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ro/util: last round of fixes, now fully matches official behavior

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This commit is contained in:
hexkyz
2026-09-27 22:09:31 +01:00
parent afb0cda7f3
commit a1a9886290
2 changed files with 51 additions and 45 deletions
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88
libraries/libstratosphere/source/util/util_compression_lz4.cpp
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@@ -45,19 +45,24 @@ namespace ams::util {
/* Destination buffer must be behind source buffer. */
if (dst_buffer > src_buffer) {
std::memset(dst, 0, dst_size);
std::memset(dst_buffer, 0, dst_size);
return -1;
}
const u8 *src_buffer_start = src_buffer;
const u8 *src_buffer_end = src_buffer + src_size;
const u8 *dst_buffer_start = dst_buffer;
const u8 *dst_buffer_end = dst_buffer + dst_size;
/* Size checks. */
if (((src_buffer + src_size) != (dst_buffer + dst_size)) || (src_work_size != 0x10000) || (dst_work_size != 0x10000)) {
std::memset(dst, 0, dst_size);
if ((src_buffer_end != dst_buffer_end) || (src_work_size != 0x10000) || (dst_work_size != 0x10000)) {
std::memset(dst_buffer, 0, dst_size);
return -1;
}
/* Source size must at least include one frame header. */
if (src_size < 7) {
std::memset(dst, 0, dst_size);
std::memset(dst_buffer, 0, dst_size);
return -2;
}
@@ -68,34 +73,34 @@ namespace ams::util {
/* Check for LZ4F_MAGICNUMBER, validate flags and block size. */
if ((magic != 0x184D2204) || ((flg & 1) != 0) || (flg != 0x60) || (bd != 0x40)) {
std::memset(dst, 0, dst_size);
std::memset(dst_buffer, 0, dst_size);
return -2;
}
/* TODO: Implement header checksum validation. This requires xxhash, do we want to have xxhash in util? */
AMS_UNUSED(header_checksum);
u32 src_pos = 7; /* Skip the header. */
u32 dst_pos = 0;
/* Skip the frame header. */
src_buffer += 7;
/* Destination size is too small. */
if (dst_size < src_pos) {
std::memset(dst, 0, dst_size);
/* Destination is too small. */
if (src_buffer >= dst_buffer_end) {
std::memset(dst_buffer, 0, dst_size);
return -2;
}
while (true) {
/* Not enough space left. */
if ((dst_size - src_pos) < 4) {
std::memset(dst, 0, dst_size);
if ((dst_buffer_end - src_buffer) < 4) {
std::memset(dst_buffer, 0, dst_size);
return -4;
}
src_buffer += src_pos;
dst_buffer += dst_pos;
const u32 block_header = *reinterpret_cast<const u32 *>(src_buffer);
/* Advance the block. */
src_buffer += sizeof(block_header);
/* We've reached the end. */
if (!block_header) {
break;
@@ -105,16 +110,13 @@ namespace ams::util {
/* Block size is invalid. */
if (block_size > 0x10000) {
std::memset(dst, 0, dst_size);
std::memset(dst_buffer, 0, dst_size);
return -3;
}
/* Advance the data block. */
src_buffer += sizeof(block_header);
/* Block size is invalid. */
if (((dst_buffer + dst_size) - src_buffer) < block_size) {
std::memset(dst, 0, dst_size);
if ((dst_buffer_end - src_buffer) < block_size) {
std::memset(dst_buffer, 0, dst_size);
return -4;
}
@@ -123,65 +125,67 @@ namespace ams::util {
if ((block_header & 0x80000000) != 0) {
/* Block size is invalid. */
if (dst_size < block_size) {
std::memset(dst, 0, dst_size);
if ((dst_buffer_end - dst_buffer) < block_size) {
std::memset(dst_buffer, 0, dst_size);
return -4;
}
dst_pos += block_size;
src_pos += block_size;
/* Destination is overrunning source. */
if (dst_pos > src_pos) {
std::memset(dst, 0, dst_size);
if ((dst_buffer + block_size) > (src_buffer + block_size)) {
std::memset(dst_buffer, 0, dst_size);
return -5;
}
/* This is a raw block, copy it. */
std::memmove(dst_buffer, src_buffer, block_size);
std::memmove(dst_buffer, src_buffer, block_size);
/* Advance buffers. */
dst_buffer += block_size;
src_buffer += block_size;
} else {
/* This is a compressed block, decompress it. */
int decompressed_size = LZ4_decompress_safe(reinterpret_cast<const char *>(src_work), reinterpret_cast<char *>(dst_work), static_cast<int>(block_size), 0x10000);
/* Decompressed size is invalid. */
if (decompressed_size < 1) {
std::memset(dst, 0, dst_size);
std::memset(dst_buffer, 0, dst_size);
return -3;
}
/* Decompressed size is invalid. */
if (dst_size < static_cast<size_t>(decompressed_size)) {
std::memset(dst, 0, dst_size);
if (static_cast<size_t>(dst_buffer_end - dst_buffer) < static_cast<size_t>(decompressed_size)) {
std::memset(dst_buffer, 0, dst_size);
return -4;
}
dst_pos += decompressed_size;
src_pos += block_size;
/* Destination is overrunning source. */
if (dst_pos > src_pos) {
std::memset(dst, 0, dst_size);
if ((dst_buffer + decompressed_size) > (src_buffer + block_size)) {
std::memset(dst_buffer, 0, dst_size);
return -5;
}
/* Copy the decompressed data back. */
std::memcpy(dst_buffer, static_cast<u8 *>(dst_work), decompressed_size);
/* Advance buffers. */
dst_buffer += decompressed_size;
src_buffer += block_size;
}
/* We've exceeded the destination's size. */
if (src_pos >= dst_size) {
std::memset(dst, 0, dst_size);
if (src_buffer >= dst_buffer_end) {
std::memset(dst_buffer, 0, dst_size);
return -2;
}
}
/* We didn't consume all data. */
if (src_pos != src_size) {
std::memset(dst, 0, dst_size);
if (static_cast<size_t>(src_buffer - src_buffer_start) != src_size) {
std::memset(dst_buffer, 0, dst_size);
return -2;
}
*out_size = dst_pos;
*out_size = dst_buffer - dst_buffer_start;
return 0;
}
}