src/BeOS/extfs_beos.cpp

/*
 *  extfs_beos.cpp - MacOS file system for access native file system access, BeOS specific stuff
 *
 *  Basilisk II (C) 1997-1999 Christian Bauer
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>

#include <fs_attr.h>
#include <support/TypeConstants.h>
#include <storage/Mime.h>

#include "extfs.h"
#include "extfs_defs.h"

#define DEBUG 0
#include "debug.h"


// Default Finder flags
const uint16 DEFAULT_FINDER_FLAGS = kHasBeenInited;

// Temporary buffer for transfers from/to kernel space
const int TMP_BUF_SIZE = 0x10000;
static uint8 *tmp_buf = NULL;


/*
 *  Initialization
 */

void extfs_init(void)
{
        // Allocate temporary buffer
        tmp_buf = new uint8[TMP_BUF_SIZE];
}


/*
 *  Deinitialization
 */

void extfs_exit(void)
{
        // Delete temporary buffer
        delete[] tmp_buf;
}


/*
 *  Get/set finder type/creator for file specified by full path
 */

struct mime2type {
        const char *mime;
        uint32 type;
        uint32 creator;
        bool reversible;        // type -> mime translation possible
};

static const mime2type m2t_translation[] = {
        {"application/x-compress", 'ZIVM', 'LZIV', true},
        {"application/x-gzip", 'Gzip', 'Gzip', true},
        {"application/x-macbinary", 'BINA', '????', false},
        {"application/mac-binhex40", 'TEXT', 'SITx', false},
        {"application/pdf", 'PDF ', 'CARO', true},
        {"application/postscript", 'TEXT', 'ttxt', false},
        {"application/x-stuffit", 'SIT!', 'SITx', true},
        {"application/x-tar", 'TARF', 'TAR ', true},
        {"application/x-uuencode", 'TEXT', 'SITx', false},
        {"application/zip", 'ZIP ', 'ZIP ', true},
        {"audio/x-8svx", '8SVX', 'SNDM', true},
        {"audio/x-aifc", 'AIFC', 'TVOD', true},
        {"audio/x-aiff", 'AIFF', 'TVOD', true},
        {"audio/basic", 'ULAW', 'TVOD', true},
        {"audio/x-midi", 'MIDI', 'TVOD', true},
        {"audio/x-mpeg", 'MPG ', 'TVOD', true},
        {"audio/x-wav", 'WAVE', 'TVOD', true},
        {"image/x-bmp", 'BMPf', 'ogle', true},
        {"image/gif", 'GIFf', 'ogle', true},
        {"image/x-ilbm", 'ILBM', 'GKON', true},
        {"image/jpeg", 'JPEG', 'ogle', true},
        {"image/jpeg", 'JFIF', 'ogle', true},
        {"image/x-photoshop", '8BPS', '8BIM', true},
        {"image/pict", 'PICT', 'ogle', true},
        {"image/png", 'PNGf', 'ogle', true},
        {"image/x-sgi", '.SGI', 'ogle', true},
        {"image/x-targa", 'TPIC', 'ogle', true},
        {"image/tiff", 'TIFF', 'ogle', true},
        {"text/html", 'TEXT', 'MOSS', false},
        {"text/plain", 'TEXT', 'ttxt', true},
        {"text/rtf", 'TEXT', 'MSWD', false},
        {"text/x-source-code", 'TEXT', 'R*ch', false},
        {"video/mpeg", 'MPEG', 'TVOD', true},
        {"video/quicktime", 'MooV', 'TVOD', true},
        {"video/x-flc", 'FLI ', 'TVOD', true},
        {"video/x-msvideo", 'VfW ', 'TVOD', true},
        {NULL, 0, 0, false}     // End marker
};

void get_finder_type(const char *path, uint32 &type, uint32 &creator)
{
        type = 0;
        creator = 0;

        // Open file
        int fd = open(path, O_RDONLY);
        if (fd < 0)
                return;

        // Read BeOS MIME type and close file
        char mime[256];
        ssize_t actual = fs_read_attr(fd, "BEOS:TYPE", B_MIME_STRING_TYPE, 0, mime, 256);
        mime[255] = 0;

        if (actual > 0) {

                // Translate MIME type to MacOS type/creator
                char mactype[4];
                if (sscanf(mime, "application/x-MacOS-%c%c%c%c", mactype, mactype+1, mactype+2, mactype+3) == 4) {

