login_check_credentials();
  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
  cookie_link_parameter("diff","diff","2");
  diffType = atoi(PD("diff","2"));
  cookie_render();
  if( P("from") && P("to") ){
    v1 = artifact_from_ci_and_filename("from");
    v2 = artifact_from_ci_and_filename("to");
  }else{
    Stmt q;
    v1 = name_to_rid_www("v1");
    v2 = name_to_rid_www("v2");

    /* If the two file versions being compared both have the same
    ** filename, then offer an "Annotate" link that constructs an

** Return the uninterpreted content of an artifact.  Used primarily
** to view artifacts that are images.
*/
void rawartifact_page(void){
  int rid = 0;
  char *zUuid;

  if( P("ci") ){
    rid = artifact_from_ci_and_filename(0);
  }
  if( rid==0 ){
    rid = name_to_rid_www("name");
  }
  login_check_credentials();
  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
  if( rid==0 ) fossil_redirect_home();

  style_footer();
}

/*
** Look for "ci" and "filename" query parameters.  If found, try to
** use them to extract the record ID of an artifact for the file.
**
** Also look for "fn" and "name" as an aliases for "filename".  If any
** "filename" or "fn" or "name" are present but "ci" is missing, then
** use "tip" as the default value for "ci".
**
** If zNameParam is not NULL, then use that parameter as the filename
** rather than "fn" or "filename" or "name".  the zNameParam is used


** for the from= and to= query parameters of /fdiff.


*/
int artifact_from_ci_and_filename(const char *zNameParam){
  const char *zFilename;
  const char *zCI;
  int cirid;
  Manifest *pManifest;
  ManifestFile *pFile;
  int rid = 0;

  if( zNameParam ){
    zFilename = P(zNameParam);
  }else{
    zFilename = P("filename");
    if( zFilename==0 ){
      zFilename = P("fn");
    }
    if( zFilename==0 ){
      zFilename = P("name");
    }
  }
  if( zFilename==0 ) return 0;

  zCI = PD("ci", "tip");
  cirid = name_to_typed_rid(zCI, "ci");
  if( cirid<=0 ) return 0;
  pManifest = manifest_get(cirid, CFTYPE_MANIFEST, 0);
  if( pManifest==0 ) return 0;
  manifest_file_rewind(pManifest);
  while( (pFile = manifest_file_next(pManifest,0))!=0 ){
    if( fossil_strcmp(zFilename, pFile->zName)==0 ){
      rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", pFile->zUuid);






      break;
    }
  }
  manifest_destroy(pManifest);
  return rid;
}

/*
** The "z" argument is a string that contains the text of a source code
** file.  This routine appends that text to the HTTP reply with line numbering.
**
** zLn is the ?ln= parameter for the HTTP query.  If there is an argument,

**
**   ln              - show line numbers
**   ln=N            - highlight line number N
**   ln=M-N          - highlight lines M through N inclusive
**   ln=M-N+Y-Z      - highlight lines M through N and Y through Z (inclusive)
**   verbose         - show more detail in the description
**   download        - redirect to the download (artifact page only)
**   name=NAME       - filename or hash as a query parameter
**   filename=NAME   - alternative spelling for "name="
**   fn=NAME         - alternative spelling for "name="
**   ci=VERSION      - The specific check-in to use with "name=" to
**                     identify the file.
**
** The /artifact page show the complete content of a file

** identified by HASH.  The /whatis page shows only a description
** of how the artifact is used.  The /file page shows the most recent
** version of the file or directory called NAME, or a list of the
** top-level directory if NAME is omitted.
**
** The name= query parameter can refer to either the name of a file,
** or an artifact hash.  If the ci= query parameter is also present,
** then name= must refer to a file name.  If ci= is omitted, either
** interpretation may be used.  When name= is a filename and ci=
** is omitted, a default value of "tip" is used for ci=.
**
** If name= is ambiguous in that it might be either a filename or
** a hash, then the hash interpretation is preferred for /artifact
** and /whatis and the filename interpretation is preferred for /file.
*/
void artifact_page(void){
  int rid = 0;
  Blob content;
  const char *zMime;
  Blob downloadName;
  int renderAsWiki = 0;
  int renderAsHtml = 0;
  int objType;
  int asText;
  const char *zUuid = 0;
  u32 objdescFlags = OBJDESC_BASE;
  int descOnly = fossil_strcmp(g.zPath,"whatis")==0;
  int isFile = fossil_strcmp(g.zPath,"file")==0;
  const char *zLn = P("ln");
  const char *zName = P("name");
  const char *zCI = P("ci");
  HQuery url;

  char *zCIUuid = 0;
  int isSymbolicCI = 0;  /* ci= exists and is a symbolic name, not a hash */
  int isBranchCI = 0;    /* ci= refers to a branch name */
  char *zHeader = 0;

  login_check_credentials();
  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }

