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libdocument: Add function to sniff MIME type from FD

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This commit is contained in:
Christian Persch 2022-01-11 20:42:24 +01:00 committed by Germán Poo-Caamaño
parent a582f52f27
commit f88af66538
2 changed files with 78 additions and 0 deletions
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74
libdocument/ev-file-helpers.c
View File

@ -503,6 +503,80 @@ ev_file_get_mime_type (const gchar *uri,
return fast ? get_mime_type_from_uri (uri, error) : get_mime_type_from_data (uri, error);
}
/**
* ev_file_get_mime_type_from_fd:
* @fd: an file descriptor (must be seekable)
* @error: a #GError location to store an error, or %NULL
*
* Returns: a newly allocated string with the MIME type of the file referred to
* by @fd, or %NULL on error or if the MIME type could not be determined
*/
gchar *
ev_file_get_mime_type_from_fd (int fd,
GError **error)
{
guchar buffer[4096];
ssize_t r;
off_t pos;
char *content_type, *mime_type;
g_return_val_if_fail (fd != -1, NULL);
pos = lseek (fd, 0, SEEK_CUR);
if (pos == (off_t)-1) {
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
"Failed to get MIME type: %s",
g_strerror (errsv));
return NULL;
}
do {
r = read (fd, buffer, sizeof (buffer));
} while (r == -1 && errno == EINTR);
if (r == -1) {
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
"Failed to get MIME type: %s",
g_strerror (errsv));
(void) lseek (fd, pos, SEEK_SET);
return NULL;
}
if (lseek (fd, pos, SEEK_SET) == (off_t)-1) {
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
"Failed to get MIME type: %s",
g_strerror (errsv));
return NULL;
}
content_type = g_content_type_guess (NULL, /* no filename */
buffer, r,
NULL);
if (content_type == NULL) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Unknown MIME Type"));
return NULL;
}
mime_type = g_content_type_get_mime_type (content_type);
g_free (content_type);
if (mime_type == NULL) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Unknown MIME Type"));
return NULL;
}
return mime_type;
}
/* Compressed files support */
static const char *compressor_cmds[] = {

4
libdocument/ev-file-helpers.h
View File

@ -73,6 +73,10 @@ gchar *ev_file_get_mime_type (const gchar *uri,
gboolean fast,
GError **error);
EV_PUBLIC
gchar *ev_file_get_mime_type_from_fd (int fd,
GError **error);
EV_PUBLIC
gchar *ev_file_uncompress (const gchar *uri,
EvCompressionType type,