                        // MacOS style type
                        memcpy(&type, mactype, 4);

                } else {

                        // MIME string, look in table
                        for (int i=0; m2t_translation[i].mime; i++) {
                                if (!strcmp(mime, m2t_translation[i].mime)) {
                                        type = m2t_translation[i].type;
                                        creator = m2t_translation[i].creator;
                                        break;
                                }
                        }
                }
        }

        // Override file type with MACOS:CREATOR attribute
        fs_read_attr(fd, "MACOS:CREATOR", B_UINT32_TYPE, 0, &creator, 4);

        // Close file
        close(fd);
}

void set_finder_type(const char *path, uint32 type, uint32 creator)
{
        // Open file
        int fd = open(path, O_WRONLY);
        if (fd < 0)
                return;

        // Set BEOS:TYPE attribute
        if (type) {
                bool written = false;
                for (int i=0; m2t_translation[i].mime; i++) {
                        if (m2t_translation[i].type == type && m2t_translation[i].reversible) {
                                fs_write_attr(fd, "BEOS:TYPE", B_MIME_STRING_TYPE, 0, m2t_translation[i].mime, strlen(m2t_translation[i].mime) + 1);
                                written = true;
                                break;
                        }
                }
                if (!written) {
                        char mime[256];
                        sprintf(mime, "application/x-MacOS-%c%c%c%c", type >> 24, type >> 16, type >> 8, type);
                        fs_write_attr(fd, "BEOS:TYPE", B_MIME_STRING_TYPE, 0, mime, strlen(mime) + 1);
                }
        }

        // Set MACOS:CREATOR attribute
        if (creator)
                fs_write_attr(fd, "MACOS:CREATOR", B_UINT32_TYPE, 0, &creator, 4);

        // Close file
        close(fd);
}


/*
 *  Get/set finder flags for file/dir specified by full path (MACOS:HFS_FLAGS attribute)
 */

void get_finder_flags(const char *path, uint16 &flags)
{
        flags = DEFAULT_FINDER_FLAGS;   // Default

        // Open file
        int fd = open(path, O_RDONLY);
        if (fd < 0)
                return;

        // Read MACOS:HFS_FLAGS attribute
        fs_read_attr(fd, "MACOS:HFS_FLAGS", B_UINT16_TYPE, 0, &flags, 2);

        // Close file
        close(fd);
}

void set_finder_flags(const char *path, uint16 flags)
{
        // Open file
        int fd = open(path, O_WRONLY);
        if (fd < 0)
                return;

        // Write MACOS:HFS_FLAGS attribute
        if (flags != DEFAULT_FINDER_FLAGS)
                fs_write_attr(fd, "MACOS:HFS_FLAGS", B_UINT16_TYPE, 0, &flags, 2);
        else
                fs_remove_attr(fd, "MACOS:HFS_FLAGS");

        // Close file
        close(fd);
}


/*
 *  Resource fork emulation functions
 */

uint32 get_rfork_size(const char *path)
{
        // Open file
        int fd = open(path, O_RDONLY);
        if (fd < 0)
                return 0;

        // Get size of MACOS:RFORK attribute
        struct attr_info info;
        if (fs_stat_attr(fd, "MACOS:RFORK", &info) < 0)
                info.size = 0;

        // Close file and return size
        close(fd);
        return info.size;
}

int open_rfork(const char *path, int flag)
{
        // Open original file
        int fd = open(path, flag);
        if (fd < 0)
                return -1;

        // Open temporary file for resource fork
        char rname[L_tmpnam];
        tmpnam(rname);
        int rfd = open(rname, O_RDWR | O_CREAT | O_TRUNC, 0664);
        if (rfd < 0) {
                close(fd);
                return -1;
        }
        unlink(rname);  // File will be deleted when closed

        // Get size of MACOS:RFORK attribute
        struct attr_info info;
        if (fs_stat_attr(fd, "MACOS:RFORK", &info) < 0)
                info.size = 0;

        // Copy resource data from attribute to temporary file
        if (info.size > 0) {

                // Allocate buffer
                void *buf = malloc(info.size);
                if (buf == NULL) {
                        close(rfd);
                        close(fd);
                        return -1;
                }

                // Copy data
                fs_read_attr(fd, "MACOS:RFORK", B_RAW_TYPE, 0, buf, info.size);
                write(rfd, buf, info.size);
                lseek(rfd, 0, SEEK_SET);

