/* capsule_blocks.c -- the block format of a .4th capsule payload.
 * See capsule_blocks.h.  Nothing here uses the C library or a VM.
 */
#include "starkernel/capsule_blocks.h"

int capsule_block_header(const uint8_t *p, const uint8_t *end,
                         uint32_t *out_num, const uint8_t **out_after)
{
    const uint8_t *q;
    uint32_t num = 0;

    if ((uint64_t)(end - p) < 7u) return 0;
    if (p[0] != 'B' || p[1] != 'l' || p[2] != 'o' || p[3] != 'c' || p[4] != 'k' || p[5] != ' ')
        return 0;

    q = p + 6;
    if (q >= end || *q < '0' || *q > '9') return 0;
    while (q < end && *q >= '0' && *q <= '9') {
        num = num * 10u + (uint32_t)(*q - '0');
        q++;
    }

    while (q < end && *q != '\n') q++;
    if (q < end) q++;

    *out_num   = num;
    *out_after = q;
    return 1;
}