libzl4: 1.7.4 to 1.7.5 compatibility report

Test Info

Library Name	libzl4
Version #1	1.7.4
Version #2	1.7.5
Arch	x86_64
GCC Version	6.3.1
Subject	Binary Compatibility

Test Results

Total Header Files	3
Total Shared Libraries	1
Total Symbols / Types	77 / 64
Compatibility	94.8%

Problem Summary

	Severity	Count
Added Symbols	-	1
Removed Symbols	High	0
Problems with Data Types	High	0
	Medium	4
	Low	2
Problems with Symbols	High	0
	Medium	0
	Low	1
Problems with Constants	Low	6
Other Changes in Constants	-	5

Added Symbols 1

lz4.h, liblz4.so.1.7.5
LZ4_versionString ( )

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Problems with Data Types, Medium Severity 4

	Change	Effect
1	Field searchNum has been added at the middle position of this structural type.	1) Size of the inclusive type has been changed. 2) Layout of structure fields has been changed and therefore fields at higher positions of the structure definition may be incorrectly accessed by applications.
2	Type of field chainTable has been changed from uint16_t[65536] (131072 bytes) to uint16_t[131072] (262144 bytes).	1) Size of the inclusive type has been changed. 2) Previous accesses of applications and library functions to this field and fields at higher positions of the structure definition may be broken.

	Change	Effect
1	Size of field internal_donotuse has been changed from 262192 bytes to 393272 bytes.	1) Size of the inclusive type has been changed. 2) Previous accesses of applications and library functions to this field may be broken.
2	Type of field table has been changed from size_t[32774] (262192 bytes) to size_t[49159] (393272 bytes).	1) This field may be incorrectly initialized or accessed by applications. 2) Size of the inclusive type has been changed.

lz4hc.h
[+] struct LZ4HC_CCtx_internal 2
[+] union LZ4_streamHC_u 2

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Problems with Data Types, Low Severity 2

	Change	Effect
1	Size of this type has been changed from 262192 bytes to 393272 bytes.	The fields or parameters of such data type may be incorrectly initialized or accessed by old client applications.

	Change	Effect
1	Size of this type has been changed from 262192 bytes to 393272 bytes.	The fields or parameters of such data type may be incorrectly initialized or accessed by old client applications.

lz4hc.h
[+] struct LZ4HC_CCtx_internal 1
[+] union LZ4_streamHC_u 1

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Problems with Symbols, Low Severity 1

	Change	Effect
1	3rd parameter dstMaxSize has been renamed to dstCapacity.	Renaming of a parameter may indicate a change in its semantic meaning.

lz4frame.h, liblz4.so.1.7.4
[+] LZ4F_compressEnd ( LZ4F_cctx* cctx, void* dstBuffer, size_t dstMaxSize, struct LZ4F_compressOptions_t const* cOptPtr ) 1

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Problems with Constants, Low Severity 6

	Change	Effect
1	The value of constant LZ4_STREAMHCSIZE has been changed from 262192 to (4LZ4HC_HASHTABLESIZE + 2LZ4HC_MAXD + 56).	Applications will pass an old value of this constant as the parameter to the new-version library functions, that expect a new one. This may result in crash of incorrect behavior of applications.

	Change	Effect
1	The constant LZ4HC_DEFAULT_CLEVEL with value 9 has been removed.	The value of this constant may no longer be properly handled by new-version library functions.

	Change	Effect
1	The value of constant LZ4HC_DICTIONARY_LOGSIZE has been changed from 16 to 17.	Applications will pass an old value of this constant as the parameter to the new-version library functions, that expect a new one. This may result in crash of incorrect behavior of applications.

	Change	Effect
1	The value of constant LZ4HC_HASH_LOG has been changed from (LZ4HC_DICTIONARY_LOGSIZE-1) to 15.	Applications will pass an old value of this constant as the parameter to the new-version library functions, that expect a new one. This may result in crash of incorrect behavior of applications.

	Change	Effect
1	The constant LZ4HC_MAX_CLEVEL with value 16 has been removed.	The value of this constant may no longer be properly handled by new-version library functions.

	Change	Effect
1	The constant LZ4HC_MIN_CLEVEL with value 3 has been removed.	The value of this constant may no longer be properly handled by new-version library functions.

lz4hc.h
[+] LZ4_STREAMHCSIZE
[+] LZ4HC_DEFAULT_CLEVEL
[+] LZ4HC_DICTIONARY_LOGSIZE
[+] LZ4HC_HASH_LOG
[+] LZ4HC_MAX_CLEVEL
[+] LZ4HC_MIN_CLEVEL

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Other Changes in Constants 5

	Change	Effect
1	The constant LZ4F_HEADER_SIZE_MAX with value 15 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_DEFAULT with value 9 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_MAX with value 12 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_MIN with value 3 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_OPT_MIN with value 11 has been added.	No effect.

