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- /*
- * hfsutils - tools for reading and writing Macintosh HFS volumes
- * Copyright (C) 1996, 1997 Robert Leslie
- *
- * 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 <mconfig.h>
- #include <strdefs.h>
- #include <time.h>
-
- #include "internal.h"
- #include "data.h"
- #include "btree.h"
-
- #define MUTDIFF 2082844800L
- #define TZNONE 0x0FFFFFFFL /* A timezone diff that cannot occur */
-
- static void calctzdiff __PR((void));
-
- static
- unsigned long tzdiff = TZNONE;
-
- unsigned char hfs_charorder[256] = {
- 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
- 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
- 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
- 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
-
- 0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
- 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
- 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
- 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
-
- 0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
- 0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
- 0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
- 0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae,
-
- 0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
- 0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
- 0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
- 0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
-
- 0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55,
- 0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64,
- 0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89,
- 0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a,
-
- 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95,
- 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85,
- 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
- 0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85,
-
- 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26,
- 0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87,
- 0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8,
- 0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
-
- 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
- 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
- 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
- 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
- };
-
- /*
- * NAME: data->getb()
- * DESCRIPTION: marshal 1 byte into local host format
- */
- char d_getb(ptr)
- unsigned char *ptr;
- {
- return (char) ptr[0];
- }
-
- /*
- * NAME: data->getw()
- * DESCRIPTION: marshal 2 bytes into local host format
- */
- short d_getw(ptr)
- unsigned char *ptr;
- {
- return (short)
- ((ptr[0] << 8) |
- (ptr[1] << 0));
- }
-
- /*
- * NAME: data->getl()
- * DESCRIPTION: marshal 4 bytes into local host format
- */
- long d_getl(ptr)
- unsigned char *ptr;
- {
- return (long)
- ((ptr[0] << 24) |
- (ptr[1] << 16) |
- (ptr[2] << 8) |
- (ptr[3] << 0));
- }
-
- /*
- * NAME: data->putb()
- * DESCRIPTION: marshal 1 byte out to Macintosh (big-endian) format
- */
- #ifdef PROTOTYPES
- void d_putb(unsigned char *ptr, char data)
- #else
- void d_putb(ptr, data)
- unsigned char *ptr;
- char data;
- #endif
- {
- ptr[0] = (unsigned char) data;
- }
-
- /*
- * NAME: data->putw()
- * DESCRIPTION: marshal 2 bytes out to Macintosh (big-endian) format
- */
- #ifdef PROTOTYPES
- void d_putw(unsigned char *ptr, short data)
- #else
- void d_putw(ptr, data)
- unsigned char *ptr;
- short data;
- #endif
- {
- ptr[0] = ((unsigned short) data & 0xff00) >> 8;
- ptr[1] = ((unsigned short) data & 0x00ff) >> 0;
- }
-
- /*
- * NAME: data->putl()
