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1 Commits
| Author | SHA1 | Date | |
|---|---|---|---|
| 48727040b3 |
66
Cargo.lock
generated
66
Cargo.lock
generated
@@ -62,12 +62,6 @@ version = "1.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
|
||||
|
||||
[[package]]
|
||||
name = "lexopt"
|
||||
version = "0.2.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "478ee9e62aaeaf5b140bd4138753d1f109765488581444218d3ddda43234f3e8"
|
||||
|
||||
[[package]]
|
||||
name = "libc"
|
||||
version = "0.2.108"
|
||||
@@ -96,22 +90,10 @@ dependencies = [
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "proc-macro2"
|
||||
version = "1.0.44"
|
||||
name = "pico-args"
|
||||
version = "0.4.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
|
||||
dependencies = [
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "quote"
|
||||
version = "1.0.21"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
]
|
||||
checksum = "db8bcd96cb740d03149cbad5518db9fd87126a10ab519c011893b1754134c468"
|
||||
|
||||
[[package]]
|
||||
name = "sacabase"
|
||||
@@ -122,37 +104,6 @@ dependencies = [
|
||||
"num-traits",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "1.0.101"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thiserror"
|
||||
version = "1.0.36"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0a99cb8c4b9a8ef0e7907cd3b617cc8dc04d571c4e73c8ae403d80ac160bb122"
|
||||
dependencies = [
|
||||
"thiserror-impl",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thiserror-impl"
|
||||
version = "1.0.36"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "3a891860d3c8d66fec8e73ddb3765f90082374dbaaa833407b904a94f1a7eb43"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "time"
|
||||
version = "0.1.44"
|
||||
@@ -164,21 +115,14 @@ dependencies = [
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
|
||||
|
||||
[[package]]
|
||||
name = "upkr"
|
||||
version = "0.2.0"
|
||||
version = "0.1.0"
|
||||
dependencies = [
|
||||
"anyhow",
|
||||
"cdivsufsort",
|
||||
"lexopt",
|
||||
"pbr",
|
||||
"thiserror",
|
||||
"pico-args",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
||||
@@ -1,14 +1,12 @@
|
||||
[package]
|
||||
name = "upkr"
|
||||
version = "0.2.0"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[profile.release]
|
||||
strip = "debuginfo"
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
cdivsufsort = "2"
|
||||
lexopt = "0.2.1"
|
||||
pico-args = "0.4"
|
||||
anyhow = "1"
|
||||
thiserror = "1.0.36"
|
||||
pbr = "1"
|
||||
52
README.md
52
README.md
@@ -2,57 +2,13 @@
|
||||
|
||||
Upkr is a simple general purpose lz packer designed to be used in the [MicroW8](https://github.com/exoticorn/microw8) platform.
|
||||
The compressed format is losely based on [Shrinkler](https://github.com/askeksa/Shrinkler) with the main difference being that
|
||||
Upkr doesn't differentiate between literals at odd or even addresses (by default) and that I went with rANS/rABS instead of a range coder.
|
||||
Upkr doesn't differnetiate between literals at odd or even addresses and that I went with rANS/rABS instead of a range coder.
|
||||
|
||||
Compression rate is on par with Shrinkler.
|
||||
|
||||
The differences compare to Shrinkler also makes it interesting on 8bit platforms. The z80 unpacker included in the release
|
||||
is both about twice as fast and smaller than the Shrinkler unpacker.
|
||||
At this point, Upkr should still be considered unstable - the compressed format is not very likely to change but I still want
|
||||
to keep that option open a little longer.
|
||||
|
||||
## Inspirations:
|
||||
|
||||
* Ferris' blog about his [C64 intro packer](https://yupferris.github.io/blog/2020/08/31/c64-4k-intro-packer-deep-dive.html)
|
||||
* [Shrinkler](https://github.com/askeksa/Shrinkler)
|
||||
* Ryg's [sample rANS implementation](https://github.com/rygorous/ryg_rans)
|
||||
|
||||
## Unpackers
|
||||
|
||||
The release includes a reference c unpacker, as well as some optimized asm unpackers (arm and riscv). The unpckers in
|
||||
c_unpacker and asm_unpackers unpack the default upkr compressed format. The z80_unpacker
|
||||
is based on some variations to the compressed format. (Use `upkr --z80` to select those variations.)
|
||||
An optimized x86 (DOS) unpacker is currently being worked on out of tree.
|
||||
|
||||
## Usage
|
||||
|
||||
```
|
||||
upkr [-l level(0-9)] [config options] <infile> [<outfile>]
|
||||
upkr -u [config options] <infile> [<outfile>]
|
||||
upkr --margin [config options] <infile>
|
||||
|
||||
-l, --level N compression level 0-9
|
||||
-0, ..., -9 short form for setting compression level
|
||||
-u, --unpack unpack infile
|
||||
--margin calculate margin for overlapped unpacking of a packed file
|
||||
|
||||
Config presets for specific unpackers:
|
||||
--z80 --big-endian-bitstream --invert-bit-encoding --simplified-prob-update -9
|
||||
--x86 --bitstream --invert-is-match-bit --invert-continue-value-bit --invert-new-offset-bit
|
||||
--x86b --bitstream --invert-continue-value-bit --no-repeated-offsets -9
|
||||
|
||||
Config options (need to match when packing/unpacking):
|
||||
-b, --bitstream bitstream mode
|
||||
-p, --parity N use N (2/4) parity contexts
|
||||
-r, --reverse reverse input & output
|
||||
|
||||
Config options to tailor output to specific optimized unpackers:
|
||||
--invert-is-match-bit
|
||||
--invert-new-offset-bit
|
||||
--invert-continue-value-bit
|
||||
--invert-bit-encoding
|
||||
--simplified-prob-update
|
||||
--big-endian-bitstream (implies --bitstream)
|
||||
--no-repeated-offsets
|
||||
--eof-in-length
|
||||
--max-offset N
|
||||
--max-length N
|
||||
```
|
||||
* Ryg's [sample rANS implementation](https://github.com/rygorous/ryg_rans)
|
||||
1
asm_unpackers/.gitignore
vendored
1
asm_unpackers/.gitignore
vendored
@@ -1 +0,0 @@
|
||||
/build/
|
||||
@@ -1,64 +0,0 @@
|
||||
build/unpack_riscv64: ../c_unpacker/main.c unpack_riscv.S
|
||||
mkdir -p build
|
||||
riscv64-linux-gnu-gcc -g -static -o $@ $^
|
||||
|
||||
test_riscv64: build/unpack_riscv64
|
||||
qemu-riscv64 $< test_data.upk /tmp/out.bin
|
||||
cmp test_data.bin /tmp/out.bin
|
||||
|
||||
build/unpack_riscv64.o: unpack_riscv.S
|
||||
mkdir -p build
|
||||
riscv64-linux-gnu-gcc -c -o $@ $?
|
||||
|
||||
build/unpack_riscv64.bin: build/unpack_riscv64.o
|
||||
riscv64-linux-gnu-objcopy -O binary --only-section=.text $? $@
|
||||
|
||||
disas-riscv64: build/unpack_riscv64.o
|
||||
riscv64-linux-gnu-objdump -d $?
|
||||
|
||||
build/unpack_riscv32.o: unpack_riscv.S
|
||||
mkdir -p build
|
||||
riscv64-linux-gnu-gcc -march=rv32imc -mabi=ilp32 -c -o $@ $?
|
||||
|
||||
build/unpack_riscv32.bin: build/unpack_riscv32.o
|
||||
riscv64-linux-gnu-objcopy -O binary --only-section=.text $? $@
|
||||
|
||||
disas-riscv32: build/unpack_riscv32.o
|
||||
riscv64-linux-gnu-objdump -d $?
|
||||
|
||||
build/unpack_armv6m: ../c_unpacker/main.c unpack_armv6m.S
|
||||
mkdir -p build
|
||||
arm-linux-gnueabihf-gcc -g -static -o $@ $^
|
||||
|
||||
test_armv6m: build/unpack_armv6m
|
||||
qemu-arm $< test_data.upk /tmp/out.bin
|
||||
cmp test_data.bin /tmp/out.bin
|
||||
|
||||
build/unpack_armv6m.bin: unpack_armv6m.S
|
||||
mkdir -p build
|
||||
arm-none-eabi-gcc -march=armv6-m -c -o build/unpack_armv6m.o $?
|
||||
arm-none-eabi-objcopy -O binary --only-section=.text build/unpack_armv6m.o $@
|
||||
|
||||
build/unpack_arm32: ../c_unpacker/main.c unpack_arm32.S
|
||||
mkdir -p build
|
||||
arm-linux-gnueabihf-gcc -g -static -o $@ $^
|
||||
|
||||
test_arm32: build/unpack_arm32
|
||||
qemu-arm $< test_data.upk /tmp/out.bin
|
||||
cmp test_data.bin /tmp/out.bin
|
||||
|
||||
build/unpack_arm32.bin: unpack_arm32.S
|
||||
mkdir -p build
|
||||
arm-none-eabi-gcc -c -o build/unpack_arm32.o $?
|
||||
arm-none-eabi-objcopy -O binary --only-section=.text build/unpack_arm32.o $@
|
||||
|
||||
build/unpack_c: ../c_unpacker/main.c ../c_unpacker/unpack.c
|
||||
mkdir -p build
|
||||
gcc -g -o $@ $^
|
||||
|
||||
test_c: build/unpack_c
|
||||
$< test_data.upk /tmp/out.bin
|
||||
cmp test_data.bin /tmp/out.bin
|
||||
|
||||
sizes: build/unpack_armv6m.bin build/unpack_riscv64.bin build/unpack_riscv32.bin build/unpack_arm32.bin
|
||||
ls -l build/*.bin
|
||||
@@ -1,99 +0,0 @@
|
||||
typedef unsigned char u8;
|
||||
typedef unsigned short u16;
|
||||
typedef unsigned long u32;
|
||||
|
||||
u8* upkr_data_ptr;
|
||||
u8 upkr_probs[1 + 255 + 1 + 2*32 + 2*32];
|
||||
#ifdef UPKR_BITSTREAM
|
||||
u16 upkr_state;
|
||||
u8 upkr_current_byte;
|
||||
int upkr_bits_left;
|
||||
#else
|
||||
u32 upkr_state;
|
||||
#endif
|
||||
|
||||
int upkr_decode_bit(int context_index) {
|
||||
#ifdef UPKR_BITSTREAM
|
||||
while(upkr_state < 32768) {
|
||||
if(upkr_bits_left == 0) {
|
||||
upkr_current_byte = *upkr_data_ptr++;
|
||||
upkr_bits_left = 8;
|
||||
}
|
||||
upkr_state = (upkr_state << 1) + (upkr_current_byte & 1);
|
||||
upkr_current_byte >>= 1;
|
||||
--upkr_bits_left;
|
||||
}
|
||||
#else
|
||||
while(upkr_state < 4096) {
|
||||
upkr_state = (upkr_state << 8) | *upkr_data_ptr++;
|
||||
}
|
||||
#endif
|
||||
|
||||
int prob = upkr_probs[context_index];
|
||||
int bit = (upkr_state & 255) < prob ? 1 : 0;
|
||||
|
||||
int tmp = prob;
|
||||
if(!bit) {
|
||||
tmp = 256 - tmp;
|
||||
}
|
||||
upkr_state = tmp * (upkr_state >> 8) + (upkr_state & 255);
|
||||
tmp += (256 - tmp + 8) >> 4;
|
||||
if(!bit) {
|
||||
upkr_state -= prob;
|
||||
tmp = 256 - tmp;
|
||||
}
|
||||
upkr_probs[context_index] = tmp;
|
||||
|
||||
return bit;
|
||||
}
|
||||
|
||||
int upkr_decode_length(int context_index) {
|
||||
int length = 0;
|
||||
int bit_pos = 0;
|
||||
while(upkr_decode_bit(context_index)) {
|
||||
length |= upkr_decode_bit(context_index + 1) << bit_pos++;
|
||||
context_index += 2;
|
||||
}
|
||||
return length | (1 << bit_pos);
|
||||
}
|
||||
|
||||
void* upkr_unpack(void* destination, void* compressed_data) {
|
||||
upkr_data_ptr = (u8*)compressed_data;
|
||||
upkr_state = 0;
|
||||
#ifdef UPKR_BITSTREAM
|
||||
upkr_bits_left = 0;
|
||||
#endif
|
||||
for(int i = 0; i < sizeof(upkr_probs); ++i)
|
||||
upkr_probs[i] = 128;
|
||||
|
||||
u8* write_ptr = (u8*)destination;
|
||||
|
||||
int prev_was_match = 0;
|
||||
int offset = 0;
|
||||
for(;;) {
|
||||
if(upkr_decode_bit(0)) {
|
||||
if(prev_was_match || upkr_decode_bit(256)) {
|
||||
offset = upkr_decode_length(257) - 1;
|
||||
if(offset == 0) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
int length = upkr_decode_length(257 + 64);
|
||||
while(length--) {
|
||||
*write_ptr = write_ptr[-offset];
|
||||
++write_ptr;
|
||||
}
|
||||
prev_was_match = 1;
|
||||
} else {
|
||||
int byte = 1;
|
||||
while(byte < 256) {
|
||||
int bit = upkr_decode_bit(byte);
|
||||
byte = (byte << 1) + bit;
|
||||
}
|
||||
*write_ptr++ = byte;
|
||||
prev_was_match = 0;
|
||||
}
|
||||
}
|
||||
|
||||
return write_ptr;
|
||||
}
|
||||
Binary file not shown.
