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src/http/v2/ngx_http_v2_encode.c - nginx source code

Functions defined

Source code


  2. /*
  3. * Copyright (C) Nginx, Inc.
  4. * Copyright (C) Valentin V. Bartenev
  5. */


  8. #include <ngx_config.h>
  9. #include <ngx_core.h>
  10. #include <ngx_http.h>


  13. static u_char *ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix,
  14.     ngx_uint_t value);


  17. u_char *
  18. ‌ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, u_char *tmp,
  19.     ngx_uint_t lower)
  20. {
  21.     size_t  hlen;

  23.     hlen = ngx_http_huff_encode(src, len, tmp, lower);

  25.     if (hlen > 0) {
  26.         *dst = NGX_HTTP_V2_ENCODE_HUFF;
  27.         dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), hlen);
  28.         return ngx_cpymem(dst, tmp, hlen);
  29.     }

  31.     *dst = NGX_HTTP_V2_ENCODE_RAW;
  32.     dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), len);

  34.     if (lower) {
  35.         ngx_strlow(dst, src, len);
  36.         return dst + len;
  37.     }

  39.     return ngx_cpymem(dst, src, len);
  40. }


  43. static u_char *
  44. ‌ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, ngx_uint_t value)
  45. {
  46.     if (value < prefix) {
  47.         *pos++ |= value;
  48.         return pos;
  49.     }

  51.     *pos++ |= prefix;
  52.     value -= prefix;

  54.     while (value >= 128) {
  55.         *pos++ = value % 128 + 128;
  56.         value /= 128;
  57.     }

  59.     *pos++ = (u_char) value;

  61.     return pos;
  62. }

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