| /trunk/uspace/lib/libblock/libblock.c |
|---|
| 0,0 → 1,147 |
| /* |
| * Copyright (c) 2008 Jakub Jermar |
| * Copyright (c) 2008 Martin Decky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| /** @addtogroup libblock |
| * @{ |
| */ |
| /** |
| * @file |
| * @brief |
| */ |
| #include "libblock.h" |
| #include "../../srv/vfs/vfs.h" |
| #include "../../srv/rd/rd.h" |
| #include <errno.h> |
| #include <async.h> |
| #include <ipc/ipc.h> |
| #include <as.h> |
| #include <assert.h> |
| /** Read data from a block device. |
| * |
| * @param phone Phone to be used to communicate with the device. |
| * @param buffer Communication buffer shared with the device. |
| * @param bufpos Pointer to the first unread valid offset within the |
| * communication buffer. |
| * @param buflen Pointer to the number of unread bytes that are ready in |
| * the communication buffer. |
| * @param pos Device position to be read. |
| * @param dst Destination buffer. |
| * @param size Size of the destination buffer. |
| * @param block_size Block size to be used for the transfer. |
| * |
| * @return True on success, false on failure. |
| */ |
| bool blockread(int phone, void *buffer, off_t *bufpos, size_t *buflen, |
| off_t *pos, void *dst, size_t size, size_t block_size) |
| { |
| off_t offset = 0; |
| size_t left = size; |
| while (left > 0) { |
| size_t rd; |
| if (*bufpos + left < *buflen) |
| rd = left; |
| else |
| rd = *buflen - *bufpos; |
| if (rd > 0) { |
| /* |
| * Copy the contents of the communication buffer to the |
| * destination buffer. |
| */ |
| memcpy(dst + offset, buffer + *bufpos, rd); |
| offset += rd; |
| *bufpos += rd; |
| *pos += rd; |
| left -= rd; |
| } |
| if (*bufpos == *buflen) { |
| /* Refill the communication buffer with a new block. */ |
| ipcarg_t retval; |
| int rc = async_req_2_1(phone, RD_READ_BLOCK, |
| *pos / block_size, block_size, &retval); |
| if ((rc != EOK) || (retval != EOK)) |
| return false; |
| *bufpos = 0; |
| *buflen = block_size; |
| } |
| } |
| return true; |
| } |
| int dev_phone = -1; /* FIXME */ |
| void *dev_buffer = NULL; /* FIXME */ |
| block_t *block_get(dev_handle_t dev_handle, off_t offset, size_t bs) |
| { |
| /* FIXME */ |
| block_t *b; |
| off_t bufpos = 0; |
| size_t buflen = 0; |
| off_t pos = offset * bs; |
| assert(dev_phone != -1); |
| assert(dev_buffer); |
| b = malloc(sizeof(block_t)); |
| if (!b) |
| return NULL; |
| b->data = malloc(bs); |
| if (!b->data) { |
| free(b); |
| return NULL; |
| } |
| b->size = bs; |
| if (!blockread(dev_phone, dev_buffer, &bufpos, &buflen, &pos, b->data, |
| bs, bs)) { |
| free(b->data); |
| free(b); |
| return NULL; |
| } |
| return b; |
| } |
| void block_put(block_t *block) |
| { |
| /* FIXME */ |
| free(block->data); |
| free(block); |
| } |
| /** @} |
| */ |
| /trunk/uspace/lib/libblock/libblock.h |
|---|
| 0,0 → 1,62 |
| /* |
| * Copyright (c) 2008 Jakub Jermar |
| * Copyright (c) 2008 Martin Decky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| /** @addtogroup libblock |
| * @{ |
| */ |
| /** |
| * @file |
| */ |
| #ifndef LIBBLOCK_LIBBLOCK_H_ |
| #define LIBBLOCK_LIBBLOCK_H_ |
| #include <stdint.h> |
| #include "../../srv/vfs/vfs.h" |
| typedef struct block { |
| void *data; |
| size_t size; |
| bool dirty; |
| } block_t; |
| extern int dev_phone; /* FIXME */ |
| extern void *dev_buffer; /* FIXME */ |
| extern block_t *block_get(dev_handle_t, off_t, size_t); |
| extern void block_put(block_t *); |
| extern bool blockread(int, void *, off_t *, size_t *, off_t *, void *, size_t, |
| size_t); |
| #endif |
| /** @} |
| */ |
| /trunk/uspace/lib/libblock/Makefile |
|---|
| 0,0 → 1,66 |
| # |
| # Copyright (c) 2005 Martin Decky |
| # Copyright (c) 2007 Jakub Jermar |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions |
| # are met: |
| # |
| # - Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # - Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # - The name of the author may not be used to endorse or promote products |
| # derived from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| # |
| ## Common compiler flags |
| # |
| LIBC_PREFIX = ../libc |
| ## Setup toolchain |
| # |
| include $(LIBC_PREFIX)/Makefile.toolchain |
| CFLAGS += -Iinclude |
| ## Sources |
| # |
| SOURCES = \ |
| libblock.c |
| OBJECTS := $(addsuffix .o,$(basename $(SOURCES))) |
| .PHONY: all clean depend |
| all: libblock.a |
| -include Makefile.depend |
| clean: |
| -rm -f libblock.a Makefile.depend |
| find . -name '*.o' -follow -exec rm \{\} \; |
| depend: |
| -makedepend -f - -- $(DEFS) $(CFLAGS) -- $(SOURCES) > Makefile.depend 2> /dev/null |
| libblock.a: depend $(OBJECTS) |
| $(AR) rc libblock.a $(OBJECTS) |
| %.o: %.c |
| $(CC) $(DEFS) $(CFLAGS) -c $< -o $@ |