mirror of https://github.com/openssl/openssl
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
#include "internal/quic_vlint.h"
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#include "internal/e_os.h"
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#ifndef OPENSSL_NO_QUIC
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void ossl_quic_vlint_encode_n(uint8_t *buf, uint64_t v, int n)
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{
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if (n == 1) {
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buf[0] = (uint8_t)v;
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} else if (n == 2) {
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buf[0] = (uint8_t)(0x40 | ((v >> 8) & 0x3F));
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buf[1] = (uint8_t)v;
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} else if (n == 4) {
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buf[0] = (uint8_t)(0x80 | ((v >> 24) & 0x3F));
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buf[1] = (uint8_t)(v >> 16);
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buf[2] = (uint8_t)(v >> 8);
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buf[3] = (uint8_t)v;
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} else {
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buf[0] = (uint8_t)(0xC0 | ((v >> 56) & 0x3F));
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buf[1] = (uint8_t)(v >> 48);
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buf[2] = (uint8_t)(v >> 40);
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buf[3] = (uint8_t)(v >> 32);
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buf[4] = (uint8_t)(v >> 24);
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buf[5] = (uint8_t)(v >> 16);
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buf[6] = (uint8_t)(v >> 8);
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buf[7] = (uint8_t)v;
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}
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}
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void ossl_quic_vlint_encode(uint8_t *buf, uint64_t v)
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{
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ossl_quic_vlint_encode_n(buf, v, ossl_quic_vlint_encode_len(v));
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}
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uint64_t ossl_quic_vlint_decode_unchecked(const unsigned char *buf)
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{
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uint8_t first_byte = buf[0];
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size_t sz = ossl_quic_vlint_decode_len(first_byte);
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if (sz == 1)
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return first_byte & 0x3F;
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if (sz == 2)
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return ((uint64_t)(first_byte & 0x3F) << 8)
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| buf[1];
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if (sz == 4)
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return ((uint64_t)(first_byte & 0x3F) << 24)
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| ((uint64_t)buf[1] << 16)
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| ((uint64_t)buf[2] << 8)
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| buf[3];
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return ((uint64_t)(first_byte & 0x3F) << 56)
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| ((uint64_t)buf[1] << 48)
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| ((uint64_t)buf[2] << 40)
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| ((uint64_t)buf[3] << 32)
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| ((uint64_t)buf[4] << 24)
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| ((uint64_t)buf[5] << 16)
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| ((uint64_t)buf[6] << 8)
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| buf[7];
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}
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int ossl_quic_vlint_decode(const unsigned char *buf, size_t buf_len, uint64_t *v)
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{
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size_t dec_len;
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uint64_t x;
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if (buf_len < 1)
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return 0;
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dec_len = ossl_quic_vlint_decode_len(buf[0]);
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if (buf_len < dec_len)
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return 0;
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x = ossl_quic_vlint_decode_unchecked(buf);
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*v = x;
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return dec_len;
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}
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#endif
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