mime: drop internal FILE * support.

- The part kind MIMEKIND_FILE and associated code are suppressed.
- Seek data origin offset not used anymore: suppressed.
- MIMEKIND_NAMEDFILE renamed MIMEKIND_FILE; associated fields/functions
  renamed accordingly.
- Curl_getformdata() processes stdin via a callback.

3 files changed, 70 insertions, 134 deletions

diff --git a/lib/formdata.c b/lib/formdata.c
index 9bfe7b542..61ae78d91 100644
--- a/lib/formdata.c
+++ b/lib/formdata.c
@@ -897,8 +897,16 @@ CURLcode Curl_getformdata(struct Curl_easy *data,
           clen = -1;
 
         if(post->flags & (HTTPPOST_FILENAME | HTTPPOST_READFILE)) {
-          if(!strcmp(file->contents, "-"))
-            result = Curl_mime_file(part, stdin, 0);
+          if(!strcmp(file->contents, "-")) {
+            /* There are a few cases where the code below won't work; in
+               particular, freopen(stdin) by the caller is not guaranteed
+               to result as expected. This feature has been kept for backward
+               compatibility: use of "-" pseudo file name should be avoided. */
+            result = curl_mime_data_cb(part, (curl_off_t) -1,
+                                       (curl_read_callback) fread,
+                                       (curl_seek_callback) fseek,
+                                       NULL, (void *) stdin);
+          }
           else
             result = curl_mime_filedata(part, file->contents);
           if(!result && (post->flags & HTTPPOST_READFILE))
diff --git a/lib/mime.c b/lib/mime.c
index e21de2873..514f6b2ae 100644
--- a/lib/mime.c
+++ b/lib/mime.c
@@ -662,76 +662,50 @@ static void mime_mem_free(void *ptr)
 }
 
 
-/* Open file callbacks. */
-/* Argument is the FILE pointer. */
-static size_t mime_file_read(char *buffer, size_t size, size_t nitems,
-                             void *instream)
-{
-  return (size_t) fread(buffer, size, nitems, instream);
-}
-
-static int mime_file_seek(void *instream, curl_off_t offset, int whence)
-{
-  FILE *fp = (FILE *) instream;
-
-  return fseek(fp, (long) offset, whence)?
-         CURL_SEEKFUNC_CANTSEEK: CURL_SEEKFUNC_OK;
-}
-
-
 /* Named file callbacks. */
 /* Argument is a pointer to the mime part. */
-static int mime_open_namedfile(curl_mimepart * part)
+static int mime_open_file(curl_mimepart * part)
 {
-  /* Open a MIMEKIND_NAMEDFILE part. */
+  /* Open a MIMEKIND_FILE part. */
 
-  if(part->namedfp)
+  if(part->fp)
     return 0;
-  part->namedfp = fopen_read(part->data, "rb");
-  return part->namedfp? 0: -1;
+  part->fp = fopen_read(part->data, "rb");
+  return part->fp? 0: -1;
 }
 
-static size_t mime_namedfile_read(char *buffer, size_t size, size_t nitems,
-                                  void *instream)
+static size_t mime_file_read(char *buffer, size_t size, size_t nitems,
+                             void *instream)
 {
   curl_mimepart *part = (curl_mimepart *) instream;
 
-  if(mime_open_namedfile(part))
+  if(mime_open_file(part))
     return READ_ERROR;
 
-  return mime_file_read(buffer, size, nitems, part->namedfp);
+  return fread(buffer, size, nitems, part->fp);
 }
 
-static int mime_namedfile_seek(void *instream, curl_off_t offset, int whence)
+static int mime_file_seek(void *instream, curl_off_t offset, int whence)
 {
   curl_mimepart *part = (curl_mimepart *) instream;
 
-  switch(whence) {
-  case SEEK_CUR:
-    if(part->namedfp)
-      offset += ftell(part->namedfp);
-    break;
-  case SEEK_END:
-    offset += part->datasize;
-    break;
-  }
-
-  if(!offset && !part->namedfp)
-    return CURL_SEEKFUNC_OK;
+  if(whence == SEEK_SET && !offset && !part->fp)
+    return CURL_SEEKFUNC_OK;   /* Not open: implicitly already at BOF. */
 
-  if(mime_open_namedfile(part))
+  if(mime_open_file(part))
     return CURL_SEEKFUNC_FAIL;
 
-  return mime_file_seek(part->namedfp, offset, SEEK_SET);
+  return fseek(part->fp, (long) offset, whence)?
+               CURL_SEEKFUNC_CANTSEEK: CURL_SEEKFUNC_OK;
 }
 
-static void mime_namedfile_free(void *ptr)
+static void mime_file_free(void *ptr)
 {
   curl_mimepart *part = (curl_mimepart *) ptr;
 
