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libkmod: Move xz-related functions to separate file
Move xz-related function to a separate file so it's easier to isolate the dependency on each decompression library. Declare struct kmod_file in a shared libkmod-internal-file.h that will be included only by sources implementing kmod_file decompression routines. Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Link: https://github.com/kmod-project/kmod/pull/58 Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>
This commit is contained in:
Lucas De Marchi
parent
d4d3df1089
commit
929ca4c92a
@ -63,6 +63,7 @@ lib_LTLIBRARIES = libkmod/libkmod.la
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libkmod_libkmod_la_SOURCES = \
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libkmod/libkmod.h \
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libkmod/libkmod-internal-file.h \
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libkmod/libkmod-internal.h \
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libkmod/libkmod.c \
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libkmod/libkmod-builtin.c \
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@ -75,6 +76,10 @@ libkmod_libkmod_la_SOURCES = \
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libkmod/libkmod-elf.c \
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libkmod/libkmod-signature.c
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if ENABLE_XZ
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libkmod_libkmod_la_SOURCES += libkmod/libkmod-file-xz.c
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endif
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EXTRA_DIST += libkmod/libkmod.sym
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EXTRA_DIST += libkmod/README \
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libkmod/COPYING testsuite/COPYING tools/COPYING COPYING
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@ -137,6 +137,7 @@ AS_IF([test "x$with_xz" != "xno"], [
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AC_MSG_NOTICE([Xz support not requested])
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])
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CC_FEATURE_APPEND([with_features], [with_xz], [XZ])
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AM_CONDITIONAL([ENABLE_XZ], [test "x$with_xz" != "xno"])
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AC_ARG_WITH([zlib],
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AS_HELP_STRING([--with-zlib], [handle gzipped modules @<:@default=disabled@:>@]),
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116
libkmod/libkmod-file-xz.c
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116
libkmod/libkmod-file-xz.c
Normal file
@ -0,0 +1,116 @@
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/*
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* Copyright © 2024 Intel Corporation
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*/
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#include <errno.h>
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#include <lzma.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <shared/util.h>
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#include "libkmod.h"
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#include "libkmod-internal.h"
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#include "libkmod-internal-file.h"
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static void xz_uncompress_belch(struct kmod_file *file, lzma_ret ret)
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{
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switch (ret) {
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case LZMA_MEM_ERROR:
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ERR(file->ctx, "xz: %s\n", strerror(ENOMEM));
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break;
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case LZMA_FORMAT_ERROR:
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ERR(file->ctx, "xz: File format not recognized\n");
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break;
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case LZMA_OPTIONS_ERROR:
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ERR(file->ctx, "xz: Unsupported compression options\n");
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break;
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case LZMA_DATA_ERROR:
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ERR(file->ctx, "xz: File is corrupt\n");
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break;
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case LZMA_BUF_ERROR:
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ERR(file->ctx, "xz: Unexpected end of input\n");
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break;
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default:
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ERR(file->ctx, "xz: Internal error (bug)\n");
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break;
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}
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}
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static int xz_uncompress(lzma_stream *strm, struct kmod_file *file)
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{
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uint8_t in_buf[BUFSIZ], out_buf[BUFSIZ];
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lzma_action action = LZMA_RUN;
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lzma_ret ret;
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void *p = NULL;
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size_t total = 0;
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strm->avail_in = 0;
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strm->next_out = out_buf;
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strm->avail_out = sizeof(out_buf);
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while (true) {
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if (strm->avail_in == 0) {
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ssize_t rdret = read(file->fd, in_buf, sizeof(in_buf));
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if (rdret < 0) {
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ret = -errno;
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goto out;
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}
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strm->next_in = in_buf;
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strm->avail_in = rdret;
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if (rdret == 0)
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action = LZMA_FINISH;
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}
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ret = lzma_code(strm, action);
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if (strm->avail_out == 0 || ret != LZMA_OK) {
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size_t write_size = BUFSIZ - strm->avail_out;
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char *tmp = realloc(p, total + write_size);
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if (tmp == NULL) {
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ret = -errno;
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goto out;
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}
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memcpy(tmp + total, out_buf, write_size);
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total += write_size;
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p = tmp;
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strm->next_out = out_buf;
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strm->avail_out = BUFSIZ;
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}
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if (ret == LZMA_STREAM_END)
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break;
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if (ret != LZMA_OK) {
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xz_uncompress_belch(file, ret);
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ret = -EINVAL;
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goto out;
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}
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}
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file->memory = p;
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file->size = total;
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return 0;
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out:
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free(p);
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return ret;
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}
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int kmod_file_load_xz(struct kmod_file *file)
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{
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lzma_stream strm = LZMA_STREAM_INIT;
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lzma_ret lzret;
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int ret;
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lzret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
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if (lzret == LZMA_MEM_ERROR) {
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ERR(file->ctx, "xz: %s\n", strerror(ENOMEM));
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return -ENOMEM;
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} else if (lzret != LZMA_OK) {
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ERR(file->ctx, "xz: Internal error (bug)\n");
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return -EINVAL;
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}
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ret = xz_uncompress(&strm, file);
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lzma_end(&strm);
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return ret;
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}
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@ -29,9 +29,6 @@
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#ifdef ENABLE_ZSTD
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#include <zstd.h>
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#endif
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#ifdef ENABLE_XZ
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#include <lzma.h>
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#endif
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#ifdef ENABLE_ZLIB
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#include <zlib.h>
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#endif
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@ -40,16 +37,7 @@
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#include "libkmod.h"
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#include "libkmod-internal.h"
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struct kmod_file {
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int fd;