  /* Capture and normalize the name= and ci= query parameters */
  if( zName==0 ){
    zName = P("filename");
    if( zName==0 ){
      zName = P("fn");
    }
  }
  if( zCI && strlen(zCI)==0 ){ zCI = 0; }
  if( zCI




   && name_to_uuid2(zCI, "ci", &zCIUuid)
   && sqlite3_strnicmp(zCIUuid, zCI, strlen(zCI))!=0
  ){
    isSymbolicCI = 1;
    isBranchCI = db_exists(
       "SELECT 1 FROM tagxref, blob"
       " WHERE blob.uuid=%Q AND tagxref.rid=blob.rid"
       "   AND tagxref.value=%Q AND tagxref.tagtype>0"
       "   AND tagxref.tagid=%d",
       zCIUuid, zCI, TAG_BRANCH
    );
  }

  /* The name= query parameter (or at least one of its alternative
  ** spellings) is required.  Except for /file, show a top-level
  ** directory listing if name= is omitted.
  */
  if( zName==0 ){
    if( isFile ){

      if( P("ci")==0 ) cgi_set_query_parameter("ci","tip");
      page_tree();
      return;

    }

    style_header("Missing name= query parameter");
    @ The name= query parameter is missing

    style_footer();





    return;
  }

  url_initialize(&url, g.zPath);
  url_add_parameter(&url, "name", zName);
  url_add_parameter(&url, "ci", zCI);



  if( zCI==0 && !isFile ){
    /* If there is no ci= query parameter, then prefer to interpret
    ** name= as a hash for /artifact and /whatis.  But for not for /file.
    ** For /file, a name= without a ci= while prefer to use the default
    ** "tip" value for ci=. */
    rid = name_to_rid(zName);




  }
  if( rid==0 ){
    rid = artifact_from_ci_and_filename(0);
  }
  if( rid==0 && zCI==0 && isFile ){
    /* For /file, only try to interpret name= as a hash if it did not
    ** match any known filename. */
    rid = name_to_rid(zName);
  }
  if( rid==0 && isFile ){
    /* If no file called NAME exists, instead look for a directory
    ** with that name, and do a directory listing */

    int nName = (int)strlen(zName);
    if( nName && zName[nName-1]=='/' ) nName--;
    if( db_exists(
       "SELECT 1 FROM filename"
       " WHERE name GLOB '%.*q/*' AND substr(name,1,%d)=='%.*q/';",
       nName, zName, nName+1, nName, zName
    ) ){
      if( P("ci")==0 ) cgi_set_query_parameter("ci","tip");
      page_tree();
      return;























    }
  }

  if( rid==0 ){
    style_header("No such artifact");
    @ Artifact '%h(zName)' does not exist in this repository.
    style_footer();
    return;
  }
  if( descOnly || P("verbose")!=0 ){
    url_add_parameter(&url, "verbose", "1");
    objdescFlags |= OBJDESC_DETAIL;
  }
  zUuid = db_text("?", "SELECT uuid FROM blob WHERE rid=%d", rid);

  if( isFile ){
    if( zCI==0 ){
      @ <h2>Latest version of file '%h(zName)':</h2>
    }else{
      const char *zPath;
      Blob path;
      blob_zero(&path);
      hyperlinked_path(zName, &path, zCI, "dir", "");
      zPath = blob_str(&path);
      @ <h2>File %s(zPath) \
      if( isBranchCI ){
        @ on branch %z(href("%R/timeline?r=%T",zCI))%h(zCI)</a></h2>
      }else if( isSymbolicCI ){
        @ as of check-in %z(href("/info/%!S",zCIUuid))%s(zCI)</a></h2>
      }else{

        @ as of check-in [%z(href("/info/%!S",zCIUuid))%S(zCIUuid)</a>]</h2>
      }
      blob_reset(&path);
    }
    style_submenu_element("Artifact", "%R/artifact/%S", zUuid);
  }else{
    @ <h2>Artifact
    style_copy_button(1, "hash-ar", 0, 2, "%s", zUuid);
    if( g.perm.Setup ){
      @  (%d(rid)):</h2>