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COMMON: Add in-memory decompressor for powerpack

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This commit is contained in:
Vladimir Serbinenko 2022-12-03 07:49:43 +01:00 committed by Filippos Karapetis
parent ef7a3059e1
commit 2db745b62b
2 changed files with 26 additions and 4 deletions
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24
common/compression/powerpacker.cpp
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@ -52,8 +52,9 @@ namespace Common {
} while (0)
int PowerPackerStream::ppDecrunchBuffer(byte *src, byte *dest, uint32 src_len, uint32 dest_len) {
byte *buf, *out, *dest_end, *off_lens, bits_left = 0, bit_cnt;
int PowerPackerStream::ppDecrunchBuffer(const byte *src, byte *dest, uint32 src_len, uint32 dest_len) {
const byte *buf, *off_lens;
byte *out, *dest_end, bits_left = 0, bit_cnt;
uint32 bit_buffer = 0, x, todo, offbits, offset, written = 0;
if (!src || !dest) return 0;
@ -153,4 +154,23 @@ PowerPackerStream::PowerPackerStream(Common::SeekableReadStream &stream) {
_dispose = true;
}
byte *PowerPackerStream::unpackBuffer(const byte *input, uint32 input_len, uint32 &output_len) {
if (input_len < 8) {
output_len = 0;
return nullptr;
}
uint32 signature = READ_BE_UINT32(input);
if (getCrunchType(signature) == 0) {
output_len = 0;
return nullptr;
}
output_len = READ_BE_UINT32(input + input_len - 4) >> 8;
byte *dest = new byte[output_len];
ppDecrunchBuffer(input + 4, dest, input_len - 12, output_len);
return dest;
}
}

6
common/compression/powerpacker.h
View File

@ -31,12 +31,14 @@ class PowerPackerStream : public Common::SeekableReadStream {
bool _dispose;
private:
int ppDecrunchBuffer(byte *src, byte *dest, uint32 src_len, uint32 dest_len);
uint16 getCrunchType(uint32 signature);
static int ppDecrunchBuffer(const byte *src, byte *dest, uint32 src_len, uint32 dest_len);
static uint16 getCrunchType(uint32 signature);
public:
PowerPackerStream(Common::SeekableReadStream &stream);
static byte *unpackBuffer(const byte *input, uint32 input_len, uint32 &output_len);
~PowerPackerStream() override {
if (_dispose) delete _stream;
}