mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-30 21:45:27 +00:00
572 lines
12 KiB
C
572 lines
12 KiB
C
#include <zlib.h>
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#include <lzma.h>
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#include <lz4.h>
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#include <lz4frame.h>
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#include <bzlib.h>
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#include "magiskboot.h"
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#define windowBits 15
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#define ZLIB_GZIP 16
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#define memLevel 8
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#define CHUNK 0x40000
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#define LZ4_HEADER_SIZE 19
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#define LZ4_FOOTER_SIZE 4
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#define LZ4_LEGACY_BLOCKSIZE 0x800000
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static void write_file(const int fd, const void *buf, const size_t size, const char *filename) {
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if (write(fd, buf, size) != size)
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error(1, "Error in writing %s", filename);
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}
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static void report(const int mode, const char* filename) {
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switch(mode) {
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case 0:
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printf("Decompressing to [%s]\n\n", filename);
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break;
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default:
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printf("Compressing to [%s]\n\n", filename);
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break;
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}
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}
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// Mode: 0 = decode; 1 = encode
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void gzip(int mode, const char* filename, const unsigned char* buf, size_t size) {
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size_t ret = 0, flush, have, pos = 0;
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z_stream strm;
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unsigned char out[CHUNK];
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report(mode, filename);
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int fd = open_new(filename);
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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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switch(mode) {
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case 0:
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ret = inflateInit2(&strm, windowBits | ZLIB_GZIP);
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break;
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case 1:
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ret = deflateInit2(&strm, 9, Z_DEFLATED, windowBits | ZLIB_GZIP, memLevel, Z_DEFAULT_STRATEGY);
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break;
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default:
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error(1, "Unsupported gzip mode!");
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}
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if (ret != Z_OK)
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error(1, "Unable to init zlib stream");
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do {
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strm.next_in = buf + pos;
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if (pos + CHUNK >= size) {
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strm.avail_in = size - pos;
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flush = Z_FINISH;
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} else {
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strm.avail_in = CHUNK;
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flush = Z_NO_FLUSH;
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}
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pos += strm.avail_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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switch(mode) {
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case 0:
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ret = inflate(&strm, flush);
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break;
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case 1:
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ret = deflate(&strm, flush);
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break;
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}
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if (ret == Z_STREAM_ERROR)
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error(1, "Error when running gzip");
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have = CHUNK - strm.avail_out;
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write_file(fd, out, have, filename);
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} while (strm.avail_out == 0);
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} while(pos < size);
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switch(mode) {
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case 0:
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inflateEnd(&strm);
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break;
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case 1:
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deflateEnd(&strm);
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break;
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}
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close(fd);
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}
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// Mode: 0 = decode xz/lzma; 1 = encode xz; 2 = encode lzma
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void lzma(int mode, const char* filename, const unsigned char* buf, size_t size) {
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size_t have, pos = 0;
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lzma_ret ret = 0;
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lzma_stream strm = LZMA_STREAM_INIT;
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lzma_options_lzma opt;
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lzma_action action;
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unsigned char out[BUFSIZ];
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report(mode, filename);
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int fd = open_new(filename);
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// Initialize preset
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lzma_lzma_preset(&opt, LZMA_PRESET_DEFAULT);
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lzma_filter filters[] = {
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{ .id = LZMA_FILTER_LZMA2, .options = &opt },
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{ .id = LZMA_VLI_UNKNOWN, .options = NULL },
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};
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switch(mode) {
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case 0:
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ret = lzma_auto_decoder(&strm, UINT64_MAX, 0);
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break;
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case 1:
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ret = lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC64);
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break;
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case 2:
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ret = lzma_alone_encoder(&strm, &opt);
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break;
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default:
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error(1, "Unsupported lzma mode!");
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}
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if (ret != LZMA_OK)
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error(1, "Unable to init lzma stream");
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do {
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strm.next_in = buf + pos;
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if (pos + BUFSIZ >= size) {