                // Free buffer
                if (buf)
                        free(buf);
        }

        // Close original file
        close(fd);
        return rfd;
}

void close_rfork(const char *path, int fd)
{
        if (fd < 0)
                return;

        // Get size of temporary file
        struct stat st;
        if (fstat(fd, &st) < 0)
                st.st_size = 0;

        // Open original file
        int ofd = open(path, O_WRONLY);
        if (ofd > 0) {

                // Copy resource data to MACOS:RFORK attribute
                if (st.st_size > 0) {

                        // Allocate buffer
                        void *buf = malloc(st.st_size);
                        if (buf == NULL) {
                                close(ofd);
                                close(fd);
                                return;
                        }

                        // Copy data
                        lseek(fd, 0, SEEK_SET);
                        read(fd, buf, st.st_size);
                        fs_write_attr(ofd, "MACOS:RFORK", B_RAW_TYPE, 0, buf, st.st_size);

                        // Free buffer
                        if (buf)
                                free(buf);

                } else
                        fs_remove_attr(ofd, "MACOS:RFORK");

                // Close original file
                close(ofd);
        }

        // Close temporary file
        close(fd);
}


/*
 *  Read "length" bytes from file to "buffer",
 *  returns number of bytes read (or 0)
 */

static inline ssize_t sread(int fd, void *buf, size_t count)
{
        ssize_t res;
        while ((res = read(fd, buf, count)) == B_INTERRUPTED) ;
        return res;
}

size_t extfs_read(int fd, void *buffer, size_t length)
{
        errno = 0;

        // Buffer in kernel space?
        size_t actual = 0;
        if ((uint32)buffer < 0x80000000) {

                // Yes, transfer via buffer
                while (length) {
                        size_t transfer_size = (length > TMP_BUF_SIZE) ? TMP_BUF_SIZE : length;
                        ssize_t res = sread(fd, tmp_buf, transfer_size);
                        if (res >= 0) {
                                memcpy(buffer, tmp_buf, res);
                                buffer = (void *)((uint8 *)buffer + res);
                                length -= res;
                                actual += res;
                        }
                        if (res != transfer_size)
                                return actual;
                }

        } else {

                // No, transfer directly
                actual = sread(fd, buffer, length);
                if (actual < 0)
                        actual = 0;
        }
        return actual;
}


/*
 *  Write "length" bytes from "buffer" to file,
 *  returns number of bytes written (or 0)
 */

static inline ssize_t swrite(int fd, void *buf, size_t count)
{
        ssize_t res;
        while ((res = write(fd, buf, count)) == B_INTERRUPTED) ;
        return res;
}

size_t extfs_write(int fd, void *buffer, size_t length)
{
        errno = 0;

        // Buffer in kernel space?
        size_t actual = 0;
        if ((uint32)buffer < 0x80000000) {

                // Yes, transfer via buffer
                while (length) {
                        size_t transfer_size = (length > TMP_BUF_SIZE) ? TMP_BUF_SIZE : length;
                        memcpy(tmp_buf, buffer, transfer_size);
                        ssize_t res = swrite(fd, tmp_buf, transfer_size);
                        if (res >= 0) {
                                buffer = (void *)((uint8 *)buffer + res);
                                length -= res;
                                actual += res;
                        }
                        if (res != transfer_size)
                                return actual;
                }