@@ -1,100 +0,0 @@
|
||||
.arm
|
||||
|
||||
.section .text
|
||||
|
||||
.global upkr_unpack
|
||||
.type upkr_unpack, %function
|
||||
// r0 .. out_ptr (returned)
|
||||
// r1 .. in_ptr (returned)
|
||||
// r2 .. state
|
||||
// r3 .. offset
|
||||
// r4 .. prev_was_literal / decode_length ret
|
||||
// r5 .. context index
|
||||
// r6 .. decode_length temp
|
||||
// r7 .. probs ptr
|
||||
// r8-r11 .. decode_bit temp
|
||||
// r12 .. decode_length return address
|
||||
upkr_unpack:
|
||||
push { r3-r11, lr }
|
||||
|
||||
mov r2, #384
|
||||
mov r3, #128
|
||||
.Lclear:
|
||||
subs r2, r2, #1
|
||||
strb r3, [sp, -r2]
|
||||
bne .Lclear
|
||||
|
||||
.Lloop:
|
||||
mov r5, #0
|
||||
bl upkr_decode_bit
|
||||
bcc .Ldata
|
||||
.Lmatch:
|
||||
mov r5, #256
|
||||
rsbs r6, r4, #0
|
||||
blcc upkr_decode_bit
|
||||
bcc .Lskip_offset
|
||||
|
||||
bl upkr_decode_length
|
||||
adds r3, r4, #1
|
||||
popeq { r3-r11, pc }
|
||||
.Lskip_offset:
|
||||
|
||||
mov r5, #256+64
|
||||
bl upkr_decode_length
|
||||
.Lcopy_loop:
|
||||
ldrb r5, [r0, r3]
|
||||
.Lstore:
|
||||
strb r5, [r0], #1
|
||||
adds r4, r4, #1
|
||||
blt .Lcopy_loop
|
||||
b .Lloop
|
||||
|
||||
.Ldata:
|
||||
mov r5, #1
|
||||
|
||||
.Ldata_loop:
|
||||
bl upkr_decode_bit
|
||||
adc r5, r5, r5
|
||||
movs r4, r5, lsr #8
|
||||
beq .Ldata_loop
|
||||
b .Lstore
|
||||
|
||||
.type upkr_decode_length, %function
|
||||
upkr_decode_length:
|
||||
mov r12, lr
|
||||
|
||||
mov r4, #0
|
||||
mvn r6, #0
|
||||
.Lbit_loop:
|
||||
bl upkr_decode_bit_inc
|
||||
addcc r4, r4, r6
|
||||
movcc pc, r12
|
||||
|
||||
bl upkr_decode_bit_inc
|
||||
addcs r4, r4, r6
|
||||
mov r6, r6, lsl #1
|
||||
b .Lbit_loop
|
||||
|
||||
.type upkr_decode_bit, %function
|
||||
upkr_decode_bit_inc:
|
||||
add r5, r5, #1
|
||||
upkr_decode_bit:
|
||||
cmp r2, #4096
|
||||
ldrltb r8, [r1], #1
|
||||
orrlt r2, r8, r2, lsl#8
|
||||
blt upkr_decode_bit
|
||||
|
||||
ldrb r8, [sp, -r5]
|
||||
and r9, r2, #255
|
||||
add r9, r9, #1
|
||||
cmp r8, r9
|
||||
rsbcs r8, r8, #256
|
||||
mvn r9, r2, lsr#8
|
||||
addcs r9, r9, #1
|
||||
mla r2, r8, r9, r2
|
||||
add r9, r8, #8
|
||||
sub r8, r8, r9, lsr#4
|
||||
rsbcs r8, r8, #256
|
||||
strb r8, [sp, -r5]
|
||||
mov pc, r14
|
||||
|
||||
@@ -1,162 +0,0 @@
|
||||
// armv6-m upkr unpacker by yrlf
|
||||
// some optimizations by exoticorn
|
||||
|
||||
.syntax unified
|
||||
.thumb
|
||||
|
||||
.section .text
|
||||
|
||||
#define ALIGNUP(n, align) (((n) + (align) - 1) & ~((align) - 1))
|
||||
#define PROB_LEN (1 + 255 + 1 + 2*32 + 2*32)
|
||||
#define FRAME_SIZE ALIGNUP(PROB_LEN, 4)
|
||||
|
||||
// auto upkr_unpack(uint8_t * out, uint8_t * in) -> tuple<uint8_t *, uint8_t *>
|
||||
.global upkr_unpack
|
||||
.type upkr_unpack, %function
|
||||
// r0 .. out_ptr (returned)
|
||||
// r1 .. in_ptr (returned)
|
||||
// r2 .. state
|
||||
// r3 .. offset
|
||||
// r4 .. prev_was_literal / decode_length ret
|
||||
// r5 .. subroutine arg (preserved)
|
||||
// r6 .. decode_bit ret
|
||||
// r7 .. probs ptr
|
||||
upkr_unpack:
|
||||
push { r4, r5, r6, r7, lr }
|
||||
sub sp, sp, #FRAME_SIZE
|
||||
|
||||
mov r7, sp
|
||||
movs r2, #255
|
||||
adds r2, r2, #(PROB_LEN - 255)
|
||||
movs r3, #128
|
||||
.Lclear:
|
||||
subs r2, r2, #1
|
||||
strb r3, [r7, r2]
|
||||
bne .Lclear
|
||||
|
||||
.Lloop:
|
||||
movs r5, #0
|
||||
bl upkr_decode_bit
|
||||
beq .Ldata
|
||||
.Lmatch:
|
||||
// r6 = 1
|
||||
lsls r5, r6, #8
|
||||
cmp r4, #0
|
||||
beq 1f
|
||||
|
||||
bl upkr_decode_bit
|
||||
beq 2f
|
||||
|
||||
1:
|
||||
bl upkr_decode_length
|
||||
adds r3, r4, #1
|
||||
beq .Lend
|
||||
2:
|
||||
|
||||
adds r5, r5, #64
|
||||
bl upkr_decode_length
|
||||
.Lcopy_loop:
|
||||
ldrb r5, [r0, r3]
|
||||
.Lstore:
|
||||
strb r5, [r0]
|
||||
adds r0, r0, #1
|
||||
adds r4, r4, #1
|
||||
blt .Lcopy_loop
|
||||
b .Lloop
|
||||
|
||||
.Ldata:
|
||||
movs r5, #1
|
||||
|
||||
.Ldata_loop:
|
||||
bl upkr_decode_bit
|
||||
adcs r5, r5, r5
|
||||
lsrs r4, r5, #8
|
||||
beq .Ldata_loop
|
||||
b .Lstore
|
||||
|
||||
.Lend:
|
||||
add sp, sp, #FRAME_SIZE
|
||||
pop { r4, r5, r6, r7, pc }
|
||||
|
||||
.type upkr_decode_length, %function
|
||||
// r0 .. -length tmp (saved)
|
||||
// r1 ..
|
||||
// r2 ..
|
||||
// r3 ..
|
||||
// r4 .. -length (returned)
|
||||
// r5 .. context index (saved)
|
||||
// r6 .. (saved)
|
||||
// r7 ..
|
||||
upkr_decode_length:
|
||||
push { r0, r5, r6, lr }
|
||||
|
||||
movs r0, #0
|
||||
subs r4, r0, #1
|
||||
.Lbit_loop:
|
||||
adds r5, r5, #1
|
||||
bl upkr_decode_bit
|
||||
beq 1f
|
||||
|
||||
adds r5, r5, #1
|
||||
bl upkr_decode_bit
|
||||
beq 2f
|
||||
adds r0, r0, r4
|
||||
2:
|
||||
lsls r4, r4, #1
|
||||
b .Lbit_loop
|
||||
1:
|
||||
adds r4, r4, r0
|
||||
|
||||
pop { r0, r5, r6, pc }
|
||||
|
||||
.type upkr_decode_bit, %function
|
||||
// r0 .. tmp / prob (saved)
|
||||
// r1 .. in_ptr (modified)
|
||||
// r2 .. state (modified)
|
||||
// r3 .. scratch (saved)
|
||||
// r4 ..
