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Fix Zstd decompression negative size issue on 32-bit platforms (Fixes #781) #782

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Merged
d-v-b merged 5 commits into from
Aug 19, 2025
Merged

Fix Zstd decompression negative size issue on 32-bit platforms (Fixes #781) #782

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41150f2
Update zstd.pyx with new content
mkitti Aug 18, 2025
10a01d7
Merge branch 'main' into zstd-frame-content-size-ull
mkitti Aug 18, 2025
b0fe556
Apply suggestion from @mkitti
mkitti Aug 18, 2025
1349304
Fix LLM issues ..
Aug 18, 2025
786d31f
Add pass, comment for dest_size
Aug 18, 2025
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25 changes: 17 additions & 8 deletions numcodecs/zstd.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,9 @@ from .abc import Codec

from libc.stdlib cimport malloc, realloc, free

cdef extern from "stdint.h":
cdef size_t SIZE_MAX

cdef extern from "zstd.h":

unsigned ZSTD_versionNumber() nogil
Expand Down Expand Up @@ -202,8 +205,8 @@ def decompress(source, dest=None):
Py_buffer* dest_pb
char* dest_ptr
size_t source_size, dest_size, decompressed_size
size_t nbytes, cbytes, blocksize
size_t dest_nbytes
unsigned long long content_size

# obtain source memoryview
source_mv = ensure_continguous_memoryview(source)
Expand All @@ -214,14 +217,20 @@ def decompress(source, dest=None):
source_size = source_pb.len

try:

# determine uncompressed size
dest_size = ZSTD_getFrameContentSize(source_ptr, source_size)
if dest_size == 0 or dest_size == ZSTD_CONTENTSIZE_ERROR:
# determine uncompressed size using unsigned long long for full range
content_size = ZSTD_getFrameContentSize(source_ptr, source_size)
if content_size == ZSTD_CONTENTSIZE_UNKNOWN and dest is None:
return stream_decompress(source_pb)
elif content_size == ZSTD_CONTENTSIZE_UNKNOWN:
# dest is not None
# set dest_size based on dest
pass
elif content_size == ZSTD_CONTENTSIZE_ERROR or content_size == 0:
raise RuntimeError('Zstd decompression error: invalid input data')
elif content_size > (<unsigned long long>SIZE_MAX):
raise RuntimeError('Zstd decompression error: content size too large for platform')

if dest_size == ZSTD_CONTENTSIZE_UNKNOWN and dest is None:
return stream_decompress(source_pb)
dest_size = <size_t>content_size

# setup destination buffer
if dest is None:
Expand All @@ -236,7 +245,7 @@ def decompress(source, dest=None):
dest_ptr = <char*>dest_pb.buf
dest_nbytes = dest_pb.len

if dest_size == ZSTD_CONTENTSIZE_UNKNOWN:
if content_size == ZSTD_CONTENTSIZE_UNKNOWN:
dest_size = dest_nbytes

# validate output buffer
Expand Down
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