538 lines
12 KiB
C++
538 lines
12 KiB
C++
#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <memory>
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#include <functional>
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#include <logging.h>
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#include <utils.h>
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#include "magiskboot.h"
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#include "compress.h"
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using namespace std;
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static bool read_file(FILE *fp, const function<void (void *, size_t)> &fn) {
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char buf[4096];
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size_t len;
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while ((len = fread(buf, 1, sizeof(buf), fp)))
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fn(buf, len);
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return true;
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}
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void decompress(char *infile, const char *outfile) {
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bool in_std = strcmp(infile, "-") == 0;
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bool rm_in = false;
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FILE *in_file = in_std ? stdin : xfopen(infile, "re");
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int out_fd = -1;
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unique_ptr<Compression> cmp;
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read_file(in_file, [&](void *buf, size_t len) -> void {
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if (out_fd < 0) {
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format_t type = check_fmt(buf, len);
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fprintf(stderr, "Detected format: [%s]\n", fmt2name[type]);
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if (!COMPRESSED(type))
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LOGE("Input file is not a supported compressed type!\n");
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cmp.reset(get_decoder(type));
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/* If user does not provide outfile, infile has to be either
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* <path>.[ext], or '-'. Outfile will be either <path> or '-'.
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* If the input does not have proper format, abort */
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char *ext = nullptr;
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if (outfile == nullptr) {
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outfile = infile;
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if (!in_std) {
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ext = strrchr(infile, '.');
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if (ext == nullptr || strcmp(ext, fmt2ext[type]) != 0)
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LOGE("Input file is not a supported type!\n");
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// Strip out extension and remove input
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*ext = '\0';
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rm_in = true;
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fprintf(stderr, "Decompressing to [%s]\n", outfile);
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}
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}
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out_fd = strcmp(outfile, "-") == 0 ?
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STDOUT_FILENO : xopen(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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cmp->setOut(make_unique<FDOutStream>(out_fd));
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if (ext) *ext = '.';
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}
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if (!cmp->write(buf, len))
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LOGE("Decompression error!\n");
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});
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cmp->finalize();
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fclose(in_file);
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close(out_fd);
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if (rm_in)
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unlink(infile);
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}
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void compress(const char *method, const char *infile, const char *outfile) {
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auto it = name2fmt.find(method);
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if (it == name2fmt.end())
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LOGE("Unsupported compression method: [%s]\n", method);
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unique_ptr<Compression> cmp(get_encoder(it->second));
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bool in_std = strcmp(infile, "-") == 0;
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bool rm_in = false;
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FILE *in_file = in_std ? stdin : xfopen(infile, "re");
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int out_fd;
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if (outfile == nullptr) {
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if (in_std) {
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out_fd = STDOUT_FILENO;
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} else {
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/* If user does not provide outfile and infile is not
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* STDIN, output to <infile>.[ext] */
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char *tmp = new char[strlen(infile) + 5];
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sprintf(tmp, "%s%s", infile, fmt2ext[it->second]);
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out_fd = xopen(tmp, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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fprintf(stderr, "Compressing to [%s]\n", tmp);
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delete[] tmp;
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rm_in = true;
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}
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} else {
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out_fd = strcmp(outfile, "-") == 0 ?
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STDOUT_FILENO : xopen(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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}
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cmp->setOut(make_unique<FDOutStream>(out_fd));
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read_file(in_file, [&](void *buf, size_t len) -> void {
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if (!cmp->write(buf, len))
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LOGE("Compression error!\n");
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});
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cmp->finalize();
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fclose(in_file);
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close(out_fd);
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if (rm_in)
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unlink(infile);
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}
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Compression *get_encoder(format_t type) {
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switch (type) {
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case XZ:
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return new XZEncoder();
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case LZMA:
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return new LZMAEncoder();
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case BZIP2:
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return new BZEncoder();
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case LZ4:
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return new LZ4FEncoder();
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case LZ4_LEGACY:
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return new LZ4Encoder();
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case GZIP:
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default:
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return new GZEncoder();
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}
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}
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Compression *get_decoder(format_t type) {
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switch (type) {
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case XZ:
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case LZMA:
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return new LZMADecoder();
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case BZIP2:
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return new BZDecoder();
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case LZ4:
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return new LZ4FDecoder();
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case LZ4_LEGACY:
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return new LZ4Decoder();
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case GZIP:
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default:
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return new GZDecoder();
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}
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}
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GZStream::GZStream(int mode) : mode(mode), strm({}) {
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switch(mode) {
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case 0:
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inflateInit2(&strm, 15 | 16);
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break;
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case 1:
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deflateInit2(&strm, 9, Z_DEFLATED, 15 | 16, 8, Z_DEFAULT_STRATEGY);
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break;
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}
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}
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bool GZStream::write(const void *in, size_t size) {
