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/* blob.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <malloc.h>
#include <string.h>
#include "apk_blob.h"
char *apk_blob_cstr(apk_blob_t blob)
{
char *cstr;
if (blob.ptr == NULL)
return strdup("");
if (blob.ptr[blob.len-1] == 0)
return strdup(blob.ptr);
cstr = malloc(blob.len + 1);
memcpy(cstr, blob.ptr, blob.len);
cstr[blob.len] = 0;
return cstr;
}
int apk_blob_spn(apk_blob_t blob, const char *accept, apk_blob_t *l, apk_blob_t *r)
{
int i;
for (i = 0; i < blob.len; i++) {
if (strchr(accept, blob.ptr[i]) == NULL) {
*l = APK_BLOB_PTR_LEN(blob.ptr, i);
*r = APK_BLOB_PTR_LEN(blob.ptr+i, blob.len-i);
return 1;
}
}
return 0;
}
int apk_blob_cspn(apk_blob_t blob, const char *reject, apk_blob_t *l, apk_blob_t *r)
{
int i;
for (i = 0; i < blob.len; i++) {
if (strchr(reject, blob.ptr[i]) != NULL) {
*l = APK_BLOB_PTR_LEN(blob.ptr, i);
*r = APK_BLOB_PTR_LEN(blob.ptr+i, blob.len-i);
return 1;
}
}
return 0;
}
int apk_blob_rsplit(apk_blob_t blob, char split, apk_blob_t *l, apk_blob_t *r)
{
char *sep;
sep = memrchr(blob.ptr, split, blob.len);
if (sep == NULL)
return 0;
if (l != NULL)
*l = APK_BLOB_PTR_PTR(blob.ptr, sep - 1);
if (r != NULL)
*r = APK_BLOB_PTR_PTR(sep + 1, blob.ptr + blob.len - 1);
return 1;
}
int apk_blob_split(apk_blob_t blob, apk_blob_t split, apk_blob_t *l, apk_blob_t *r)
{
char *pos = blob.ptr, *end = blob.ptr + blob.len - split.len + 1;
if (end < pos)
return 0;
while (1) {
pos = memchr(pos, split.ptr[0], end - pos);
if (pos == NULL)
return 0;
if (split.len > 1 && memcmp(pos, split.ptr, split.len) != 0) {
pos++;
continue;
}
*l = APK_BLOB_PTR_PTR(blob.ptr, pos-1);
*r = APK_BLOB_PTR_PTR(pos+split.len, blob.ptr+blob.len-1);
return 1;
}
}
unsigned long apk_blob_hash_seed(apk_blob_t blob, unsigned long seed)
{
unsigned long hash = seed;
int i;
for (i = 0; i < blob.len; i++)
hash = hash * 33 + blob.ptr[i];
return hash;
}
unsigned long apk_blob_hash(apk_blob_t blob)
{
return apk_blob_hash_seed(blob, 5381);
}
int apk_blob_compare(apk_blob_t a, apk_blob_t b)
{
if (a.len == b.len)
return memcmp(a.ptr, b.ptr, a.len);
if (a.len < b.len)
return -1;
return 1;
}
int apk_blob_for_each_segment(apk_blob_t blob, const char *split,
int (*cb)(void *ctx, apk_blob_t blob), void *ctx)
{
apk_blob_t l, r, s = APK_BLOB_STR(split);
int rc;
r = blob;
while (apk_blob_split(r, s, &l, &r)) {
rc = cb(ctx, l);
if (rc != 0)
return rc;
}
if (r.len > 0)
return cb(ctx, r);
return 0;
}
static inline int dx(int c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 0xa;
if (c >= 'A' && c <= 'F')
return c - 'A' + 0xa;
return -1;
}
unsigned int apk_blob_parse_uint(apk_blob_t *blob, int base)
{
unsigned int val;
int ch;
val = 0;
while (blob->len && blob->ptr[0] != 0) {
ch = dx(blob->ptr[0]);
if (ch < 0 || ch >= base)
break;
val *= base;
val += ch;
blob->ptr++;
blob->len--;
}
return val;
}
int apk_blob_parse_char(apk_blob_t *blob)
{
int r;
if (blob->len == 0 || blob->ptr == NULL)
return -1;
r = blob->ptr[0];
blob->ptr++;
blob->len--;
return r;
}
int apk_hexdump_parse(apk_blob_t to, apk_blob_t from)
{
int i;
if (to.len * 2 != from.len)
return -1;
for (i = 0; i < from.len / 2; i++)
to.ptr[i] = (dx(from.ptr[i*2]) << 4) + dx(from.ptr[i*2+1]);
return 0;
}
int apk_hexdump_format(int tolen, char *to, apk_blob_t from)
{
static const char *xd = "0123456789abcdef";
int i;
for (i = 0; i < from.len && i*2+2 < tolen; i++) {
to[i*2+0] = xd[(from.ptr[i] >> 4) & 0xf];
to[i*2+1] = xd[from.ptr[i] & 0xf];
}
to[i*2] = 0;
return i*2;
}
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