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Make sure to always read into a properly aligned buffer

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Maschell 2022-02-13 13:07:08 +01:00
parent 1d023a1c17
commit 8b86de4565
1 changed files with 35 additions and 6 deletions
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39
source/romfs_dev.c
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@ -59,22 +59,51 @@ static romfs_file *romFS_file(romfs_mount *mount, uint32_t off) {
} }
static ssize_t _romfs_read(romfs_mount *mount, uint64_t offset, void *buffer, uint64_t size) { static ssize_t _romfs_read(romfs_mount *mount, uint64_t offset, void *buffer, uint64_t size) {
if (size == 0) {
return 0;
}
uint64_t pos = mount->offset + offset; uint64_t pos = mount->offset + offset;
size_t _read = 0;
if (mount->fd_type == RomfsSource_FileDescriptor) { if (mount->fd_type == RomfsSource_FileDescriptor) {
off_t seek_offset = lseek(mount->fd, pos, SEEK_SET); off_t seek_offset = lseek(mount->fd, pos, SEEK_SET);
if (pos != seek_offset) { if (pos != seek_offset) {
return -1; return -1;
} }
_read = read(mount->fd, buffer, size); return read(mount->fd, buffer, size);
} else if (mount->fd_type == RomfsSource_FileDescriptor_CafeOS) { } else if (mount->fd_type == RomfsSource_FileDescriptor_CafeOS) {
FSCmdBlock cmd; FSCmdBlock cmd;
FSInitCmdBlock(&cmd); FSInitCmdBlock(&cmd);
FSStatus result; FSStatus result = 0;
if ((((uint32_t) buffer) & 0x3F) == 0) { if ((((uint32_t) buffer) & 0x3F) == 0) {
// The buffer size needs to be a multiple of 0x40
if ((size & 0x3F) == 0) {
result = FSReadFileWithPos(&mount->cafe_client, &cmd, (uint8_t *) buffer, 1, size, pos, mount->cafe_fd, 0, FS_ERROR_FLAG_ALL); result = FSReadFileWithPos(&mount->cafe_client, &cmd, (uint8_t *) buffer, 1, size, pos, mount->cafe_fd, 0, FS_ERROR_FLAG_ALL);
} else { } else {
uint8_t *buffer_ = (uint8_t *) memalign(0x40, size); uint64_t readLen = size & ~(0x3F);
if (readLen > 0) {
result = FSReadFileWithPos(&mount->cafe_client, &cmd, (uint8_t *) buffer, 1, readLen, pos, mount->cafe_fd, 0, FS_ERROR_FLAG_ALL);
if (result < 0 || readLen != result) {
return -1;
}
offset += readLen;
}
uint8_t bufferStack[0x80];
uint64_t readRemaining = size - readLen;
uint8_t *alignedBuffer = (uint8_t *) (((uint32_t) bufferStack + 0x3F) & ~(0x3F));
FSStatus otherResult = FSReadFileWithPos(&mount->cafe_client, &cmd, alignedBuffer, 1, readRemaining, offset, mount->cafe_fd, 0, FS_ERROR_FLAG_ALL);
if (otherResult < 0 || otherResult != readRemaining) {
return -1;
}
memcpy(buffer + readLen, alignedBuffer, readRemaining);
result += (uint32_t) otherResult;
}
} else {
// The buffer needs to be aligned to 0x40
// The buffer size needs to be a multiple of 0x40
uint8_t *buffer_ = (uint8_t *) memalign(0x40, (size + 0x3F) & ~(0x3F));
if (!buffer_) { if (!buffer_) {
return -1; return -1;
} }
@ -88,7 +117,7 @@ static ssize_t _romfs_read(romfs_mount *mount, uint64_t offset, void *buffer, ui
} }
return result; return result;
} }
return _read; return -1;
} }
static bool _romfs_read_chk(romfs_mount *mount, uint64_t offset, void *buffer, uint64_t size) { static bool _romfs_read_chk(romfs_mount *mount, uint64_t offset, void *buffer, uint64_t size) {