_parse_untrusted (struct blob_attr *attr, size_t attr_len, struct blob_attr **data, const struct blob_attr_info *info, int max)
int	blob_parse (struct blob_attr *attr, struct blob_attr **data, const struct blob_attr_info *info, int max)
bool	blob_attr_equal (const struct blob_attr *a1, const struct blob_attr *a2)
struct blob_attr *	blob_memdup (struct blob_attr *attr)

Variables
static const size_t	blob_type_minlen [BLOB_ATTR_LAST]

Function Documentation

attr_to_offset()

static int attr_to_offset ( struct blob_buf *  buf, struct blob_attr *  attr  )

inlinestatic

Definition at line 51 of file blob.c.

{
        return (char *)attr - (char *) buf->buf + BLOB_COOKIE;
}

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blob_add()

static struct blob_attr* blob_add ( struct blob_buf *  buf, struct blob_attr *  pos, int  id, int  payload  )

static

Definition at line 71 of file blob.c.

{
        int offset = attr_to_offset(buf, pos);
        int required = (offset - BLOB_COOKIE + sizeof(struct blob_attr) + payload) - buf->buflen;
        struct blob_attr *attr;
 
        if (required > 0) {
                if (!blob_buf_grow(buf, required))
                        return NULL;
                attr = offset_to_attr(buf, offset);
        } else {
                attr = pos;
        }
 
        blob_init(attr, id, payload + sizeof(struct blob_attr));
        blob_fill_pad(attr);
        return attr;
}

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blob_attr_equal()

bool blob_attr_equal	(	const struct blob_attr *	a1,
		const struct blob_attr *	a2
	)

Definition at line 311 of file blob.c.

{
        if (!a1 && !a2)
                return true;
 
        if (!a1 || !a2)
                return false;
 
        if (blob_pad_len(a1) != blob_pad_len(a2))
                return false;
 
        return !memcmp(a1, a2, blob_pad_len(a1));
}

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blob_buf_free()

void blob_buf_free

(

struct blob_buf *

buf

)

Definition at line 104 of file blob.c.

{
        free(buf->buf);
        buf->buf = NULL;
        buf->head = NULL;
        buf->buflen = 0;
}

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blob_buf_grow()

bool blob_buf_grow	(	struct blob_buf *	buf,
		int	required
	)

Definition at line 57 of file blob.c.

{
        int offset_head = attr_to_offset(buf, buf->head);
 
        if ((buf->buflen + required) > BLOB_ATTR_LEN_MASK)
                return false;
        if (!buf->grow || !buf->grow(buf, required))
                return false;
 
        buf->head = offset_to_attr(buf, offset_head);
        return true;
}

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blob_buf_init()

int blob_buf_init	(	struct blob_buf *	buf,
		int	id
	)

Definition at line 91 of file blob.c.

{
        if (!buf->grow)
                buf->grow = blob_buffer_grow;
 
        buf->head = buf->buf;
        if (blob_add(buf, buf->buf, id, 0) == NULL)
                return -ENOMEM;
 
        return 0;
}

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blob_buffer_grow()

static bool blob_buffer_grow ( struct blob_buf *  buf, int  minlen  )

static

Definition at line 22 of file blob.c.

{
        struct blob_buf *new;
        int delta = ((minlen / 256) + 1) * 256;
        new = realloc(buf->buf, buf->buflen + delta);
        if (new) {
                buf->buf = new;
                memset(buf->buf + buf->buflen, 0, delta);
                buf->buflen += delta;
        }
        return !!new;
}

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blob_check_type()

bool blob_check_type	(	const void *	ptr,
		unsigned int	len,
		int	type
	)

Definition at line 202 of file blob.c.

{
        const char *data = ptr;
 
        if (type >= BLOB_ATTR_LAST)
                return false;
 
        if (type >= BLOB_ATTR_INT8 && type <= BLOB_ATTR_INT64) {
                if (len != blob_type_minlen[type])
                        return false;
        } else {
                if (len < blob_type_minlen[type])
                        return false;
        }
 
        if (type == BLOB_ATTR_STRING && data[len - 1] != 0)
                return false;
 
        return true;
}

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blob_fill_pad()

void blob_fill_pad

(

struct blob_attr *

attr

)

Definition at line 113 of file blob.c.

{
        char *buf = (char *) attr;
        int len = blob_pad_len(attr);
        int delta = len - blob_raw_len(attr);
 
        if (delta > 0)
                memset(buf + len - delta, 0, delta);
}

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blob_init()

static void blob_init ( struct blob_attr *  attr, int  id, unsigned int  len  )

static

Definition at line 36 of file blob.c.

{
        len &= BLOB_ATTR_LEN_MASK;
        len |= (id << BLOB_ATTR_ID_SHIFT) & BLOB_ATTR_ID_MASK;
        attr->id_len = cpu_to_be32(len);
}

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blob_memdup()

struct blob_attr* blob_memdup

(

struct blob_attr *

attr

)

Definition at line 326 of file blob.c.

{
        struct blob_attr *ret;
        int size = blob_pad_len(attr);
 
        ret = malloc(size);
        if (!ret)
                return NULL;
 
        memcpy(ret, attr, size);
        return ret;
}

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blob_nest_end()

void blob_nest_end	(	struct blob_buf *	buf,
		void *	cookie
	)

Definition at line 185 of file blob.c.

{
        struct blob_attr *attr = offset_to_attr(buf, (unsigned long) cookie);
        blob_set_raw_len(attr, blob_pad_len(attr) + blob_len(buf->head));
        buf->head = attr;
}

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blob_nest_start()

void* blob_nest_start	(	struct blob_buf *	buf,
		int	id
	)

Definition at line 175 of file blob.c.

