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https://github.com/topjohnwu/Magisk.git
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321 lines
11 KiB
C
321 lines
11 KiB
C
/*
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* Copyright (C) 2013 Jorrit "Chainfire" Jongma
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* Copyright (C) 2013 The OmniROM Project
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*/
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/*
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* This file is part of OpenDelta.
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*
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* OpenDelta is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* OpenDelta is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenDelta. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <zlib.h>
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#ifndef O_BINARY
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#define O_BINARY 0
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#define O_TEXT 0
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#endif
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#pragma pack(1)
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struct local_header_struct {
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uint32_t signature;
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uint16_t extract_version;
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uint16_t flags;
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uint16_t compression_method;
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uint16_t last_modified_time;
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uint16_t last_modified_date;
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uint32_t crc32;
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uint32_t size_compressed;
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uint32_t size_uncompressed;
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uint16_t length_filename;
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uint16_t length_extra;
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// filename
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// extra
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};
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typedef struct local_header_struct local_header_t;
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#pragma pack(1)
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struct data_descriptor_struct {
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uint32_t signature;
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uint32_t crc32;
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uint32_t size_compressed;
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uint32_t size_uncompressed;
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};
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typedef struct data_descriptor_struct data_descriptor_t;
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#pragma pack(1)
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struct central_header_struct {
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uint32_t signature;
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uint16_t version_made;
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uint16_t version_needed;
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uint16_t flags;
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uint16_t compression_method;
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uint16_t last_modified_time;
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uint16_t last_modified_date;
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uint32_t crc32;
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uint32_t size_compressed;
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uint32_t size_uncompressed;
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uint16_t length_filename;
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uint16_t length_extra;
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uint16_t length_comment;
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uint16_t disk_start;
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uint16_t attr_internal;
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uint32_t attr_external;
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uint32_t offset;
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// filename
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// extra
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// comment
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};
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typedef struct central_header_struct central_header_t;
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#pragma pack(1)
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struct central_footer_struct {
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uint32_t signature;
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uint16_t disk_number;
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uint16_t disk_number_central_directory;
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uint16_t central_directory_entries_this_disk;
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uint16_t central_directory_entries_total;
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uint32_t central_directory_size;
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uint32_t central_directory_offset;
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uint16_t length_comment;
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// comment
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};
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typedef struct central_footer_struct central_footer_t;
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#define MAGIC_LOCAL_HEADER 0x04034b50
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#define MAGIC_DATA_DESCRIPTOR 0x08074b50
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#define MAGIC_CENTRAL_HEADER 0x02014b50
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#define MAGIC_CENTRAL_FOOTER 0x06054b50
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static int xerror(char* message) {
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fprintf(stderr, "%s\n", message);
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return 0;
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}
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static int xseekread(int fd, off_t offset, void* buf, size_t bytes) {
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if (lseek(fd, offset, SEEK_SET) == (off_t)-1) return xerror("Seek failed");
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if (read(fd, buf, bytes) != bytes) return xerror("Read failed");
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return 1;
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}
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static int xseekwrite(int fd, off_t offset, void* buf, size_t bytes) {
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if (lseek(fd, offset, SEEK_SET) == (off_t)-1) return xerror("Seek failed");
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if (write(fd, buf, bytes) != bytes) return xerror("Write failed");
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return 1;
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}
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static int xfilecopy(int fdIn, int fdOut, off_t offsetIn, off_t offsetOut, size_t bytes) {
