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Aminet 13
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Aminet 13 - August 1996.iso
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generic.c
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C/C++ Source or Header
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1994-11-03
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9KB
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375 lines
/* generic.c:
*
* Generic interface to the protocol handlers.
*
* ----------------------------------------------------------------------
* This code is (C) Copyright 1993,1994 by Frank Munkert.
* All rights reserved.
* This software may be freely distributed and redistributed for
* non-commercial purposes, provided this notice is included.
* ----------------------------------------------------------------------
* History:
*
* 22-May-94 fmu Performance improvement for lock+filehandle processing.
* 01-Jan-94 fmu Added multisession support.
* 29-Nov-93 fmu New function Block_Size().
* 15-Nov-93 fmu Missing return value for 'Location' inserted.
* 10-Nov-93 fmu Added HFS/ISO-9660-lookup reversing in Which_Protocol.
*/
#include <stdlib.h>
#include <string.h>
#include <exec/types.h>
#include <exec/memory.h>
#include <clib/exec_protos.h>
#include <clib/utility_protos.h>
#ifdef LATTICE
#include <pragmas/exec_pragmas.h>
#include <pragmas/utility_pragmas.h>
extern struct Library *UtilityBase;
extern struct ExecBase *SysBase;
#endif
#include "cdrom.h"
#include "generic.h"
#include "iso9660.h"
#include "rock.h"
#include "hfs.h"
#include "params.h"
#define HAN(vol,func) (*(vol)->handler->func)
#define HANX(vol,func) ((vol)->handler->func)
t_bool g_hfs_first = FALSE;
/* Strncasecmp works like 'strncmp' but ignores case differences.
*/
int Strncasecmp (char *p_str1, char *p_str2, int p_length)
{
int i;
int len = 0;
while (len < p_length && *p_str1 && *p_str2) {
if (i = ToLower (*p_str1++) - ToLower (*p_str2++))
return i;
len++;
}
return (len == p_length) ? 0 : ToLower (*p_str1) - ToLower (*p_str2);
}
/* WhichProtocol - examines which protocol is used.
*
* Input Variables:
* p_cdrom - CDROM descriptor
* p_use_rock_ridge - flag for the ROCKRIDGE startup option
*
* Output Variables:
* p_skip - skip length for RockRidge disks
* p_offset - block offset of last session for multisession disks (ISO only)
*
* Result:
* PRO_ISO, PRO_HIGH_SIERRA, PRO_RR, PRO_HFS or PRO_UNKNOWN.
*/
t_protocol Which_Protocol (CDROM *p_cdrom, t_bool p_use_rock_ridge, int *p_skip,
t_ulong *p_offset)
{
if (p_cdrom->model == MODEL_TOSHIBA_3401) {
if (Is_XA_Mode_Disk (p_cdrom))
Mode_Select (p_cdrom, 0x81, 2048);
else
Mode_Select (p_cdrom, 0x00, 2048);
}
if (g_hfs_first && Uses_HFS_Protocol (p_cdrom, p_skip))
return PRO_HFS;
if (Uses_Iso_Protocol (p_cdrom, p_offset)) {
if (p_use_rock_ridge) {
VOLUME tmp_vol; /* temporary volume descriptor */
t_bool rr;
tmp_vol.cd = p_cdrom;
tmp_vol.protocol = PRO_ISO;
Iso_Init_Vol_Info (&tmp_vol, 0, *p_offset);
rr = Uses_Rock_Ridge_Protocol (&tmp_vol, p_skip);
HAN (&tmp_vol, close_vol_info) (&tmp_vol);
return rr ? PRO_ROCK : PRO_ISO;
} else
return PRO_ISO;
}
if (Uses_High_Sierra_Protocol (p_cdrom))
return PRO_HIGH_SIERRA;
if (!g_hfs_first && Uses_HFS_Protocol (p_cdrom, p_skip))
return PRO_HFS;
return PRO_UNKNOWN;
}
VOLUME *Open_Volume (CDROM *p_cdrom, t_bool p_use_rock_ridge)
{
VOLUME *res;
int skip;
t_ulong offset;
res = AllocMem (sizeof (VOLUME), MEMF_PUBLIC);
if (!res) {
iso_errno = ISOERR_NO_MEMORY;
return NULL;
}
res->cd = p_cdrom;
res->locks = 0; /* may be modified by application program */
res->file_handles = 0; /* may be modified by application program */
res->protocol = Which_Protocol (p_cdrom, p_use_rock_ridge, &skip, &offset);
if (res->protocol == PRO_UNKNOWN) {
/* give it a second try: */
res->protocol = Which_Protocol (p_cdrom, p_use_rock_ridge, &skip, &offset);
}
switch (res->protocol) {
case PRO_ROCK:
case PRO_ISO:
if (!Iso_Init_Vol_Info (res, skip, offset)) {
FreeMem (res, sizeof (VOLUME));
return NULL;
}
break;
case PRO_HFS:
if (!HFS_Init_Vol_Info (res, skip)) {
FreeMem (res, sizeof (VOLUME));
return NULL;
}
break;
default:
FreeMem (res, sizeof (VOLUME));
return NULL;
}
return res;
}
void Close_Volume (VOLUME *p_volume)
{
HAN(p_volume, close_vol_info)(p_volume);
FreeMem (p_volume, sizeof (VOLUME));
}
CDROM_OBJ *Open_Top_Level_Directory (VOLUME *p_volume)
{
CDROM_OBJ * result = HAN(p_volume, open_top_level_directory)(p_volume);
if (result)
result->pathlist = NULL;
return result;
}
CDROM_OBJ *Open_Object (CDROM_OBJ *p_current_dir, char *p_path_name)
{
char *cp = p_path_name;
CDROM_OBJ *obj, *new;
VOLUME *vol = p_current_dir->volume;
char *np;
char name[100];
if (*cp == ':') {
obj = HAN(vol, open_top_level_directory)(p_current_dir->volume);
if (obj)
obj->pathlist = NULL;
cp++;
} else {
obj = Clone_Object (p_current_dir);
if (!obj) {
iso_errno = ISOERR_NO_MEMORY;
return NULL;
}
while (*cp == '/') {
new = HAN(vol, find_parent)(obj);
if (!new)
return NULL;
new->pathlist = Copy_Path_List (obj->pathlist, TRUE);
Close_Object (obj);
obj = new;
cp++;
}
}
while (*cp) {
for (np = name; *cp && *cp != '/'; )
*np++ = *cp++;
*np = 0;
if (*cp)
cp++;
if (new = HAN(vol, open_obj_in_directory)(obj, name)) {
new->pathlist = Append_Path_List (obj->pathlist, name);
Close_Object (obj);
if (*cp && new->symlink_f) {
HAN(vol, close_obj)(new);
iso_errno = ISOERR_IS_SYMLINK;
return NULL;
}
if (*cp && !new->directory_f) {
HAN(vol, close_obj)(new);
iso_errno = ISOERR_NOT_FOUND;
return NULL;
}
obj = new;
} else {
Close_Object (obj);
return NULL;
}
}
return obj;
}
void Close_Object (CDROM_OBJ *p_object)
{
Free_Path_List (p_object->pathlist);
HAN(p_object->volume, close_obj)(p_object);
}
int Read_From_File (CDROM_OBJ *p_file, char *p_buffer, int p_buffer_length)
{
return HAN(p_file->volume, read_from_file)(p_file, p_buffer, p_buffer_length);
}
int CDROM_Info (CDROM_OBJ *p_obj, CDROM_INFO *p_info)
{
return HAN(p_obj->volume, cdrom_info)(p_obj, p_info);
}
t_bool Examine_Next (CDROM_OBJ *p_dir, CDROM_INFO *p_info, unsigned long *p_offset)
{
return HAN(p_dir->volume, examine_next)(p_dir, p_info, p_offset);
}
CDROM_OBJ *Clone_Object (CDROM_OBJ *p_object)
{
CDROM_OBJ *new = AllocMem (sizeof (CDROM_OBJ), MEMF_PUBLIC);
if (!new)
return NULL;
memcpy (new, p_object, sizeof (CDROM_OBJ));
new->obj_info = HAN(p_object->volume,clone_obj_info)(p_object->obj_info);
if (!new->obj_info) {
FreeMem (new, sizeof (CDROM_OBJ));
return NULL;
}
new->pathlist = Copy_Path_List (p_object->pathlist, FALSE);
return new;
}
CDROM_OBJ *Find_Parent (CDROM_OBJ *p_object)
{
CDROM_OBJ *result = HAN(p_object->volume, find_parent)(p_object);
if (result)
result->pathlist = Copy_Path_List (p_object->pathlist, TRUE);
return result;
}
t_bool Is_Top_Level_Object (CDROM_OBJ *p_object)
{
return HAN(p_object->volume, is_top_level_obj)(p_object);
}
t_bool Same_Objects (CDROM_OBJ *p_object1, CDROM_OBJ *p_object2)
{
if (p_object1->volume != p_object2->volume)
return 0;
return HAN(p_object1->volume, same_objects)(p_object1, p_object2);
}
t_ulong Volume_Creation_Date (VOLUME *p_volume)
{
if (!HANX(p_volume, creation_date))
return 0;
return HAN(p_volume, creation_date)(p_volume);
}
t_ulong Volume_Size (VOLUME *p_volume)
{
return HAN(p_volume, volume_size)(p_volume);
}
t_ulong Block_Size (VOLUME *p_volume)
{
return HAN(p_volume, block_size)(p_volume);
}
void Volume_ID (VOLUME *p_volume, char *p_buffer, int p_buf_length)
{
HAN(p_volume, volume_id)(p_volume, p_buffer, p_buf_length);
}
t_ulong Location (CDROM_OBJ *p_object)
{
return HAN(p_object->volume, location)(p_object);
}
/* Find a position in a file.
*/
int Seek_Position (CDROM_OBJ *p_object, long p_offset, int p_mode)
{
t_ulong new_pos;
t_ulong max_len = HAN(p_object->volume, file_length)(p_object);
if (p_object->directory_f) {
iso_errno = ISOERR_BAD_ARGUMENTS;
return 0;
}
switch (p_mode) {
case SEEK_FROM_START:
if (p_offset < 0 || p_offset > max_len) {
iso_errno = ISOERR_OFF_BOUNDS;
return 0;
}
new_pos = p_offset;
break;
case SEEK_FROM_CURRENT_POS:
if ((p_offset < 0 && -p_offset > p_object->pos) ||
(p_offset > 0 && p_object->pos + p_offset > max_len)) {
iso_errno = ISOERR_OFF_BOUNDS;
return 0;
}
new_pos = p_object->pos + p_offset;
break;
case SEEK_FROM_END:
if (p_offset > 0 || -p_offset > max_len) {
iso_errno = ISOERR_OFF_BOUNDS;
return 0;
}
new_pos = max_len + p_offset;
break;
default:
iso_errno = ISOERR_BAD_ARGUMENTS;
return 0;
}
p_object->pos = new_pos;
return 1;
}
/* Find path name of an object:
*
*/
int Full_Path_Name (CDROM_OBJ *p_obj, char *p_buf, int p_buf_length)
{
return Path_Name_From_Path_List (p_obj->pathlist, p_buf, p_buf_length);
}