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strm.avail_in = size - pos;
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action = LZMA_FINISH;
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} else {
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strm.avail_in = BUFSIZ;
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action = LZMA_RUN;
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}
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pos += strm.avail_in;
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do {
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strm.avail_out = BUFSIZ;
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strm.next_out = out;
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ret = lzma_code(&strm, action);
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have = BUFSIZ - strm.avail_out;
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write_file(fd, out, have, filename);
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} while (strm.avail_out == 0 && ret == LZMA_OK);
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if (ret != LZMA_OK && ret != LZMA_STREAM_END)
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error(1, "LZMA error %d!", ret);
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} while (pos < size);
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lzma_end(&strm);
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close(fd);
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}
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// Mode: 0 = decode; 1 = encode
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void lz4(int mode, const char* filename, const unsigned char* buf, size_t size) {
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LZ4F_decompressionContext_t dctx;
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LZ4F_compressionContext_t cctx;
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LZ4F_frameInfo_t info;
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size_t outCapacity, avail_in, ret = 0, pos = 0;
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size_t have, read;
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unsigned char *out = NULL;
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report(mode, filename);
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int fd = open_new(filename);
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// Initialize context
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switch(mode) {
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case 0:
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ret = LZ4F_createDecompressionContext(&dctx, LZ4F_VERSION);
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break;
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case 1:
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ret = LZ4F_createCompressionContext(&cctx, LZ4F_VERSION);
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break;
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default:
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error(1, "Unsupported lz4 mode!");
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}
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if (LZ4F_isError(ret))
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error(1, "Context creation error: %s\n", LZ4F_getErrorName(ret));
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// Allocate out buffer
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switch(mode) {
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case 0:
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// Read header
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read = CHUNK;
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ret = LZ4F_getFrameInfo(dctx, &info, buf, &read);
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if (LZ4F_isError(ret))
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error(1, "LZ4F_getFrameInfo error: %s\n", LZ4F_getErrorName(ret));
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switch (info.blockSizeID) {
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case LZ4F_default:
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case LZ4F_max64KB: outCapacity = 1 << 16; break;
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case LZ4F_max256KB: outCapacity = 1 << 18; break;
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case LZ4F_max1MB: outCapacity = 1 << 20; break;
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case LZ4F_max4MB: outCapacity = 1 << 22; break;
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default:
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error(1, "Impossible unless more block sizes are allowed\n");
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}
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pos += read;
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break;
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case 1:
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outCapacity = LZ4F_compressBound(CHUNK, NULL) + LZ4_HEADER_SIZE + LZ4_FOOTER_SIZE;
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break;
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}
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out = malloc(outCapacity);
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if (!out)
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error(1, "LZ4 malloc error!");
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// Write header
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if (mode == 1) {
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have = ret = LZ4F_compressBegin(cctx, out, size, NULL);
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if (LZ4F_isError(ret))
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error(1, "Failed to start compression: error %s\n", LZ4F_getErrorName(ret));
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write_file(fd, out, have, filename);
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}
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do {
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if (pos + CHUNK >= size) {
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avail_in = size - pos;
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} else {
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avail_in = CHUNK;
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}
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do {
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switch(mode) {
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case 0:
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have = outCapacity, read = avail_in;
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ret = LZ4F_decompress(dctx, out, &have, buf + pos, &read, NULL);
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break;
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case 1:
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read = avail_in;
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have = ret = LZ4F_compressUpdate(cctx, out, outCapacity, buf + pos, avail_in, NULL);
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break;
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}
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if (LZ4F_isError(ret))
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error(1, "LZ4 coding error: %s\n", LZ4F_getErrorName(ret));
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write_file(fd, out, have, filename);
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// Update status
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pos += read;
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avail_in -= read;
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} while(avail_in != 0 && ret != 0);
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} while(pos < size && ret != 0);
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switch(mode) {
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case 0:
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LZ4F_freeDecompressionContext(dctx);
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break;
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case 1:
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have = ret = LZ4F_compressEnd(cctx, out, outCapacity, NULL);
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if (LZ4F_isError(ret))
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error(1, "Failed to end compression: error %s\n", LZ4F_getErrorName(ret));
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write_file(fd, out, have, filename);
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LZ4F_freeCompressionContext(cctx);
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break;
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}
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free(out);