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if ((offsetIn != (off_t)-1) && (lseek(fdIn, offsetIn, SEEK_SET) == (off_t)-1)) return xerror("Seek failed");
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if ((offsetOut != (off_t)-1) && (lseek(fdOut, offsetOut, SEEK_SET) == (off_t)-1)) return xerror("Seek failed");
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int CHUNK = 256 * 1024;
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void* buf = malloc(CHUNK);
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if (buf == NULL) return xerror("malloc failed");
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size_t left = bytes;
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while (left > 0) {
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size_t wanted = (left < CHUNK) ? left : CHUNK;
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size_t r = read(fdIn, buf, wanted);
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if (r <= 0) return xerror("Read failed");
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if (write(fdOut, buf, r) != r) return xerror("Write failed");
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left -= r;
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}
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free(buf);
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return 1;
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}
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static int xdecompress(int fdIn, int fdOut, off_t offsetIn, off_t offsetOut, size_t bytes) {
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if ((offsetIn != (off_t)-1) && (lseek(fdIn, offsetIn, SEEK_SET) == (off_t)-1)) return xerror("Seek failed");
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if ((offsetOut != (off_t)-1) && (lseek(fdOut, offsetOut, SEEK_SET) == (off_t)-1)) return xerror("Seek failed");
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int CHUNK = 256 * 1024;
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int ret;
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unsigned have;
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z_stream strm;
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unsigned char in[CHUNK];
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unsigned char out[CHUNK];
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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strm.avail_in = 0;
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strm.next_in = Z_NULL;
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ret = inflateInit2(&strm, -15);
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if (ret != Z_OK) return xerror("ret != Z_OK");
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do {
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strm.avail_in = read(fdIn, in, CHUNK);
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if (strm.avail_in == 0) break;
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strm.next_in = in;
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do {
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strm.avail_out = CHUNK;
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strm.next_out = out;
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ret = inflate(&strm, Z_NO_FLUSH);
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if (ret == Z_STREAM_ERROR) return xerror("Stream error");
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switch (ret) {
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case Z_NEED_DICT:
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ret = Z_DATA_ERROR;
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case Z_DATA_ERROR:
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case Z_MEM_ERROR:
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(void)inflateEnd(&strm);
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return xerror("DICT/DATA/MEM error");
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}
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have = CHUNK - strm.avail_out;
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if (write(fdOut, out, have) != have) {
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(void)inflateEnd(&strm);
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return xerror("Write failed");
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}
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} while (strm.avail_out == 0);
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} while (ret != Z_STREAM_END);
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(void)inflateEnd(&strm);
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return ret == Z_STREAM_END ? 1 : 0;
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}
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int zipadjust(char* filenameIn, char* filenameOut, int decompress) {
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int ok = 0;
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int fin = open(filenameIn, O_RDONLY | O_BINARY);
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if (fin > 0) {
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unsigned int size = lseek(fin, 0, SEEK_END);
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lseek(fin, 0, SEEK_SET);
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printf("%d bytes\n", size);
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char filename[1024];
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central_footer_t central_footer;
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uint32_t central_directory_in_position = 0;
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uint32_t central_directory_in_size = 0;
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uint32_t central_directory_out_size = 0;
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int i;
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for (i = size - 4; i >= 0; i--) {
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uint32_t magic = 0;
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if (!xseekread(fin, i, &magic, sizeof(uint32_t))) return 0;
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if (magic == MAGIC_CENTRAL_FOOTER) {
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printf("central footer @ %08X\n", i);
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if (!xseekread(fin, i, ¢ral_footer, sizeof(central_footer_t))) return 0;
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central_header_t central_header;
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if (!xseekread(fin, central_footer.central_directory_offset, ¢ral_header, sizeof(central_header_t))) return 0;
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if ( central_header.signature == MAGIC_CENTRAL_HEADER ) {
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central_directory_in_position = central_footer.central_directory_offset;
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central_directory_in_size = size - central_footer.central_directory_offset;
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printf("central header @ %08X (%d)\n", central_footer.central_directory_offset, central_footer.central_directory_size);
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break;
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}
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}
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}
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if (central_directory_in_position == 0) return 0;
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unsigned char* central_directory_in = (unsigned char*)malloc(central_directory_in_size);
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unsigned char* central_directory_out = (unsigned char*)malloc(central_directory_in_size);