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return size ? write(in, size, Z_NO_FLUSH) : true;
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}
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uint64_t GZStream::finalize() {
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write(nullptr, 0, Z_FINISH);
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uint64_t total = strm.total_out;
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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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return total;
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}
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bool GZStream::write(const void *in, size_t size, int flush) {
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int ret;
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strm.next_in = (Bytef *) in;
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strm.avail_in = size;
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do {
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strm.next_out = outbuf;
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strm.avail_out = sizeof(outbuf);
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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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LOGW("Gzip %s failed (%d)\n", mode ? "encode" : "decode", ret);
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return false;
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}
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FilterOutStream::write(outbuf, sizeof(outbuf) - strm.avail_out);
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} while (strm.avail_out == 0);
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return true;
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}
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BZStream::BZStream(int mode) : mode(mode), strm({}) {
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switch(mode) {
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case 0:
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BZ2_bzDecompressInit(&strm, 0, 0);
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break;
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case 1:
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BZ2_bzCompressInit(&strm, 9, 0, 0);
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break;
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}
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}
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bool BZStream::write(const void *in, size_t size) {
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return size ? write(in, size, BZ_RUN) : true;
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}
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uint64_t BZStream::finalize() {
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if (mode)
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write(nullptr, 0, BZ_FINISH);
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uint64_t total = ((uint64_t) strm.total_out_hi32 << 32) + strm.total_out_lo32;
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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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return total;
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}
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bool BZStream::write(const void *in, size_t size, int flush) {
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int ret;
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strm.next_in = (char *) in;
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strm.avail_in = size;
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do {
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strm.avail_out = sizeof(outbuf);
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strm.next_out = outbuf;
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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, flush);
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break;
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}
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if (ret < 0) {
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LOGW("Bzip2 %s failed (%d)\n", mode ? "encode" : "decode", ret);
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return false;
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}
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FilterOutStream::write(outbuf, sizeof(outbuf) - strm.avail_out);
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} while (strm.avail_out == 0);
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return true;
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}
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LZMAStream::LZMAStream(int mode) : mode(mode), strm(LZMA_STREAM_INIT) {
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lzma_options_lzma opt;
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int ret;
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// Initialize preset
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lzma_lzma_preset(&opt, 9);
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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 = nullptr },
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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_CRC32);
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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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}
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}
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bool LZMAStream::write(const void *in, size_t size) {
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return size ? write(in, size, LZMA_RUN) : true;
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}
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uint64_t LZMAStream::finalize() {
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write(nullptr, 0, LZMA_FINISH);
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uint64_t total = strm.total_out;
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lzma_end(&strm);
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return total;
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}
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bool LZMAStream::write(const void *in, size_t size, lzma_action flush) {
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int ret;
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strm.next_in = (uint8_t *) in;
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strm.avail_in = size;
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do {
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strm.avail_out = sizeof(outbuf);
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strm.next_out = outbuf;
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ret = lzma_code(&strm, flush);
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if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
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LOGW("LZMA %s failed (%d)\n", mode ? "encode" : "decode", ret);
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return false;
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}
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FilterOutStream::write(outbuf, sizeof(outbuf) - strm.avail_out);
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} while (strm.avail_out == 0);
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return true;
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}
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LZ4FDecoder::LZ4FDecoder() : outbuf(nullptr), total(0) {
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LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION);
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}
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LZ4FDecoder::~LZ4FDecoder() {
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LZ4F_freeDecompressionContext(ctx);
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delete[] outbuf;
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}
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bool LZ4FDecoder::write(const void *in, size_t size) {
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auto inbuf = (const uint8_t *) in;
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if (!outbuf)
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read_header(inbuf, size);
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size_t read, write;
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LZ4F_errorCode_t ret;
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do {
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read = size;
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write = outCapacity;
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ret = LZ4F_decompress(ctx, outbuf, &write, inbuf, &read, nullptr);
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if (LZ4F_isError(ret)) {
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LOGW("LZ4 decode error: %s\n", LZ4F_getErrorName(ret));
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return false;
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}
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size -= read;
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inbuf += read;
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total += write;
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FilterOutStream::write(outbuf, write);
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} while (size != 0 || write != 0);
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return true;
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}
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uint64_t LZ4FDecoder::finalize() {
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return total;
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}
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void LZ4FDecoder::read_header(const uint8_t *&in, size_t &size) {
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size_t read = size;
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LZ4F_frameInfo_t info;
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LZ4F_getFrameInfo(ctx, &info, in, &read);
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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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}
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outbuf = new uint8_t[outCapacity];
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in += read;
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size -= read;
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}
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LZ4FEncoder::LZ4FEncoder() : outbuf(nullptr), outCapacity(0), total(0) {
