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Add leb128 library

This commit is contained in:
retropikzel 2026-02-26 07:43:14 +02:00
parent e48bc05a60
commit 7077044530
9 changed files with 402 additions and 25 deletions
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9
.gitignore vendored
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@ -13,4 +13,13 @@ run-test*
Akku.*
srfi
snow
*.wasm
*.js
*.a
*.o
*.so
*.import.*
*.link
core.*
venv*

6
Dockerfile.test
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@ -27,7 +27,7 @@ ARG SCHEME=chibi
FROM docker.io/schemers/${IMAGE}
COPY --from=build /build /build
RUN apt-get update && apt-get install -y make curl
RUN apt-get update && apt-get install -y make curl libcurl4-openssl-dev emscripten
WORKDIR /build/chibi-scheme
RUN make install
WORKDIR /build/akku
@ -42,6 +42,10 @@ RUN mkdir -p /root/.snow && echo "()" > /root/.snow/config.scm
WORKDIR /workdir
ARG SCHEME=chibi
ENV COMPILE_R7RS=${SCHEME}
RUN snow-chibi install --impls=${SCHEME} --always-yes srfi.64
RUN snow-chibi install --impls=${SCHEME} --always-yes retropikzel.mouth
RUN snow-chibi install --impls=${SCHEME} --always-yes retropikzel.ctrf
COPY Makefile .
COPY retropikzel retropikzel/
RUN make retropikzel/wasm/plus.wasm

