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XexUnpack.cpp
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XexUnpack.cpp
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#include <cstdarg>
#include <cstring>
#include "XexUnpack.h"
#include <iostream>
#include "mspack/lzx.h"
#include "mspack/mspack.h"
typedef struct _mem_buf {
void *data;
size_t length;
const char *name;
} mem_buf;
typedef struct _mem_file {
unsigned char *data;
size_t length;
size_t posn;
const char *name;
} mem_file;
static void *mem_alloc(struct mspack_system *self, size_t bytes) {
return malloc(bytes);
}
static void mem_free(void *buffer) {
free(buffer);
}
static void mem_copy(void *src, void *dest, size_t bytes) {
memcpy(dest, src, bytes);
}
static void mem_msg(mem_file *file, const char *format, ...) {
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
fputc((int) '\n', stderr);
fflush(stderr);
}
static mem_file *mem_open(struct mspack_system *self, mem_buf *fn, int mode) {
mem_file *fh;
if (fn == nullptr || fn->data == nullptr || fn->length == 0) {
return nullptr;
}
if ((fh = (mem_file *) mem_alloc(self, sizeof(mem_file)))) {
fh->data = (unsigned char *) fn->data;
fh->length = fn->length;
fh->posn = (mode == MSPACK_SYS_OPEN_APPEND) ? fn->length : 0;
fh->name = fn->name;
}
return fh;
}
static void mem_close(mem_file *fh) {
if (fh == nullptr) {
return;
}
mem_free(fh);
}
static int mem_read(mem_file *fh, void *buffer, int bytes) {
if (fh == nullptr || buffer == nullptr || bytes < 0) {
return -1;
}
int todo = fh->length - fh->posn;
if (todo > bytes) {
todo = bytes;
}
if (todo > 0) {
mem_copy(&fh->data[fh->posn], buffer, (size_t) todo);
}
fh->posn += todo;
return todo;
}
static int mem_write(mem_file *fh, void *buffer, int bytes) {
if (fh == nullptr || buffer == nullptr || bytes < 0) {
return -1;
}
int todo = fh->length - fh->posn;
if (todo > bytes) {
todo = bytes;
}
if (todo > 0) {
mem_copy(buffer, &fh->data[fh->posn], (size_t) todo);
}
fh->posn += todo;
return todo;
}
static int mem_seek(mem_file *fh, off_t offset, int mode) {
if (fh == nullptr) {
return 1;
}
switch (mode) {
case MSPACK_SYS_SEEK_START:
break;
case MSPACK_SYS_SEEK_CUR:
offset += (off_t) fh->posn;
break;
case MSPACK_SYS_SEEK_END:
offset = (off_t) fh->length;
break;
default:
return 1;
}
if ((offset < 0) || (offset > (off_t) fh->length)) {
return 1;
}
fh->posn = (size_t) offset;
return 0;
}
static off_t mem_tell(mem_file *fh) {
return (fh == nullptr) ? -1 : (off_t) fh->posn;
}
static struct mspack_system mem_system = {
(struct mspack_file *(*)(struct mspack_system *, const char *, int)) &mem_open,
(void (*)(struct mspack_file *)) &mem_close,
(int (*)(struct mspack_file *, void *, int)) &mem_read,
(int (*)(struct mspack_file *, void *, int)) &mem_write,
(int (*)(struct mspack_file *, off_t, int)) &mem_seek,
(off_t(*)(struct mspack_file *)) &mem_tell,
(void (*)(struct mspack_file *, const char *, ...)) &mem_msg,
&mem_alloc,
&mem_free,
&mem_copy,
nullptr
};
int getBitSize(uint32_t winSize) {
switch (winSize) {
case 0x8000:
return 15;
case 0x10000:
return 16;
case 0x20000:
return 17;
case 0x40000:
return 18;
case 0x80000:
return 19;
case 0x100000:
return 20;
case 0x200000:
return 21;
}
return 0;
}
uint16_t getBe16(void* inval) {
unsigned char *data = (unsigned char *) inval;
uint16_t result = (data[0] & 0xFF) << 8;
result |= (data[1] & 0xFF);
return result;
}
uint32_t getBe32(void* inval) {
unsigned char *data = (unsigned char *) inval;
uint32_t result = (data[0] & 0xFF) << 24;
result |= (data[1] & 0xFF) << 16;
result |= (data[2] & 0xFF) << 8;
result |= (data[3] & 0xFF);
return result;
}
bool unpack(uint8_t* inputData, uint32_t inputDataSize, uint8_t* outputData, uint32_t outputDataSize, uint32_t windowSize) {
bool result = false;
struct mspack_system *sys = &mem_system;
struct lzxd_stream *context = nullptr;
mem_buf source = {NULL, 0, "source"};
mem_buf output = {NULL, 0, "output"};
mem_file *in, *out;
source.data = inputData;
source.length = inputDataSize;
output.data = outputData;
output.length = outputDataSize;
in = (mem_file *) sys->open(sys, (const char *) &source, MSPACK_SYS_OPEN_READ);
out = (mem_file *) sys->open(sys, (const char *) &output, MSPACK_SYS_OPEN_WRITE);
context = lzxd_init(sys, (struct mspack_file *) in, (struct mspack_file *) out, getBitSize(windowSize), 0, windowSize, (off_t) outputDataSize, 0);
if (context != nullptr)
{
int stLzx = lzxd_decompress(context, (off_t) outputDataSize);
if (stLzx == MSPACK_ERR_OK)
{
result = true;
}
lzxd_free(context);
}
sys->close((struct mspack_file *) in);
sys->close((struct mspack_file *) out);
return result;
}
TR_EXPORT void LZXUnpack(uint8_t* inputData, uint32_t inputDataSize, uint8_t* outputData, uint32_t outputDataSize, uint32_t windowSize, uint32_t &error) {
bool result = unpack(inputData, inputDataSize, outputData, outputDataSize, windowSize);
error = result ? 0 : -1;
}