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/*================================================================
* cmpopen.c:
* search / open a compressed file
*
* Copyright (C) 1996-1999 Takashi Iwai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*================================================================*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
typedef struct _DecompRec {
char *ext;
char *format;
} DecompRec;
typedef struct _DecompList {
DecompRec v;
struct _DecompList *next;
} DecompList;
static DecompRec declist[] = {
{".gz", "gunzip -c"},
{".z", "gunzip -c"},
{".Z", "zcat"},
{".zip", "unzip -p"},
{".lha", "lha -pq"},
{".lzh", "lha -pq"},
{".bz2", "bzip2 -d -c"},
};
static DecompList *decopts = NULL;
void CmpAddList(char *ext, char *format)
{
DecompList *rec;
rec = (DecompList*)safe_malloc(sizeof(DecompList));
if (*ext != '.') {
rec->v.ext = (char*)safe_malloc(strlen(ext) + 2);
rec->v.ext[0] = '.';
strcpy(rec->v.ext + 1, ext);
} else
rec->v.ext = safe_strdup(ext);
rec->v.format = safe_strdup(format);
rec->next = decopts;
decopts = rec;
}
static int CheckExt(char *name, int len, DecompRec *p)
{
int exlen = strlen(p->ext);
if (len > exlen && strcmp(name + (len - exlen), p->ext) == 0)
return TRUE;
else
return FALSE;
}
static DecompRec *CmpSearchFile(char *name)
{
int i, len;
DecompList *p;
if (access(name, R_OK) != 0)
return NULL;
len = strlen(name);
for (p = decopts; p; p = p->next) {
if (CheckExt(name, len, &p->v))
return &p->v;
}
for (i = 0; i < numberof(declist); i++) {
if (CheckExt(name, len, &declist[i]))
return &declist[i];
}
return NULL;
}
char *CmpGetExtension(char *name)
{
DecompRec *rec;
if ((rec = CmpSearchFile(name)) != NULL) {
return name + strlen(name) - strlen(rec->ext);
}
return strrchr(name, '.');
}
FILE *CmpOpenFile(char *name, int *flag)
{
FILE *fp;
DecompRec *rec;
char str[256];
*flag = 0;
if (strcmp(name, "-") == 0) {
/* use standard input */
*flag = 2;
return stdin;
}
if ((rec = CmpSearchFile(name)) != NULL) {
if (strstr(rec->format, "%s") != NULL)
sprintf(str, rec->format, name);
else
sprintf(str, "%s \"%s\"", rec->format, name);
if ((fp = popen(str, "r")) != NULL) {
*flag = 1;
return fp;
}
}
return fopen(name, "r");
}
void CmpCloseFile(FILE *fp, int flag)
{
switch (flag) {
case 0:
fclose(fp); break;
case 1:
pclose(fp); break;
}
}
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