        } else {

                // No, transfer directly
                actual = swrite(fd, buffer, length);
                if (actual < 0)
                        actual = 0;
        }
        return actual;
}
Revision:	1.2
Committed:	1999-10-19T21:33:57Z (25 years, 1 month ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-21101999
Changes since 1.1:	+6 -1 lines
Log Message:	- fixed compilation problems on BeOS
#	User	Rev	Content
1	cebix	1.1	/*
2			* extfs_beos.cpp - MacOS file system for access native file system access, BeOS specific stuff
3			*
4			* Basilisk II (C) 1997-1999 Christian Bauer
5			*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21	cebix	1.2	#include "sysdeps.h"
22
23	cebix	1.1	#include <sys/types.h>
24			#include <sys/stat.h>
25	cebix	1.2	#include <string.h>
26	cebix	1.1	#include <stdio.h>
27			#include <stdlib.h>
28			#include <unistd.h>
29	cebix	1.2	#include <fcntl.h>
30	cebix	1.1	#include <dirent.h>
31			#include <errno.h>
32
33			#include <fs_attr.h>
34	cebix	1.2	#include <support/TypeConstants.h>
35			#include <storage/Mime.h>
36	cebix	1.1
37			#include "extfs.h"
38			#include "extfs_defs.h"
39
40			#define DEBUG 0
41			#include "debug.h"
42
43
44			// Default Finder flags
45			const uint16 DEFAULT_FINDER_FLAGS = kHasBeenInited;
46
47			// Temporary buffer for transfers from/to kernel space
48			const int TMP_BUF_SIZE = 0x10000;
49			static uint8 *tmp_buf = NULL;
50
51
52			/*
53			* Initialization
54			*/
55
56			void extfs_init(void)
57			{
58			// Allocate temporary buffer
59			tmp_buf = new uint8[TMP_BUF_SIZE];
60			}
61
62
63			/*
64			* Deinitialization
65			*/
66
67			void extfs_exit(void)
68			{
69			// Delete temporary buffer
70			delete[] tmp_buf;
71			}
72
73
74			/*
75			* Get/set finder type/creator for file specified by full path
76			*/
77
78			struct mime2type {
79			const char *mime;
80			uint32 type;
81			uint32 creator;
82			bool reversible; // type -> mime translation possible
83			};
84
85			static const mime2type m2t_translation[] = {
86			{"application/x-compress", 'ZIVM', 'LZIV', true},
87			{"application/x-gzip", 'Gzip', 'Gzip', true},
88			{"application/x-macbinary", 'BINA', '????', false},
89			{"application/mac-binhex40", 'TEXT', 'SITx', false},
90			{"application/pdf", 'PDF ', 'CARO', true},
91			{"application/postscript", 'TEXT', 'ttxt', false},
92			{"application/x-stuffit", 'SIT!', 'SITx', true},
93			{"application/x-tar", 'TARF', 'TAR ', true},
94			{"application/x-uuencode", 'TEXT', 'SITx', false},
95			{"application/zip", 'ZIP ', 'ZIP ', true},
96			{"audio/x-8svx", '8SVX', 'SNDM', true},
97			{"audio/x-aifc", 'AIFC', 'TVOD', true},
98			{"audio/x-aiff", 'AIFF', 'TVOD', true},
99			{"audio/basic", 'ULAW', 'TVOD', true},
100			{"audio/x-midi", 'MIDI', 'TVOD', true},
101			{"audio/x-mpeg", 'MPG ', 'TVOD', true},
102			{"audio/x-wav", 'WAVE', 'TVOD', true},
103			{"image/x-bmp", 'BMPf', 'ogle', true},
104			{"image/gif", 'GIFf', 'ogle', true},
105			{"image/x-ilbm", 'ILBM', 'GKON', true},
106			{"image/jpeg", 'JPEG', 'ogle', true},
107			{"image/jpeg", 'JFIF', 'ogle', true},
108			{"image/x-photoshop", '8BPS', '8BIM', true},
109			{"image/pict", 'PICT', 'ogle', true},
110			{"image/png", 'PNGf', 'ogle', true},
111			{"image/x-sgi", '.SGI', 'ogle', true},
112			{"image/x-targa", 'TPIC', 'ogle', true},
113			{"image/tiff", 'TIFF', 'ogle', true},
114			{"text/html", 'TEXT', 'MOSS', false},
115			{"text/plain", 'TEXT', 'ttxt', true},
116			{"text/rtf", 'TEXT', 'MSWD', false},
117			{"text/x-source-code", 'TEXT', 'R*ch', false},
118			{"video/mpeg", 'MPEG', 'TVOD', true},
119			{"video/quicktime", 'MooV', 'TVOD', true},
120			{"video/x-flc", 'FLI ', 'TVOD', true},
121			{"video/x-msvideo", 'VfW ', 'TVOD', true},
122			{NULL, 0, 0, false} // End marker
123			};
124
125			void get_finder_type(const char *path, uint32 &type, uint32 &creator)