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if (!xseekread(fin, central_directory_in_position, central_directory_in, central_directory_in_size)) return 0;
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memset(central_directory_out, 0, central_directory_in_size);
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unlink(filenameOut);
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int fout = open(filenameOut, O_CREAT | O_WRONLY | O_BINARY, 0644);
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if (fout > 0) {
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uintptr_t central_directory_in_index = 0;
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uintptr_t central_directory_out_index = 0;
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central_header_t* central_header = NULL;
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local_header_t local_header;
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uint32_t out_index = 0;
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while (1) {
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central_header = (central_header_t*)¢ral_directory_in[central_directory_in_index];
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if (central_header->signature != MAGIC_CENTRAL_HEADER) break;
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filename[central_header->length_filename] = (char)0;
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memcpy(filename, ¢ral_directory_in[central_directory_in_index + sizeof(central_header_t)], central_header->length_filename);
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printf("%s (%d --> %d) [%08X] (%d)\n", filename, central_header->size_uncompressed, central_header->size_compressed, central_header->crc32, central_header->length_extra + central_header->length_comment);
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local_header_t local_header;
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if (!xseekread(fin, central_header->offset, &local_header, sizeof(local_header_t))) return 0;
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// save and update to next index before we clobber the data
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uint16_t compression_method_old = central_header->compression_method;
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uint32_t size_compressed_old = central_header->size_compressed;
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uint32_t offset_old = central_header->offset;
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uint32_t length_extra_old = central_header->length_extra;
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central_directory_in_index += sizeof(central_header_t) + central_header->length_filename + central_header->length_extra + central_header->length_comment;
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// copying, rewriting, and correcting local and central headers so all the information matches, and no data descriptors are necessary
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central_header->offset = out_index;
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central_header->flags = central_header->flags & !8;
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if (decompress && (compression_method_old == 8)) {
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central_header->compression_method = 0;
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central_header->size_compressed = central_header->size_uncompressed;
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}
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central_header->length_extra = 0;
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central_header->length_comment = 0;
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local_header.compression_method = central_header->compression_method;
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local_header.flags = central_header->flags;
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local_header.crc32 = central_header->crc32;
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local_header.size_uncompressed = central_header->size_uncompressed;
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local_header.size_compressed = central_header->size_compressed;
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local_header.length_extra = 0;
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if (!xseekwrite(fout, out_index, &local_header, sizeof(local_header_t))) return 0;
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out_index += sizeof(local_header_t);
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if (!xseekwrite(fout, out_index, &filename[0], central_header->length_filename)) return 0;
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out_index += central_header->length_filename;
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if (decompress && (compression_method_old == 8)) {
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if (!xdecompress(fin, fout, offset_old + sizeof(local_header_t) + central_header->length_filename + length_extra_old, out_index, size_compressed_old)) return 0;
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} else {
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if (!xfilecopy(fin, fout, offset_old + sizeof(local_header_t) + central_header->length_filename + length_extra_old, out_index, size_compressed_old)) return 0;
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}
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out_index += local_header.size_compressed;
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memcpy(¢ral_directory_out[central_directory_out_index], central_header, sizeof(central_header_t) + central_header->length_filename);
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central_directory_out_index += sizeof(central_header_t) + central_header->length_filename;
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}
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central_directory_out_size = central_directory_out_index;
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central_footer.central_directory_size = central_directory_out_size;
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central_footer.central_directory_offset = out_index;
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central_footer.length_comment = 0;
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if (!xseekwrite(fout, out_index, central_directory_out, central_directory_out_size)) return 0;
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out_index += central_directory_out_size;
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if (!xseekwrite(fout, out_index, ¢ral_footer, sizeof(central_footer_t))) return 0;
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printf("central header @ %08X (%d)\n", central_footer.central_directory_offset, central_footer.central_directory_size);
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printf("central footer @ %08X\n", out_index);
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close(fout);
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ok = 1;
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}
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free(central_directory_in);
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free(central_directory_out);
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close(fin);
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}
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return ok;
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}
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