|
||||
// r5 .. context index (preserved)
|
||||
// r6 .. bit (returned)
|
||||
// r7 .. probs ptr (preserved)
|
||||
upkr_fill_state:
|
||||
lsls r2, r2, #8
|
||||
ldrb r6, [r1]
|
||||
adds r1, r1, #1
|
||||
orrs r2, r2, r6
|
||||
|
||||
upkr_decode_bit:
|
||||
lsrs r6, r2, #12
|
||||
beq upkr_fill_state
|
||||
|
||||
push { r0, r1, r3, lr }
|
||||
|
||||
ldrb r0, [r7, r5]
|
||||
|
||||
lsrs r3, r2, #8
|
||||
uxtb r1, r2
|
||||
|
||||
subs r6, r1, r0
|
||||
blt 1f
|
||||
|
||||
subs r1, r2, r0
|
||||
rsbs r0, r0, #0
|
||||
1:
|
||||
|
||||
muls r3, r3, r0
|
||||
adds r2, r1, r3
|
||||
|
||||
rsbs r3, r0, #0
|
||||
uxtb r3, r3
|
||||
lsrs r3, r3, #4
|
||||
adcs r0, r0, r3
|
||||
|
||||
cmp r6, #0
|
||||
blt 1f
|
||||
|
||||
rsbs r0, r0, #0
|
||||
1:
|
||||
|
||||
strb r0, [r7, r5]
|
||||
|
||||
lsrs r6, r6, #31
|
||||
pop { r0, r1, r3, pc }
|
||||
@@ -1,131 +0,0 @@
|
||||
.section .text
|
||||
|
||||
// x9 prev was literal
|
||||
// x10 out ptr
|
||||
// x11 in ptr
|
||||
// x12 offset
|
||||
// x13 state
|
||||
// x14 context index
|
||||
|
||||
.global upkr_unpack
|
||||
.type upkr_unpack, %function
|
||||
upkr_unpack:
|
||||
mv t4, ra
|
||||
mv x17, x8
|
||||
mv t6, x9
|
||||
li x9, 256 + 128
|
||||
mv x13, x9
|
||||
1:
|
||||
sub x8, sp, x13
|
||||
sb x9, 0(x8)
|
||||
addi x13, x13, -1
|
||||
bnez x13, 1b
|
||||
|
||||
.Lmainloop:
|
||||
li x14, 0
|
||||
jal upkr_decode_bit
|
||||
beqz x15, .Lliteral
|
||||
|
||||
slli x14, x14, 8
|
||||
beqz x9, .Lread_offset_inc_x14
|
||||
jal upkr_decode_bit
|
||||
bnez x15, .Lread_offset
|
||||
|
||||
.Lfinished_offset:
|
||||
addi x14, x14, 64
|
||||
jalr ra // jal upkr_decode_number
|
||||
1:
|
||||
add x14, x10, t0
|
||||
lbu x14, (x14)
|
||||
.Lstore_byte:
|
||||
sb x14, (x10)
|
||||
addi x10, x10, 1
|
||||
addi x9, x9, 1
|
||||
blt x9, x0, 1b
|
||||
j .Lmainloop
|
||||
|
||||
.Lliteral:
|
||||
jal upkr_decode_bit
|
||||
addi x14, x14, -1
|
||||
slli x14, x14, 1
|
||||
add x14, x14, x15
|
||||
srli x9, x14, 8
|
||||
beqz x9, .Lliteral
|
||||
j .Lstore_byte
|
||||
|
||||
.Lread_offset_inc_x14:
|
||||
addi x14, x14, 1
|
||||
.Lread_offset:
|
||||
jalr ra // jal upkr_decode_number
|
||||
addi t0, x9, 1
|
||||
bnez t0, .Lfinished_offset
|
||||
.Ldone:
|
||||
mv x8, x17
|
||||
mv x9, t6
|
||||
jr t4
|
||||
|
||||
upkr_load_byte:
|
||||
lbu x15, 0(x11)
|
||||
addi x11, x11, 1
|
||||
slli x13, x13, 8
|
||||
add x13, x13, x15
|
||||
// x8 prob array ptr
|
||||
// x11 in ptr
|
||||
// x13 state
|
||||
// x14 context index
|
||||
// return:
|
||||
// x14 context index + 1
|
||||
// x15 decoded bit
|
||||
upkr_decode_bit:
|
||||
srli x15, x13, 12
|
||||
beqz x15, upkr_load_byte
|
||||
|
||||
addi x14, x14, 1
|
||||
|
||||
sub t2, sp, x14
|
||||
lbu x12, (t2)
|
||||
|
||||
andi x8, x13, 255
|
||||
sltu x15, x8, x12
|
||||
beqz x15, 1f
|
||||
xori x12, x12, 255
|
||||
addi x12, x12, 1
|
||||
1:
|
||||
srli x8, x13, 8
|
||||
addi x8, x8, 1
|
||||
sub x8, x8, x15
|
||||
mul x8, x8, x12
|
||||
sub x13, x13, x8
|
||||
|
||||
addi x8, x12, 8
|
||||
srli x8, x8, 4
|
||||
sub x12, x12, x8
|
||||
beqz x15, 1f
|
||||
sub x12, x0, x12
|
||||
1:
|
||||
|
||||
sb x12, (t2)
|
||||
|
||||
jalr ra
|
||||
|
||||
// x14 context index
|
||||
// return: x9 negtive decoded number
|
||||
upkr_decode_number:
|
||||
mv t3, ra
|
||||
mv t5, x14
|
||||
li x9, 0
|
||||
li t1, -1
|
||||
1:
|
||||
jal upkr_decode_bit
|
||||
beqz x15, 1f
|
||||
jal upkr_decode_bit
|
||||
beqz x15, 2f
|
||||
add x9, x9, t1
|
||||
2:
|
||||
add t1, t1, t1
|
||||
j 1b
|
||||
1:
|
||||
add x9, x9, t1
|
||||
|
||||
mv x14, t5
|
||||
jr t3
|
||||
@@ -1,33 +0,0 @@
|
||||
int upkr_decode_bit(int context_index) {
|
||||
#ifdef UPKR_BITSTREAM
|
||||
while(upkr_state < 32768) {
|
||||
if(upkr_bits_left == 0) {
|
||||
upkr_current_byte = *upkr_data_ptr++;
|
||||
upkr_bits_left = 8;
|
||||
}
|
||||
upkr_state = (upkr_state << 1) + (upkr_current_byte & 1);
|
||||
upkr_current_byte >>= 1;
|
||||
--upkr_bits_left;
|
||||
}
|
||||
#else
|
||||
while(upkr_state < 4096) {
|
||||
upkr_state = (upkr_state << 8) | *upkr_data_ptr++;
|
||||
}
|
||||
#endif
|
||||
|
||||
int prob = upkr_probs[context_index];
|
||||
int bit = (upkr_state & 255) < prob ? 1 : 0;
|
||||
|
||||
if(bit) {
|
||||
prob = 256 - prob;
|
||||
}
|
||||
upkr_state -= prob * ((upkr_state >> 8) + (bit ^ 1));
|
||||
prob -= (prob + 8) >> 4;
|
||||
if(bit) {
|
||||
prob = -prob;
|
||||
}
|
||||
upkr_probs[context_index] = prob;
|
||||
|
||||
return bit;
|
||||
}
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
void* upkr_unpack(void* destination, void* compressed_data);
|
||||
int upkr_unpack(void* destination, void* compressed_data);
|
||||
|
||||
int main(int argn, char** argv) {
|
||||
void* input_buffer = malloc(1024*1024);
|
||||
@@ -13,8 +13,7 @@ int main(int argn, char** argv) {
|
||||
|
||||
printf("Compressed size: %d\n", in_size);
|
||||
|
||||
void* end_ptr = upkr_unpack(output_buffer, input_buffer);
|
||||
int out_size = (char*)end_ptr - (char*)output_buffer;
|
||||
int out_size = upkr_unpack(output_buffer, input_buffer);
|
||||
|
||||
printf("Uncompressed size: %d\n", out_size);
|
||||
|
||||
|
||||
@@ -19,8 +19,8 @@ int upkr_decode_bit(int context_index) {
|
||||
upkr_current_byte = *upkr_data_ptr++;
|
||||
upkr_bits_left = 8;
|
||||
}
|
||||
upkr_state = (upkr_state << 1) + (upkr_current_byte & 1);
|
||||
upkr_current_byte >>= 1;
|
||||
upkr_state = (upkr_state << 1) + (upkr_current_byte >> 7);
|
||||
upkr_current_byte <<= 1;
|
||||
--upkr_bits_left;
|
||||
}
|
||||
#else
|
||||
@@ -30,16 +30,18 @@ int upkr_decode_bit(int context_index) {
|
||||
#endif
|
||||
|
||||
int prob = upkr_probs[context_index];
|
||||
int bit = (upkr_state & 255) < prob ? 1 : 0;
|
||||
int bit = (upkr_state & 255) >= prob ? 1 : 0;
|
||||
|
||||
int prob_offset = 16;
|
||||
int state_offset = 0;
|
||||
int state_scale = prob;
|
||||
if(bit) {
|
||||
upkr_state = prob * (upkr_state >> 8) + (upkr_state & 255);
|
||||
prob += (256 - prob + 8) >> 4;
|
||||
} else {
|
||||
upkr_state = (256 - prob) * (upkr_state >> 8) + (upkr_state & 255) - prob;
|
||||
prob -= (prob + 8) >> 4;
|
||||
state_offset = -prob;
|
||||
state_scale = 256 - prob;
|
||||
prob_offset = 0;
|
||||
}
|
||||
upkr_probs[context_index] = prob;
|
||||
upkr_state = state_offset + state_scale * (upkr_state >> 8) + (upkr_state & 255);
|
||||
upkr_probs[context_index] = prob_offset + prob - ((prob + 8) >> 4);
|
||||
|
||||
return bit;
|
||||
}
|
||||
@@ -54,7 +56,7 @@ int upkr_decode_length(int context_index) {
|
||||
return length | (1 << bit_pos);
|
||||
}
|
||||
|
||||
void* upkr_unpack(void* destination, void* compressed_data) {
|
||||
int upkr_unpack(void* destination, void* compressed_data) {
|
||||
upkr_data_ptr = (u8*)compressed_data;
|
||||
upkr_state = 0;
|
||||
#ifdef UPKR_BITSTREAM
|
||||
@@ -92,5 +94,5 @@ void* upkr_unpack(void* destination, void* compressed_data) {
|
||||
}
|
||||
}
|
||||
|
||||
return write_ptr;
|
||||
return write_ptr - (u8*)destination;
|
||||
}
|
||||
|
||||
50
compare-variants
Executable file
50
compare-variants
Executable file
@@ -0,0 +1,50 @@
|
||||
#!/bin/env ruby
|
||||
|
||||
configs = [
|
||||
[:master, '-b'],
|
||||
[:z80, '-b'],
|
||||
[:z80, ['-b', '-r']],
|
||||
['old-prob-update', '-b']
|
||||
]
|
||||
|
||||
files = Dir[ARGV[0] + '/*'].select {|f| !(f =~ /\.txt$/) }
|
||||
short_names = files.map {|f| File.basename(f)[..16] }
|
||||
results = []
|
||||
|
||||
def print_results(configs, names, results)
|
||||
configs.each_with_index do |config, i|
|
||||
printf "%d: %s\n", i + 1, config
|
||||
end
|
||||
|
||||
print ' '
|
||||
configs.each_index do |i|
|
||||
printf " %-4d", i + 1
|
||||
end
|
||||
puts
|
||||
names.each_with_index do |name, i|
|
||||
printf "%16s", name
|
||||
for res in results
|
||||
res = res[i]
|
||||
printf " %-4s", res if res
|
||||
end
|
||||
puts
|
||||
end
|
||||
end
|
||||
|
||||
for config in configs
|
||||
raise unless system('git', 'checkout', config[0].to_s)
|
||||
config_results = []
|
||||
results << config_results
|
||||
for file in files
|
||||
if system(*['cargo', 'run', '--release', 'pack', '-l', '9', config[1], file, '/tmp/out.upk'].flatten) &&
|
||||
system(*['cargo', 'run', '--release', 'unpack', config[1], '/tmp/out.upk', '/tmp/out.bin'].flatten) &&
|
||||
File.read(file) == File.read('/tmp/out.bin')
|
||||
size = File.size('/tmp/out.upk')
|
||||
config_results << size
|
||||
else
|
||||
config_results << 'ERR'
|
||||
end
|
||||
print_results(configs, short_names, results)