lz4frame.h
[+] LZ4F_HEADER_SIZE_MAX

lz4hc.h
[+] LZ4HC_CLEVEL_DEFAULT
[+] LZ4HC_CLEVEL_MAX
[+] LZ4HC_CLEVEL_MIN
[+] LZ4HC_CLEVEL_OPT_MIN

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Header Files 3

lz4.h
lz4frame.h
lz4hc.h

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Shared Libraries 1

liblz4.so.1.7.4

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Test Info

Library Name	libzl4
Version #1	1.7.4
Version #2	1.7.5
Arch	x86_64
Subject	Source Compatibility

Test Results

Total Header Files	3
Total Shared Libraries	1
Total Symbols / Types	78 / 64
Compatibility	100%

Problem Summary

	Severity	Count
Added Symbols	-	0
Removed Symbols	High	0
Problems with Data Types	High	0
	Medium	0
	Low	3
Problems with Symbols	High	0
	Medium	0
	Low	0
Problems with Constants	Low	7
Other Changes in Symbols	-	1
Other Changes in Constants	-	5

Problems with Data Types, Low Severity 3

	Change	Effect
1	Field searchNum has been added to this type.	This field will not be initialized or used by old client applications.
2	Type of field chainTable has been changed from uint16_t[65536] to uint16_t[131072].	Recompilation of a client program may be broken.

	Change	Effect
1	Type of field table has been changed from size_t[32774] to size_t[49159].	Recompilation of a client program may be broken.

lz4hc.h
[+] struct LZ4HC_CCtx_internal 2
[+] union LZ4_streamHC_u 1

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Problems with Constants, Low Severity 7

	Change	Effect
1	The value of constant LZ4_VERSION_RELEASE has been changed from 4 to 5.	Recompilation of a client program may be broken.

	Change	Effect
1	The value of constant LZ4_STREAMHCSIZE has been changed from 262192 to (4LZ4HC_HASHTABLESIZE + 2LZ4HC_MAXD + 56).	Recompilation of a client program may be broken.

	Change	Effect
1	The constant LZ4HC_DEFAULT_CLEVEL with value 9 has been removed.	Recompilation of a client program may be broken.

	Change	Effect
1	The value of constant LZ4HC_DICTIONARY_LOGSIZE has been changed from 16 to 17.	Recompilation of a client program may be broken.

	Change	Effect
1	The value of constant LZ4HC_HASH_LOG has been changed from (LZ4HC_DICTIONARY_LOGSIZE-1) to 15.	Recompilation of a client program may be broken.

	Change	Effect
1	The constant LZ4HC_MAX_CLEVEL with value 16 has been removed.	Recompilation of a client program may be broken.

	Change	Effect
1	The constant LZ4HC_MIN_CLEVEL with value 3 has been removed.	Recompilation of a client program may be broken.

lz4.h
[+] LZ4_VERSION_RELEASE

lz4hc.h
[+] LZ4_STREAMHCSIZE
[+] LZ4HC_DEFAULT_CLEVEL
[+] LZ4HC_DICTIONARY_LOGSIZE
[+] LZ4HC_HASH_LOG
[+] LZ4HC_MAX_CLEVEL
[+] LZ4HC_MIN_CLEVEL

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Other Changes in Symbols 1

	Change	Effect
1	3rd parameter dstMaxSize has been renamed to dstCapacity.	No effect.

lz4frame.h
[+] LZ4F_compressEnd ( LZ4F_cctx* cctx, void* dstBuffer, size_t dstMaxSize, struct LZ4F_compressOptions_t const* cOptPtr ) 1

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Other Changes in Constants 5

	Change	Effect
1	The constant LZ4F_HEADER_SIZE_MAX with value 15 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_DEFAULT with value 9 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_MAX with value 12 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_MIN with value 3 has been added.	No effect.

	Change	Effect
1	The constant LZ4HC_CLEVEL_OPT_MIN with value 11 has been added.	No effect.

lz4frame.h
[+] LZ4F_HEADER_SIZE_MAX

lz4hc.h
[+] LZ4HC_CLEVEL_DEFAULT
[+] LZ4HC_CLEVEL_MAX
[+] LZ4HC_CLEVEL_MIN
[+] LZ4HC_CLEVEL_OPT_MIN

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Header Files 3

lz4.h
lz4frame.h
lz4hc.h

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Shared Libraries 1

liblz4.so.1.7.4

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API compatibility report for the libzl4 library between 1.7.4 and 1.7.5 versions on x86_64

Test Info

Test Results

Problem Summary

Added Symbols 1

Problems with Data Types, Medium Severity 4

Problems with Data Types, Low Severity 2

Problems with Symbols, Low Severity 1

Problems with Constants, Low Severity 6

Other Changes in Constants 5

Header Files 3

Shared Libraries 1

Test Info

Test Results

Problem Summary

Problems with Data Types, Low Severity 3

Problems with Constants, Low Severity 7

Other Changes in Symbols 1

Other Changes in Constants 5

Header Files 3

Shared Libraries 1