libarchive: Implement manual file open-read-closev0.6.83

No write support.

1 files changed, 124 insertions, 76 deletions

diff --git a/libarchive/libarchive.c b/libarchive/libarchive.c
index 13789e1..e7647a4 100644
--- a/libarchive/libarchive.c
+++ b/libarchive/libarchive.c
@@ -1,5 +1,5 @@
 /*  libarchive plugin for Tux Commander
- *   version 0.3.1, designed for libarchive v3.6.1
+ *   version 0.4, designed for libarchive v3.6.1
  *  Copyright (C) 2008-2024 Tomas Bzatek <tbzatek@users.sourceforge.net>
  *   Check for updates on tuxcmd.sourceforge.net
  *
@@ -48,8 +48,8 @@
 #endif
 
 
-#define MODULE_VERSION "0.3.2"
-#define MODULE_BUILD_DATE "2024-10-23"
+#define MODULE_VERSION "0.4"
+#define MODULE_BUILD_DATE "2024-10-25"
 #define DEFAULT_BLOCK_SIZE 65536
 
 
@@ -607,37 +607,6 @@ TVFSResult VFSChangeTimes (struct TVFSGlobs *globs, char *APath, guint32 mtime,
 /******************************************************************************************************/
 /**************                                                                                      **/
 
-#if 0
-TVFSFileDes VFSOpenFile(struct TVFSGlobs *globs, const char *APath, int Mode, int *Error)
-{
-  *Error = cVFS_Not_Supported;
-  return (TVFSFileDes)0;
-}
-
-TVFSResult VFSCloseFile(struct TVFSGlobs *globs, TVFSFileDes FileDescriptor)
-{
-  return cVFS_Not_Supported;
-}
-
-u_int64_t VFSFileSeek(struct TVFSGlobs *globs, TVFSFileDes FileDescriptor, u_int64_t AbsoluteOffset, int *Error)
-{
-  *Error = cVFS_Not_Supported;
-  return 0;
-}
-
-int VFSReadFile(struct TVFSGlobs *globs, TVFSFileDes FileDescriptor, void *Buffer, int ABlockSize, int *Error)
-{
-  *Error = cVFS_Not_Supported;
-  return 0;
-}
-
-int VFSWriteFile(struct TVFSGlobs *globs, TVFSFileDes FileDescriptor, void *Buffer, int BytesCount, int *Error)
-{
-  *Error = cVFS_Not_Supported;
-  return 0;
-}
-#endif
-
 void
 VFSSetBlockSize (struct TVFSGlobs *globs, guint32 Value)
 {
@@ -790,76 +759,74 @@ VFSStopCopyOperation (struct TVFSGlobs *globs, GError **error)
   return TRUE;
 }
 
-
-gboolean
-VFSCopyToLocal (struct TVFSGlobs *globs, const char *sSrcName, const char *sDstName, gboolean Append, GError **error)
+static struct archive_entry *
+seek_to_archive_record (struct TVFSGlobs *globs, const char *sSrcName, const char *log_prefix, GError **error)
 {
   struct PathTree *node;
   const char *src;
-  struct archive_entry *entry;
   int r;
-  gboolean found;
-  gboolean res;
-
-
-  if (globs->op_archive == NULL) {
-    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_EXCEPTION, "globs->op_archive == NULL");
-    return FALSE;
-  }
-  if (sSrcName == NULL || sDstName == NULL || strlen (sSrcName) < 1 || strlen (sDstName) < 1) {
-    log_error ("VFSCopyToLocal: The value of 'sSrcName' or 'sDstName' is NULL or empty");
-    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_EXCEPTION, "The value of 'sSrcName' or 'sDstName' is NULL or empty.");
-    return FALSE;
-  }
-
-  log_notice ("VFSCopyToLocal: copying file '%s' out to '%s'", sSrcName, sDstName);
 
   node = filelist_tree_find_node_by_path (globs->files, sSrcName);
   if (! node) {
-    log_error ("VFSCopyToLocal: cannot find file '%s'", sSrcName);
-    g_set_error (error, TUXCMD_ERROR, TUXCMD_ERROR_SOURCE_OPEN, "Cannot find file '%s'", sSrcName);
-    return FALSE;
+    log_error ("%s: cannot find file '%s'", log_prefix, sSrcName);
+    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_SOURCE_OPEN, "File not found in the archive.");
+    return NULL;
   }
 
   src = node->original_pathstr;
   if (! src) {
-    log_warn ("VFSCopyToLocal: cannot determine original filename");
+    log_warn ("%s: cannot determine original filename", log_prefix);
     src = sSrcName;
   }
-  log_debug ("VFSCopyToLocal: new src path: '%s'", src);
-
-
-  found = FALSE;
-  res = TRUE;
+  log_debug ("%s: new src path: '%s'", log_prefix, src);
 
   for (;;) {
-    entry = NULL;
+    struct archive_entry *entry = NULL;
+
     r = archive_read_next_header (globs->op_archive, &entry);
     if (r == ARCHIVE_EOF) {
       break;
     } else
     if (r == ARCHIVE_WARN) {
-      log_warn ("VFSCopyToLocal: file '%s' - libarchive warning: '%s'", archive_entry_pathname (entry), archive_error_string (globs->op_archive));
+      log_warn ("%s: file '%s' - libarchive warning: '%s'", log_prefix, archive_entry_pathname (entry), archive_error_string (globs->op_archive));
     } else
     if (r != ARCHIVE_OK) {
-      log_error ("VFSCopyToLocal: error occured while reading archive: '%s'", archive_error_string (globs->op_archive));
+      log_error ("%s: error occured while reading archive: '%s'", log_prefix, archive_error_string (globs->op_archive));
       g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_SOURCE_READ, archive_error_string (globs->op_archive));
-      break;
+      return NULL;
     }
 
