Martin Vogel
7814dacf15
Two loose ends from the bounds work. The decompression side already took size_t so a >2 GiB capacity could not wrap through int, but compression still took int for both the source length and the destination capacity, and the artifact export cast a size_t database size down to reach it. A database past 2 GiB would have handed the encoder a negative length. Both lengths and the bound helper are size_t now, and the function returns int64_t like its decompressing counterpart. The discovery walk now prunes the cache directory by absolute path. A custom CBM_CACHE_DIR may sit inside a repository — tests do it routinely — and walking into it pulls every other project's graph database into this project's file list. This is the narrow form of a concern that was briefly implemented as refusing any root that contained the cache; refusing a whole root was too blunt, and not walking the cache is what the concern actually asks for. The test fails without the prune: a .go file planted under the cache is otherwise discovered, and "cache" is not in the built-in skip list, so the assertion is not vacuous. Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>
37 lines
971 B
C
37 lines
971 B
C
// zstd_store.c — Thin C wrappers around Zstandard.
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#include "vendored/zstd/zstd.h"
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#include "zstd_store.h"
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#include <stddef.h>
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#include <stdint.h>
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int64_t cbm_zstd_compress(const char *src, size_t srcLen, char *dst, size_t dstCap, int level) {
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size_t rc = ZSTD_compress(dst, dstCap, src, srcLen, level);
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if (ZSTD_isError(rc)) {
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return 0;
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}
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return (int64_t)rc;
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}
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int64_t cbm_zstd_decompress(const char *src, size_t srcLen, char *dst, size_t dstCap) {
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size_t rc = ZSTD_decompress(dst, dstCap, src, srcLen);
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if (ZSTD_isError(rc)) {
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return 0;
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}
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return (int64_t)rc;
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}
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size_t cbm_zstd_frame_content_size(const char *src, size_t srcLen) {
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unsigned long long n = ZSTD_getFrameContentSize(src, srcLen);
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if (n == ZSTD_CONTENTSIZE_UNKNOWN || n == ZSTD_CONTENTSIZE_ERROR) {
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return 0;
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}
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return (size_t)n;
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}
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size_t cbm_zstd_compress_bound(size_t inputSize) {
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return ZSTD_compressBound(inputSize);
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}
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