-  if(part->namedfp) {
-    fclose(part->namedfp);
-    part->namedfp = NULL;
+  if(part->fp) {
+    fclose(part->fp);
+    part->fp = NULL;
   }
   Curl_safefree(part->data);
   part->data = NULL;
@@ -912,9 +886,9 @@ static size_t readback_part(curl_mimepart *part,
       case 0:
         mimesetstate(&part->state, MIMESTATE_END, NULL);
         /* Try sparing open file descriptors. */
-        if(part->kind == MIMEKIND_NAMEDFILE && part->namedfp) {
-          fclose(part->namedfp);
-          part->namedfp = NULL;
+        if(part->kind == MIMEKIND_FILE && part->fp) {
+          fclose(part->fp);
+          part->fp = NULL;
         }
         /* FALLTHROUGH */
       case CURL_READFUNC_ABORT:
@@ -1050,7 +1024,7 @@ static int mime_part_rewind(curl_mimepart *part)
   if(part->state.state > targetstate) {
     res = CURL_SEEKFUNC_CANTSEEK;
     if(part->seekfunc) {
-      res = part->seekfunc(part->arg, part->origin, SEEK_SET);
+      res = part->seekfunc(part->arg, (curl_off_t) 0, SEEK_SET);
       switch(res) {
       case CURL_SEEKFUNC_OK:
       case CURL_SEEKFUNC_FAIL:
@@ -1113,10 +1087,9 @@ static void cleanup_part_content(curl_mimepart *part)
   part->readfunc = NULL;
   part->seekfunc = NULL;
   part->freefunc = NULL;
-  part->arg = NULL;
+  part->arg = (void *) part;          /* Defaults to part itself. */
   part->data = NULL;
-  part->namedfp = NULL;
-  part->origin = 0;
+  part->fp = NULL;
   part->datasize = (curl_off_t) 0;    /* No size yet. */
   part->encoder = NULL;
   cleanup_encoder_state(&part->encstate);
@@ -1289,86 +1262,57 @@ CURLcode curl_mime_data(curl_mimepart *part,
     part->readfunc = mime_mem_read;
     part->seekfunc = mime_mem_seek;
     part->freefunc = mime_mem_free;
-    part->arg = part;
     part->kind = MIMEKIND_DATA;
   }
 
   return CURLE_OK;
 }
 
-/* Set mime part content from opened file. */
-CURLcode Curl_mime_file(curl_mimepart *part,
-                        FILE *fp, int closewhendone)
-{
-  if(!part || !fp)
-    return CURLE_BAD_FUNCTION_ARGUMENT;
-
-  cleanup_part_content(part);
-
-  part->arg = fp;
-  part->readfunc = (curl_read_callback) mime_file_read;
-  if(closewhendone)
-    part->freefunc = (curl_free_callback) fclose;
-  part->origin = ftell(fp);
-  /* Check if file is seekable and get its size. */
-  part->datasize = (curl_off_t) -1;    /* Unknown size. */
-  if(!fseek(fp, 0L, SEEK_END)) {
-    part->datasize = ftell(fp);
-    if(part->datasize >= 0) {
-      if(part->datasize < part->origin)
-        part->datasize = 0;
-      else
-        part->datasize -= part->origin;
-      part->seekfunc = mime_file_seek;
-    }
-    fseek(fp, (long) part->origin, SEEK_SET);
-  }
-  part->kind = MIMEKIND_FILE;
-  return CURLE_OK;
-}
-
 /* Set mime part content from named local file. */
 CURLcode curl_mime_filedata(curl_mimepart *part, const char *filename)
 {
   CURLcode result = CURLE_OK;
-  struct_stat sbuf;
   char *base;
 
-  if(!part || !filename)
+  if(!part)
     return CURLE_BAD_FUNCTION_ARGUMENT;
 
-  if(stat(filename, &sbuf) || access(filename, R_OK))
-    result = CURLE_READ_ERROR;
-
   cleanup_part_content(part);
 
-  part->data = strdup(filename);
-  if(!part->data)
-    result = CURLE_OUT_OF_MEMORY;
+  if(filename) {
+    struct_stat sbuf;
 
-  part->datasize = -1;
-  if(!result && S_ISREG(sbuf.st_mode)) {
-    part->datasize = filesize(filename, sbuf);
-    part->seekfunc = mime_namedfile_seek;
-  }
+    if(stat(filename, &sbuf) || access(filename, R_OK))
+      result = CURLE_READ_ERROR;
 
