/*
* Copyright (c) 2012 Sean Bartell
* 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 bithenge
* @{
*/
/**
* @file
* Provide various external sources of data.
*/
#include <errno.h>
#include <stdlib.h>
#include <bithenge/blob.h>
#include <bithenge/file.h>
#include <bithenge/source.h>
#include "common.h"
#ifdef __HELENOS__
#include <loc.h>
#include "helenos/block.h"
#endif
static inline int hex_digit(char digit)
{
if ('0' <= digit && digit <= '9')
return digit - '0' + 0x0;
if ('a' <= digit && digit <= 'f')
return digit - 'a' + 0xa;
if ('A' <= digit && digit <= 'F')
return digit - 'A' + 0xA;
return -1;
}
static errno_t blob_from_hex(bithenge_node_t **out, const char *hex)
{
size_t size = str_length(hex);
if (size % 2)
return EINVAL;
size /= 2;
char *buffer = malloc(size);
if (!buffer)
return ENOMEM;
for (size_t i = 0; i < size; i++) {
int upper = hex_digit(hex[2 * i + 0]);
int lower = hex_digit(hex[2 * i + 1]);
if (upper == -1 || lower == -1) {
free(buffer);
return EINVAL;
}
buffer[i] = upper << 4 | lower;
}
return bithenge_new_blob_from_buffer(out, buffer, size, true);
}
/** Create a node from a source described with a string. For instance,
* "hex:55aa" will result in a blob node. If there is no colon in the string,
* it is assumed to be a filename.
* @param[out] out Stores the created node.
* @param source Specifies the node to be created.
* @return EOK on success or an error code from errno.h.
*/
errno_t bithenge_node_from_source(bithenge_node_t **out, const char *source)
{
if (str_chr(source, ':')) {
if (!str_lcmp(source, "file:", 5)) {
// Example: file:/textdemo
return bithenge_new_file_blob(out, source + 5);
#ifdef __HELENOS__
} else if (!str_lcmp(source, "block:", 6)) {
// Example: block:bd/initrd
service_id_t service_id;
errno_t rc = loc_service_get_id(source + 6, &service_id, 0);
if (rc != EOK)
return rc;
return bithenge_new_block_blob(out, service_id);
#endif
} else if (!str_lcmp(source, "hex:", 4)) {
// Example: hex:04000000
return blob_from_hex(out, source + 4);
} else {
return EINVAL;
}
}
return bithenge_new_file_blob(out, source);
}
/** @}
*/