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#if !defined(lint) && !defined(DOS)
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static char rcsid[] = "$Id: mimetype.c 343 2006-12-22 18:25:39Z hubert@u.washington.edu $";
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* ========================================================================
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* Copyright 2006 University of Washington
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* ========================================================================
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#include "../pith/headers.h"
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#include "../pith/mimetype.h"
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#include "../pith/state.h"
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#include "../pith/conf.h"
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#include "../pith/mailcap.h"
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#include "../pith/util.h"
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* We've decided not to implement the RFC1524 standard minimum path, because
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* some of us think it is harder to debug a problem when you may be misled
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* into looking at the wrong mailcap entry. Likewise for MIME.Types files.
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#if defined(DOS) || defined(OS2)
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#define MT_PATH_SEPARATOR ';'
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#define MT_USER_FILE "MIMETYPE"
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#define MT_STDPATH NULL
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#define MT_PATH_SEPARATOR ':'
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#define MT_USER_FILE NULL
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".mime.types:/etc/mime.types:/usr/local/lib/mime.types"
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#define LINE_BUF_SIZE 2000
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* Types used to pass parameters and operator functions to the
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* mime.types searching routines.
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#define MT_MAX_FILE_EXTENSION 3
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typedef int (* MT_OPERATORPROC)(MT_MAP_T *, FILE *);
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int mt_get_file_ext(char *, char **);
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int mt_srch_mime_type(MT_OPERATORPROC, MT_MAP_T *);
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int mt_browse_types_file(MT_OPERATORPROC, MT_MAP_T *, char *);
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int mt_srch_by_type(MT_MAP_T *, FILE *);
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int mt_translate_type(char *);
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* Exported function that does the work of sniffing the mime.types
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* files and filling in the body pointer if found. Returns 1 (TRUE) if
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* extension found, and body pointer filled in, 0 (FALSE) otherwise.
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set_mime_type_by_extension(struct mail_bodystruct *body, char *filename)
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if(mt_get_file_ext(filename, &e2b.from.ext)
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&& mt_srch_mime_type(mt_srch_by_ext, &e2b)){
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body->type = e2b.to.mime.type;
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body->subtype = e2b.to.mime.subtype; /* NOTE: subtype was malloc'd */
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* Exported function that maps from mime types to file extensions.
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set_mime_extension_by_type (char *ext, char *mtype)
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t2e.from.mime_type = mtype;
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return (mt_srch_mime_type (mt_srch_by_type, &t2e));
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* Separate and return a pointer to the first character in the 'filename'
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* character buffer that comes after the rightmost '.' character in the
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* filename. (What I mean is a pointer to the filename - extension).
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* Returns 1 if an extension is found, 0 otherwise.
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mt_get_file_ext(char *filename, char **extension)
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dprint((5, "mt_get_file_ext : filename=\"%s\", ",
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filename ? filename : "?"));
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for(*extension = NULL; filename && *filename; filename++)
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*extension = filename + 1;
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dprint((5, "extension=\"%s\"\n",
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(extension && *extension) ? *extension : "?"));
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return(*extension ? 1 : 0);
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* Build a list of possible mime.type files. For each one that exists
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* call the mt_operator function.
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* Loop terminates when mt_operator returns non-zero.
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mt_srch_mime_type(MT_OPERATORPROC mt_operator, MT_MAP_T *mt_map)
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char *s, *pathcopy, *path;
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dprint((5, "- mt_srch_mime_type -\n"));
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pathcopy = mc_conf_path(ps_global->VAR_MIMETYPE_PATH, getenv("MIMETYPES"),
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MT_USER_FILE, MT_PATH_SEPARATOR, MT_STDPATH);
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path = pathcopy; /* overloaded "path" */
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dprint((7, "mime_types: path: %s\n", path ? path : "?"));
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if(s = strindex(path, MT_PATH_SEPARATOR))
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if(rv = mt_browse_types_file(mt_operator, mt_map, path))
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fs_give((void **)&pathcopy);
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if(!rv && mime_os_specific_access()){
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if(mt_operator == mt_srch_by_ext){
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if(mime_get_os_mimetype_from_ext(mt_map->from.ext, buf, 256)){
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if(s = strindex(buf, '/')){
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mt_map->to.mime.type = mt_translate_type(buf);
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mt_map->to.mime.subtype = cpystr(s);
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else if(mt_operator == mt_srch_by_type){
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if(mime_get_os_ext_from_mimetype(mt_map->from.mime_type,
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mt_map->to.ext, 32)){
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/* the 32 comes from var ext[] in display_attachment() */
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if(*(s = mt_map->to.ext) == '.')