|
||||
end
|
||||
end
|
||||
|
||||
3
fuzz/.gitignore
vendored
3
fuzz/.gitignore
vendored
@@ -1,3 +0,0 @@
|
||||
target
|
||||
corpus
|
||||
artifacts
|
||||
247
fuzz/Cargo.lock
generated
247
fuzz/Cargo.lock
generated
@@ -1,247 +0,0 @@
|
||||
# This file is automatically @generated by Cargo.
|
||||
# It is not intended for manual editing.
|
||||
version = 3
|
||||
|
||||
[[package]]
|
||||
name = "anyhow"
|
||||
version = "1.0.65"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "98161a4e3e2184da77bb14f02184cdd111e83bbbcc9979dfee3c44b9a85f5602"
|
||||
|
||||
[[package]]
|
||||
name = "arbitrary"
|
||||
version = "1.1.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "f44124848854b941eafdb34f05b3bcf59472f643c7e151eba7c2b69daa469ed5"
|
||||
|
||||
[[package]]
|
||||
name = "autocfg"
|
||||
version = "1.1.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
|
||||
|
||||
[[package]]
|
||||
name = "cc"
|
||||
version = "1.0.73"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
|
||||
dependencies = [
|
||||
"jobserver",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "cdivsufsort"
|
||||
version = "2.0.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "edefce019197609da416762da75bb000bbd2224b2d89a7e722c2296cbff79b8c"
|
||||
dependencies = [
|
||||
"cc",
|
||||
"sacabase",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "cfg-if"
|
||||
version = "1.0.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
|
||||
|
||||
[[package]]
|
||||
name = "crossbeam-channel"
|
||||
version = "0.5.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c2dd04ddaf88237dc3b8d8f9a3c1004b506b54b3313403944054d23c0870c521"
|
||||
dependencies = [
|
||||
"cfg-if",
|
||||
"crossbeam-utils",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "crossbeam-utils"
|
||||
version = "0.8.11"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "51887d4adc7b564537b15adcfb307936f8075dfcd5f00dde9a9f1d29383682bc"
|
||||
dependencies = [
|
||||
"cfg-if",
|
||||
"once_cell",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "jobserver"
|
||||
version = "0.1.25"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "068b1ee6743e4d11fb9c6a1e6064b3693a1b600e7f5f5988047d98b3dc9fb90b"
|
||||
dependencies = [
|
||||
"libc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "lexopt"
|
||||
version = "0.2.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "478ee9e62aaeaf5b140bd4138753d1f109765488581444218d3ddda43234f3e8"
|
||||
|
||||
[[package]]
|
||||
name = "libc"
|
||||
version = "0.2.133"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c0f80d65747a3e43d1596c7c5492d95d5edddaabd45a7fcdb02b95f644164966"
|
||||
|
||||
[[package]]
|
||||
name = "libfuzzer-sys"
|
||||
version = "0.4.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ae185684fe19814afd066da15a7cc41e126886c21282934225d9fc847582da58"
|
||||
dependencies = [
|
||||
"arbitrary",
|
||||
"cc",
|
||||
"once_cell",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "num-traits"
|
||||
version = "0.2.15"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
|
||||
dependencies = [
|
||||
"autocfg",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "once_cell"
|
||||
version = "1.15.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e82dad04139b71a90c080c8463fe0dc7902db5192d939bd0950f074d014339e1"
|
||||
|
||||
[[package]]
|
||||
name = "pbr"
|
||||
version = "1.0.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ff5751d87f7c00ae6403eb1fcbba229b9c76c9a30de8c1cf87182177b168cea2"
|
||||
dependencies = [
|
||||
"crossbeam-channel",
|
||||
"libc",
|
||||
"time",
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "proc-macro2"
|
||||
version = "1.0.44"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
|
||||
dependencies = [
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "quote"
|
||||
version = "1.0.21"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "sacabase"
|
||||
version = "2.0.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9883fc3d6ce3d78bb54d908602f8bc1f7b5f983afe601dabe083009d86267a84"
|
||||
dependencies = [
|
||||
"num-traits",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "1.0.101"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thiserror"
|
||||
version = "1.0.36"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0a99cb8c4b9a8ef0e7907cd3b617cc8dc04d571c4e73c8ae403d80ac160bb122"
|
||||
dependencies = [
|
||||
"thiserror-impl",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thiserror-impl"
|
||||
version = "1.0.36"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "3a891860d3c8d66fec8e73ddb3765f90082374dbaaa833407b904a94f1a7eb43"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "time"
|
||||
version = "0.1.44"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
|
||||
dependencies = [
|
||||
"libc",
|
||||
"wasi",
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
|
||||
|
||||
[[package]]
|
||||
name = "upkr"
|
||||
version = "0.2.0-pre3"
|
||||
dependencies = [
|
||||
"anyhow",
|
||||
"cdivsufsort",
|
||||
"lexopt",
|
||||
"pbr",
|
||||
"thiserror",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "upkr-fuzz"
|
||||
version = "0.0.0"
|
||||
dependencies = [
|
||||
"libfuzzer-sys",
|
||||
"upkr",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasi"
|
||||
version = "0.10.0+wasi-snapshot-preview1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||
dependencies = [
|
||||
"winapi-i686-pc-windows-gnu",
|
||||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
@@ -1,31 +0,0 @@
|
||||
[package]
|
||||
name = "upkr-fuzz"
|
||||
version = "0.0.0"
|
||||
authors = ["Automatically generated"]
|
||||
publish = false
|
||||
edition = "2018"
|
||||
|
||||
[package.metadata]
|
||||
cargo-fuzz = true
|
||||
|
||||
[dependencies]
|
||||
libfuzzer-sys = "0.4"
|
||||
|
||||
[dependencies.upkr]
|
||||
path = ".."
|
||||
|
||||
# Prevent this from interfering with workspaces
|
||||
[workspace]
|
||||
members = ["."]
|
||||
|
||||
[[bin]]
|
||||
name = "all_configs"
|
||||
path = "fuzz_targets/all_configs.rs"
|
||||
test = false
|
||||
doc = false
|
||||
|
||||
[[bin]]
|
||||
name = "unpack"
|
||||
path = "fuzz_targets/unpack.rs"
|
||||
test = false
|
||||
doc = false
|
||||
@@ -1,29 +0,0 @@
|
||||
#![no_main]
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
let mut config = upkr::Config::default();
|
||||
let mut level = 1;
|
||||
let mut data = data;
|
||||
if data.len() > 2 {
|
||||
let flags1 = data[0];
|
||||
let flags2 = data[1];
|
||||
data = &data[2..];
|
||||
config.use_bitstream = (flags1 & 1) != 0;
|
||||
config.parity_contexts = if (flags1 & 2) == 0 { 1 } else { 2 };
|
||||
config.invert_bit_encoding = (flags1 & 4) != 0;
|
||||
config.is_match_bit = (flags1 & 8) != 0;
|
||||
config.new_offset_bit = (flags1 & 16) != 0;
|
||||
config.continue_value_bit = (flags1 & 32) != 0;
|
||||
config.bitstream_is_big_endian = (flags1 & 64) != 0;
|
||||
config.simplified_prob_update = (flags1 & 128) != 0;
|
||||
config.no_repeated_offsets = (flags2 & 32) != 0;
|
||||
config.eof_in_length = (flags2 & 1) != 0;
|
||||
config.max_offset = if (flags2 & 2) == 0 { usize::MAX } else { 32 };
|
||||
config.max_length = if (flags2 & 4) == 0 { usize::MAX } else { 5 };
|
||||
level = (flags2 >> 3) & 3;
|
||||
}
|
||||
let packed = upkr::pack(data, level, &config, None);
|
||||
let unpacked = upkr::unpack(&packed, &config, 1024 * 1024).unwrap();
|
||||
assert!(unpacked == data);
|
||||
});
|
||||
@@ -1,6 +0,0 @@
|
||||
#![no_main]
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
let _ = upkr::unpack(data, &upkr::Config::default(), 64 * 1024);
|
||||
});
|
||||
4
release/.gitignore
vendored
4
release/.gitignore
vendored
@@ -1,4 +0,0 @@
|
||||
*.zip
|
||||
*.tgz
|
||||
upkr-linux/
|
||||
upkr-windows/
|
||||
@@ -1,35 +0,0 @@
|
||||
VERSION := $(shell cargo run --release -- --version)
|
||||
|
||||
all: clean upkr-linux-$(VERSION).tgz upkr-windows-$(VERSION).zip
|
||||
|
||||
clean:
|
||||
rm -rf upkr-linux
|
||||
rm -f upkr-linux*.tgz
|
||||
rm -rf upkr-windows
|
||||
rm -f upkr-windows*.zip
|
||||
|
||||
upkr-linux-$(VERSION).tgz: upkr-linux/upkr PHONY
|
||||
cp ../README.md upkr-linux
|
||||
cd .. && git archive HEAD c_unpacker | tar -xC release/upkr-linux
|
||||
cd .. && git archive HEAD z80_unpacker | tar -xC release/upkr-linux
|
||||
cd .. && git archive HEAD asm_unpackers | tar -xC release/upkr-linux
|
||||
tar czf $@ upkr-linux
|
||||
|
||||
upkr-windows-$(VERSION).zip: upkr-windows/upkr.exe PHONY
|
||||
cp ../README.md upkr-windows/
|
||||
cd .. && git archive HEAD c_unpacker | tar -xC release/upkr-windows
|
||||
cd .. && git archive HEAD z80_unpacker | tar -xC release/upkr-windows
|
||||
cd .. && git archive HEAD asm_unpackers | tar -xC release/upkr-windows
|
||||
zip -r -9 $@ upkr-windows
|
||||
|
||||
upkr-linux/upkr:
|
||||
cargo build --target x86_64-unknown-linux-musl --release
|
||||
mkdir -p upkr-linux
|
||||
cp ../target/x86_64-unknown-linux-musl/release/upkr upkr-linux/
|
||||
|
||||
upkr-windows/upkr.exe:
|
||||
cargo build --target x86_64-pc-windows-gnu --release
|
||||
mkdir -p upkr-windows
|
||||
cp ../target/x86_64-pc-windows-gnu/release/upkr.exe upkr-windows/
|
||||
|
||||
PHONY:
|
||||
@@ -1,17 +1,12 @@
|
||||
use crate::{
|
||||