58
Makefile
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@ -1,6 +1,7 @@
SCHEME=chibi
RNRS=r7rs
LIBRARY=ctrf
VENV=venv-${SCHEME}-${RNRS}-${LIBRARY}
AUTHOR=retropikzel
LIBRARY_FILE=retropikzel/${LIBRARY}.sld
@ -29,30 +30,35 @@ install:
uninstall:
-snow-chibi remove --impls=${SCHEME} ${PKG}
run-test-venv: build
rm -rf venv
scheme-venv ${SCHEME} ${RNRS} venv
echo "(import (scheme base) (scheme write) (scheme read) (scheme char) (scheme file) (scheme process-context) (retropikzel mouth) (srfi 64) (retropikzel ctrf) (retropikzel ${LIBRARY}))" > venv/test.scm
echo "(test-runner-current (ctrf-runner))" >> venv/test.scm
printf "#!r6rs\n(import (rnrs) (srfi :64) (srfi :98) (retropikzel mouth) (retropikzel ${LIBRARY}))" > venv/test.sps
cat ${TESTFILE} >> venv/test.scm
cat ${TESTFILE} >> venv/test.sps
if [ "${RNRS}" = "r7rs" ]; then ./venv/bin/snow-chibi install --always-yes srfi.64; fi
if [ "${RNRS}" = "r7rs" ]; then ./venv/bin/snow-chibi install retropikzel.mouth; fi
if [ "${RNRS}" = "r7rs" ]; then printf "1\n1\n" | ./venv/bin/snow-chibi install retropikzel.ctrf; fi
if [ "${RNRS}" = "r6rs" ]; then cp -r retropikzel venv/lib/; fi
if [ "${SCHEME}" = "chezscheme" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
if [ "${SCHEME}" = "ikarus" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
if [ "${SCHEME}" = "ironscheme" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
if [ "${SCHEME}" = "racket" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
if [ "${RNRS}" = "r6rs" ]; then ./venv/bin/akku install; fi
if [ "${SCHEME}-${RNRS}" = "mosh-r7rs" ]; then ./venv/bin/snow-chibi install --always-yes srfi.64; fi
if [ "${RNRS}" = "r7rs" ]; then ./venv/bin/snow-chibi install ${PKG}; fi
if [ "${RNRS}" = "r6rs" ]; then ./venv/bin/scheme-compile venv/test.sps; fi
if [ "${RNRS}" = "r7rs" ]; then CSC_OPTIONS="-L -lcurl" ./venv/bin/scheme-compile venv/test.scm; fi
./venv/test
logs:
mkdir -p logs
run-test-system: build
${VENV}:
scheme-venv ${SCHEME} ${RNRS} ${VENV}
if [ "${RNRS}" = "r7rs" ]; then ${VENV}/bin/snow-chibi install --always-yes srfi.64; fi
if [ "${RNRS}" = "r7rs" ]; then ${VENV}/bin/snow-chibi install retropikzel.mouth; fi
if [ "${RNRS}" = "r7rs" ]; then ${VENV}/bin/snow-chibi install --always-yes retropikzel.ctrf; fi
if [ "${SCHEME}-${RNRS}" = "mosh-r7rs" ]; then ${VENV}/bin/snow-chibi install --always-yes srfi.64; fi
if [ "${SCHEME}" = "chezscheme" ]; then ${VENV}/bin/akku install akku-r7rs chez-srfi; fi
if [ "${SCHEME}" = "ikarus" ]; then ${VENV}/bin/akku install akku-r7rs chez-srfi; fi
if [ "${SCHEME}" = "ironscheme" ]; then ${VENV}/bin/akku install akku-r7rs chez-srfi; fi
if [ "${SCHEME}" = "racket" ]; then ${VENV}/bin/akku install akku-r7rs chez-srfi; fi
run-test-venv: ${VENV} logs build
echo "(import (scheme base) (scheme write) (scheme read) (scheme char) (scheme file) (scheme process-context) (retropikzel mouth) (srfi 64) (retropikzel ctrf) (retropikzel ${LIBRARY}))" > ${VENV}/test.scm
echo "(test-runner-current (ctrf-runner))" >> ${VENV}/test.scm
printf "#!r6rs\n(import (rnrs) (srfi :64) (srfi :98) (retropikzel mouth) (retropikzel ${LIBRARY}))" > ${VENV}/test.sps
cat ${TESTFILE} >> ${VENV}/test.scm
cat ${TESTFILE} >> ${VENV}/test.sps
if [ "${RNRS}" = "r6rs" ]; then cp -r retropikzel ${VENV}/lib/; fi
if [ "${RNRS}" = "r6rs" ]; then ${VENV}/bin/akku install; fi
if [ "${RNRS}" = "r7rs" ]; then ${VENV}/bin/snow-chibi install ${PKG}; fi
if [ "${RNRS}" = "r6rs" ]; then ${VENV}/bin/scheme-compile ${VENV}/test.sps; fi
if [ "${RNRS}" = "r7rs" ]; then CSC_OPTIONS="-L -lcurl" ${VENV}/bin/scheme-compile ${VENV}/test.scm; fi
cd ${VENV} && ./test
mv ${VENV}/*.json logs/ || true
run-test-system: logs build
printf "#!r6rs\n(import (rnrs) (srfi :64) (srfi :98) (retropikzel mouth) (retropikzel ctrf) (retropikzel ${LIBRARY}))" > run-test.sps
echo "(test-runner-current (ctrf-runner))" >> run-test.sps
cat ${TESTFILE} >> run-test.sps
@ -73,10 +79,14 @@ run-test-system: build
if [ "${RNRS}" = "r6rs" ]; then COMPILE_R7RS=${SCHEME} compile-scheme -I .akku/lib run-test.sps; fi
if [ "${RNRS}" = "r7rs" ]; then COMPILE_R7RS=${SCHEME} CSC_OPTIONS="-L -lcurl" compile-scheme run-test.scm; fi
./run-test
mv *.json logs/ || true
run-test-docker:
docker build --build-arg IMAGE=${DOCKERIMG} -f Dockerfile.test --tag=scheme-libraries-${SCHEME}-${RNRS} .
docker run -v "${PWD}:/workdir" -w /workdir scheme-libraries-${SCHEME}-${RNRS} sh -c "make SCHEME=${SCHEME} RNRS=${RNRS} LIBRARY=${LIBRARY} run-test-system ; chmod 755 *.json || true"
docker run -v "${PWD}/logs:/workdir/logs" -w /workdir scheme-libraries-${SCHEME}-${RNRS} sh -c "make SCHEME=${SCHEME} RNRS=${RNRS} LIBRARY=${LIBRARY} run-test-system"
retropikzel/wasm/plus.wasm: retropikzel/wasm/plus.c
emcc -o retropikzel/wasm/plus.js retropikzel/wasm/plus.c
clean:
git clean -X -f

