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0.13.1
Simple HTTP client with HTTP/1.1, HTTP/2, and HTTP/3 support
Security advisory:
This version has known vulnerabilities.
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Files
c_src/lsquic/src/liblsquic/lsquic_varint.h
/* Copyright (c) 2017 - 2022 LiteSpeed Technologies Inc. See LICENSE. */
#ifndef LSQUIC_VARINT_H
#define LSQUIC_VARINT_H 1
#define VINT_MASK ((1 << 6) - 1)
/* See [draft-ietf-quic-transport-11], section-7.1 */
#define vint_val2bits(val) ( \
((val) >= (1 << 6)) + ((val) >= (1 << 14)) + ((val) >= (1 << 30)))
#define vint_size(val) (1u << vint_val2bits(val))
#define VINT_MAX_VALUE ((1ull << 62) - 1)
/* Map
* 0 -> 6
* 1 -> 14
* 2 -> 30
* 3 -> 62
*/
#define vint_bits2shift(bits) ((1 << (3 + (bits))) - 2)
#define VINT_MAX_B(bits_) ((1ull << (vint_bits2shift(bits_))) - 1)
/* Maximum value that can be encoded as one byte: */
#define VINT_MAX_ONE_BYTE VINT_MAX_B(0)
int
lsquic_varint_read (const unsigned char *p, const unsigned char *end,
uint64_t *valp);
#define vint_read lsquic_varint_read
struct varint_read_state
{
uint64_t val;
int pos;
};
int
lsquic_varint_read_nb (const unsigned char **p, const unsigned char *end,
struct varint_read_state *);
struct varint_read2_state
{
uint64_t vr2s_one;
struct varint_read_state vr2s_varint_state;
#define vr2s_two vr2s_varint_state.val
enum {
VR2S_READ_ONE_BEGIN = 0,
VR2S_READ_ONE_CONTINUE,
VR2S_READ_TWO_BEGIN,
VR2S_READ_TWO_CONTINUE,
} vr2s_state;
};
/* When first called, vr2s_state must be set to 0.
*
* Returns 0 when both varint values have been read. They are available
* in vr2s_one and vr2s_two.
*
* Returns -1 when more input is needed.
*/
int
lsquic_varint_read_two (const unsigned char **p, const unsigned char *end,
struct varint_read2_state *);
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define vint_write(dst, val, bits, len) do { \
uint64_t buf_ = (val) \
| (uint64_t) (bits) << vint_bits2shift(bits); \
buf_ = bswap_64(buf_); \
memcpy(dst, (unsigned char *) &buf_ + 8 - (len), (len)); \
} while (0)
#else
#define vint_write(dst, val, bits, len) do { \
uint64_t buf_ = (val) \
| (uint64_t) (bits) << vint_bits2shift(bits); \
memcpy(dst, (unsigned char *) &buf_ + 8 - (len), (len)); \
} while (0)
#endif
#endif