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/*
* videodir.c: Functions to maintain a distributed video directory
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: videodir.c 1.7 2002/01/27 12:37:26 kls Exp $
*/
#include "videodir.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "tools.h"
const char *VideoDirectory = "/video";
class cVideoDirectory {
private:
char *name, *stored, *adjusted;
int length, number, digits;
public:
cVideoDirectory(void);
~cVideoDirectory();
int FreeMB(int *UsedMB = NULL);
const char *Name(void) { return name ? name : VideoDirectory; }
const char *Stored(void) { return stored; }
int Length(void) { return length; }
bool IsDistributed(void) { return name != NULL; }
bool Next(void);
void Store(void);
const char *Adjust(const char *FileName);
};
cVideoDirectory::cVideoDirectory(void)
{
length = strlen(VideoDirectory);
name = (VideoDirectory[length - 1] == '0') ? strdup(VideoDirectory) : NULL;
stored = adjusted = NULL;
number = -1;
digits = 0;
}
cVideoDirectory::~cVideoDirectory()
{
delete name;
delete stored;
delete adjusted;
}
int cVideoDirectory::FreeMB(int *UsedMB)
{
return FreeDiskSpaceMB(name ? name : VideoDirectory, UsedMB);
}
bool cVideoDirectory::Next(void)
{
if (name) {
if (number < 0) {
int l = length;
while (l-- > 0 && isdigit(name[l]))
;
l++;
digits = length - l;
int n = atoi(&name[l]);
if (n == 0)
number = n;
else
return false; // base video directory must end with zero
}
if (++number > 0) {
char buf[16];
if (sprintf(buf, "%0*d", digits, number) == digits) {
strcpy(&name[length - digits], buf);
return DirectoryOk(name);
}
}
}
return false;
}
void cVideoDirectory::Store(void)
{
if (name) {
delete stored;
stored = strdup(name);
}
}
const char *cVideoDirectory::Adjust(const char *FileName)
{
if (stored) {
delete adjusted;
adjusted = strdup(FileName);
return strncpy(adjusted, stored, length);
}
return NULL;
}
int OpenVideoFile(const char *FileName, int Flags)
{
const char *ActualFileName = FileName;
// Incoming name must be in base video directory:
if (strstr(FileName, VideoDirectory) != FileName) {
esyslog(LOG_ERR, "ERROR: %s not in %s", FileName, VideoDirectory);
errno = ENOENT; // must set 'errno' - any ideas for a better value?
return -1;
}
// Are we going to create a new file?
if ((Flags & O_CREAT) != 0) {
cVideoDirectory Dir;
if (Dir.IsDistributed()) {
// Find the directory with the most free space:
int MaxFree = Dir.FreeMB();
while (Dir.Next()) {
int Free = FreeDiskSpaceMB(Dir.Name());
if (Free > MaxFree) {
Dir.Store();
MaxFree = Free;
}
}
if (Dir.Stored()) {
ActualFileName = Dir.Adjust(FileName);
if (!MakeDirs(ActualFileName, false))
return -1; // errno has been set by MakeDirs()
if (symlink(ActualFileName, FileName) < 0) {
LOG_ERROR_STR(FileName);
return -1;
}
ActualFileName = strdup(ActualFileName); // must survive Dir!
}
}
}
int Result = open(ActualFileName, Flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (ActualFileName != FileName)
delete ActualFileName;
return Result;
}
int CloseVideoFile(int FileHandle)
{
// just in case we ever decide to do something special when closing the file!
return close(FileHandle);
}
bool RenameVideoFile(const char *OldName, const char *NewName)
{
// Only the base video directory entry will be renamed, leaving the
// possible symlinks untouched. Going through all the symlinks and disks
// would be unnecessary work - maybe later...
if (rename(OldName, NewName) == -1) {
LOG_ERROR_STR(OldName);
return false;
}
return true;
}
bool RemoveVideoFile(const char *FileName)
{
return RemoveFileOrDir(FileName, true);
}
bool VideoFileSpaceAvailable(int SizeMB)
{
cVideoDirectory Dir;
if (Dir.IsDistributed()) {
if (Dir.FreeMB() >= SizeMB * 2) // base directory needs additional space
return true;
while (Dir.Next()) {
if (Dir.FreeMB() >= SizeMB)
return true;
}
return false;
}
return Dir.FreeMB() >= SizeMB;
}
int VideoDiskSpace(int *FreeMB, int *UsedMB)
{
int free = 0, used = 0;
cVideoDirectory Dir;
do {
int u;
free += Dir.FreeMB(&u);
used += u;
} while (Dir.Next());
if (FreeMB)
*FreeMB = free;
if (UsedMB)
*UsedMB = used;
return (free + used) ? used * 100 / (free + used) : 0;
}
const char *PrefixVideoFileName(const char *FileName, char Prefix)
{
static char *PrefixedName = NULL;
if (!PrefixedName || strlen(PrefixedName) <= strlen(FileName))
PrefixedName = (char *)realloc(PrefixedName, strlen(FileName) + 2);
if (PrefixedName) {
const char *p = FileName + strlen(FileName); // p points at the terminating 0
int n = 2;
while (p-- > FileName && n > 0) {
if (*p == '/') {
if (--n == 0) {
int l = p - FileName + 1;
strncpy(PrefixedName, FileName, l);
PrefixedName[l] = Prefix;
strcpy(PrefixedName + l + 1, p + 1);
return PrefixedName;
}
}
}
}
return NULL;
}
void RemoveEmptyVideoDirectories(void)
{
cVideoDirectory Dir;
do {
RemoveEmptyDirectories(Dir.Name());
} while (Dir.Next());
}
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