126			{
127			type = 0;
128			creator = 0;
129
130			// Open file
131			int fd = open(path, O_RDONLY);
132			if (fd < 0)
133			return;
134
135			// Read BeOS MIME type and close file
136			char mime[256];
137			ssize_t actual = fs_read_attr(fd, "BEOS:TYPE", B_MIME_STRING_TYPE, 0, mime, 256);
138			mime[255] = 0;
139
140			if (actual > 0) {
141
142			// Translate MIME type to MacOS type/creator
143			char mactype[4];
144			if (sscanf(mime, "application/x-MacOS-%c%c%c%c", mactype, mactype+1, mactype+2, mactype+3) == 4) {
145
146			// MacOS style type
147			memcpy(&type, mactype, 4);
148
149			} else {
150
151			// MIME string, look in table
152			for (int i=0; m2t_translation[i].mime; i++) {
153			if (!strcmp(mime, m2t_translation[i].mime)) {
154			type = m2t_translation[i].type;
155			creator = m2t_translation[i].creator;
156			break;
157			}
158			}
159			}
160			}
161
162			// Override file type with MACOS:CREATOR attribute
163			fs_read_attr(fd, "MACOS:CREATOR", B_UINT32_TYPE, 0, &creator, 4);
164
165			// Close file
166			close(fd);
167			}
168
169			void set_finder_type(const char *path, uint32 type, uint32 creator)
170			{
171			// Open file
172			int fd = open(path, O_WRONLY);
173			if (fd < 0)
174			return;
175
176			// Set BEOS:TYPE attribute
177			if (type) {
178			bool written = false;
179			for (int i=0; m2t_translation[i].mime; i++) {
180			if (m2t_translation[i].type == type && m2t_translation[i].reversible) {
181			fs_write_attr(fd, "BEOS:TYPE", B_MIME_STRING_TYPE, 0, m2t_translation[i].mime, strlen(m2t_translation[i].mime) + 1);
182			written = true;
183			break;
184			}
185			}
186			if (!written) {
187			char mime[256];
188			sprintf(mime, "application/x-MacOS-%c%c%c%c", type >> 24, type >> 16, type >> 8, type);
189			fs_write_attr(fd, "BEOS:TYPE", B_MIME_STRING_TYPE, 0, mime, strlen(mime) + 1);
190			}
191			}
192
193			// Set MACOS:CREATOR attribute
194			if (creator)
195			fs_write_attr(fd, "MACOS:CREATOR", B_UINT32_TYPE, 0, &creator, 4);
196
197			// Close file
198			close(fd);
199			}
200
201
202			/*
203			* Get/set finder flags for file/dir specified by full path (MACOS:HFS_FLAGS attribute)
204			*/
205
206			void get_finder_flags(const char *path, uint16 &flags)
207			{
208			flags = DEFAULT_FINDER_FLAGS; // Default
209
210			// Open file
211			int fd = open(path, O_RDONLY);
212			if (fd < 0)
213			return;
214
215			// Read MACOS:HFS_FLAGS attribute
216			fs_read_attr(fd, "MACOS:HFS_FLAGS", B_UINT16_TYPE, 0, &flags, 2);
217
218			// Close file
219			close(fd);
220			}
221
222			void set_finder_flags(const char *path, uint16 flags)
223			{
224			// Open file
225			int fd = open(path, O_WRONLY);
226			if (fd < 0)
227			return;
228
229			// Write MACOS:HFS_FLAGS attribute
230			if (flags != DEFAULT_FINDER_FLAGS)
231			fs_write_attr(fd, "MACOS:HFS_FLAGS", B_UINT16_TYPE, 0, &flags, 2);
232			else
233			fs_remove_attr(fd, "MACOS:HFS_FLAGS");
234
235			// Close file
236			close(fd);
237			}
238
239
240			/*
241			* Resource fork emulation functions
242			*/
243
244			uint32 get_rfork_size(const char *path)
245			{
246			// Open file
247			int fd = open(path, O_RDONLY);
248			if (fd < 0)
249			return 0;
250
251			// Get size of MACOS:RFORK attribute
252			struct attr_info info;
253			if (fs_stat_attr(fd, "MACOS:RFORK", &info) < 0)
254			info.size = 0;
255
256			// Close file and return size
257			close(fd);
258			return info.size;
259			}
260
261			int open_rfork(const char *path, int flag)
262			{
263			// Open original file
264			int fd = open(path, flag);
265			if (fd < 0)
266			return -1;
267
268			// Open temporary file for resource fork
269			char rname[L_tmpnam];
270			tmpnam(rname);
271			int rfd = open(rname, O_RDWR \| O_CREAT \| O_TRUNC, 0664);
272			if (rfd < 0) {
273			close(fd);
274			return -1;
275			}