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enum kmod_file_compression_type compression;
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off_t size;
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void *memory;
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int (*load)(struct kmod_file *file);
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const struct kmod_ctx *ctx;
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struct kmod_elf *elf;
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};
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#include "libkmod-internal-file.h"
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#ifdef ENABLE_ZSTD
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static int zstd_read_block(struct kmod_file *file, size_t block_size,
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@ -186,111 +174,6 @@ static int load_zstd(struct kmod_file *file)
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#endif
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static const char magic_zstd[] = {0x28, 0xB5, 0x2F, 0xFD};
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#ifdef ENABLE_XZ
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static void xz_uncompress_belch(struct kmod_file *file, lzma_ret ret)
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{
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switch (ret) {
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case LZMA_MEM_ERROR:
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ERR(file->ctx, "xz: %s\n", strerror(ENOMEM));
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break;
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case LZMA_FORMAT_ERROR:
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ERR(file->ctx, "xz: File format not recognized\n");
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break;
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case LZMA_OPTIONS_ERROR:
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ERR(file->ctx, "xz: Unsupported compression options\n");
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break;
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case LZMA_DATA_ERROR:
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ERR(file->ctx, "xz: File is corrupt\n");
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break;
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case LZMA_BUF_ERROR:
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ERR(file->ctx, "xz: Unexpected end of input\n");
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break;
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default:
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ERR(file->ctx, "xz: Internal error (bug)\n");
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break;
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}
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}
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static int xz_uncompress(lzma_stream *strm, struct kmod_file *file)
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{
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uint8_t in_buf[BUFSIZ], out_buf[BUFSIZ];
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lzma_action action = LZMA_RUN;
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lzma_ret ret;
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void *p = NULL;
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size_t total = 0;
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strm->avail_in = 0;
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strm->next_out = out_buf;
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strm->avail_out = sizeof(out_buf);
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while (true) {
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if (strm->avail_in == 0) {
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ssize_t rdret = read(file->fd, in_buf, sizeof(in_buf));
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if (rdret < 0) {
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ret = -errno;
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goto out;
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}
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strm->next_in = in_buf;
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strm->avail_in = rdret;
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if (rdret == 0)
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action = LZMA_FINISH;
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}
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ret = lzma_code(strm, action);
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if (strm->avail_out == 0 || ret != LZMA_OK) {
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size_t write_size = BUFSIZ - strm->avail_out;
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char *tmp = realloc(p, total + write_size);
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if (tmp == NULL) {
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ret = -errno;
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goto out;
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}
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memcpy(tmp + total, out_buf, write_size);
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total += write_size;
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p = tmp;
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strm->next_out = out_buf;
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strm->avail_out = BUFSIZ;
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}
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if (ret == LZMA_STREAM_END)
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break;
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if (ret != LZMA_OK) {
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xz_uncompress_belch(file, ret);
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ret = -EINVAL;
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goto out;
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}
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}
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file->memory = p;
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file->size = total;
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return 0;
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out:
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free(p);
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return ret;
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}
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static int load_xz(struct kmod_file *file)
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{
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lzma_stream strm = LZMA_STREAM_INIT;
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lzma_ret lzret;
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int ret;
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lzret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
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if (lzret == LZMA_MEM_ERROR) {
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ERR(file->ctx, "xz: %s\n", strerror(ENOMEM));
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return -ENOMEM;
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} else if (lzret != LZMA_OK) {
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ERR(file->ctx, "xz: Internal error (bug)\n");
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return -EINVAL;
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}
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ret = xz_uncompress(&strm, file);
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lzma_end(&strm);
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return ret;
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}
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#else
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static int load_xz(struct kmod_file *file)
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{
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return -ENOSYS;
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}
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#endif
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static const char magic_xz[] = {0xfd, '7', 'z', 'X', 'Z', 0};
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#ifdef ENABLE_ZLIB
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@ -387,7 +270,7 @@ static const struct comp_type {
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int (*load)(struct kmod_file *file);
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} comp_types[] = {
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{sizeof(magic_zstd), KMOD_FILE_COMPRESSION_ZSTD, magic_zstd, load_zstd},
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{sizeof(magic_xz), KMOD_FILE_COMPRESSION_XZ, magic_xz, load_xz},
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{sizeof(magic_xz), KMOD_FILE_COMPRESSION_XZ, magic_xz, kmod_file_load_xz},
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{sizeof(magic_zlib), KMOD_FILE_COMPRESSION_ZLIB, magic_zlib, load_zlib},
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{0, KMOD_FILE_COMPRESSION_NONE, NULL, load_reg}
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};
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27
libkmod/libkmod-internal-file.h
Normal file
27
libkmod/libkmod-internal-file.h
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@ -0,0 +1,27 @@
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/*
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* Copyright © 2024 Intel Corporation
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*/
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#include <errno.h>
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#include <libkmod/libkmod-internal.h>
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struct kmod_ctx;
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struct kmod_elf;
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struct kmod_file {
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int fd;
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enum kmod_file_compression_type compression;
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off_t size;
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void *memory;
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int (*load)(struct kmod_file *file);
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const struct kmod_ctx *ctx;
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struct kmod_elf *elf;
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};
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#ifdef ENABLE_XZ
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int kmod_file_load_xz(struct kmod_file *file);
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#else
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static inline int kmod_file_load_xz(struct kmod_file *file) { return -ENOSYS; }
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#endif
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