rans::{ONE_PROB, PROB_BITS},
|
||||
Config,
|
||||
};
|
||||
use crate::rans::{ONE_PROB, PROB_BITS};
|
||||
|
||||
const INIT_PROB: u16 = 1 << (PROB_BITS - 1);
|
||||
const UPDATE_RATE: u32 = 4;
|
||||
const UPDATE_ADD: u32 = 8;
|
||||
const UPDATE_RATE: i32 = 4;
|
||||
const UPDATE_ADD: i32 = 8;
|
||||
|
||||
#[derive(Clone)]
|
||||
pub struct ContextState {
|
||||
contexts: Vec<u8>,
|
||||
invert_bit_encoding: bool,
|
||||
simplified_prob_update: bool,
|
||||
}
|
||||
|
||||
pub struct Context<'a> {
|
||||
@@ -20,11 +15,9 @@ pub struct Context<'a> {
|
||||
}
|
||||
|
||||
impl ContextState {
|
||||
pub fn new(size: usize, config: &Config) -> ContextState {
|
||||
pub fn new(size: usize) -> ContextState {
|
||||
ContextState {
|
||||
contexts: vec![INIT_PROB as u8; size],
|
||||
invert_bit_encoding: config.invert_bit_encoding,
|
||||
simplified_prob_update: config.simplified_prob_update,
|
||||
}
|
||||
}
|
||||
|
||||
@@ -40,21 +33,13 @@ impl<'a> Context<'a> {
|
||||
|
||||
pub fn update(&mut self, bit: bool) {
|
||||
let old = self.state.contexts[self.index];
|
||||
|
||||
self.state.contexts[self.index] = if self.state.simplified_prob_update {
|
||||
let offset = if bit ^ self.state.invert_bit_encoding {
|
||||
ONE_PROB as i32 >> UPDATE_RATE
|
||||
} else {
|
||||
0
|
||||
};
|
||||
|
||||
(offset + old as i32 - ((old as i32 + UPDATE_ADD as i32) >> UPDATE_RATE)) as u8
|
||||
let offset = if !bit {
|
||||
ONE_PROB as i32 >> UPDATE_RATE
|
||||
} else {
|
||||
if bit ^ self.state.invert_bit_encoding {
|
||||
old + ((ONE_PROB - old as u32 + UPDATE_ADD) >> UPDATE_RATE) as u8
|
||||
} else {
|
||||
old - ((old as u32 + UPDATE_ADD) >> UPDATE_RATE) as u8
|
||||
}
|
||||
0
|
||||
};
|
||||
|
||||
self.state.contexts[self.index] =
|
||||
(offset + old as i32 - ((old as i32 + UPDATE_ADD) >> UPDATE_RATE)) as u8;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,16 +1,16 @@
|
||||
use crate::lz;
|
||||
use crate::match_finder::MatchFinder;
|
||||
use crate::rans::RansCoder;
|
||||
use crate::ProgressCallback;
|
||||
use crate::{lz, Config};
|
||||
|
||||
pub fn pack(
|
||||
data: &[u8],
|
||||
config: &Config,
|
||||
use_bitstream: bool,
|
||||
mut progress_callback: Option<ProgressCallback>,
|
||||
) -> Vec<u8> {
|
||||
let mut match_finder = MatchFinder::new(data);
|
||||
let mut rans_coder = RansCoder::new(config);
|
||||
let mut state = lz::CoderState::new(config);
|
||||
let mut rans_coder = RansCoder::new(use_bitstream);
|
||||
let mut state = lz::CoderState::new();
|
||||
|
||||
let mut pos = 0;
|
||||
while pos < data.len() {
|
||||
@@ -19,16 +19,15 @@ pub fn pack(
|
||||
}
|
||||
let mut encoded_match = false;
|
||||
if let Some(m) = match_finder.matches(pos).next() {
|
||||
let max_offset = config.max_offset.min(1 << (m.length * 3 - 1).min(31));
|
||||
let max_offset = 1 << (m.length * 3 - 1).min(31);
|
||||
let offset = pos - m.pos;
|
||||
if offset < max_offset && m.length >= config.min_length() {
|
||||
let length = m.length.min(config.max_length);
|
||||
if offset < max_offset {
|
||||
lz::Op::Match {
|
||||
offset: offset as u32,
|
||||
len: length as u32,
|
||||
len: m.length as u32,
|
||||
}
|
||||
.encode(&mut rans_coder, &mut state, config);
|
||||
pos += length;
|
||||
.encode(&mut rans_coder, &mut state);
|
||||
pos += m.length;
|
||||
encoded_match = true;
|
||||
}
|
||||
}
|
||||
@@ -40,14 +39,13 @@ pub fn pack(
|
||||
.iter()
|
||||
.zip(data[(pos - offset)..].iter())
|
||||
.take_while(|(a, b)| a == b)
|
||||
.count()
|
||||
.min(config.max_length);
|
||||
if length >= config.min_length() {
|
||||
.count();
|
||||
if length > 0 {
|
||||
lz::Op::Match {
|
||||
offset: offset as u32,
|
||||
len: length as u32,
|
||||
}
|
||||
.encode(&mut rans_coder, &mut state, config);
|
||||
.encode(&mut rans_coder, &mut state);
|
||||
pos += length;
|
||||
encoded_match = true;
|
||||
}
|
||||
@@ -55,11 +53,11 @@ pub fn pack(
|
||||
}
|
||||
|
||||
if !encoded_match {
|
||||
lz::Op::Literal(data[pos]).encode(&mut rans_coder, &mut state, config);
|
||||
lz::Op::Literal(data[pos]).encode(&mut rans_coder, &mut state);
|
||||
pos += 1;
|
||||
}
|
||||
}
|
||||
|
||||
lz::encode_eof(&mut rans_coder, &mut state, config);
|
||||
lz::encode_eof(&mut rans_coder, &mut state);
|
||||
rans_coder.finish()
|
||||
}
|
||||
|
||||
61
src/lib.rs
61
src/lib.rs
@@ -5,73 +5,20 @@ mod match_finder;
|
||||
mod parsing_packer;
|
||||
mod rans;
|
||||
|
||||
pub use lz::{calculate_margin, unpack, UnpackError};
|
||||
pub use lz::unpack;
|
||||
|
||||
pub type ProgressCallback<'a> = &'a mut dyn FnMut(usize);
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct Config {
|
||||
pub use_bitstream: bool,
|
||||
pub parity_contexts: usize,
|
||||
|
||||
pub invert_bit_encoding: bool,
|
||||
pub is_match_bit: bool,
|
||||
pub new_offset_bit: bool,
|
||||
pub continue_value_bit: bool,
|
||||
|
||||
pub bitstream_is_big_endian: bool,
|
||||
pub simplified_prob_update: bool,
|
||||
|
||||
pub no_repeated_offsets: bool,
|
||||
pub eof_in_length: bool,
|
||||
|
||||
pub max_offset: usize,
|
||||
pub max_length: usize,
|
||||
}
|
||||
|
||||
impl Default for Config {
|
||||
fn default() -> Config {
|
||||
Config {
|
||||
use_bitstream: false,
|
||||
parity_contexts: 1,
|
||||
|
||||
invert_bit_encoding: false,
|
||||
is_match_bit: true,
|
||||
new_offset_bit: true,
|
||||
continue_value_bit: true,
|
||||
|
||||
bitstream_is_big_endian: false,
|
||||
simplified_prob_update: false,
|
||||
|
||||
no_repeated_offsets: false,
|
||||
eof_in_length: false,
|
||||
|
||||
max_offset: usize::MAX,
|
||||
max_length: usize::MAX,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Config {
|
||||
pub fn min_length(&self) -> usize {
|
||||
if self.eof_in_length {
|
||||
2
|
||||
} else {
|
||||
1
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn pack(
|
||||
data: &[u8],
|
||||
level: u8,
|
||||
config: &Config,
|
||||
use_bitstream: bool,
|
||||
progress_callback: Option<ProgressCallback>,
|
||||
) -> Vec<u8> {
|
||||
if level == 0 {
|
||||
greedy_packer::pack(data, config, progress_callback)
|
||||
greedy_packer::pack(data, use_bitstream, progress_callback)
|
||||
} else {
|
||||
parsing_packer::pack(data, level, config, progress_callback)
|
||||
parsing_packer::pack(data, level, use_bitstream, progress_callback)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
198
src/lz.rs
198
src/lz.rs
@@ -1,7 +1,5 @@
|
||||
use crate::context_state::ContextState;
|
||||
use crate::rans::{EntropyCoder, RansDecoder};
|
||||
use crate::Config;
|
||||
use thiserror::Error;
|
||||
|
||||
#[derive(Copy, Clone, Debug)]
|
||||
pub enum Op {
|
||||
@@ -10,73 +8,42 @@ pub enum Op {
|
||||
}
|
||||
|
||||
impl Op {
|
||||
pub fn encode(&self, coder: &mut dyn EntropyCoder, state: &mut CoderState, config: &Config) {
|
||||
let literal_base = state.pos % state.parity_contexts * 256;
|
||||
pub fn encode(&self, coder: &mut dyn EntropyCoder, state: &mut CoderState) {
|
||||
match self {
|
||||
&Op::Literal(lit) => {
|
||||
encode_bit(coder, state, literal_base, !config.is_match_bit);
|
||||
encode_bit(coder, state, 0, false);
|
||||
let mut context_index = 1;
|
||||
for i in (0..8).rev() {
|
||||
let bit = (lit >> i) & 1 != 0;
|
||||
encode_bit(coder, state, literal_base + context_index, bit);
|
||||
encode_bit(coder, state, context_index, bit);
|
||||
context_index = (context_index << 1) | bit as usize;
|
||||
}
|
||||
state.prev_was_match = false;
|
||||
state.pos += 1;
|
||||
}
|
||||
&Op::Match { offset, len } => {
|
||||
encode_bit(coder, state, literal_base, config.is_match_bit);
|
||||
let mut new_offset = true;
|
||||
if !state.prev_was_match && !config.no_repeated_offsets {
|
||||
new_offset = offset != state.last_offset;
|
||||
encode_bit(
|
||||
coder,
|
||||
state,
|
||||
256 * state.parity_contexts,
|
||||
new_offset == config.new_offset_bit,
|
||||
);
|
||||
encode_bit(coder, state, 0, true);
|
||||
if !state.prev_was_match {
|
||||
encode_bit(coder, state, 256, offset != state.last_offset);
|
||||
} else {
|
||||
assert!(offset != state.last_offset);
|
||||
}
|
||||
assert!(offset as usize <= config.max_offset);
|
||||
if new_offset {
|
||||
encode_length(
|
||||
coder,
|
||||
state,
|
||||
256 * state.parity_contexts + 1,
|
||||
offset + if config.eof_in_length { 0 } else { 1 },
|
||||
config,
|
||||
);
|
||||
if offset != state.last_offset {
|
||||
encode_length(coder, state, 257, offset + 1);
|
||||
state.last_offset = offset;
|
||||
}
|
||||
assert!(len as usize >= config.min_length() && len as usize <= config.max_length);
|
||||
encode_length(coder, state, 256 * state.parity_contexts + 65, len, config);
|
||||
encode_length(coder, state, 257 + 64, len);
|
||||
state.prev_was_match = true;
|
||||
state.pos += len as usize;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn encode_eof(coder: &mut dyn EntropyCoder, state: &mut CoderState, config: &Config) {
|
||||
encode_bit(
|
||||
coder,
|
||||
state,
|
||||
state.pos % state.parity_contexts * 256,
|
||||
config.is_match_bit,
|
||||
);
|
||||
if !state.prev_was_match && !config.no_repeated_offsets {
|
||||
encode_bit(
|
||||
coder,
|
||||
state,
|
||||
256 * state.parity_contexts,
|
||||
config.new_offset_bit ^ config.eof_in_length,
|
||||
);
|
||||
}
|
||||
if !config.eof_in_length || state.prev_was_match || config.no_repeated_offsets {
|
||||
encode_length(coder, state, 256 * state.parity_contexts + 1, 1, config);
|
||||
}
|
||||
if config.eof_in_length {
|
||||
encode_length(coder, state, 256 * state.parity_contexts + 65, 1, config);
|
||||
pub fn encode_eof(coder: &mut dyn EntropyCoder, state: &mut CoderState) {
|
||||
encode_bit(coder, state, 0, true);
|
||||
if !state.prev_was_match {
|
||||
encode_bit(coder, state, 256, true);
|
||||
}
|
||||
encode_length(coder, state, 257, 1);
|
||||
}
|
||||
|
||||
fn encode_bit(
|
||||
@@ -93,18 +60,17 @@ fn encode_length(
|
||||
state: &mut CoderState,
|
||||
context_start: usize,
|
||||
mut value: u32,
|
||||
config: &Config,
|
||||
) {
|
||||
assert!(value >= 1);
|
||||
|
||||
let mut context_index = context_start;
|
||||
while value >= 2 {
|
||||
encode_bit(coder, state, context_index, config.continue_value_bit);
|
||||
encode_bit(coder, state, context_index, true);
|
||||
encode_bit(coder, state, context_index + 1, value & 1 != 0);
|
||||
context_index += 2;
|
||||
value >>= 1;
|
||||
}
|
||||
encode_bit(coder, state, context_index, !config.continue_value_bit);
|
||||
encode_bit(coder, state, context_index, false);
|
||||
}
|
||||
|
||||
#[derive(Clone)]
|
||||
@@ -112,18 +78,14 @@ pub struct CoderState {
|
||||
contexts: ContextState,
|
||||
last_offset: u32,
|
||||
prev_was_match: bool,
|
||||
pos: usize,
|
||||
parity_contexts: usize,
|
||||
}
|
||||
|
||||
impl CoderState {
|
||||
pub fn new(config: &Config) -> CoderState {
|
||||
pub fn new() -> CoderState {
|
||||
CoderState {
|
||||
contexts: ContextState::new((1 + 255) * config.parity_contexts + 1 + 64 + 64, config),
|
||||
contexts: ContextState::new(1 + 255 + 1 + 64 + 64),
|
||||
last_offset: 0,
|
||||
prev_was_match: false,
|
||||
pos: 0,
|
||||
parity_contexts: config.parity_contexts,
|
||||
}
|
||||
}
|
||||
|
||||
@@ -132,141 +94,55 @@ impl CoderState {
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Error, Debug)]
|
||||
pub enum UnpackError {
|
||||
#[error("match offset out of range: {offset} > {position}")]
|
||||
OffsetOutOfRange { offset: usize, position: usize },
|
||||
#[error("Unpacked data over size limit: {size} > {limit}")]
|
||||
OverSize { size: usize, limit: usize },
|
||||
#[error("Unexpected end of input data")]
|
||||
UnexpectedEOF {
|
||||
#[from]
|
||||
source: crate::rans::UnexpectedEOF,
|
||||
},
|
||||
#[error("Overflow while reading value")]
|
||||
ValueOverflow,
|
||||
}
|
||||
|
||||
pub fn unpack(
|
||||
packed_data: &[u8],
|
||||
config: &Config,
|
||||
max_size: usize,
|
||||
) -> Result<Vec<u8>, UnpackError> {
|
||||
pub fn unpack(packed_data: &[u8], use_bitstream: bool) -> Vec<u8> {
|
||||
let mut decoder = RansDecoder::new(packed_data, use_bitstream);
|
||||
let mut contexts = ContextState::new(1 + 255 + 1 + 64 + 64);
|
||||
let mut result = vec![];
|
||||
let _ = unpack_internal(Some(&mut result), packed_data, config, max_size)?;
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
pub fn calculate_margin(packed_data: &[u8], config: &Config) -> Result<isize, UnpackError> {
|
||||
unpack_internal(None, packed_data, config, usize::MAX)
|
||||
}
|
||||
|
||||
pub fn unpack_internal(
|
||||
mut result: Option<&mut Vec<u8>>,
|
||||
packed_data: &[u8],
|
||||
config: &Config,
|
||||
max_size: usize,
|
||||
) -> Result<isize, UnpackError> {
|
||||
let mut decoder = RansDecoder::new(packed_data, &config);
|
||||
let mut contexts = ContextState::new((1 + 255) * config.parity_contexts + 1 + 64 + 64, &config);
|
||||
let mut offset = usize::MAX;
|
||||
let mut position = 0usize;
|
||||
let mut offset = 0;
|
||||
let mut prev_was_match = false;
|
||||
let mut margin = 0isize;
|
||||
|
||||
fn decode_length(
|
||||
decoder: &mut RansDecoder,
|
||||
contexts: &mut ContextState,
|
||||
mut context_index: usize,
|
||||
config: &Config,
|
||||
) -> Result<usize, UnpackError> {
|
||||
) -> usize {
|
||||
let mut length = 0;
|
||||
let mut bit_pos = 0;
|
||||
while decoder.decode_with_context(&mut contexts.context_mut(context_index))?
|
||||
== config.continue_value_bit
|
||||
{
|
||||
length |= (decoder.decode_with_context(&mut contexts.context_mut(context_index + 1))?
|
||||
while decoder.decode_with_context(&mut contexts.context_mut(context_index)) {
|
||||
length |= (decoder.decode_with_context(&mut contexts.context_mut(context_index + 1))
|
||||
as usize)
|
||||
<< bit_pos;
|
||||
bit_pos += 1;
|
||||
if bit_pos >= 32 {
|
||||
return Err(UnpackError::ValueOverflow);
|
||||
}
|
||||
context_index += 2;
|
||||
}
|
||||
Ok(length | (1 << bit_pos))
|
||||
length | (1 << bit_pos)
|
||||
}
|
||||
|
||||
loop {
|
||||
margin = margin.max(position as isize - decoder.pos() as isize);
|
||||
let literal_base = position % config.parity_contexts * 256;
|
||||
if decoder.decode_with_context(&mut contexts.context_mut(literal_base))?
|
||||
== config.is_match_bit
|
||||
{
|
||||
if config.no_repeated_offsets
|
||||
|| prev_was_match
|
||||
|| decoder
|
||||
.decode_with_context(&mut contexts.context_mut(256 * config.parity_contexts))?
|
||||
== config.new_offset_bit
|
||||
{
|
||||
offset = decode_length(
|
||||
&mut decoder,
|
||||
&mut contexts,
|
||||
256 * config.parity_contexts + 1,
|
||||
&config,
|
||||
)? - if config.eof_in_length { 0 } else { 1 };
|
||||
if decoder.decode_with_context(&mut contexts.context_mut(0)) {
|
||||
if prev_was_match || decoder.decode_with_context(&mut contexts.context_mut(256)) {
|
||||
offset = decode_length(&mut decoder, &mut contexts, 257) - 1;
|
||||
if offset == 0 {
|
||||
break;
|
||||
}
|
||||
}
|
||||
let length = decode_length(
|
||||
&mut decoder,
|
||||
&mut contexts,
|
||||
256 * config.parity_contexts + 65,
|
||||
&config,
|
||||
)?;
|
||||
if config.eof_in_length && length == 1 {
|
||||
break;
|
||||
let length = decode_length(&mut decoder, &mut contexts, 257 + 64);
|
||||
for _ in 0..length {
|
||||
result.push(result[result.len() - offset]);
|
||||
}
|
||||
if offset > position {
|
||||
return Err(UnpackError::OffsetOutOfRange { offset, position });
|
||||
}
|
||||
if let Some(ref mut result) = result {
|
||||
for _ in 0..length {
|
||||
if result.len() < max_size {
|
||||
result.push(result[result.len() - offset]);
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
position += length;
|
||||
prev_was_match = true;
|
||||
} else {
|
||||
let mut context_index = 1;
|
||||
let mut byte = 0;
|
||||
for i in (0..8).rev() {
|
||||
let bit = decoder
|
||||
.decode_with_context(&mut contexts.context_mut(literal_base + context_index))?;
|
||||
let bit = decoder.decode_with_context(&mut contexts.context_mut(context_index));
|
||||
context_index = (context_index << 1) | bit as usize;
|
||||
byte |= (bit as u8) << i;
|
||||
}
|
||||
if let Some(ref mut result) = result {
|
||||
if result.len() < max_size {
|
||||
result.push(byte);
|
||||
}
|
||||
}
|
||||
position += 1;
|
||||
result.push(byte);
|
||||
prev_was_match = false;
|
||||
}
|
||||
}
|
||||
|
||||
if position > max_size {
|
||||
return Err(UnpackError::OverSize {
|
||||
size: position,
|
||||
limit: max_size,
|
||||
});
|
||||
}
|
||||
|
||||
Ok(margin + decoder.pos() as isize - position as isize)
|
||||
result
|
||||
}
|
||||
|
||||
216
src/main.rs
216
src/main.rs
@@ -1,190 +1,82 @@
|
||||
use anyhow::Result;
|
||||
use std::ffi::OsStr;
|
||||
use anyhow::{bail, Result};
|
||||
use std::io::prelude::*;
|
||||
use std::process;
|
||||
use std::{fs::File, path::PathBuf};
|
||||
|
||||
fn main() -> Result<()> {
|
||||
let mut config = upkr::Config::default();
|
||||
let mut reverse = false;
|
||||
let mut unpack = false;
|
||||
let mut calculate_margin = false;
|
||||
let mut level = 2;
|
||||
let mut infile: Option<PathBuf> = None;
|
||||
let mut outfile: Option<PathBuf> = None;
|
||||
let mut max_unpacked_size = 512 * 1024 * 1024;
|
||||
let mut args = pico_args::Arguments::from_env();
|
||||
|
||||
let mut parser = lexopt::Parser::from_env();
|
||||
while let Some(arg) = parser.next()? {
|
||||
use lexopt::prelude::*;
|
||||
match arg {
|
||||
Short('b') | Long("bitstream") => config.use_bitstream = true,
|
||||
Short('p') | Long("parity") => config.parity_contexts = parser.value()?.parse()?,
|
||||
Short('r') | Long("reverse") => reverse = true,
|
||||
Long("invert-is-match-bit") => config.is_match_bit = false,
|
||||
Long("invert-new-offset-bit") => config.new_offset_bit = false,
|
||||
Long("invert-continue-value-bit") => config.continue_value_bit = false,
|
||||
Long("invert-bit-encoding") => config.invert_bit_encoding = true,
|
||||
Long("simplified-prob-update") => config.simplified_prob_update = true,
|
||||
Long("big-endian-bitstream") => {
|
||||
config.use_bitstream = true;
|
||||
config.bitstream_is_big_endian = true;
|
||||
}
|
||||
Long("no-repeated-offsets") => config.no_repeated_offsets = true,
|
||||
Long("eof-in-length") => config.eof_in_length = true,
|
||||
match args.subcommand()?.as_ref().map(|s| s.as_str()) {
|
||||
None => print_help(),
|
||||
Some("pack") => {
|
||||
let level = args.opt_value_from_str(["-l", "--level"])?.unwrap_or(2u8);
|
||||
let use_bitstream = args.contains(["-b", "--bitstream"]);
|
||||
