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hostprogs_lib_xz.c
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hostprogs_lib_xz.c
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/* microfs - Minimally Improved Compressed Read Only File System
* Copyright (C) 2012, 2013, 2014, 2015, 2016, 2017, ..., +%Y
* Erik Edlund <erik.edlund@32767.se>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "hostprogs_lib.h"
#include "microfs_fs.h"
#include "libinfo_xz.h"
#ifdef HOSTPROGS_LIB_XZ
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <lzma.h>
/* Branch/Call/Jump (BCJ) conversion filter.
*/
struct hostprog_lib_xz_bcj {
const char* const bcj_name;
lzma_vli bcj_id;
};
/* BCJ filters available from liblzma.
*/
static struct hostprog_lib_xz_bcj bcjs[] = {
{ "x86", LZMA_FILTER_X86 },
{ "powerpc", LZMA_FILTER_POWERPC },
{ "ia64", LZMA_FILTER_IA64 },
{ "arm", LZMA_FILTER_ARM },
{ "armthumb", LZMA_FILTER_ARMTHUMB },
{ "sparc", LZMA_FILTER_SPARC },
{ NULL, LZMA_VLI_UNKNOWN }
};
#define BCJS_SLOTS \
(sizeof(bcjs) / sizeof(struct hostprog_lib_xz_bcj))
struct hostprog_lib_xz_filter {
uint8_t* f_buf;
size_t f_bufsz;
lzma_filter f_backends[3];
};
struct hostprog_lib_xz_data {
struct hostprog_lib_xz_filter d_filters[BCJS_SLOTS + 1];
lzma_vli d_blksz;
lzma_options_lzma d_opts;
};
static int hostprog_lib_xz_init(void** data, __u32 blksz)
{
struct hostprog_lib_xz_data* xz_data;
(void)blksz;
if (!(*data = xz_data = malloc(sizeof(*xz_data)))) {
errno = ENOMEM;
return -1;
}
memset(xz_data->d_filters, 0, sizeof(xz_data->d_filters));
lzma_lzma_preset(&xz_data->d_opts, LZMA_PRESET_DEFAULT);
xz_data->d_blksz = blksz;
xz_data->d_opts.dict_size = LIBINFO_XZ_DICTSZ;
/* Default filter, the user might add more by specifying them
* using the -l param for `microfsmki`.
*/
xz_data->d_filters[0].f_backends[0].id = LZMA_FILTER_LZMA2;
xz_data->d_filters[0].f_backends[0].options = &xz_data->d_opts;
xz_data->d_filters[0].f_backends[1].id = LZMA_VLI_UNKNOWN;
return 0;
}
static void hostprog_lib_xz_mk_usage(FILE* const dest)
{
fprintf(dest,
" dictionary=<int> dictionary size (power of two, bigger than %u)\n"
" filter=<str> add a BCJ conversion filter"
" (x86, powerpc, ia64, arm, armthumb, sparc)\n"
"", LZMA_DICT_SIZE_MIN
);
}
static int hostprog_lib_xz_mk_option(void* data,
const char* name, const char* value)
{
struct hostprog_lib_xz_data* xz_data = data;
if (strcmp(name, "dictionary") == 0) {
if (!value) {
errno = EINVAL;
goto err;
}
char* endptr;
xz_data->d_opts.dict_size = strtoul(value, &endptr, 10);
if (*endptr != '\0') {
errno = EINVAL;
goto err;
}
return 0;
}
if (strcmp(name, "filter") == 0) {
if (!value) {
errno = EINVAL;
goto err;
}
size_t i;
size_t j;
int bcj_found = 0;
int filter_found = 0;
for (i = 0; i < BCJS_SLOTS; i++) {
if (strcmp(bcjs[i].bcj_name, value) == 0) {
bcj_found = 1;
break;
}
}
for (j = 1; j < BCJS_SLOTS; j++) {
if (xz_data->d_filters[j].f_backends[0].id == 0) {
filter_found = 1;
break;
}
}
if (!bcj_found || !filter_found) {
errno = EINVAL;
goto err;
}
xz_data->d_filters[j].f_backends[0].id = bcjs[i].bcj_id;
xz_data->d_filters[j].f_backends[1].id = LZMA_FILTER_LZMA2;
xz_data->d_filters[j].f_backends[1].options = &xz_data->d_opts;
xz_data->d_filters[j].f_backends[2].id = LZMA_VLI_UNKNOWN;
__u32 upperbound = lzma_stream_buffer_bound(xz_data->d_blksz);
xz_data->d_filters[j].f_bufsz = 0;
xz_data->d_filters[j].f_buf = malloc(upperbound);
if (!xz_data->d_filters[j].f_buf) {
errno = ENOMEM;
goto err;
}
return 0;
}
/* It is possible to get here for unknown option names.
