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Functions
pg_nodiscard int	pg_b64_encode (const char src, int len, char dst, int dstlen)

pg_nodiscard int	pg_b64_decode (const char src, int len, char dst, int dstlen)

int	pg_b64_enc_len (int srclen)

int	pg_b64_dec_len (int srclen)

Function Documentation

◆ pg_b64_dec_len()

int pg_b64_dec_len ( int srclen )

Definition at line 239 of file base64.c.

{
    return (srclen * 3) >> 2;
}

Referenced by parse_scram_secret(), pqConnectOptions2(), read_client_final_message(), read_server_final_message(), read_server_first_message(), and scram_verify_plain_password().

◆ pg_b64_decode()

pg_nodiscard int pg_b64_decode	(	const char *	src,
		int	len,
		char *	dst,
		int	dstlen
	)

Definition at line 116 of file base64.c.

{
    const char *srcend = src + len,
               *s = src;
    char       *p = dst;
    char        c;
    int         b = 0;
    uint32      buf = 0;
    int         pos = 0,
                end = 0;
 
    while (s < srcend)
    {
        c = *s++;
 
        /* Leave if a whitespace is found */
        if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
            goto error;
 
        if (c == '=')
        {
            /* end sequence */
            if (!end)
            {
                if (pos == 2)
                    end = 1;
                else if (pos == 3)
                    end = 2;
                else
                {
                    /*
                     * Unexpected "=" character found while decoding base64
                     * sequence.
                     */
                    goto error;
                }
            }
            b = 0;
        }
        else
        {
            b = -1;
            if (c > 0 && c < 127)
                b = b64lookup[(unsigned char) c];
            if (b < 0)
            {
                /* invalid symbol found */
                goto error;
            }
        }
        /* add it to buffer */
        buf = (buf << 6) + b;
        pos++;
        if (pos == 4)
        {
            /*
             * Leave if there is an overflow in the area allocated for the
             * decoded string.
             */
            if ((p - dst + 1) > dstlen)
                goto error;
            *p++ = (buf >> 16) & 255;
 
            if (end == 0 || end > 1)
            {
                /* overflow check */
                if ((p - dst + 1) > dstlen)
                    goto error;
                *p++ = (buf >> 8) & 255;
            }
            if (end == 0 || end > 2)
            {
                /* overflow check */
                if ((p - dst + 1) > dstlen)
                    goto error;
                *p++ = buf & 255;
            }
            buf = 0;
            pos = 0;
        }
    }
 
    if (pos != 0)
    {
        /*
         * base64 end sequence is invalid.  Input data is missing padding, is
         * truncated or is otherwise corrupted.
         */
        goto error;
    }
 
    Assert((p - dst) <= dstlen);
    return p - dst;
 
error:
    memset(dst, 0, dstlen);
    return -1;
}

References Assert(), b, b64lookup, buf, error(), and len.

Referenced by parse_scram_secret(), pqConnectOptions2(), read_client_final_message(), read_server_final_message(), read_server_first_message(), and scram_verify_plain_password().

◆ pg_b64_enc_len()

int pg_b64_enc_len ( int srclen )

Definition at line 224 of file base64.c.

{
    /* 3 bytes will be converted to 4 */
    return (srclen + 2) / 3 * 4;
}

Referenced by build_client_final_message(), build_client_first_message(), build_server_final_message(), build_server_first_message(), connect_pg_server(), mock_scram_secret(), read_client_final_message(), and scram_build_secret().

◆ pg_b64_encode()

pg_nodiscard int pg_b64_encode	(	const char *	src,
		int	len,
		char *	dst,
		int	dstlen
	)

Definition at line 49 of file base64.c.

{
    char       *p;
    const char *s,
               *end = src + len;
    int         pos = 2;
    uint32      buf = 0;
 
    s = src;
    p = dst;
 
    while (s < end)
    {
        buf |= (unsigned char) *s << (pos << 3);
        pos--;
        s++;
 
        /* write it out */
        if (pos < 0)
        {
            /*
             * Leave if there is an overflow in the area allocated for the
             * encoded string.
             */
            if ((p - dst + 4) > dstlen)
                goto error;
 
            *p++ = _base64[(buf >> 18) & 0x3f];
            *p++ = _base64[(buf >> 12) & 0x3f];
            *p++ = _base64[(buf >> 6) & 0x3f];
            *p++ = _base64[buf & 0x3f];
 
            pos = 2;
            buf = 0;
        }
    }
    if (pos != 2)
    {
        /*
         * Leave if there is an overflow in the area allocated for the encoded
         * string.
         */
        if ((p - dst + 4) > dstlen)
            goto error;
 
        *p++ = _base64[(buf >> 18) & 0x3f];
        *p++ = _base64[(buf >> 12) & 0x3f];
        *p++ = (pos == 0) ? _base64[(buf >> 6) & 0x3f] : '=';
        *p++ = '=';
    }
 
    Assert((p - dst) <= dstlen);
    return p - dst;
 
error:
    memset(dst, 0, dstlen);
    return -1;
}