mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 10:35:26 +00:00
344 lines
7.3 KiB
C
344 lines
7.3 KiB
C
#include <zlib.h>
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#include <lzma.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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static int open_new(const char *filename) {
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int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if (fd < 0)
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error(1, "Unable to create %s", filename);
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return fd;
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}
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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", filename);
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break;
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default:
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printf("Compressing to %s\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, 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, 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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}
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// Mode: 0 = decode; 1 = encode
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void lz4(int mode, const char* filename, 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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}
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// Mode: 0 = decode; 1 = encode
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void bzip2(int mode, const char* filename, 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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