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#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(unused void *u, size_t size)
{
return malloc(size);
}
static void SzFree(unused void *u, 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(unused void *u, 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(unused void *u, 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
*/
int 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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
*out_len = outstream.pos;
return 0;
}
int 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 -1;
}
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 -1;
}
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 -1;
}
return 0;
}
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