Modify: CI Logging Utils

[xsscx]

Summary

IccSignatureUtils.h V2 addresses three issues:

1. Noisy debug output on valid profiles — ICC_LOG_DEBUG and ICC_LOG_WARNING calls fired unconditionally on every signature validation, producing spurious stderr output (e.g., ICC_WARN: ColorSpace signature: 0x6e630011 (Unknown) on valid 17-channel v5 profiles).

2. Missing v5/iccMAX dynamic signatures — N-channel (0x6e63xxxx) and MCS (0x6d63xxxx) signatures were not recognized, causing valid v5 profiles to be flagged as "Unknown".

3. Missing MCH A-F — icSigMCHAData through icSigMCHFData (10-15 channel profiles) were absent from both ColorSpaceSignatureToStr() and IsValidColorSpaceSignature().

Changes

Function	Change
ColorSpaceSignatureToStr()	Add MCH A-F cases + N-channel/MCS fallback returning "NChannel" / "MCS"
IsValidColorSpaceSignature()	Add MCH A-F cases + N-channel/MCS dynamic pattern. Gate logging behind #ifdef ICC_SIGNATURE_VERBOSE
IsValidTechnologySignature()	Gate logging behind #ifdef ICC_SIGNATURE_VERBOSE
DescribeColorSpaceSignature()	Inline validation check instead of calling IsValidColorSpaceSignature() to avoid log side-effects

Backward Compatibility

• Default behavior changes: All ICC_LOG_DEBUG / ICC_LOG_WARNING output is now silent unless the caller defines ICC_SIGNATURE_VERBOSE before including the header. This eliminates spurious stderr output that interfered with tools, analyzers, and fuzzers.
• API unchanged: All function signatures and return types are identical to V1.
• Return values expanded: Functions now return true for valid v5/iccMAX signatures that V1 incorrectly rejected.

Reproduction

# V1 (noisy output on valid v5 profile):
iccDumpProfile 17ChanPart1.icc ALL 2>&1 | grep ICC_WARN
# ICC_WARN: ColorSpace signature: 0x6e630011 (Unknown)

# V2 (silent — correct):
iccDumpProfile 17ChanPart1.icc ALL 2>&1 | grep ICC_WARN
# (no output)

Testing

• Verified with 17ChanPart1.icc (17-channel, sig 0x6e630011) — zero false warnings
• Verified MCH A-F profiles resolve correctly
• Verified all existing V1 test profiles produce identical results (API compatible)