276			unlink(rname); // File will be deleted when closed
277
278			// Get size of MACOS:RFORK attribute
279			struct attr_info info;
280			if (fs_stat_attr(fd, "MACOS:RFORK", &info) < 0)
281			info.size = 0;
282
283			// Copy resource data from attribute to temporary file
284			if (info.size > 0) {
285
286			// Allocate buffer
287			void *buf = malloc(info.size);
288			if (buf == NULL) {
289			close(rfd);
290			close(fd);
291			return -1;
292			}
293
294			// Copy data
295			fs_read_attr(fd, "MACOS:RFORK", B_RAW_TYPE, 0, buf, info.size);
296			write(rfd, buf, info.size);
297			lseek(rfd, 0, SEEK_SET);
298
299			// Free buffer
300			if (buf)
301			free(buf);
302			}
303
304			// Close original file
305			close(fd);
306			return rfd;
307			}
308
309			void close_rfork(const char *path, int fd)
310			{
311			if (fd < 0)
312			return;
313
314			// Get size of temporary file
315			struct stat st;
316			if (fstat(fd, &st) < 0)
317			st.st_size = 0;
318
319			// Open original file
320			int ofd = open(path, O_WRONLY);
321			if (ofd > 0) {
322
323			// Copy resource data to MACOS:RFORK attribute
324			if (st.st_size > 0) {
325
326			// Allocate buffer
327			void *buf = malloc(st.st_size);
328			if (buf == NULL) {
329			close(ofd);
330			close(fd);
331			return;
332			}
333
334			// Copy data
335			lseek(fd, 0, SEEK_SET);
336			read(fd, buf, st.st_size);
337			fs_write_attr(ofd, "MACOS:RFORK", B_RAW_TYPE, 0, buf, st.st_size);
338
339			// Free buffer
340			if (buf)
341			free(buf);
342
343			} else
344			fs_remove_attr(ofd, "MACOS:RFORK");
345
346			// Close original file
347			close(ofd);
348			}
349
350			// Close temporary file
351			close(fd);
352			}
353
354
355			/*
356			* Read "length" bytes from file to "buffer",
357			* returns number of bytes read (or 0)
358			*/
359
360			static inline ssize_t sread(int fd, void *buf, size_t count)
361			{
362			ssize_t res;
363			while ((res = read(fd, buf, count)) == B_INTERRUPTED) ;
364			return res;
365			}
366
367			size_t extfs_read(int fd, void *buffer, size_t length)
368			{
369			errno = 0;
370
371			// Buffer in kernel space?
372			size_t actual = 0;
373			if ((uint32)buffer < 0x80000000) {
374
375			// Yes, transfer via buffer
376			while (length) {
377			size_t transfer_size = (length > TMP_BUF_SIZE) ? TMP_BUF_SIZE : length;
378			ssize_t res = sread(fd, tmp_buf, transfer_size);
379			if (res >= 0) {
380			memcpy(buffer, tmp_buf, res);
381			buffer = (void )((uint8 )buffer + res);
382			length -= res;
383			actual += res;
384			}
385			if (res != transfer_size)
386			return actual;
387			}
388
389			} else {
390
391			// No, transfer directly
392			actual = sread(fd, buffer, length);
393			if (actual < 0)
394			actual = 0;
395			}
396			return actual;
397			}
398
399
400			/*
401			* Write "length" bytes from "buffer" to file,
402			* returns number of bytes written (or 0)
403			*/
404
405			static inline ssize_t swrite(int fd, void *buf, size_t count)
406			{
407			ssize_t res;
408			while ((res = write(fd, buf, count)) == B_INTERRUPTED) ;
409			return res;
410			}
411
412			size_t extfs_write(int fd, void *buffer, size_t length)
413			{
414			errno = 0;
415
416			// Buffer in kernel space?
417			size_t actual = 0;
418			if ((uint32)buffer < 0x80000000) {
419
420			// Yes, transfer via buffer
421			while (length) {
422			size_t transfer_size = (length > TMP_BUF_SIZE) ? TMP_BUF_SIZE : length;
423			memcpy(tmp_buf, buffer, transfer_size);
424			ssize_t res = swrite(fd, tmp_buf, transfer_size);
425			if (res >= 0) {
426			buffer = (void )((uint8 )buffer + res);
427			length -= res;
428			actual += res;
429			}
430			if (res != transfer_size)
431			return actual;
432			}
433
434			} else {
435
436			// No, transfer directly
437			actual = swrite(fd, buffer, length);
438			if (actual < 0)
439			actual = 0;
440			}
441			return actual;
442			}