From 29665ae79c862a1bc0818f625b59384273a9dac4 Mon Sep 17 00:00:00 2001
From: gibbed <rick@gibbed.us>
Date: Wed, 17 Jul 2019 17:51:36 -0500
Subject: [PATCH] [CPU] Minor LZX code cleanup.

---
 src/xenia/cpu/lzx.cc | 55 +++++++++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 26 deletions(-)

diff --git a/src/xenia/cpu/lzx.cc b/src/xenia/cpu/lzx.cc
index ced471221..992daca43 100644
--- a/src/xenia/cpu/lzx.cc
+++ b/src/xenia/cpu/lzx.cc
@@ -22,19 +22,20 @@
 #include "third_party/mspack/mspack.h"
 
 typedef struct mspack_memory_file_t {
-  struct mspack_system sys;
+  mspack_system sys;
   void* buffer;
   off_t buffer_size;
   off_t offset;
 } mspack_memory_file;
-mspack_memory_file* mspack_memory_open(struct mspack_system* sys, void* buffer,
+
+mspack_memory_file* mspack_memory_open(mspack_system* sys, void* buffer,
                                        const size_t buffer_size) {
   assert_true(buffer_size < INT_MAX);
   if (buffer_size >= INT_MAX) {
     return NULL;
   }
-  mspack_memory_file* memfile =
-      (mspack_memory_file*)calloc(1, sizeof(mspack_memory_file));
+  auto memfile =
+      (mspack_memory_file*)std::calloc(1, sizeof(mspack_memory_file));
   if (!memfile) {
     return NULL;
   }
@@ -43,36 +44,42 @@ mspack_memory_file* mspack_memory_open(struct mspack_system* sys, void* buffer,
   memfile->offset = 0;
   return memfile;
 }
+
 void mspack_memory_close(mspack_memory_file* file) {
-  mspack_memory_file* memfile = (mspack_memory_file*)file;
-  free(memfile);
+  auto memfile = (mspack_memory_file*)file;
+  std::free(memfile);
 }
-int mspack_memory_read(struct mspack_file* file, void* buffer, int chars) {
-  mspack_memory_file* memfile = (mspack_memory_file*)file;
+
+int mspack_memory_read(mspack_file* file, void* buffer, int chars) {
+  auto memfile = (mspack_memory_file*)file;
   const off_t remaining = memfile->buffer_size - memfile->offset;
   const off_t total = std::min(static_cast<off_t>(chars), remaining);
   std::memcpy(buffer, (uint8_t*)memfile->buffer + memfile->offset, total);
   memfile->offset += total;
   return (int)total;
 }
-int mspack_memory_write(struct mspack_file* file, void* buffer, int chars) {
-  mspack_memory_file* memfile = (mspack_memory_file*)file;
+
+int mspack_memory_write(mspack_file* file, void* buffer, int chars) {
+  auto memfile = (mspack_memory_file*)file;
   const off_t remaining = memfile->buffer_size - memfile->offset;
   const off_t total = std::min(static_cast<off_t>(chars), remaining);
   std::memcpy((uint8_t*)memfile->buffer + memfile->offset, buffer, total);
   memfile->offset += total;
   return (int)total;
 }
-void* mspack_memory_alloc(struct mspack_system* sys, size_t chars) {
+
+void* mspack_memory_alloc(mspack_system* sys, size_t chars) {
   return std::calloc(chars, 1);
 }
-void mspack_memory_free(void* ptr) { free(ptr); }
+
+void mspack_memory_free(void* ptr) { std::free(ptr); }
+
 void mspack_memory_copy(void* src, void* dest, size_t chars) {
   std::memcpy(dest, src, chars);
 }
-struct mspack_system* mspack_memory_sys_create() {
-  struct mspack_system* sys =
-      (struct mspack_system*)std::calloc(1, sizeof(struct mspack_system));
+
+mspack_system* mspack_memory_sys_create() {
+  auto sys = (mspack_system*)std::calloc(1, sizeof(mspack_system));
   if (!sys) {
     return NULL;
   }
@@ -83,19 +90,13 @@ struct mspack_system* mspack_memory_sys_create() {
   sys->copy = mspack_memory_copy;
   return sys;
 }
+
 void mspack_memory_sys_destroy(struct mspack_system* sys) { free(sys); }
 
 int lzx_decompress(const void* lzx_data, size_t lzx_len, void* dest,
                    size_t dest_len, uint32_t window_size, void* window_data,
                    size_t window_data_len) {
-  uint32_t window_bits = 0;
-  uint32_t temp_sz = window_size;
-  for (size_t m = 0; m < 32; m++, window_bits++) {
-    temp_sz >>= 1;
-    if (temp_sz == 0x00000000) {
-      break;
-    }
-  }
+  uint32_t window_bits = xe::bit_count(window_size);
 
   int result_code = 1;
 
@@ -103,9 +104,8 @@ int lzx_decompress(const void* lzx_data, size_t lzx_len, void* dest,
   mspack_memory_file* lzxsrc =
       mspack_memory_open(sys, (void*)lzx_data, lzx_len);
   mspack_memory_file* lzxdst = mspack_memory_open(sys, dest, dest_len);
-  lzxd_stream* lzxd =
-      lzxd_init(sys, (struct mspack_file*)lzxsrc, (struct mspack_file*)lzxdst,
-                window_bits, 0, 0x8000, (off_t)dest_len, 0);
+  lzxd_stream* lzxd = lzxd_init(sys, (mspack_file*)lzxsrc, (mspack_file*)lzxdst,
+                                window_bits, 0, 0x8000, (off_t)dest_len, 0);
 
   if (lzxd) {
     if (window_data) {
@@ -121,14 +121,17 @@ int lzx_decompress(const void* lzx_data, size_t lzx_len, void* dest,
     lzxd_free(lzxd);
     lzxd = NULL;
   }
+
   if (lzxsrc) {
     mspack_memory_close(lzxsrc);
     lzxsrc = NULL;
   }
+
   if (lzxdst) {
     mspack_memory_close(lzxdst);
     lzxdst = NULL;
   }
+
   if (sys) {
     mspack_memory_sys_destroy(sys);
     sys = NULL;