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#include "blob.h"
const blob_t BLOB_NULL = { NULL, 0 };
static const char *xd = "0123456789abcdefghijklmnopqrstuvwxyz";
static inline int dx(int c)
{
if (likely(c >= '0' && c <= '9'))
return c - '0';
if (likely(c >= 'a' && c <= 'f'))
return c - 'a' + 0xa;
if (c >= 'A' && c <= 'F')
return c - 'A' + 0xa;
return -1;
}
char *blob_cstr_dup(blob_t b)
{
char *p;
if (blob_is_null(b))
return NULL;
p = malloc(b.len+1);
if (p != NULL) {
memcpy(p, b.ptr, b.len);
p[b.len] = 0;
}
return p;
}
blob_t blob_dup(blob_t b)
{
blob_t p;
if (blob_is_null(b))
return BLOB_NULL;
p.ptr = malloc(b.len);
if (p.ptr != NULL) {
memcpy(p.ptr, b.ptr, b.len);
p.len = b.len;
} else {
p.len = 0;
}
return p;
}
int blob_cmp(blob_t a, blob_t b)
{
if (a.len != b.len)
return a.len - b.len;
return memcmp(a.ptr, b.ptr, a.len);
}
blob_t blob_pushed(blob_t buffer, blob_t left)
{
if (buffer.ptr + buffer.len != left.ptr + left.len)
return BLOB_NULL;
return BLOB_PTR_LEN(buffer.ptr, left.ptr - buffer.ptr);
}
void blob_push(blob_t *b, blob_t d)
{
if (b->len >= d.len) {
memcpy(b->ptr, d.ptr, d.len);
b->ptr += d.len;
b->len -= d.len;
} else {
*b = BLOB_NULL;
}
}
void blob_push_uint(blob_t *to, unsigned int value, int radix)
{
char buf[64];
char *ptr = &buf[sizeof(buf)-1];
if (value == 0) {
blob_push(to, BLOB_STR("0"));
return;
}
while (value != 0) {
*(ptr--) = xd[value % radix];
value /= radix;
}
blob_push(to, BLOB_PTR_PTR(ptr+1, &buf[sizeof(buf)-1]));
}
void blob_push_hexdump(blob_t *to, blob_t binary)
{
static const char *xd = "0123456789abcdef";
char *d;
int i;
if (blob_is_null(*to))
return;
if (to->len < binary.len * 2) {
*to = BLOB_NULL;
return;
}
for (i = 0, d = to->ptr; i < binary.len; i++) {
*(d++) = xd[(binary.ptr[i] >> 4) & 0xf];
*(d++) = xd[binary.ptr[i] & 0xf];
}
to->ptr = d;
to->len -= binary.len * 2;
}
blob_t blob_pull(blob_t *b, int len)
{
blob_t r;
if (b->len >= len) {
r = BLOB_PTR_LEN(b->ptr, len);
b->ptr += len;
b->len -= len;
return r;
}
*b = BLOB_NULL;
return BLOB_NULL;
}
void blob_pull_skip(blob_t *b, int len)
{
if (b->len >= len) {
b->ptr += len;
b->len -= len;
} else {
*b = BLOB_NULL;
}
}
int blob_pull_matching(blob_t *b, blob_t e)
{
if (b->len < e.len)
return 0;
if (memcmp(b->ptr, e.ptr, e.len) != 0)
return 0;
b->ptr += e.len;
b->len -= e.len;
return 1;
}
unsigned int blob_pull_uint(blob_t *b, int radix)
{
unsigned int val;
int ch;
val = 0;
while (b->len && b->ptr[0] != 0) {
ch = dx(b->ptr[0]);
if (ch < 0 || ch >= radix)
break;
val *= radix;
val += ch;
b->ptr++;
b->len--;
}
return val;
}
blob_t blob_pull_cspn(blob_t *b, const blob_t reject)
{
blob_t t = *b;
int i;
for (i = 0; i < t.len; i++) {
if (memchr(reject.ptr, t.ptr[i], reject.len) != NULL) {
*b = BLOB_PTR_LEN(t.ptr + i, t.len - i);
return BLOB_PTR_LEN(t.ptr, i);
}
}
*b = BLOB_NULL;
return t;
}
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