| 1 | /*
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| 2 | * Copyright (c) 2012 Sean Bartell
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup bithenge
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file
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| 34 | * Provide various external sources of data.
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| 35 | */
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| 36 |
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| 37 | #include <errno.h>
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| 38 | #include <stdlib.h>
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| 39 | #include <bithenge/blob.h>
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| 40 | #include <bithenge/file.h>
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| 41 | #include <bithenge/source.h>
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| 42 | #include "common.h"
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| 43 |
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| 44 | #ifdef __HELENOS__
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| 45 | #include <loc.h>
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| 46 | #include "helenos/block.h"
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| 47 | #endif
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| 48 |
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| 49 | static inline int hex_digit(char digit)
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| 50 | {
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| 51 | if ('0' <= digit && digit <= '9')
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| 52 | return digit - '0' + 0x0;
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| 53 | if ('a' <= digit && digit <= 'f')
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| 54 | return digit - 'a' + 0xa;
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| 55 | if ('A' <= digit && digit <= 'F')
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| 56 | return digit - 'A' + 0xA;
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| 57 | return -1;
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| 58 | }
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| 59 |
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| 60 | static errno_t blob_from_hex(bithenge_node_t **out, const char *hex)
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| 61 | {
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| 62 | size_t size = str_length(hex);
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| 63 | if (size % 2)
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| 64 | return EINVAL;
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| 65 | size /= 2;
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| 66 | char *buffer = malloc(size);
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| 67 | if (!buffer)
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| 68 | return ENOMEM;
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| 69 | for (size_t i = 0; i < size; i++) {
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| 70 | int upper = hex_digit(hex[2 * i + 0]);
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| 71 | int lower = hex_digit(hex[2 * i + 1]);
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| 72 | if (upper == -1 || lower == -1) {
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| 73 | free(buffer);
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| 74 | return EINVAL;
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| 75 | }
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| 76 | buffer[i] = upper << 4 | lower;
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| 77 | }
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| 78 | return bithenge_new_blob_from_buffer(out, buffer, size, true);
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| 79 | }
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| 80 |
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| 81 | /** Create a node from a source described with a string. For instance,
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| 82 | * "hex:55aa" will result in a blob node. If there is no colon in the string,
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| 83 | * it is assumed to be a filename.
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| 84 | * @param[out] out Stores the created node.
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| 85 | * @param source Specifies the node to be created.
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| 86 | * @return EOK on success or an error code from errno.h.
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| 87 | */
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| 88 | errno_t bithenge_node_from_source(bithenge_node_t **out, const char *source)
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| 89 | {
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| 90 | if (str_chr(source, ':')) {
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| 91 | if (!str_lcmp(source, "file:", 5)) {
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| 92 | // Example: file:/textdemo
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| 93 | return bithenge_new_file_blob(out, source + 5);
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| 94 | #ifdef __HELENOS__
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| 95 | } else if (!str_lcmp(source, "block:", 6)) {
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| 96 | // Example: block:bd/initrd
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| 97 | service_id_t service_id;
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| 98 | errno_t rc = loc_service_get_id(source + 6, &service_id, 0);
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| 99 | if (rc != EOK)
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| 100 | return rc;
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| 101 | return bithenge_new_block_blob(out, service_id);
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| 102 | #endif
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| 103 | } else if (!str_lcmp(source, "hex:", 4)) {
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| 104 | // Example: hex:04000000
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| 105 | return blob_from_hex(out, source + 4);
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| 106 | } else {
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| 107 | return EINVAL;
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| 108 | }
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| 109 | }
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| 110 | return bithenge_new_file_blob(out, source);
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| 111 | }
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| 112 |
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| 113 | /** @}
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| 114 | */
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