*/
errno = EINVAL;
err:
return -1;
}
static __u64 hostprog_lib_xz_mk_dd(void* data, char* base, __u64 offset)
{
struct microfs_dd_xz* dd_xz = (struct microfs_dd_xz*)(base + offset);
struct hostprog_lib_xz_data* xz_data = data;
dd_xz->dd_magic = __cpu_to_le32(MICROFS_DD_XZ_MAGIC);
dd_xz->dd_dictsz = __cpu_to_le32(xz_data->d_opts.dict_size);
return offset + hostprog_lib_xz.hl_info->li_dd_sz;
}
static int hostprog_lib_xz_ck_dd(void* data, char* dd)
{
int err = -1;
struct microfs_dd_xz* dd_xz = (struct microfs_dd_xz*)dd;
struct hostprog_lib_xz_data* xz_data = data;
if (__le32_to_cpu(dd_xz->dd_magic) == MICROFS_DD_XZ_MAGIC) {
xz_data->d_opts.dict_size = __le32_to_cpu(dd_xz->dd_dictsz);
if (xz_data->d_opts.dict_size >= LZMA_DICT_SIZE_MIN)
err = 0;
}
return err;
}
static int hostprog_lib_xz_compress(void* data, void* destbuf, __u32* destbufsz,
void* srcbuf, __u32 srcbufsz, int* implerr)
{
struct hostprog_lib_xz_data* xz_data = data;
struct hostprog_lib_xz_filter* best_filter = NULL;
xz_data->d_filters[0].f_buf = destbuf;
for (int i = 0; xz_data->d_filters[i].f_buf; i++) {
struct hostprog_lib_xz_filter* curr_filter = &xz_data->d_filters[i];
curr_filter->f_bufsz = 0;
*implerr = lzma_stream_buffer_encode(curr_filter->f_backends,
LZMA_CHECK_CRC32, NULL,
srcbuf, srcbufsz,
curr_filter->f_buf, &curr_filter->f_bufsz,
*destbufsz);
if (*implerr == LZMA_OK) {
if (!best_filter || curr_filter->f_bufsz < best_filter->f_bufsz)
best_filter = curr_filter;
} else {
goto err;
}
}
*destbufsz = best_filter->f_bufsz;
if(best_filter->f_buf != destbuf)
memcpy(destbuf, best_filter->f_buf, best_filter->f_bufsz);
err:
return *implerr == LZMA_OK ? 0 : -1;
}
static int hostprog_lib_xz_decompress(void* data, void* destbuf, __u32* destbufsz,
void* srcbuf, __u32 srcbufsz, int* implerr)
{
(void)data;
size_t srcbufpos = 0;
size_t destbufpos = 0;
uint64_t memlimit = 1 << 26;
*implerr = lzma_stream_buffer_decode(&memlimit, 0, NULL,
srcbuf, &srcbufpos, srcbufsz, destbuf, &destbufpos, *destbufsz);
*destbufsz = destbufpos;
return *implerr == LZMA_OK && srcbufsz == srcbufpos ? 0 : -1;
}
static __u32 hostprog_lib_xz_upperbound(void* data, __u32 size)
{
(void)data;
return lzma_stream_buffer_bound(size);
}
static const char* hostprog_lib_xz_strerror(void* data, int implerr)
{
(void)data;
switch (implerr) {
#define XZ_STRERROR(Err) \
case Err: return #Err;
XZ_STRERROR(LZMA_OK);
XZ_STRERROR(LZMA_FORMAT_ERROR);
XZ_STRERROR(LZMA_OPTIONS_ERROR);
XZ_STRERROR(LZMA_DATA_ERROR);
XZ_STRERROR(LZMA_NO_CHECK);
XZ_STRERROR(LZMA_UNSUPPORTED_CHECK);
XZ_STRERROR(LZMA_MEM_ERROR);
XZ_STRERROR(LZMA_MEMLIMIT_ERROR);
XZ_STRERROR(LZMA_BUF_ERROR);
XZ_STRERROR(LZMA_PROG_ERROR);
#undef XZ_STRERROR
default:
return "Unknown error";
}
}
const struct hostprog_lib hostprog_lib_xz = {
.hl_info = &libinfo_xz,
.hl_compiled = 1,
.hl_init = hostprog_lib_xz_init,
.hl_mk_usage = hostprog_lib_xz_mk_usage,
.hl_mk_option = hostprog_lib_xz_mk_option,
.hl_mk_dd = hostprog_lib_xz_mk_dd,
.hl_ck_dd = hostprog_lib_xz_ck_dd,
.hl_compress = hostprog_lib_xz_compress,
.hl_decompress = hostprog_lib_xz_decompress,
.hl_upperbound = hostprog_lib_xz_upperbound,
.hl_strerror = hostprog_lib_xz_strerror
};
#else
const struct hostprog_lib hostprog_lib_xz = {
.hl_info = &libinfo_xz,
.hl_compiled = 0
};
#endif