| #include <stdio.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "../common.h" |
| #include "C/LzmaDec.h" |
| #include "C/LzmaEnc.h" |
| |
| #define L (uint64_t) |
| |
| static inline uint64_t get_64(const void *p) |
| { |
| const unsigned char *data = (const unsigned char *)p; |
| return (L data[0]) | (L data[1] << 8) | (L data[2] << 16) | |
| (L data[3] << 24) | (L data [4] << 32) | (L data[5] << 40) | |
| (L data[6] << 48) | (L data[7] << 56); |
| } |
| |
| static void put_64(void *p, uint64_t value) |
| { |
| unsigned char *data = (unsigned char *)p; |
| data[0] = value & 0xff; |
| data[1] = (value >> 8) & 0xff; |
| data[2] = (value >> 16) & 0xff; |
| data[3] = (value >> 24) & 0xff; |
| data[4] = (value >> 32) & 0xff; |
| data[5] = (value >> 40) & 0xff; |
| data[6] = (value >> 48) & 0xff; |
| data[7] = (value >> 56) & 0xff; |
| } |
| |
| /* Memory Allocation API */ |
| |
| static void *SzAlloc(void *unused, size_t size) |
| { |
| return malloc(size); |
| } |
| |
| static void SzFree(void *unused, void *address) |
| { |
| free(address); |
| } |
| |
| static struct ISzAlloc LZMAalloc = { SzAlloc, SzFree }; |
| |
| /* Streaming API */ |
| |
| struct vector_t { |
| char *p; |
| size_t pos; |
| size_t size; |
| }; |
| |
| static struct vector_t instream, outstream; |
| |
| static SRes Read(void *unused, void *buf, size_t *size) |
| { |
| if ((instream.size - instream.pos) < *size) |
| *size = instream.size - instream.pos; |
| memcpy(buf, instream.p + instream.pos, *size); |
| instream.pos += *size; |
| return SZ_OK; |
| } |
| |
| static size_t Write(void *unused, const void *buf, size_t size) |
| { |
| if(outstream.size - outstream.pos < size) |
| size = outstream.size - outstream.pos; |
| memcpy(outstream.p + outstream.pos, buf, size); |
| outstream.pos += size; |
| return size; |
| } |
| |
| static struct ISeqInStream is = { Read }; |
| static struct ISeqOutStream os = { Write }; |
| |
| /** |
| * Compress a buffer with lzma |
| * Don't copy the result back if it is too large. |
| * @param in a pointer to the buffer |
| * @param in_len the length in bytes |
| * @param out a pointer to a buffer of at least size in_len |
| * @param out_len a pointer to the compressed length of in |
| */ |
| |
| void do_lzma_compress(char *in, int in_len, char *out, int *out_len) |
| { |
| if (in_len == 0) { |
| ERROR("LZMA: Input length is zero.\n"); |
| return; |
| } |
| |
| struct CLzmaEncProps props; |
| LzmaEncProps_Init(&props); |
| props.dictSize = in_len; |
| props.pb = 0; /* PosStateBits, default: 2, range: 0..4 */ |
| props.lp = 0; /* LiteralPosStateBits, default: 0, range: 0..4 */ |
| props.lc = 1; /* LiteralContextBits, default: 3, range: 0..8 */ |
| props.fb = 273; /* NumFastBytes */ |
| props.mc = 0; /* MatchFinderCycles, default: 0 */ |
| props.algo = 1; /* AlgorithmNo, apparently, 0 and 1 are valid values. 0 = fast mode */ |
| props.numThreads = 1; |
| |
| switch (props.algo) { |
| case 0: // quick: HC4 |
| props.btMode = 0; |
| props.level = 1; |
| break; |
| case 1: // full: BT4 |
| default: |
| props.level = 9; |
| props.btMode = 1; |
| props.numHashBytes = 4; |
| break; |
| } |
| |
| CLzmaEncHandle p = LzmaEnc_Create(&LZMAalloc); |
| |
| int res = LzmaEnc_SetProps(p, &props); |
| if (res != SZ_OK) { |
| ERROR("LZMA: LzmaEnc_SetProps failed.\n"); |
| return; |
| } |
| |
| unsigned char propsEncoded[LZMA_PROPS_SIZE + 8]; |
| size_t propsSize = sizeof propsEncoded; |
| res = LzmaEnc_WriteProperties(p, propsEncoded, &propsSize); |
| if (res != SZ_OK) { |
| ERROR("LZMA: LzmaEnc_WriteProperties failed.\n"); |
| return; |
| } |
| |
| instream.p = in; |
| instream.pos = 0; |
| instream.size = in_len; |
| |
| outstream.p = out; |
| outstream.pos = 0; |
| outstream.size = in_len; |
| |
| put_64(propsEncoded + LZMA_PROPS_SIZE, in_len); |
| Write(&os, propsEncoded, LZMA_PROPS_SIZE+8); |
| |
| res = LzmaEnc_Encode(p, &os, &is, 0, &LZMAalloc, &LZMAalloc); |
| if (res != SZ_OK) { |
| ERROR("LZMA: LzmaEnc_Encode failed %d.\n", res); |
| return; |
| } |
| |
| *out_len = outstream.pos; |
| } |
| |
| void do_lzma_uncompress(char *dst, int dst_len, char *src, int src_len) |
| { |
| if (src_len <= LZMA_PROPS_SIZE + 8) { |
| ERROR("LZMA: Input length is too small.\n"); |
| return; |
| } |
| |
| uint64_t out_sizemax = get_64(&src[LZMA_PROPS_SIZE]); |
| |
| if (out_sizemax > (size_t) dst_len) { |
| ERROR("Not copying %d bytes to %d-byte buffer!\n", |
| (unsigned int)out_sizemax, dst_len); |
| return; |
| } |
| |
| enum ELzmaStatus status; |
| |
| size_t destlen = out_sizemax; |
| size_t srclen = src_len - (LZMA_PROPS_SIZE + 8); |
| |
| int res = LzmaDecode((uint8_t *) dst, &destlen, |
| (uint8_t *) &src[LZMA_PROPS_SIZE + 8], &srclen, |
| (uint8_t *) &src[0], LZMA_PROPS_SIZE, |
| LZMA_FINISH_END, |
| &status, |
| &LZMAalloc); |
| |
| if (res != SZ_OK) { |
| ERROR("Error while decompressing.\n"); |
| return; |
| } |
| } |