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close(fd);
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}
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// Mode: 0 = decode; 1 = encode
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void bzip2(int mode, const char* filename, const unsigned char* buf, size_t size) {
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size_t ret = 0, action, have, pos = 0;
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bz_stream strm;
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char out[CHUNK];
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report(mode, filename);
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int fd = open_new(filename);
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strm.bzalloc = NULL;
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strm.bzfree = NULL;
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strm.opaque = NULL;
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switch(mode) {
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case 0:
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ret = BZ2_bzDecompressInit(&strm, 0, 0);
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break;
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case 1:
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ret = BZ2_bzCompressInit(&strm, 9, 0, 0);
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break;
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default:
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error(1, "Unsupported bzip2 mode!");
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}
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if (ret != BZ_OK)
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error(1, "Unable to init bzlib stream");
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do {
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strm.next_in = (char *) buf + pos;
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if (pos + CHUNK >= size) {
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strm.avail_in = size - pos;
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action = BZ_FINISH;
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} else {
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strm.avail_in = CHUNK;
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action = BZ_RUN;
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}
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pos += strm.avail_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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switch(mode) {
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case 0:
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ret = BZ2_bzDecompress(&strm);
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break;
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case 1:
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ret = BZ2_bzCompress(&strm, action);
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break;
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}
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have = CHUNK - strm.avail_out;
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write_file(fd, out, have, filename);
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} while (strm.avail_out == 0);
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} while(pos < size);
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switch(mode) {
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case 0:
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BZ2_bzDecompressEnd(&strm);
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break;
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case 1:
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BZ2_bzCompressEnd(&strm);
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break;
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}
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close(fd);
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}
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// Mode: 0 = decode; 1 = encode
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void lz4_legacy(int mode, const char* filename, const unsigned char* buf, size_t size) {
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size_t pos = 0;
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int have;
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char *out;
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unsigned block_size, insize;
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unsigned char block_size_le[4];
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report(mode, filename);
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int fd = open_new(filename);
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switch(mode) {
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case 0:
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out = malloc(LZ4_LEGACY_BLOCKSIZE);
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// Skip magic
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pos += 4;
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break;
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case 1:
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out = malloc(LZ4_COMPRESSBOUND(LZ4_LEGACY_BLOCKSIZE));
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// Write magic
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write_file(fd, "\x02\x21\x4c\x18", 4, filename);
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break;
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default:
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error(1, "Unsupported lz4_legacy mode!");
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}
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if (!out)
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error(1, "lz4_legacy malloc error");
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do {
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switch(mode) {
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case 0:
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block_size = buf[pos];
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block_size += (buf[pos + 1]<<8);
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block_size += (buf[pos + 2]<<16);
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block_size += ((unsigned)buf[pos + 3])<<24;
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pos += 4;
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if (block_size > LZ4_COMPRESSBOUND(LZ4_LEGACY_BLOCKSIZE))
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error(1, "lz4_legacy block size too large!");
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have = LZ4_decompress_safe((const char*) (buf + pos), out, block_size, LZ4_LEGACY_BLOCKSIZE);
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if (have < 0)
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error(1, "Cannot decode lz4_legacy block");
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pos += block_size;
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break;
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case 1:
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if (pos + LZ4_LEGACY_BLOCKSIZE >= size)
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insize = size - pos;
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else
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insize = LZ4_LEGACY_BLOCKSIZE;
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have = LZ4_compress_default((const char*) (buf + pos), out, insize, LZ4_COMPRESSBOUND(LZ4_LEGACY_BLOCKSIZE));
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if (have == 0)
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error(1, "lz4_legacy compression error");
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pos += insize;
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block_size_le[0] = (unsigned char)have;
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block_size_le[1] = (unsigned char)(have >> 8);
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block_size_le[2] = (unsigned char)(have >> 16);
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block_size_le[3] = (unsigned char)(have >> 24);
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write_file(fd, block_size_le, 4, filename);
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break;
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}
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// Write main data
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write_file(fd, out, have, filename);
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} while(pos < size);
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free(out);