{
        unsigned long offset = attr_to_offset(buf, buf->head);
        buf->head = blob_new(buf, id, 0);
        if (!buf->head)
                return NULL;
        return (void *) offset;
}

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blob_new()

struct blob_attr* blob_new	(	struct blob_buf *	buf,
		int	id,
		int	payload
	)

Definition at line 132 of file blob.c.

{
        struct blob_attr *attr;
 
        attr = blob_add(buf, blob_next(buf->head), id, payload);
        if (!attr)
                return NULL;
 
        blob_set_raw_len(buf->head, blob_pad_len(buf->head) + blob_pad_len(attr));
        return attr;
}

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blob_parse()

int blob_parse	(	struct blob_attr *	attr,
		struct blob_attr **	data,
		const struct blob_attr_info *	info,
		int	max
	)

Definition at line 296 of file blob.c.

{
        struct blob_attr *pos;
        int found = 0;
        size_t rem;
 
        memset(data, 0, sizeof(struct blob_attr *) * max);
        blob_for_each_attr(pos, attr, rem) {
                found += blob_parse_attr(pos, rem, data, info, max);
        }
 
        return found;
}

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blob_parse_attr()

static int blob_parse_attr ( struct blob_attr *  attr, size_t  attr_len, struct blob_attr **  data, const struct blob_attr_info *  info, int  max  )

static

Definition at line 224 of file blob.c.

{
        int id;
        size_t len;
        int found = 0;
        size_t data_len;
 
        if (!attr || attr_len < sizeof(struct blob_attr))
                return 0;
 
        id = blob_id(attr);
        if (id >= max)
                return 0;
 
        len = blob_raw_len(attr);
        if (len > attr_len || len < sizeof(struct blob_attr))
                return 0;
 
        data_len = blob_len(attr);
        if (data_len > len)
                return 0;
 
        if (info) {
                int type = info[id].type;
 
                if (type < BLOB_ATTR_LAST) {
                        if (!blob_check_type(blob_data(attr), data_len, type))
                                return 0;
                }
 
                if (info[id].minlen && len < info[id].minlen)
                        return 0;
 
                if (info[id].maxlen && len > info[id].maxlen)
                        return 0;
 
                if (info[id].validate && !info[id].validate(&info[id], attr))
                        return 0;
        }
 
        if (!data[id])
                found++;
 
        data[id] = attr;
        return found;
}

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blob_parse_untrusted()

int blob_parse_untrusted	(	struct blob_attr *	attr,
		size_t	attr_len,
		struct blob_attr **	data,
		const struct blob_attr_info *	info,
		int	max
	)

Definition at line 272 of file blob.c.

{
        struct blob_attr *pos;
        size_t len = 0;
        int found = 0;
        size_t rem;
 
        if (!attr || attr_len < sizeof(struct blob_attr))
                return 0;
 
        len = blob_raw_len(attr);
        if (attr_len < len)
                return 0;
 
        memset(data, 0, sizeof(struct blob_attr *) * max);
        blob_for_each_attr_len(pos, attr, len, rem) {
                found += blob_parse_attr(pos, rem, data, info, max);
        }
 
        return found;
}

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blob_put()

struct blob_attr* blob_put	(	struct blob_buf *	buf,
		int	id,
		const void *	ptr,
		unsigned int	len
	)

Definition at line 161 of file blob.c.

{
        struct blob_attr *attr;
 
        attr = blob_new(buf, id, len);
        if (!attr)
                return NULL;
 
        if (ptr)
                memcpy(blob_data(attr), ptr, len);
        return attr;
}

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blob_put_raw()

struct blob_attr* blob_put_raw	(	struct blob_buf *	buf,
		const void *	ptr,
		unsigned int	len
	)

Definition at line 145 of file blob.c.

{
        struct blob_attr *attr;
 
        if (len < sizeof(struct blob_attr) || !ptr)
                return NULL;
 
        attr = blob_add(buf, blob_next(buf->head), 0, len - sizeof(struct blob_attr));
        if (!attr)
                return NULL;
        blob_set_raw_len(buf->head, blob_pad_len(buf->head) + len);
        memcpy(attr, ptr, len);
        return attr;
}

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blob_set_raw_len()

void blob_set_raw_len	(	struct blob_attr *	attr,
		unsigned int	len
	)

Definition at line 124 of file blob.c.

{
        len &= BLOB_ATTR_LEN_MASK;
        attr->id_len &= ~cpu_to_be32(BLOB_ATTR_LEN_MASK);
        attr->id_len |= cpu_to_be32(len);
}

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offset_to_attr()

static struct blob_attr* offset_to_attr ( struct blob_buf *  buf, int  offset  )

inlinestatic

Definition at line 44 of file blob.c.

{
        void *ptr = (char *)buf->buf + offset - BLOB_COOKIE;
        return ptr;
}

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Variable Documentation

blob_type_minlen

const size_t blob_type_minlen[BLOB_ATTR_LAST]

static

Initial value:

= {
        [BLOB_ATTR_STRING] = 1,
        [BLOB_ATTR_INT8] = sizeof(uint8_t),
        [BLOB_ATTR_INT16] = sizeof(uint16_t),
        [BLOB_ATTR_INT32] = sizeof(uint32_t),
        [BLOB_ATTR_INT64] = sizeof(uint64_t),
        [BLOB_ATTR_DOUBLE] = sizeof(double),
}

Definition at line 192 of file blob.c.