- * DESCRIPTION: marshal 4 bytes out to Macintosh (big-endian) format
- */
- void d_putl(ptr, data)
- unsigned char *ptr;
- long data;
- {
- ptr[0] = ((unsigned long) data & 0xff000000) >> 24;
- ptr[1] = ((unsigned long) data & 0x00ff0000) >> 16;
- ptr[2] = ((unsigned long) data & 0x0000ff00) >> 8;
- ptr[3] = ((unsigned long) data & 0x000000ff) >> 0;
- }
-
- /*
- * NAME: data->fetchb()
- * DESCRIPTION: incrementally retrieve a byte of data
- */
- void d_fetchb(ptr, dest)
- unsigned char **ptr;
- char *dest;
- {
- *dest = d_getb(*ptr);
- *ptr += 1;
- }
-
- /*
- * NAME: data->fetchw()
- * DESCRIPTION: incrementally retrieve a word of data
- */
- void d_fetchw(ptr, dest)
- unsigned char **ptr;
- short *dest;
- {
- *dest = d_getw(*ptr);
- *ptr += 2;
- }
-
- /*
- * NAME: data->fetchl()
- * DESCRIPTION: incrementally retrieve a long word of data
- */
- void d_fetchl(ptr, dest)
- unsigned char **ptr;
- long *dest;
- {
- *dest = d_getl(*ptr);
- *ptr += 4;
- }
-
- /*
- * NAME: data->fetchs()
- * DESCRIPTION: incrementally retrieve a string
- */
- void d_fetchs(ptr, dest, size)
- unsigned char **ptr;
- char *dest;
- int size;
- {
- int len;
- char blen;
-
- d_fetchb(ptr, &blen);
- len = blen;
-
- if (len > 0 && len < size)
- memcpy(dest, *ptr, len);
- else
- len = 0;
-
- dest[len] = 0;
-
- *ptr += size - 1;
- }
-
- /*
- * NAME: data->storeb()
- * DESCRIPTION: incrementally store a byte of data
- */
- #ifdef PROTOTYPES
- void d_storeb(unsigned char **ptr, char data)
- #else
- void d_storeb(ptr, data)
- unsigned char **ptr;
- char data;
- #endif
- {
- d_putb(*ptr, data);
- *ptr += 1;
- }
-
- /*
- * NAME: data->storew()
- * DESCRIPTION: incrementally store a word of data
- */
- #ifdef PROTOTYPES
- void d_storew(unsigned char **ptr, short data)
- #else
- void d_storew(ptr, data)
- unsigned char **ptr;
- short data;
- #endif
- {
- d_putw(*ptr, data);
- *ptr += 2;
- }
-
- /*
- * NAME: data->storel()
- * DESCRIPTION: incrementally store a long word of data
- */
- void d_storel(ptr, data)
- unsigned char **ptr;
- long data;
- {
- d_putl(*ptr, data);
- *ptr += 4;
- }
-
- /*
- * NAME: data->stores()
- * DESCRIPTION: incrementally store a string
- */
- void d_stores(ptr, src, size)
- unsigned char **ptr;
- char *src;
- int size;
- {
- int len;
-
- len = strlen(src);
- if (len > --size)
- len = 0;
-
- d_storeb(ptr, (unsigned char) len);
-
- memcpy(*ptr, src, len);
- memset(*ptr + len, 0, size - len);
-
- *ptr += size;
- }
-
- /*
- * NAME: calctzdiff()
- * DESCRIPTION: calculate the timezone difference between local time and UTC
- */
- static
- void calctzdiff()
- {
- time_t t;
- int isdst;
- struct tm tm, *tmp;
-
- time(&t);
- isdst = localtime(&t)->tm_isdst;
-
- tmp = gmtime(&t);
- if (tmp)
- {
- tm = *tmp;
- tm.tm_isdst = isdst;
-
- tzdiff = t - mktime(&tm);
- }
- else
- tzdiff = 0;
- }
-
- /*
- * NAME: data->tomtime()
- * DESCRIPTION: convert UNIX time to Macintosh time
- */
- unsigned long d_tomtime(secs)
- unsigned long secs;
- {
- time_t utime = secs;
-
- if (tzdiff == TZNONE)
- calctzdiff();
-
- return utime + tzdiff + MUTDIFF;
- }
-
- /*
- * NAME: data->toutime()
- * DESCRIPTION: convert Macintosh time to UNIX time
- */
- unsigned long d_toutime(secs)
- unsigned long secs;
- {
- time_t utime = secs;
-
- if (tzdiff == TZNONE)
- calctzdiff();
-
- return utime - MUTDIFF - tzdiff;
- }
-
- /*
- * NAME: data->relstring()
- * DESCRIPTION: compare two strings as per MacOS for HFS
- */
- int d_relstring(str1, str2)
- char *str1;
- char *str2;
- {
- int diff;
-
- while (*str1 && *str2)
- {
- diff = hfs_charorder[(unsigned char) *str1] -
- hfs_charorder[(unsigned char) *str2];
-
- if (diff)
- return diff;
-
- ++str1, ++str2;
- }
-
- if (! *str1 && *str2)
- return -1;
- else if (*str1 && ! *str2)
- return 1;
-
- return 0;
- }
-