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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2011 secunet Security Networks AG
* Copyright (C) 2013 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/* The CBFS core requires a couple of #defines or functions to adapt it to the
* target environment:
*
* CBFS_CORE_WITH_LZMA (must be #define)
* if defined, ulzma() must exist for decompression of data streams
*
* CBFS_HEADER_ROM_ADDRESS
* ROM address (offset) of CBFS header. Underlying CBFS media may interpret
* it in other way so we call this "address".
*
* ERROR(x...)
* print an error message x (in printf format)
*
* LOG(x...)
* print a message x (in printf format)
*
* DEBUG(x...)
* print a debug message x (in printf format)
*
*/
#include <cbfs.h>
#include <string.h>
/* returns a pointer to CBFS master header, or CBFS_HEADER_INVALID_ADDRESS
* on failure */
const struct cbfs_header *cbfs_get_header(struct cbfs_media *media)
{
const struct cbfs_header *header;
struct cbfs_media default_media;
if (media == CBFS_DEFAULT_MEDIA) {
media = &default_media;
if (init_default_cbfs_media(media) != 0) {
ERROR("Failed to initialize default media.\n");
return CBFS_HEADER_INVALID_ADDRESS;
}
}
media->open(media);
DEBUG("CBFS_HEADER_ROM_ADDRESS: 0x%x/0x%x\n", CBFS_HEADER_ROM_ADDRESS,
CONFIG_ROM_SIZE);
header = media->map(media, CBFS_HEADER_ROM_ADDRESS, sizeof(*header));
media->close(media);
if (header == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
ERROR("Failed to load CBFS header from 0x%x\n",
CBFS_HEADER_ROM_ADDRESS);
return CBFS_HEADER_INVALID_ADDRESS;
}
if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
ERROR("Could not find valid CBFS master header at %x: "
"%x vs %x.\n", CBFS_HEADER_ROM_ADDRESS, CBFS_HEADER_MAGIC,
ntohl(header->magic));
if (header->magic == 0xffffffff) {
ERROR("Maybe ROM is not mapped properly?\n");
}
return CBFS_HEADER_INVALID_ADDRESS;
}
return header;
}
/* public API starts here*/
struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
{
const char *file_name;
uint32_t offset, align, romsize, name_len;
const struct cbfs_header *header;
struct cbfs_file file, *file_ptr;
struct cbfs_media default_media;
if (media == CBFS_DEFAULT_MEDIA) {
media = &default_media;
if (init_default_cbfs_media(media) != 0) {
ERROR("Failed to initialize default media.\n");
return NULL;
}
}
if (CBFS_HEADER_INVALID_ADDRESS == (header = cbfs_get_header(media)))
return NULL;
// Logical offset (for source media) of first file.
offset = ntohl(header->offset);
align = ntohl(header->align);
romsize = ntohl(header->romsize);
// TODO Add a "size" in CBFS header for a platform independent way to
// determine the end of CBFS data.
#if defined(CONFIG_ARCH_X86) && CONFIG_ARCH_X86
romsize -= htonl(header->bootblocksize);
#endif
DEBUG("CBFS location: 0x%x~0x%x, align: %d\n", offset, romsize, align);
DEBUG("Looking for '%s' starting from 0x%x.\n", name, offset);
media->open(media);
while (offset < romsize &&
media->read(media, &file, offset, sizeof(file)) == sizeof(file)) {
if (memcmp(CBFS_FILE_MAGIC, file.magic,
sizeof(file.magic)) != 0) {
uint32_t new_align = align;
if (offset % align)
new_align += align - (offset % align);
ERROR("ERROR: No file header found at 0x%xx - "
"try next aligned address: 0x%x.\n", offset,
offset + new_align);
offset += new_align;
continue;
}
name_len = ntohl(file.offset) - sizeof(file);
DEBUG(" - load entry 0x%x file name (%d bytes)...\n", offset,
name_len);
// load file name (arbitrary length).
file_name = (const char*)media->map(
media, offset + sizeof(file), name_len);
if (file_name == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
ERROR("ERROR: Failed to get filename: 0x%x.\n", offset);
} else if (strcmp(file_name, name) == 0) {
int file_offset = ntohl(file.offset),
file_len = ntohl(file.len);
DEBUG("Found file (offset=0x%x, len=%d).\n",
offset + file_offset, file_len);
media->unmap(media, file_name);
file_ptr = media->map(media, offset,
file_offset + file_len);
media->close(media);
return file_ptr;
} else {
DEBUG(" (unmatched file @0x%x: %s)\n", offset,
file_name);
media->unmap(media, file_name);
}
// Move to next file.
offset += ntohl(file.len) + ntohl(file.offset);
if (offset % align)
offset += align - (offset % align);
}
media->close(media);
LOG("WARNING: '%s' not found.\n", name);
return NULL;
}
void *cbfs_get_file_content(struct cbfs_media *media, const char *name,
int type, size_t *sz)
{
struct cbfs_file *file = cbfs_get_file(media, name);
if (sz)
*sz = 0;
if (file == NULL) {
ERROR("Could not find file '%s'.\n", name);
return NULL;
}
if (ntohl(file->type) != type) {
ERROR("File '%s' is of type %x, but we requested %x.\n", name,
ntohl(file->type), type);
return NULL;
}
if (sz)
*sz = ntohl(file->len);
return (void *)CBFS_SUBHEADER(file);
}
int cbfs_decompress(int algo, void *src, void *dst, int len)
{
switch (algo) {
case CBFS_COMPRESS_NONE:
memcpy(dst, src, len);
return len;
#ifdef CBFS_CORE_WITH_LZMA
case CBFS_COMPRESS_LZMA:
return ulzma(src, dst);
#endif
default:
ERROR("tried to decompress %d bytes with algorithm #%x,"
"but that algorithm id is unsupported.\n", len,
algo);
return 0;
}
}
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