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Merge pull request #3597 from lioncash/lzss

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ncch_container: Get rid of pointer casts in LZSS_GetDecompressedSize() and LZSS_Decompress()
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Weiyi Wang 2018-03-29 09:42:25 +03:00 committed by GitHub
commit da91fb41db
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1 changed files with 6 additions and 2 deletions
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8
src/core/file_sys/ncch_container.cpp
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@ -26,7 +26,8 @@ static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
* @return Size of decompressed buffer * @return Size of decompressed buffer
*/ */
static u32 LZSS_GetDecompressedSize(const u8* buffer, u32 size) { static u32 LZSS_GetDecompressedSize(const u8* buffer, u32 size) {
u32 offset_size = *(u32*)(buffer + size - 4); u32 offset_size;
std::memcpy(&offset_size, buffer + size - sizeof(u32), sizeof(u32));
return offset_size + size; return offset_size + size;
} }
@ -41,7 +42,10 @@ static u32 LZSS_GetDecompressedSize(const u8* buffer, u32 size) {
static bool LZSS_Decompress(const u8* compressed, u32 compressed_size, u8* decompressed, static bool LZSS_Decompress(const u8* compressed, u32 compressed_size, u8* decompressed,
u32 decompressed_size) { u32 decompressed_size) {
const u8* footer = compressed + compressed_size - 8; const u8* footer = compressed + compressed_size - 8;
u32 buffer_top_and_bottom = *reinterpret_cast<const u32*>(footer);
u32 buffer_top_and_bottom;
std::memcpy(&buffer_top_and_bottom, footer, sizeof(u32));
u32 out = decompressed_size; u32 out = decompressed_size;
u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF); u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF);
u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF); u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF);