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Code Issues Releases 1 Activity

created ZSTD_compressContinueThenEnd()

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This commit is contained in:
Yann Collet 2016-07-28 01:17:22 +02:00
parent c991cc1828
commit 5b56739b63
2 changed files with 20 additions and 6 deletions
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17
lib/compress/zstd_compress.c
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@ -2393,11 +2393,24 @@ static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* zc,
}
size_t ZSTD_compressContinue (ZSTD_CCtx* zc,
size_t ZSTD_compressContinue (ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize)
{
return ZSTD_compressContinue_internal(zc, dst, dstCapacity, src, srcSize, 1, 0);
return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1, 0);
}
size_t ZSTD_compressContinueThenEnd (ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize)
{
size_t endResult;
size_t const cSize = ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1, 1);
if (ZSTD_isError(cSize)) return cSize;
endResult = ZSTD_compressEnd(cctx, (char*)dst + cSize, dstCapacity-cSize);
if (ZSTD_isError(endResult)) return endResult;
return cSize + endResult;
}

9
lib/zstd.h
View File

@ -319,6 +319,7 @@ ZSTDLIB_API size_t ZSTD_copyCCtx(ZSTD_CCtx* cctx, const ZSTD_CCtx* preparedCCtx)
ZSTDLIB_API size_t ZSTD_compressContinue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
ZSTDLIB_API size_t ZSTD_compressEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity);
ZSTDLIB_API size_t ZSTD_compressContinueThenEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
/*
A ZSTD_CCtx object is required to track streaming operations.
@ -342,9 +343,9 @@ ZSTDLIB_API size_t ZSTD_compressEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapaci
- ZSTD_compressContinue() detects that prior input has been overwritten when `src` buffer overlaps.
In which case, it will "discard" the relevant memory section from its history.
Finish a frame with ZSTD_compressEnd(), which will write the epilogue.
Without epilogue, frames will be considered unfinished (broken) by decoders.
Finish a frame with ZSTD_compressEnd(), which will write the epilogue,
or ZSTD_compressContinueThenEnd(), which will write the last block.
Without last block / epilogue mark, frames will be considered unfinished (broken) by decoders.
You can then reuse `ZSTD_CCtx` (ZSTD_compressBegin()) to compress some new frame.
*/
@ -407,7 +408,7 @@ ZSTDLIB_API size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t ds
== Special case : skippable frames ==
Skippable frames allow the integration of user-defined data into a flow of concatenated frames.
Skippable frames will be ignored (skipped) by a decompressor. The format of skippable frame is following:
Skippable frames will be ignored (skipped) by a decompressor. The format of skippable frames is as follows :
a) Skippable frame ID - 4 Bytes, Little endian format, any value from 0x184D2A50 to 0x184D2A5F
b) Frame Size - 4 Bytes, Little endian format, unsigned 32-bits
c) Frame Content - any content (User Data) of length equal to Frame Size