113
retropikzel/leb128.scm Normal file
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@ -0,0 +1,113 @@
(define (integer->leb128 value)
(when (not (exact-integer? value))
(error "integer->leb128: value must be exact integer" value))
(letrec*
((more 1)
(byte #f)
(sign-bit #f)
(bytes (bytevector))
(negative-at-start? (negative? value))
(looper
(lambda ()
(set! byte (bitwise-and value #x7f))
(set! value (arithmetic-shift value -7))
(set! sign-bit (bitwise-and byte #x40))
(if (or (and (= value 0) (= sign-bit 0))
(and (= value -1) (not (= sign-bit 0))))
(set! more 0)
(set! byte (bitwise-ior byte #x80)))
(set! bytes (bytevector-append bytes (bytevector byte)))
(when (not (= more 0)) (looper)))))
(looper)
bytes))
(define (leb128->integer-and-length bytes . start-index)
(when (not (bytevector? bytes))
(error "leb128->integer-and-lenght: bytes must be bytevector" bytes))
(when (and (not (null? start-index))
(not (exact-integer? (car start-index))))
(error "leb128->integer-and-length: start-index must be exact integer"
(car start-index)))
(letrec*
((result 0)
(shift 0)
(byte #f)
(index (if (null? start-index) 0 (car start-index)))
(looper
(lambda ()
(set! byte (bytevector-u8-ref bytes index))
(set! result (+ result (arithmetic-shift (bitwise-and byte #x7f) shift)))
(when (not (= (bitwise-and byte #x80) 0))
(set! shift (+ shift 7))
(set! index (+ index 1))
(looper)))))
(looper)
(cons
(if (not (= (bitwise-and byte #x40) 0))
(bitwise-ior result (* (arithmetic-shift 1 (+ shift 7)) -1))
result)
(+ index 1))))
(define (leb128->integer bytes . start-index)
(when (not (bytevector? bytes))
(error "leb128->integer: bytes must be bytevector" bytes))
(when (and (not (null? start-index))
(not (exact-integer? (car start-index))))
(error "leb128->integer: start-index must be exact integer"
(car start-index)))
(car (leb128->integer-and-length bytes
(if (null? start-index)
0
(car start-index)))))
(define (integer->uleb128 value)
(when (not (exact-integer? value)) (error "integer->uleb128: value must be exact integer" value))
(when (and (not (positive? value))
(not (zero? value)))
(error "integer->uleb128: value must be unsigned integer" value))
(letrec*
((byte #f)
(bytes (bytevector))
(looper
(lambda ()
(set! byte (bitwise-and value #x7f))
(set! value (arithmetic-shift value -7))
(when (not (= value 0)) (set! byte (bitwise-ior byte #x80)))
(set! bytes (bytevector-append bytes (bytevector byte)))
(if (not (= value 0)) (looper)))))
(looper)
bytes))
(define (uleb128->integer-and-length bytes . start-index)
(when (not (bytevector? bytes))
(error "uleb128->integer-and-length: bytes must be bytevector" bytes))
(when (and (not (null? start-index))
(not (exact-integer? (car start-index))))
(error "uleb128->integer-and-lenght: start-index must be exact integer"
(car start-index)))
(letrec*
((uleb-bytes-count 1)
(index (if (null? start-index) 0 (car start-index)))
(byte (bytevector-u8-ref bytes index))
(shift 0)
(result (arithmetic-shift (bitwise-and byte #x7f) shift))
(looper
(lambda ()
(cond
((= (bitwise-and byte #x80) 0) (cons result uleb-bytes-count))
(else
(set! uleb-bytes-count (+ uleb-bytes-count 1))
(set! index (+ index 1))
(set! byte (bytevector-u8-ref bytes index))
(set! result (bitwise-ior result (arithmetic-shift (bitwise-and byte #x7f) shift)))
(set! shift (+ shift 7))
(looper))))))
(set! shift (+ shift 7))
(looper)))
(define (uleb128->integer bytes . start-index)
(when (not (bytevector? bytes)) (error "uleb128->integer: bytes must be bytevector" bytes))
(when (and (not (null? start-index))
(not (exact-integer? (car start-index))))
(error "uleb128->integer: start-index must be exact integer" (car start-index)))
(car (uleb128->integer-and-length bytes (if (null? start-index) 0 (car start-index)))))

