126 lines
2.4 KiB
C
126 lines
2.4 KiB
C
/* blob.c - Alpine Package Keeper (APK)
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*
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* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
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* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation. See http://www.gnu.org/ for details.
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*/
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#include <malloc.h>
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#include <string.h>
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#include "apk_blob.h"
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char *apk_blob_cstr(apk_blob_t blob)
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{
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char *cstr;
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if (blob.ptr[blob.len-1] == 0)
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return strdup(blob.ptr);
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cstr = malloc(blob.len + 1);
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memcpy(cstr, blob.ptr, blob.len);
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cstr[blob.len] = 0;
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return cstr;
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}
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int apk_blob_rsplit(apk_blob_t blob, char split, apk_blob_t *l, apk_blob_t *r)
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{
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char *sep;
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sep = memrchr(blob.ptr, split, blob.len);
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if (sep == NULL)
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return 0;
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if (l != NULL)
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*l = APK_BLOB_PTR_PTR(blob.ptr, sep - 1);
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if (r != NULL)
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*r = APK_BLOB_PTR_PTR(sep + 1, blob.ptr + blob.len);
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return 1;
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}
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int apk_blob_splitstr(apk_blob_t blob, char *split, apk_blob_t *l, apk_blob_t *r)
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{
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int splitlen = strlen(split);
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char *pos = blob.ptr, *end = blob.ptr + blob.len - splitlen + 1;
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if (end < pos)
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return 0;
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while (1) {
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pos = memchr(pos, split[0], end - pos);
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if (pos == NULL)
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return 0;
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if (memcmp(pos, split, splitlen) != 0) {
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pos++;
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continue;
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}
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*l = APK_BLOB_PTR_PTR(blob.ptr, pos-1);
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*r = APK_BLOB_PTR_PTR(pos+splitlen, blob.ptr+blob.len-1);
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return 1;
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}
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}
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static int dx(int c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 0xa;
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 0xa;
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return -1;
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}
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unsigned apk_blob_uint(apk_blob_t blob, int base)
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{
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unsigned val;
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int i, ch;
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val = 0;
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for (i = 0; i < blob.len; i++) {
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if (blob.ptr[i] == 0)
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break;
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ch = dx(blob.ptr[i]);
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if (ch < 0 || ch >= base)
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return 0;
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val *= base;
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val += ch;
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}
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return val;
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}
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int apk_hexdump_parse(apk_blob_t to, apk_blob_t from)
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{
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int i;
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if (to.len * 2 != from.len)
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return -1;
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for (i = 0; i < from.len / 2; i++)
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to.ptr[i] = (dx(from.ptr[i*2]) << 4) + dx(from.ptr[i*2+1]);
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return 0;
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}
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int apk_hexdump_format(int tolen, char *to, apk_blob_t from)
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{
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static const char *xd = "0123456789abcdef";
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int i;
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for (i = 0; i < from.len && i*2+2 < tolen; i++) {
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to[i*2+0] = xd[(from.ptr[i] >> 4) & 0xf];
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to[i*2+1] = xd[from.ptr[i] & 0xf];
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}
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to[i*2] = 0;
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return i*2;
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}
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