-  part->readfunc = mime_namedfile_read;
-  part->freefunc = mime_namedfile_free;
-  part->arg = part;
-  part->kind = MIMEKIND_NAMEDFILE;
-
-  /* As a side effect, set the filename to the current file's base name.
-     It is possible to withdraw this by explicitly calling curl_mime_filename()
-     with a NULL filename argument after the current call. */
-  base = strippath(filename);
-  if(!base)
-    result = CURLE_OUT_OF_MEMORY;
-  else {
-    CURLcode res = curl_mime_filename(part, base);
+    part->data = strdup(filename);
+    if(!part->data)
+      result = CURLE_OUT_OF_MEMORY;
 
-    if(res)
-      result = res;
-    free(base);
+    part->datasize = -1;
+    if(!result && S_ISREG(sbuf.st_mode)) {
+      part->datasize = filesize(filename, sbuf);
+      part->seekfunc = mime_file_seek;
+    }
+
+    part->readfunc = mime_file_read;
+    part->freefunc = mime_file_free;
+    part->kind = MIMEKIND_FILE;
+
+    /* As a side effect, set the filename to the current file's base name.
+       It is possible to withdraw this by explicitly calling
+       curl_mime_filename() with a NULL filename argument after the current
+       call. */
+    base = strippath(filename);
+    if(!base)
+      result = CURLE_OUT_OF_MEMORY;
+    else {
+      CURLcode res = curl_mime_filename(part, base);
+
+      if(res)
+        result = res;
+      free(base);
+    }
   }
   return result;
 }
@@ -1670,18 +1614,13 @@ CURLcode Curl_mime_prepare_headers(curl_mimepart *part,
     case MIMEKIND_MULTIPART:
       contenttype = MULTIPART_CONTENTTYPE_DEFAULT;
       break;
-    case MIMEKIND_NAMEDFILE:
+    case MIMEKIND_FILE:
       contenttype = ContentTypeForFilename(part->filename);
       if(!contenttype)
         contenttype = ContentTypeForFilename(part->data);
       if(!contenttype && part->filename)
         contenttype = FILE_CONTENTTYPE_DEFAULT;
       break;
-    case MIMEKIND_FILE:
-      contenttype = ContentTypeForFilename(part->filename);
-      if(!contenttype && part->filename)
-        contenttype = FILE_CONTENTTYPE_DEFAULT;
-      break;
     default:
       contenttype = ContentTypeForFilename(part->filename);
       break;
@@ -1839,14 +1778,6 @@ CURLcode curl_mime_data(curl_mimepart *part,
   return CURLE_NOT_BUILT_IN;
 }
 
-CURLcode Curl_mime_file(curl_mimepart *part, FILE *fp, int closewhendone)
-{
-  (void) part;
-  (void) fp;
-  (void) closewhendone;
-  return CURLE_NOT_BUILT_IN;
-}
-
 CURLcode curl_mime_filedata(curl_mimepart *part, const char *filename)
 {
   (void) part;
diff --git a/lib/mime.h b/lib/mime.h
index 0ca4f69c9..f22d01352 100644
--- a/lib/mime.h
+++ b/lib/mime.h
@@ -34,8 +34,7 @@
 enum mimekind {
   MIMEKIND_NONE = 0,            /* Part not set. */
   MIMEKIND_DATA,                /* Allocated mime data. */
-  MIMEKIND_NAMEDFILE,           /* Data from named file. */
-  MIMEKIND_FILE,                /* Data from file pointer. */
+  MIMEKIND_FILE,                /* Data from file. */
   MIMEKIND_CALLBACK,            /* Data from `read' callback. */
   MIMEKIND_MULTIPART,           /* Data is a mime subpart. */
   MIMEKIND_LAST
@@ -106,14 +105,13 @@ struct curl_mimepart_s {
   curl_seek_callback seekfunc;     /* Seek function. */
   curl_free_callback freefunc;     /* Argument free function. */
   void *arg;                       /* Argument to callback functions. */
-  FILE *namedfp;                   /* Named file pointer. */
+  FILE *fp;                        /* File pointer. */
   struct curl_slist *curlheaders;  /* Part headers. */
   struct curl_slist *userheaders;  /* Part headers. */
   char *mimetype;                  /* Part mime type. */
   char *filename;                  /* Remote file name. */
   char *name;                      /* Data name. */
   size_t namesize;                 /* Data name size. */
-  curl_off_t origin;               /* Origin file offset. */
   curl_off_t datasize;             /* Expected data size. */
   unsigned int flags;              /* Flags. */
   mime_state state;                /* Current readback state. */
@@ -134,6 +132,5 @@ size_t Curl_mime_read(char *buffer, size_t size, size_t nitems,
                       void *instream);
 CURLcode Curl_mime_rewind(curl_mimepart *part);
 CURLcode Curl_mime_add_header(struct curl_slist **slp, const char *fmt, ...);
-CURLcode Curl_mime_file(curl_mimepart *part, FILE *fp, int closewhendone);
 
 #endif /* HEADER_CURL_MIME_H */