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LZ4F_createCompressionContext(&ctx, LZ4F_VERSION);
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}
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LZ4FEncoder::~LZ4FEncoder() {
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LZ4F_freeCompressionContext(ctx);
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delete[] outbuf;
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}
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bool LZ4FEncoder::write(const void *in, size_t size) {
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if (!outbuf)
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write_header();
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if (size == 0)
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return true;
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auto inbuf = (const uint8_t *) in;
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size_t read, write;
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do {
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read = size > BLOCK_SZ ? BLOCK_SZ : size;
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write = LZ4F_compressUpdate(ctx, outbuf, outCapacity, inbuf, read, nullptr);
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if (LZ4F_isError(write)) {
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LOGW("LZ4 encode error: %s\n", LZ4F_getErrorName(write));
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return false;
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}
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size -= read;
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inbuf += read;
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total += write;
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FilterOutStream::write(outbuf, write);
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} while (size != 0);
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return true;
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}
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uint64_t LZ4FEncoder::finalize() {
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size_t write = LZ4F_compressEnd(ctx, outbuf, outCapacity, nullptr);
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total += write;
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FilterOutStream::write(outbuf, write);
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return total;
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}
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void LZ4FEncoder::write_header() {
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LZ4F_preferences_t prefs {
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.autoFlush = 1,
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.compressionLevel = 9,
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.frameInfo = {
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.blockMode = LZ4F_blockIndependent,
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.blockSizeID = LZ4F_max4MB,
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.blockChecksumFlag = LZ4F_noBlockChecksum,
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.contentChecksumFlag = LZ4F_contentChecksumEnabled
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}
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};
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outCapacity = LZ4F_compressBound(BLOCK_SZ, &prefs);
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outbuf = new uint8_t[outCapacity];
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size_t write = LZ4F_compressBegin(ctx, outbuf, outCapacity, &prefs);
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total += write;
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FilterOutStream::write(outbuf, write);
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}
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LZ4Decoder::LZ4Decoder() : outbuf(new char[LZ4_UNCOMPRESSED]), buf(new char[LZ4_COMPRESSED]),
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init(false), block_sz(0), buf_off(0), total(0) {}
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LZ4Decoder::~LZ4Decoder() {
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delete[] outbuf;
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delete[] buf;
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}
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bool LZ4Decoder::write(const void *in, size_t size) {
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const char *inbuf = (const char *) in;
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if (!init) {
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// Skip magic
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inbuf += 4;
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size -= 4;
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init = true;
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}
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int write;
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size_t consumed;
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do {
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if (block_sz == 0) {
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block_sz = *((unsigned *) inbuf);
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inbuf += sizeof(unsigned);
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size -= sizeof(unsigned);
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} else if (buf_off + size >= block_sz) {
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consumed = block_sz - buf_off;
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memcpy(buf + buf_off, inbuf, consumed);
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inbuf += consumed;
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size -= consumed;
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write = LZ4_decompress_safe(buf, outbuf, block_sz, LZ4_UNCOMPRESSED);
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if (write < 0) {
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LOGW("LZ4HC decompression failure (%d)\n", write);
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return false;
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}
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FilterOutStream::write(outbuf, write);
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total += write;
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// Reset
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buf_off = 0;
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block_sz = 0;
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} else {
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// Copy to internal buffer
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memcpy(buf + buf_off, inbuf, size);
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buf_off += size;
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size = 0;
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}
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} while (size != 0);
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return true;
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}
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uint64_t LZ4Decoder::finalize() {
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return total;
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}
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LZ4Encoder::LZ4Encoder() : outbuf(new char[LZ4_COMPRESSED]), buf(new char[LZ4_UNCOMPRESSED]),
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init(false), buf_off(0), out_total(0), in_total(0) {}
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LZ4Encoder::~LZ4Encoder() {
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delete[] outbuf;
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delete[] buf;
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}
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bool LZ4Encoder::write(const void *in, size_t size) {
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if (!init) {
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FilterOutStream::write("\x02\x21\x4c\x18", 4);
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init = true;
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}
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if (size == 0)
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return true;
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in_total += size;
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const char *inbuf = (const char *) in;
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size_t consumed;
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int write;
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do {
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if (buf_off + size >= LZ4_UNCOMPRESSED) {
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consumed = LZ4_UNCOMPRESSED - buf_off;
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memcpy(buf + buf_off, inbuf, consumed);
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inbuf += consumed;
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size -= consumed;
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write = LZ4_compress_HC(buf, outbuf, LZ4_UNCOMPRESSED, LZ4_COMPRESSED, 9);
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if (write == 0) {
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LOGW("LZ4HC compression failure\n");
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return false;
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}
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FilterOutStream::write(&write, sizeof(write));
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FilterOutStream::write(outbuf, write);
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out_total += write + sizeof(write);
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// Reset buffer
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buf_off = 0;
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} else {
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// Copy to internal buffer
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memcpy(buf + buf_off, inbuf, size);
|
|
buf_off += size;
|
|
size = 0;
|
|
}
|
|
} while (size != 0);
|
|
return true;
|
|
}
|
|
|
|
uint64_t LZ4Encoder::finalize() {
|
|
if (buf_off) {
|
|
int write = LZ4_compress_HC(buf, outbuf, buf_off, LZ4_COMPRESSED, 9);
|
|
FilterOutStream::write(&write, sizeof(write));
|
|
FilterOutStream::write(outbuf, write);
|
|
out_total += write + sizeof(write);
|
|
}
|
|
FilterOutStream::write(&in_total, sizeof(in_total));
|
|
return out_total + sizeof(in_total);
|
|
}
|