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build macro ZSTD_DECODER_INTERNAL_BUFFER

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just to make the topic more accessible for potential users.
This commit is contained in:
Yann Collet 2021-10-25 08:09:04 -07:00
parent 6a7ede3dfc
commit 02be2a830f
2 changed files with 12 additions and 7 deletions
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10
lib/README.md
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@ -155,11 +155,11 @@ The file structure is designed to make this selection manually achievable for an
- The build macro `ZSTD_NO_INTRINSICS` can be defined to disable all explicit intrinsics.
Compiler builtins are still used.
- The build macro `ZSTD_LITBUFFEREXTRASIZE` can be set to control the amount of extra memory used
during decompression to store literals. This defaults to 64kB. Reducing it can reduce the
memory footprint required for decompression by increasing the portion of the literal buffer that
is stored in the unwritten portion of the dst buffer, at the cost of performance impact for
decompression.
- The build macro `ZSTD_DECODER_INTERNAL_BUFFER` can be set to control
the amount of extra memory used during decompression to store literals.
This defaults to 64kB. Reducing this value reduces the memory footprint of
`ZSTD_DCtx` decompression contexts,
but might also result in a small decompression speed cost.
#### Windows : using MinGW+MSYS to create DLL

9
lib/decompress/zstd_decompress_internal.h
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@ -106,10 +106,15 @@ typedef struct {
size_t ddictPtrCount;
} ZSTD_DDictHashSet;
#ifndef ZSTD_LITBUFFEREXTRASIZE
#define ZSTD_LITBUFFEREXTRASIZE (1 << 16) /* extra buffer reduces amount of dst required to store litBuffer */
#ifndef ZSTD_DECODER_INTERNAL_BUFFER
# define ZSTD_DECODER_INTERNAL_BUFFER (1 << 16)
#endif
#define ZSTD_LBMAX (128 << 10)
/* extra buffer, compensates amount of dst required to store litBuffer */
#define ZSTD_LITBUFFEREXTRASIZE MIN(ZSTD_DECODER_INTERNAL_BUFFER, ZSTD_LBMAX)
typedef enum {
ZSTD_not_in_dst = 0, /* Stored entirely within litExtraBuffer */
ZSTD_in_dst = 1, /* Stored entirely within dst (in memory after current output write) */