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Symbols for codes shorter than the prefix table index width are stored
in the table. All the entries in the table with an index starting with
the code are set to the symbol value. That way, when decoding it is
possible to get the number of bits corresponding to the table width from
the bitstream and directly find the symbol value. Longer code still need
to be searched for in the codes list.
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* Fixed peekBits not to seek the underlying stream. Seeking can be slow
when the stream is a file.
* Changed multi-bit operations to work on multiple bits at once rather
than iterating over single-bit operations.
This is an almost direct port of a patch for xoreos provided by DrMcCoy.
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If we want to properly test the computation is in double precision,
we should be using a much smaller error than the one used for the
single precision tests.
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Also add double template variants and use already defined delta
assert macro.
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Since the math is doing subtraction on numbers around 360 and single
precision has about ~7 decimal digits of accuracy we can only
compare numbers to 360.0001 to be safe i'll use 1e-3.
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I can't reproduce any precision issues on my machine so this
is only a guess.
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This should fix debian build.
Its seems the precision that debian is using is rounding the
error delta to zero so that the actual error is not less than
this.
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Instead of defining a new variable constant pi we use M_PI.
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I added tests for firstChar, setChar, insertChar
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matchString patterns couldn't be used to find files with the # character
as it was only treated as a digit wildcard. SCI expected that to work as
it looks for files that start with the # character.
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This was being patched out downstream in Debian. A solution that
works for everybody is to just not use a zero-length string when
testing formatting with no conversion specifications.
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Custom deleters of ScopedPtr are not currently fully conforming to
C++11's support for custom deleters in std::unique_ptr for the
sake of simplicity of implementation. Unlike in the standard
library, plain functions and lvalue references are not supported,
nor may custom deleters be passed to the constructor at runtime.
This can be improved in the future, if necessary, by doing what
standard library implementations usually do and creating a Pair
class that uses the Empty Base Optimization idiom to avoid extra
storage overhead of the deleter instance when it is not needed, as
in typical standard library implementations, plus some additional
type traits to support the necessary metaprogramming for the
different type overloads.
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Although the previous count-constructor would never make a copy of
a member at runtime, Array<T>::reserve *may* copy-construct, so
the compiler would forbid creation of arrays of NonCopyable objects
even when the array was created only once and then never resized
(and thus never actually tried to perform a copy-construction).
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This matches the C++11 std::vector method of the same name, and
replaces usage of taking the address of the first element of an
array by &array[0] or &array.front() or &*array.begin(). The data
method is better than these usages because it can be used even
when the array is empty.
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These are additions to match C++11 std::vector common init
patterns, to make Common::Array cover more common use cases where
C-style arrays are currently used (and should not be).
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To move data from one SpanOwner to another, use `moveFrom`.
Thanks @waltervn for pointing out the problem.
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Until C++11 (which introduces the z and t length modifiers), there
is no consistent way to print size_t and ptrdiff_t types using
printf formatting across 32-bit, LLP64, and LP64 architectures
without using a cumbersome macro to select the appropriate length
modifier for the target architecture. Since ScummVM engines
currently need to support 32-bit targets, there is no reason at
the moment to support any larger memory sizes in Span anyway.
Span error output is also updated in this commit to reflect that
index values are unsigned.
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The recent changes were made in attempt to fix the test building
for NDS target, but since we're not building tests there, these
changes are reverted for the sake of cleaner code.
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LIBS needs to go after LDFLAGS for the Dreamcast linker to run
correctly.
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Implicitly generated constructors can be used instead of explicit
constructors, which reduces the amount of necessary boilerplate.
Long lists of identical typedefs to the superclass are now defined
using a macro.
data() const now returns a pointer to data that matches the
value_type of the data, instead of forcing the data to be const.
This better matches the intent of the Span class, which provides
a view into data, rather than being a container that holds data.
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Span is roughly modelled on the GSL span<T> type, and is intended
to replace direct access to raw pointers -- especially pointers
that are passed to functions along with a separate size
parameter. It provides low-cost bounds-checked reads and writes,
as well as convenience functions for reading common values
(integers of varying endianness, strings, etc.). While similar to
MemoryReadStream in purpose, Span is superior in cases where
memory is writable, where memory is accessed randomly rather than
sequentially, or where any invalid access should be treated as an
unrecoverable error. It should also be more efficient than a
MemoryReadStream because it is implemented using CRTP, so there is
no runtime overhead from dynamic dispatch.
NamedSpan is an extension of Span which provides enhanced
debugging information when out-of-bounds memory accesses occur.
It allows programmers to name the memory span at construction time,
and it also tracks the offsets of subspans so that the absolute
byte offset of the original memory can be provided in the error
message if an out-of-bounds access occurs.
SpanOwner is similar to ScopedPtr but has awareness of the design
of Span objects, so allows the memory pointed to by the Span object
inside the SpanOwner to be freed when the SpanOwner is freed
without requiring holding a separate pointer to the start of
memory. It also provides some copy semantics, so unlike a ScopedPtr,
SpanOwners can be held by objects in movable containers like
Common::Array -- but note that because there are no move semantics
in C++98, this means that a new, complete memory copy of the
pointed-to data will be created, rather than just a new Span
pointing to the same block of memory, when a container holding a
SpanOwner expands.
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This API is intended for use in cases where C strings come
from untrusted sources like game files, where malformed data
missing the null terminator would cause strlen to read out of
bounds.
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WINTERMUTE: Fix PathUtils and add workaround for mixed separators
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I put scare quotes around "correctly" because I can't swear this is the
intended behaviour of the original interpreter.
I don't think accessing filenames that end with / in the .DCPs is even
defined behaviour, so this is a best guess.
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Fixes #6594
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This reverts commit 1f8667c5d949070035390531e4f10c0f945d7352.
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