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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "hdif.h"
#include <stack.h>
const void *HDIF_get_idata(const struct HDIF_common_hdr *hdif, unsigned int di,
unsigned int *size)
{
const struct HDIF_common_hdr *hdr = hdif;
const struct HDIF_idata_ptr *iptr;
if (be16_to_cpu(hdr->d1f0) != 0xd1f0) {
prerror("HDIF: Bad header format !\n");
backtrace();
return NULL;
}
if (di >= be16_to_cpu(hdr->idptr_count)) {
prlog(PR_DEBUG, "HDIF: idata %d out of range for %.6s!\n",
di, hdr->id);
return NULL;
}
iptr = (void *)hdif + be32_to_cpu(hdr->idptr_off)
+ di * sizeof(struct HDIF_idata_ptr);
if (size)
*size = be32_to_cpu(iptr->size);
return (void *)hdif + be32_to_cpu(iptr->offset);
}
const void *HDIF_get_iarray_item(const struct HDIF_common_hdr *hdif,
unsigned int di, unsigned int ai,
unsigned int *size)
{
const struct HDIF_array_hdr *ahdr;
unsigned int asize;
const void *arr;
arr = HDIF_get_idata(hdif, di, &asize);
if (!arr)
return NULL;
if (asize < sizeof(struct HDIF_array_hdr)) {
prerror("HDIF: idata block too small for array !\n");
backtrace();
return NULL;
}
ahdr = arr;
if (ai >= be32_to_cpu(ahdr->ecnt)) {
prerror("HDIF: idata array index out of range !\n");
backtrace();
return NULL;
}
if (size)
*size = be32_to_cpu(ahdr->eactsz);
return arr + be32_to_cpu(ahdr->offset) + ai * be32_to_cpu(ahdr->esize);
}
int HDIF_get_iarray_size(const struct HDIF_common_hdr *hdif, unsigned int di)
{
const struct HDIF_array_hdr *ahdr;
unsigned int asize;
const void *arr;
arr = HDIF_get_idata(hdif, di, &asize);
if (!arr)
return -1;
if (asize < sizeof(struct HDIF_array_hdr)) {
prerror("HDIF: idata block too small for array !\n");
backtrace();
return -1;
}
ahdr = arr;
return be32_to_cpu(ahdr->ecnt);
}
struct HDIF_child_ptr *
HDIF_child_arr(const struct HDIF_common_hdr *hdif, unsigned int idx)
{
struct HDIF_child_ptr *children;
children = (void *)hdif + be32_to_cpu(hdif->child_off);
if (idx >= be16_to_cpu(hdif->child_count)) {
prerror("HDIF: child array idx out of range!\n");
backtrace();
return NULL;
}
return &children[idx];
}
struct HDIF_common_hdr *HDIF_child(const struct HDIF_common_hdr *hdif,
const struct HDIF_child_ptr *child,
unsigned int idx,
const char *eyecatcher)
{
void *base = (void *)hdif;
struct HDIF_common_hdr *ret;
long child_off;
/* child must be in hdif's child array */
child_off = (void *)child - (base + be32_to_cpu(hdif->child_off));
assert(child_off % sizeof(struct HDIF_child_ptr) == 0);
assert(child_off / sizeof(struct HDIF_child_ptr)
< be16_to_cpu(hdif->child_count));
assert(idx < be32_to_cpu(child->count));
if (be32_to_cpu(child->size) < sizeof(struct HDIF_common_hdr)) {
prerror("HDIF: %s child #%i too small: %u\n",
eyecatcher, idx, be32_to_cpu(child->size));
backtrace();
return NULL;
}
ret = base + be32_to_cpu(child->offset)
+ be32_to_cpu(child->size) * idx;
if (!HDIF_check(ret, eyecatcher)) {
prerror("HDIF: #%i bad type (wanted %6s, got %6s)\n",
idx, eyecatcher, ret->id);
backtrace();
return NULL;
}
return ret;
}
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