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close(fd);
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}
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int decomp(file_t type, const char *to, const unsigned char *from, size_t size) {
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switch (type) {
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case GZIP:
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gzip(0, to, from, size);
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break;
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case XZ:
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lzma(0, to, from, size);
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break;
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case LZMA:
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lzma(0, to, from, size);
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break;
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case BZIP2:
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bzip2(0, to, from, size);
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break;
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case LZ4:
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lz4(0, to, from, size);
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break;
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case LZ4_LEGACY:
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lz4_legacy(0, to, from, size);
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break;
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default:
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// Unsupported
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return 1;
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}
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return 0;
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}
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// Output will be to.ext
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int comp(file_t type, const char *to, const unsigned char *from, size_t size) {
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char name[PATH_MAX];
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const char *ext = strrchr(to, '.');
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if (ext == NULL) ext = to;
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strcpy(name, to);
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switch (type) {
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case GZIP:
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if (strcmp(ext, ".gz") != 0)
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sprintf(name, "%s.%s", to, "gz");
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gzip(1, name, from, size);
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break;
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case XZ:
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if (strcmp(ext, ".xz") != 0)
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sprintf(name, "%s.%s", to, "xz");
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lzma(1, name, from, size);
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break;
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case LZMA:
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if (strcmp(ext, ".lzma") != 0)
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sprintf(name, "%s.%s", to, "lzma");
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lzma(2, name, from, size);
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break;
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case BZIP2:
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if (strcmp(ext, ".bz2") != 0)
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sprintf(name, "%s.%s", to, "bz2");
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bzip2(1, name, from, size);
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break;
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case LZ4:
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if (strcmp(ext, ".lz4") != 0)
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sprintf(name, "%s.%s", to, "lz4");
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lz4(1, name, from, size);
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break;
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case LZ4_LEGACY:
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if (strcmp(ext, ".lz4") != 0)
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sprintf(name, "%s.%s", to, "lz4");
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lz4_legacy(1, name, from, size);
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break;
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default:
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// Unsupported
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return 1;
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}
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return 0;
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}
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void decomp_file(char *from, const char *to) {
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int ok = 1;
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unsigned char *file;
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size_t size;
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mmap_ro(from, &file, &size);
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file_t type = check_type(file);
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char *ext;
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ext = strrchr(from, '.');
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if (ext == NULL)
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error(1, "Bad filename extention");
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// File type and extension should match
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switch (type) {
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case GZIP:
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if (strcmp(ext, ".gz") != 0)
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ok = 0;
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break;
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case XZ:
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if (strcmp(ext, ".xz") != 0)
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ok = 0;
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break;
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case LZMA:
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if (strcmp(ext, ".lzma") != 0)
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ok = 0;
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break;
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case BZIP2:
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if (strcmp(ext, ".bz2") != 0)
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ok = 0;
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break;
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case LZ4_LEGACY:
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case LZ4:
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if (strcmp(ext, ".lz4") != 0)
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ok = 0;
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break;
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default:
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error(1, "Provided file \'%s\' is not a supported archive format", from);
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}
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if (ok) {
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// If all match, strip out the suffix
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if (!to) {
|
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*ext = '\0';
|
|
to = from;
|
|
}
|
|
decomp(type, to, file, size);
|
|
if (to == from) {
|
|
*ext = '.';
|
|
unlink(from);
|
|
}
|
|
} else {
|
|
error(1, "Bad filename extention \'%s\'", ext);
|
|
}
|
|
munmap(file, size);
|
|
}
|
|
|
|
void comp_file(const char *method, const char *from, const char *to) {
|
|
file_t type;
|
|
if (strcmp(method, "gzip") == 0) {
|
|
type = GZIP;
|
|
} else if (strcmp(method, "xz") == 0) {
|
|
type = XZ;
|
|
} else if (strcmp(method, "lzma") == 0) {
|
|
type = LZMA;
|
|
} else if (strcmp(method, "lz4") == 0) {
|
|
type = LZ4;
|
|
} else if (strcmp(method, "lz4_legacy") == 0) {
|
|
type = LZ4_LEGACY;
|
|
} else if (strcmp(method, "bzip2") == 0) {
|
|
type = BZIP2;
|
|
} else {
|
|
error(1, "Only support following methods: ");
|
|
}
|
|
unsigned char *file;
|
|
size_t size;
|
|
mmap_ro(from, &file, &size);
|
|
if (!to)
|
|
to = from;
|
|
comp(type, to, file, size);
|
|
munmap(file, size);
|
|
if (to == from)
|
|
unlink(from);
|
|
}
|
|
|