12
retropikzel/leb128.sld Normal file
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@ -0,0 +1,12 @@
(define-library
(retropikzel leb128)
(import (scheme base)
(scheme write)
(srfi 60))
(export integer->leb128
leb128->integer
leb128->integer-and-length
integer->uleb128
uleb128->integer
uleb128->integer-and-length)
(include "leb128.scm"))

165
retropikzel/leb128/LICENSE Normal file
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@ -0,0 +1,165 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
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a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
function or data, the facility still operates, and performs
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3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from
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You may place library facilities that are a work based on the
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is a work based on the Library, and explaining where to find the
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6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
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8
retropikzel/leb128/README.md Normal file
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@ -0,0 +1,8 @@
LEB128 or Little Endian Base 128 is a variable-length code compression used to store arbitrarily large integers in a small number of bytes.
Resources used:
https://en.wikipedia.org/wiki/LEB128
- Mostly turning pseudocode from here to Scheme
https://github.com/mohanson/leb128
- Code for leb128 to integer handling as we dont know integer size like in C

1
retropikzel/leb128/VERSION Normal file
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@ -0,0 +1 @@
0.1.0

55
retropikzel/leb128/test.scm Normal file
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@ -0,0 +1,55 @@
(test-begin "leb128")
;; Cant use #u8(...) or #vu8(...) because tests need to work on both R6RS and R7RS
(define bv-42 (let ((bv (make-bytevector 1))) (bytevector-u8-set! bv 0 #x2A) bv))
(define bv-minus-42 (let ((bv (make-bytevector 1))) (bytevector-u8-set! bv 0 #x56) bv))
(define bv-123456
(let ((bv (make-bytevector 3)))
(bytevector-u8-set! bv 0 #xC0)
(bytevector-u8-set! bv 1 #xC4)
(bytevector-u8-set! bv 2 #x07)
bv))
(define bv-minus-123456
(let ((bv (make-bytevector 3)))
(bytevector-u8-set! bv 0 #xC0)
(bytevector-u8-set! bv 1 #xBB)
(bytevector-u8-set! bv 2 #x78)
bv))
(test-begin "integer->leb128")
(test-equal bv-42 (integer->leb128 42))
(test-equal bv-minus-42 (integer->leb128 -42))
(test-equal bv-123456 (integer->leb128 123456))
(test-equal bv-minus-123456 (integer->leb128 -123456))
(test-end "integer->leb128")
(test-begin "leb128->integer")
(test-equal 42 (leb128->integer (integer->leb128 42)))
(test-equal 123456 (leb128->integer (integer->leb128 123456)))
(test-equal -42 (leb128->integer (integer->leb128 -42)))
(test-equal -123456 (leb128->integer (integer->leb128 -123456)))
(test-end "leb128->integer")
(test-begin "leb128->integer-and-length")
(test-equal 123456 (car (leb128->integer-and-length bv-123456)))
(test-equal 3 (cdr (leb128->integer-and-length bv-123456)))
(test-equal -123456 (car (leb128->integer-and-length bv-minus-123456)))
(test-equal 3 (cdr (leb128->integer-and-length bv-minus-123456)))
(test-end "leb128->integer-and-length")
(test-begin "integer->uleb128")
(test-equal bv-42 (integer->uleb128 42))
(test-equal bv-123456 (integer->uleb128 123456))
(test-end "integer->uleb128")
(test-begin "uleb128->integer")
(test-equal 42 (uleb128->integer (integer->uleb128 42)))
(test-equal 123456 (uleb128->integer (integer->uleb128 123456)))
(test-end "uleb128->integer")
(test-begin "uleb128->integer-and-length")
(test-equal 123456 (car (uleb128->integer-and-length bv-123456)))
(test-equal 3 (cdr (uleb128->integer-and-length bv-123456)))
(test-end "uleb128->integer-and-length")
(test-end "leb128")