-    if (g_strcmp0 (src, archive_entry_pathname (entry)) == 0) {
-      found = TRUE;
-      res = my_archive_read_data_into_fd (globs, globs->op_archive, entry, sDstName, globs->block_size, Append, error);
-      break;
-    }
+    if (g_strcmp0 (src, archive_entry_pathname (entry)) == 0)
+      return entry;
   }
 
-  if (! found && res) {
-    log_error ("VFSCopyToLocal: file not found in the archive.");
-    if (error && *error == NULL)
-      g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_SOURCE_OPEN, "File not found in the archive.");
-    res = FALSE;
+  log_error ("%s: file not found in the archive.", log_prefix);
+  g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_SOURCE_OPEN, "File not found in the archive.");
+  return NULL;
+}
+
+gboolean
+VFSCopyToLocal (struct TVFSGlobs *globs, const char *sSrcName, const char *sDstName, gboolean Append, GError **error)
+{
+  struct archive_entry *entry;
+  gboolean res;
+
+  if (globs->op_archive == NULL) {
+    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_EXCEPTION, "globs->op_archive == NULL");
+    return FALSE;
   }
+  if (sSrcName == NULL || sDstName == NULL || strlen (sSrcName) < 1 || strlen (sDstName) < 1) {
+    log_error ("VFSCopyToLocal: The value of 'sSrcName' or 'sDstName' is NULL or empty");
+    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_EXCEPTION, "The value of 'sSrcName' or 'sDstName' is NULL or empty.");
+    return FALSE;
+  }
+
+  log_notice ("VFSCopyToLocal: copying file '%s' out to '%s'", sSrcName, sDstName);
+  entry = seek_to_archive_record (globs, sSrcName, "VFSCopyToLocal", error);
+  if (!entry)
+    return FALSE;
+
+  res = my_archive_read_data_into_fd (globs, globs->op_archive, entry, sDstName, globs->block_size, Append, error);
 
   log_debug ("VFSCopyToLocal: finished.");
   return res;
@@ -875,6 +842,87 @@ VFSCopyFromLocal (struct TVFSGlobs *globs, const char *sSrcName, const char *sDs
 }
 
 
+/******************************************************************************************************/
+/**************                                                                                      **/
+
+TVFSFileDes
+VFSOpenFile (struct TVFSGlobs *globs, const char *APath, int Mode, GError **error)
+{
+  struct archive_entry *entry;
+  GError *local_error = NULL;
+
+  switch (Mode) {
+    case cVFS_OpenRead:
+      /* OK, break */
+      break;
+    case cVFS_OpenWrite:
+    case cVFS_OpenAppend:
+      g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_OPEN_FILE, "Writing files in the archive is not supported");
+      return NULL;
+    default:
+      g_set_error (error, TUXCMD_ERROR, TUXCMD_ERROR_OPEN_FILE, "Invalid file open mode %d", Mode);
+      return NULL;
+  }
+
+  /* FIXME: fix the use outside of running copy operation (archive might not have been opened) */
+  if (globs->op_archive == NULL) {
+    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_EXCEPTION, "globs->op_archive == NULL");
+    return FALSE;
+  }
+
+  entry = seek_to_archive_record (globs, APath, "VFSCopyToLocal", &local_error);
+  if (!entry) {
+    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_OPEN_FILE, local_error->message);
+    g_error_free (local_error);
+    return NULL;
+  }
+
+  return globs->op_archive;  /* FIXME: what to use as a filedescriptor? */
+}
+
+gboolean
+VFSCloseFile (struct TVFSGlobs *globs, TVFSFileDes FileDescriptor, GError **error)
+{
+  /* nothing special to do here */
+  return TRUE;
+}
+
+gint64
+VFSReadFile (struct TVFSGlobs *globs, TVFSFileDes FileDescriptor, gpointer Buffer, guint64 ABlockSize, GError **error)
+{
+  la_ssize_t r;
+
+  r = archive_read_data (FileDescriptor, Buffer, ABlockSize);
+  /* On error, a value of ARCHIVE_FATAL = -30, ARCHIVE_WARN = -20, or ARCHIVE_RETRY = -10 is returned. */
+  if (r < 0) {
+    log_error ("VFSReadFile: error reading data from the archive: %s", archive_error_string (FileDescriptor));
+    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_READ_FILE, archive_error_string (FileDescriptor));
+    return -1;
+  }
+  return r;
+}
+
+gint64
+VFSWriteFile (struct TVFSGlobs *globs, TVFSFileDes FileDescriptor, gpointer Buffer, guint64 BytesCount, GError **error)
+{
+  g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_WRITE_FILE, "Writing files in the archive is not supported");
+  return -1;
+}
+
+guint64
+VFSFileSeek (struct TVFSGlobs *globs, TVFSFileDes FileDescriptor, guint64 AbsoluteOffset, GError **error)
+{
+  la_int64_t r;
+
+  r = archive_seek_data (FileDescriptor, AbsoluteOffset, SEEK_SET);
+  if (r < 0) {
+    log_error ("VFSFileSeek: error seeking in the archive: %s", archive_error_string (FileDescriptor));
+    g_set_error_literal (error, TUXCMD_ERROR, TUXCMD_ERROR_SEEK, archive_error_string (FileDescriptor));
+    return 0;
+  }
+  return r;
+}
+
 
 
 /**********