let reverse = args.contains(["-r", "--reverse"]);
|
||||
|
||||
Long("max-offset") => config.max_offset = parser.value()?.parse()?,
|
||||
Long("max-length") => config.max_length = parser.value()?.parse()?,
|
||||
let infile = args.free_from_os_str::<PathBuf, bool>(|s| Ok(s.into()))?;
|
||||
let outfile = args.free_from_os_str::<PathBuf, bool>(|s| Ok(s.into()))?;
|
||||
|
||||
Long("z80") => {
|
||||
config.use_bitstream = true;
|
||||
config.bitstream_is_big_endian = true;
|
||||
config.invert_bit_encoding = true;
|
||||
config.simplified_prob_update = true;
|
||||
level = 9;
|
||||
}
|
||||
Long("x86") => {
|
||||
config.use_bitstream = true;
|
||||
config.continue_value_bit = false;
|
||||
config.is_match_bit = false;
|
||||
config.new_offset_bit = false;
|
||||
}
|
||||
Long("x86b") => {
|
||||
config.use_bitstream = true;
|
||||
config.continue_value_bit = false;
|
||||
config.no_repeated_offsets = true;
|
||||
level = 9;
|
||||
let mut data = vec![];
|
||||
File::open(infile)?.read_to_end(&mut data)?;
|
||||
if reverse {
|
||||
data.reverse();
|
||||
}
|
||||
|
||||
Short('u') | Long("unpack") => unpack = true,
|
||||
Long("margin") => calculate_margin = true,
|
||||
Short('l') | Long("level") => level = parser.value()?.parse()?,
|
||||
Short(n) if n.is_ascii_digit() => level = n as u8 - b'0',
|
||||
Short('h') | Long("help") => print_help(0),
|
||||
Long("version") => {
|
||||
println!("{}", env!("CARGO_PKG_VERSION"));
|
||||
process::exit(0);
|
||||
let mut pb = pbr::ProgressBar::new(data.len() as u64);
|
||||
pb.set_units(pbr::Units::Bytes);
|
||||
let mut packed_data = upkr::pack(
|
||||
&data,
|
||||
level,
|
||||
use_bitstream,
|
||||
Some(&mut |pos| {
|
||||
pb.set(pos as u64);
|
||||
}),
|
||||
);
|
||||
pb.finish();
|
||||
|
||||
if reverse {
|
||||
packed_data.reverse();
|
||||
}
|
||||
Long("max-unpacked-size") => max_unpacked_size = parser.value()?.parse()?,
|
||||
Value(val) if infile.is_none() => infile = Some(val.try_into()?),
|
||||
Value(val) if outfile.is_none() => outfile = Some(val.try_into()?),
|
||||
_ => return Err(arg.unexpected().into()),
|
||||
|
||||
println!(
|
||||
"Compressed {} bytes to {} bytes ({}%)",
|
||||
data.len(),
|
||||
packed_data.len(),
|
||||
packed_data.len() as f32 * 100. / data.len() as f32
|
||||
);
|
||||
File::create(outfile)?.write_all(&packed_data)?;
|
||||
}
|
||||
}
|
||||
Some("unpack") => {
|
||||
let use_bitstream = args.contains(["-b", "--bitstream"]);
|
||||
let reverse = args.contains(["-r", "--reverse"]);
|
||||
|
||||
let infile = infile.unwrap_or_else(|| print_help(1));
|
||||
let outfile = outfile.unwrap_or_else(|| {
|
||||
let mut name = infile.clone();
|
||||
if unpack {
|
||||
if name.extension().filter(|&e| e == "upk").is_some() {
|
||||
name.set_extension("");
|
||||
} else {
|
||||
name.set_extension("bin");
|
||||
let infile = args.free_from_os_str::<PathBuf, bool>(|s| Ok(s.into()))?;
|
||||
let outfile = args.free_from_os_str::<PathBuf, bool>(|s| Ok(s.into()))?;
|
||||
|
||||
let mut data = vec![];
|
||||
File::open(infile)?.read_to_end(&mut data)?;
|
||||
if reverse {
|
||||
data.reverse();
|
||||
}
|
||||
} else {
|
||||
let mut filename = name
|
||||
.file_name()
|
||||
.unwrap_or_else(|| OsStr::new(""))
|
||||
.to_os_string();
|
||||
filename.push(".upk");
|
||||
name.set_file_name(filename);
|
||||
}
|
||||
name
|
||||
});
|
||||
|
||||
if config.parity_contexts != 1 && config.parity_contexts != 2 && config.parity_contexts != 4 {
|
||||
eprintln!("--parity has to be 1, 2, or 4");
|
||||
process::exit(1);
|
||||
}
|
||||
|
||||
if !unpack && !calculate_margin {
|
||||
let mut data = vec![];
|
||||
File::open(infile)?.read_to_end(&mut data)?;
|
||||
if reverse {
|
||||
data.reverse();
|
||||
}
|
||||
|
||||
let mut pb = pbr::ProgressBar::new(data.len() as u64);
|
||||
pb.set_units(pbr::Units::Bytes);
|
||||
let mut packed_data = upkr::pack(
|
||||
&data,
|
||||
level,
|
||||
&config,
|
||||
Some(&mut |pos| {
|
||||
pb.set(pos as u64);
|
||||
}),
|
||||
);
|
||||
pb.finish();
|
||||
|
||||
if reverse {
|
||||
packed_data.reverse();
|
||||
}
|
||||
|
||||
println!(
|
||||
"Compressed {} bytes to {} bytes ({}%)",
|
||||
data.len(),
|
||||
packed_data.len(),
|
||||
packed_data.len() as f32 * 100. / data.len() as f32
|
||||
);
|
||||
File::create(outfile)?.write_all(&packed_data)?;
|
||||
} else {
|
||||
let mut data = vec![];
|
||||
File::open(infile)?.read_to_end(&mut data)?;
|
||||
if reverse {
|
||||
data.reverse();
|
||||
}
|
||||
if unpack {
|
||||
let mut unpacked_data = upkr::unpack(&data, &config, max_unpacked_size)?;
|
||||
let mut unpacked_data = upkr::unpack(&data, use_bitstream);
|
||||
if reverse {
|
||||
unpacked_data.reverse();
|
||||
}
|
||||
File::create(outfile)?.write_all(&unpacked_data)?;
|
||||
}
|
||||
if calculate_margin {
|
||||
println!("{}", upkr::calculate_margin(&data, &config)?);
|
||||
Some(other) => {
|
||||
bail!("Unknown subcommand '{}'", other);
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn print_help(exit_code: i32) -> ! {
|
||||
fn print_help() {
|
||||
eprintln!("Usage:");
|
||||
eprintln!(" upkr [-l level(0-9)] [config options] <infile> [<outfile>]");
|
||||
eprintln!(" upkr -u [config options] <infile> [<outfile>]");
|
||||
eprintln!(" upkr --margin [config options] <infile>");
|
||||
eprintln!(" upkr pack [-b] [-l level(0-9)] <infile> <outfile>");
|
||||
eprintln!(" upkr unpack [-b] <infile> <outfile>");
|
||||
eprintln!();
|
||||
eprintln!(" -l, --level N compression level 0-9");
|
||||
eprintln!(" -0, ..., -9 short form for setting compression level");
|
||||
eprintln!(" -u, --unpack unpack infile");
|
||||
eprintln!(" --margin calculate margin for overlapped unpacking of a packed file");
|
||||
eprintln!();
|
||||
eprintln!("Version: {}", env!("CARGO_PKG_VERSION"));
|
||||
eprintln!();
|
||||
eprintln!("Config presets for specific unpackers:");
|
||||
eprintln!(" --z80 --big-endian-bitstream --invert-bit-encoding --simplified-prob-update -9");
|
||||
eprintln!(
|
||||
" --x86 --bitstream --invert-is-match-bit --invert-continue-value-bit --invert-new-offset-bit"
|
||||
);
|
||||
eprintln!(
|
||||
" --x86b --bitstream --invert-continue-value-bit --no-repeated-offsets -9"
|
||||
);
|
||||
eprintln!();
|
||||
eprintln!("Config options (need to match when packing/unpacking):");
|
||||
eprintln!(" -b, --bitstream bitstream mode");
|
||||
eprintln!(" -p, --parity N use N (2/4) parity contexts");
|
||||
eprintln!(" -r, --reverse reverse input & output");
|
||||
eprintln!();
|
||||
eprintln!("Config options to tailor output to specific optimized unpackers:");
|
||||
eprintln!(" --invert-is-match-bit");
|
||||
eprintln!(" --invert-new-offset-bit");
|
||||
eprintln!(" --invert-continue-value-bit");
|
||||
eprintln!(" --invert-bit-encoding");
|
||||
eprintln!(" --simplified-prob-update");
|
||||
eprintln!(" --big-endian-bitstream (implies --bitstream)");
|
||||
eprintln!(" --no-repeated-offsets");
|
||||
eprintln!(" --eof-in-length");
|
||||
eprintln!(" --max-offset N");
|
||||
eprintln!(" --max-length N");
|
||||
process::exit(exit_code);
|
||||
eprintln!(" -l, --level N compression level 0-9");
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
@@ -6,24 +6,19 @@ use crate::match_finder::MatchFinder;
|
||||
use crate::rans::{CostCounter, RansCoder};
|
||||
use crate::{lz, ProgressCallback};
|
||||
|
||||
pub fn pack(
|
||||
data: &[u8],
|
||||
level: u8,
|
||||
config: &crate::Config,
|
||||
progress_cb: Option<ProgressCallback>,
|
||||
) -> Vec<u8> {
|
||||
let mut parse = parse(data, Config::from_level(level), config, progress_cb);
|
||||
pub fn pack(data: &[u8], level: u8, use_bitstream: bool, progress_cb: Option<ProgressCallback>) -> Vec<u8> {
|
||||
let mut parse = parse(data, Config::from_level(level), progress_cb);
|
||||
let mut ops = vec![];
|
||||
while let Some(link) = parse {
|
||||
ops.push(link.op);
|
||||
parse = link.prev.clone();
|
||||
}
|
||||
let mut state = lz::CoderState::new(config);
|
||||
let mut coder = RansCoder::new(config);
|
||||
let mut state = lz::CoderState::new();
|
||||
let mut coder = RansCoder::new(use_bitstream);
|
||||
for op in ops.into_iter().rev() {
|
||||
op.encode(&mut coder, &mut state, config);
|
||||
op.encode(&mut coder, &mut state);
|
||||
}
|
||||
lz::encode_eof(&mut coder, &mut state, config);
|
||||
lz::encode_eof(&mut coder, &mut state);
|
||||
coder.finish()
|
||||
}
|
||||
|
||||
@@ -43,7 +38,6 @@ type Arrivals = HashMap<usize, Vec<Arrival>>;
|
||||
fn parse(
|
||||
data: &[u8],
|
||||
config: Config,
|
||||
encoding_config: &crate::Config,
|
||||
mut progress_cb: Option<ProgressCallback>,
|
||||
) -> Option<Rc<Parse>> {
|
||||
let mut match_finder = MatchFinder::new(data)
|
||||
@@ -105,22 +99,17 @@ fn parse(
|
||||
cost_counter: &mut CostCounter,
|
||||
pos: usize,
|
||||
offset: usize,
|
||||
mut length: usize,
|
||||
length: usize,
|
||||
arrival: &Arrival,
|
||||
max_arrivals: usize,
|
||||
config: &crate::Config,
|
||||
) {
|
||||
if length < config.min_length() {
|
||||
return;
|
||||
}
|
||||
length = length.min(config.max_length);
|
||||
cost_counter.reset();
|
||||
let mut state = arrival.state.clone();
|
||||
let op = lz::Op::Match {
|
||||