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panic("Unhandled mime type search");
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* Try to match a file extension against extensions found in the file
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* ``filename'' if that file exists. return 1 if a match
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* was found and 0 in all other cases.
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mt_browse_types_file(MT_OPERATORPROC mt_operator, MT_MAP_T *mt_map, char *filename)
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if(file = our_fopen(filename, "rb")){
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rv = (*mt_operator)(mt_map, file);
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dprint((1, "mt_browse: FAILED open(%s) : %s.\n",
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filename ? filename : "?", error_description(errno)));
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* scan each line of the file. Treat each line as a mime type definition.
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* The first word is a type/subtype specification. All following words
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* are file extensions belonging to that type/subtype. Words are separated
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* bij whitespace characters.
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* If a file extension occurs more than once, then the first definition
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* determines the file type and subtype.
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mt_srch_by_ext(MT_MAP_T *e2b, FILE *file)
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char buffer[LINE_BUF_SIZE];
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#if defined(DOS) || defined(OS2)
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#define STRCMP strucmp
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#define STRCMP strcmp
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/* construct a loop reading the file line by line. Then check each
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* line for a matching definition.
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while(fgets(buffer,LINE_BUF_SIZE,file) != NULL){
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continue; /* comment */
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/* remove last character from the buffer */
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buffer[strlen(buffer)-1] = '\0';
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/* divide the input buffer into words separated by whitespace.
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* The first words is the type and subtype. All following words
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* are file extensions.
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dprint((5, "traverse: buffer=\"%s\"\n", buffer));
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typespec = strtok(buffer," \t"); /* extract type,subtype */
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dprint((5, "typespec=\"%s\"\n", typespec ? typespec : "?"));
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while((try_extension = strtok(NULL, " \t")) != NULL){
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/* compare the extensions, and assign the type if a match
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dprint((5,"traverse: trying ext \"%s\"\n",try_extension));
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if(STRCMP(try_extension, e2b->from.ext) == 0){
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/* split the 'type/subtype' specification */
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char *type, *subtype = NULL;
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type = strtok(typespec,"/");
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subtype = strtok(NULL,"/");
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dprint((5, "traverse: type=%s, subtype=%s.\n",
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type ? type : "<null>",
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subtype ? subtype : "<null>"));
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/* The type is encoded as a small integer. we have to
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* translate the character string naming the type into
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* the corresponding number.
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e2b->to.mime.type = mt_translate_type(type);
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e2b->to.mime.subtype = cpystr(subtype ? subtype : "x-unknown");
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return 1; /* a match has been found */
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dprint((5, "traverse: search failed.\n"));
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* scan each line of the file. Treat each line as a mime type definition.
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* Here we are looking for a matching type. When that is found return the
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* first extension that is three chars or less.
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mt_srch_by_type(MT_MAP_T *t2e, FILE *file)
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char buffer[LINE_BUF_SIZE];
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/* construct a loop reading the file line by line. Then check each
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* line for a matching definition.
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while(fgets(buffer,LINE_BUF_SIZE,file) != NULL){
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continue; /* comment */
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/* remove last character from the buffer */
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buffer[strlen(buffer)-1] = '\0';
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/* divide the input buffer into words separated by whitespace.
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* The first words is the type and subtype. All following words
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* are file extensions.
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dprint((5, "traverse: buffer=%s.\n", buffer));
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typespec = strtok(buffer," \t"); /* extract type,subtype */
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dprint((5, "typespec=%s.\n", typespec ? typespec : "?"));
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if (strucmp (typespec, t2e->from.mime_type) == 0) {
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while((try_extension = strtok(NULL, " \t")) != NULL) {
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if (strlen (try_extension) <= MT_MAX_FILE_EXTENSION) {
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strncpy (t2e->to.ext, try_extension, 32);
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* not sure of the 32, so don't write to byte 32
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* t2e->to.ext[31] = '\0';
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* in case that breaks something
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dprint((5, "traverse: search failed.\n"));
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* Translate a character string representing a content type into a short
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* integer number, according to the coding described in c-client/mail.h
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* List of content types taken from rfc1521, September 1993.
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mt_translate_type(char *type)
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for (i=0;(i<=TYPEMAX) && body_types[i] && strucmp(type,body_types[i]);i++)
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else if (!body_types[i]) /* if empty slot, assign it to this type */
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body_types[i] = cpystr (type);
added
removed
pith/mimetype.c