offset: offset as u32,
|
||||
len: length as u32,
|
||||
};
|
||||
op.encode(cost_counter, &mut state, config);
|
||||
op.encode(cost_counter, &mut state);
|
||||
add_arrival(
|
||||
arrivals,
|
||||
pos + length,
|
||||
@@ -140,13 +129,13 @@ fn parse(
|
||||
0,
|
||||
Arrival {
|
||||
parse: None,
|
||||
state: lz::CoderState::new(encoding_config),
|
||||
state: lz::CoderState::new(),
|
||||
cost: 0.0,
|
||||
},
|
||||
max_arrivals,
|
||||
);
|
||||
|
||||
let cost_counter = &mut CostCounter::new(encoding_config);
|
||||
let cost_counter = &mut CostCounter::new();
|
||||
let mut best_per_offset = HashMap::new();
|
||||
for pos in 0..data.len() {
|
||||
let match_length = |offset: usize| {
|
||||
@@ -187,21 +176,18 @@ fn parse(
|
||||
for m in match_finder.matches(pos) {
|
||||
closest_match = Some(closest_match.unwrap_or(0).max(m.pos));
|
||||
let offset = pos - m.pos;
|
||||
if offset <= encoding_config.max_offset {
|
||||
found_last_offset |= offset as u32 == arrival.state.last_offset();
|
||||
add_match(
|
||||
&mut arrivals,
|
||||
cost_counter,
|
||||
pos,
|
||||
offset,
|
||||
m.length,
|
||||
&arrival,
|
||||
max_arrivals,
|
||||
encoding_config,
|
||||
);
|
||||
if m.length >= config.greedy_size {
|
||||
break 'arrival_loop;
|
||||
}
|
||||
found_last_offset |= offset as u32 == arrival.state.last_offset();
|
||||
add_match(
|
||||
&mut arrivals,
|
||||
cost_counter,
|
||||
pos,
|
||||
offset,
|
||||
m.length,
|
||||
&arrival,
|
||||
max_arrivals,
|
||||
);
|
||||
if m.length >= config.greedy_size {
|
||||
break 'arrival_loop;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -212,9 +198,6 @@ fn parse(
|
||||
&& closest_match.iter().all(|p| *p < match_pos)
|
||||
{
|
||||
let offset = pos - match_pos;
|
||||
if offset > encoding_config.max_offset {
|
||||
break;
|
||||
}
|
||||
let length = match_length(offset);
|
||||
assert!(length > 0);
|
||||
add_match(
|
||||
@@ -225,7 +208,6 @@ fn parse(
|
||||
length,
|
||||
&arrival,
|
||||
max_arrivals,
|
||||
encoding_config,
|
||||
);
|
||||
found_last_offset |= offset as u32 == arrival.state.last_offset();
|
||||
if offset < near_matches.len() {
|
||||
@@ -246,7 +228,6 @@ fn parse(
|
||||
length,
|
||||
&arrival,
|
||||
max_arrivals,
|
||||
encoding_config,
|
||||
);
|
||||
}
|
||||
}
|
||||
@@ -254,7 +235,7 @@ fn parse(
|
||||
cost_counter.reset();
|
||||
let mut state = arrival.state;
|
||||
let op = lz::Op::Literal(data[pos]);
|
||||
op.encode(cost_counter, &mut state, encoding_config);
|
||||
op.encode(cost_counter, &mut state);
|
||||
add_arrival(
|
||||
&mut arrivals,
|
||||
pos + 1,
|
||||
|
||||
114
src/rans.rs
114
src/rans.rs
@@ -1,5 +1,4 @@
|
||||
use crate::{context_state::Context, Config};
|
||||
use thiserror::Error;
|
||||
use crate::context_state::Context;
|
||||
|
||||
pub const PROB_BITS: u32 = 8;
|
||||
pub const ONE_PROB: u32 = 1 << PROB_BITS;
|
||||
@@ -16,25 +15,20 @@ pub trait EntropyCoder {
|
||||
pub struct RansCoder {
|
||||
bits: Vec<u16>,
|
||||
use_bitstream: bool,
|
||||
bitstream_is_big_endian: bool,
|
||||
invert_bit_encoding: bool,
|
||||
}
|
||||
|
||||
impl EntropyCoder for RansCoder {
|
||||
fn encode_bit(&mut self, bit: bool, prob: u16) {
|
||||
assert!(prob < 32768);
|
||||
self.bits
|
||||
.push(prob | (((bit ^ self.invert_bit_encoding) as u16) << 15));
|
||||
self.bits.push(prob | ((bit as u16) << 15));
|
||||
}
|
||||
}
|
||||
|
||||
impl RansCoder {
|
||||
pub fn new(config: &Config) -> RansCoder {
|
||||
pub fn new(use_bitstream: bool) -> RansCoder {
|
||||
RansCoder {
|
||||
bits: Vec::new(),
|
||||
use_bitstream: config.use_bitstream,
|
||||
bitstream_is_big_endian: config.bitstream_is_big_endian,
|
||||
invert_bit_encoding: config.invert_bit_encoding,
|
||||
use_bitstream,
|
||||
}
|
||||
}
|
||||
|
||||
@@ -44,31 +38,18 @@ impl RansCoder {
|
||||
let mut state = 1 << l_bits;
|
||||
|
||||
let mut byte = 0u8;
|
||||
let mut bit = if self.bitstream_is_big_endian { 0 } else { 8 };
|
||||
let mut bit = 0;
|
||||
let mut flush_state: Box<dyn FnMut(&mut u32)> = if self.use_bitstream {
|
||||
if self.bitstream_is_big_endian {
|
||||
Box::new(|state: &mut u32| {
|
||||
byte |= ((*state & 1) as u8) << bit;
|
||||
bit += 1;
|
||||
if bit == 8 {
|
||||
buffer.push(byte);
|
||||
byte = 0;
|
||||
bit = 0;
|
||||
}
|
||||
*state >>= 1;
|
||||
})
|
||||
} else {
|
||||
Box::new(|state: &mut u32| {
|
||||
bit -= 1;
|
||||
byte |= ((*state & 1) as u8) << bit;
|
||||
if bit == 0 {
|
||||
buffer.push(byte);
|
||||
byte = 0;
|
||||
bit = 8;
|
||||
}
|
||||
*state >>= 1;
|
||||
})
|
||||
}
|
||||
Box::new(|state: &mut u32| {
|
||||
byte |= ((*state & 1) as u8) << bit;
|
||||
bit += 1;
|
||||
if bit == 8 {
|
||||
buffer.push(byte);
|
||||
byte = 0;
|
||||
bit = 0;
|
||||
}
|
||||
*state >>= 1;
|
||||
})
|
||||
} else {
|
||||
Box::new(|state: &mut u32| {
|
||||
buffer.push(*state as u8);
|
||||
@@ -80,7 +61,7 @@ impl RansCoder {
|
||||
let max_state_factor: u32 = 1 << (l_bits + num_flush_bits - PROB_BITS);
|
||||
for step in self.bits.into_iter().rev() {
|
||||
let prob = step as u32 & 32767;
|
||||
let (start, prob) = if step & 32768 != 0 {
|
||||
let (start, prob) = if step & 32768 == 0 {
|
||||
(0, prob)
|
||||
} else {
|
||||
(prob, ONE_PROB - prob)
|
||||
@@ -110,11 +91,10 @@ impl RansCoder {
|
||||
pub struct CostCounter {
|
||||
cost: f64,
|
||||
log2_table: Vec<f64>,
|
||||
invert_bit_encoding: bool,
|
||||
}
|
||||
|
||||
impl CostCounter {
|
||||
pub fn new(config: &Config) -> CostCounter {
|
||||
pub fn new() -> CostCounter {
|
||||
let log2_table = (0..ONE_PROB)
|
||||
.map(|prob| {
|
||||
let inv_prob = ONE_PROB as f64 / prob as f64;
|
||||
@@ -124,7 +104,6 @@ impl CostCounter {
|
||||
CostCounter {
|
||||
cost: 0.0,
|
||||
log2_table,
|
||||
invert_bit_encoding: config.invert_bit_encoding,
|
||||
}
|
||||
}
|
||||
|
||||
@@ -139,7 +118,7 @@ impl CostCounter {
|
||||
|
||||
impl EntropyCoder for CostCounter {
|
||||
fn encode_bit(&mut self, bit: bool, prob: u16) {
|
||||
let prob = if bit ^ self.invert_bit_encoding {
|
||||
let prob = if !bit {
|
||||
prob as u32
|
||||
} else {
|
||||
ONE_PROB - prob as u32
|
||||
@@ -150,85 +129,60 @@ impl EntropyCoder for CostCounter {
|
||||
|
||||
pub struct RansDecoder<'a> {
|
||||
data: &'a [u8],
|
||||
pos: usize,
|
||||
state: u32,
|
||||
use_bitstream: bool,
|
||||
byte: u8,
|
||||
bits_left: u8,
|
||||
invert_bit_encoding: bool,
|
||||
bitstream_is_big_endian: bool,
|
||||
}
|
||||
|
||||
const PROB_MASK: u32 = ONE_PROB - 1;
|
||||
|
||||
#[derive(Debug, Error)]
|
||||
#[error("Unexpected end of input")]
|
||||
pub struct UnexpectedEOF;
|
||||
|
||||
impl<'a> RansDecoder<'a> {
|
||||
pub fn new(data: &'a [u8], config: &Config) -> RansDecoder<'a> {
|
||||
pub fn new(data: &'a [u8], use_bitstream: bool) -> RansDecoder<'a> {
|
||||
RansDecoder {
|
||||
data,
|
||||
pos: 0,
|
||||
state: 0,
|
||||
use_bitstream: config.use_bitstream,
|
||||
use_bitstream,
|
||||
byte: 0,
|
||||
bits_left: 0,
|
||||
invert_bit_encoding: config.invert_bit_encoding,
|
||||
bitstream_is_big_endian: config.bitstream_is_big_endian,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn pos(&self) -> usize {
|
||||
self.pos
|
||||
}
|
||||
|
||||
pub fn decode_with_context(&mut self, context: &mut Context) -> Result<bool, UnexpectedEOF> {
|
||||
let bit = self.decode_bit(context.prob())?;
|
||||
pub fn decode_with_context(&mut self, context: &mut Context) -> bool {
|
||||
let bit = self.decode_bit(context.prob());
|
||||
context.update(bit);
|
||||
Ok(bit)
|
||||
bit
|
||||
}
|
||||
|
||||
pub fn decode_bit(&mut self, prob: u16) -> Result<bool, UnexpectedEOF> {
|
||||
pub fn decode_bit(&mut self, prob: u16) -> bool {
|
||||
let prob = prob as u32;
|
||||
if self.use_bitstream {
|
||||
while self.state < 32768 {
|
||||
if self.bits_left == 0 {
|
||||
if self.pos >= self.data.len() {
|
||||
return Err(UnexpectedEOF);
|
||||
}
|
||||
self.byte = self.data[self.pos];
|
||||
self.pos += 1;
|
||||
self.byte = self.data[0];
|
||||
self.data = &self.data[1..];
|
||||
self.bits_left = 8;
|
||||
}
|
||||
if self.bitstream_is_big_endian {
|
||||
self.state = (self.state << 1) | (self.byte >> 7) as u32;
|
||||
self.byte <<= 1;
|
||||
} else {
|
||||
self.state = (self.state << 1) | (self.byte & 1) as u32;
|
||||
self.byte >>= 1;
|
||||
}
|
||||
self.state = (self.state << 1) | (self.byte >> 7) as u32;
|
||||
self.byte <<= 1;
|
||||
self.bits_left -= 1;
|
||||
}
|
||||
} else {
|
||||
while self.state < 4096 {
|
||||
if self.pos >= self.data.len() {
|
||||
return Err(UnexpectedEOF);
|
||||
}
|
||||
self.state = (self.state << 8) | self.data[self.pos] as u32;
|
||||
self.pos += 1;
|
||||
self.state = (self.state << 8) | self.data[0] as u32;
|
||||
self.data = &self.data[1..];
|
||||
}
|
||||
}
|
||||
|
||||
let bit = (self.state & PROB_MASK) < prob;
|
||||
let bit = (self.state & PROB_MASK) >= prob;
|
||||
|
||||
let (start, prob) = if bit {
|
||||
(0, prob)
|
||||
} else {
|
||||
(prob, ONE_PROB - prob)
|
||||
} else {
|
||||
(0, prob)
|
||||
};
|
||||
self.state = prob * (self.state >> PROB_BITS) + (self.state & PROB_MASK) - start;
|
||||
|
||||
Ok(bit ^ self.invert_bit_encoding)
|
||||
bit
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user