Here is a list of all files with brief descriptions:

[detail level 1234]

zypp
base
Algorithm.h
Backtrace.cc
Backtrace.h
Collector.h
Counter.h
Debug.h	Debuging tools which should not be used in released code
DefaultIntegral.h
DtorReset.h
Easy.h
Errno.h
Exception.cc
Exception.h
ExternalDataSource.cc
ExternalDataSource.h
Fd.cc
Fd.h
Flags.h
Function.h
Functional.h
Gettext.cc
Gettext.h	Interface to gettext
GzStream.cc
GzStream.h
InputStream.cc
InputStream.h
InterProcessMutex.cc
InterProcessMutex.h
IOStream.cc
IOStream.h
Iterator.h
LogControl.cc
LogControl.h
Logger.h
LogTools.h
Measure.cc
Measure.h
NamedValue.h
NonCopyable.h
ProfilingFormater.cc
ProfilingFormater.h
ProvideNumericId.h
PtrTypes.h
Random.cc
Random.h
ReferenceCounted.cc
ReferenceCounted.h
Regex.cc
Regex.h
SerialNumber.cc
SerialNumber.h
Signal.h
String.cc
String.h
StrMatcher.cc
StrMatcher.h
Sysconfig.cc
Sysconfig.h
Tr1hash.h
Unit.cc
Unit.h
UserRequestException.cc
UserRequestException.h
WatchFile.h
Xml.h
media
proxyinfo
ProxyInfoImpl.h
ProxyInfoLibproxy.cc
ProxyInfoLibproxy.h
ProxyInfos.h
ProxyInfoSysconfig.cc
ProxyInfoSysconfig.h
CredentialFileReader.cc
CredentialFileReader.h
CredentialManager.cc
CredentialManager.h
CurlConfig.cc
CurlConfig.h
MediaAccess.cc
MediaAccess.h
MediaBlockList.cc
MediaBlockList.h
MediaCD.cc
MediaCD.h
MediaCIFS.cc
MediaCIFS.h
MediaCurl.cc
MediaCurl.h
MediaDIR.cc
MediaDIR.h
MediaDISK.cc
MediaDISK.h
MediaException.cc
MediaException.h
MediaHandler.cc
MediaHandler.h
MediaISO.cc
MediaISO.h
MediaManager.cc
MediaManager.h
MediaMultiCurl.cc
MediaMultiCurl.h
MediaNFS.cc
MediaNFS.h
MediaPlugin.cc
MediaPlugin.h
MediaPriority.cc
MediaPriority.h
MediaSource.cc
MediaSource.h
MediaUserAuth.cc
MediaUserAuth.h	Convenience interface for handling authentication data of media user
MetaLinkParser.cc
MetaLinkParser.h
Mount.cc
Mount.h
ProxyInfo.cc
ProxyInfo.h
TransferSettings.cc
TransferSettings.h
UrlResolverPlugin.cc
UrlResolverPlugin.h
ZsyncParser.cc
ZsyncParser.h
misc
CheckAccessDeleted.cc
CheckAccessDeleted.h
DefaultLoadSystem.cc
DefaultLoadSystem.h
parser
plaindir
RepoParser.cc
RepoParser.h
susetags
ContentFileReader.cc
ContentFileReader.h
RepoIndex.cc
RepoIndex.h
ws
WebpinResultFileReader.cc
WebpinResultFileReader.h
xml
libxmlfwd.cc
libxmlfwd.h
Node.cc
Node.h
Parse.h
ParseDef.cc
ParseDef.h
ParseDefConsume.cc
ParseDefConsume.h
ParseDefException.cc
ParseDefException.h
ParseDefTraits.h
Reader.cc
Reader.h
XmlEscape.cc
XmlEscape.h
XmlString.cc
XmlString.h
yum
PatchesFileReader.cc	Implementation of patches.xml file reader
PatchesFileReader.h	Interface of patches.xml file reader
RepomdFileReader.cc	Implementation of repomd.xml file reader
RepomdFileReader.h	Interface of repomd.xml file reader
HistoryLogReader.cc
HistoryLogReader.h
IniDict.cc
IniDict.h
IniParser.cc
IniParser.h
ParseException.cc
ParseException.h
ParserProgress.h
ProductFileReader.cc
ProductFileReader.h
RepoFileReader.cc
RepoFileReader.h
RepoindexFileReader.cc	Implementation of repoindex.xml file reader
RepoindexFileReader.h	Interface of repoindex.xml file reader
ServiceFileReader.cc
ServiceFileReader.h
pool
ByIdent.h
PoolImpl.cc
PoolImpl.h
PoolStats.cc
PoolStats.h
PoolTraits.h
repo
susetags
Downloader.cc
Downloader.h
yum
Downloader.cc
Downloader.h
ResourceType.cc
ResourceType.h
Applydeltarpm.cc
Applydeltarpm.h
DeltaCandidates.cc
DeltaCandidates.h
Downloader.cc
Downloader.h
MediaInfoDownloader.cc
MediaInfoDownloader.h
PackageDelta.cc
PackageDelta.h
PackageProvider.cc
PackageProvider.h
PluginServices.cc
PluginServices.h
RepoException.cc
RepoException.h
RepoInfoBase.cc
RepoInfoBase.h
RepoInfoBaseImpl.h
RepoMirrorList.cc
RepoMirrorList.h
RepoProvideFile.cc
RepoProvideFile.h
RepoType.cc
RepoType.h
RepoVariables.cc
RepoVariables.h
ServiceRepos.cc
ServiceRepos.h
ServiceType.cc
ServiceType.h
SrcPackageProvider.cc
SrcPackageProvider.h
SUSEMediaVerifier.cc
SUSEMediaVerifier.h
sat
detail
PoolImpl.cc
PoolImpl.h
PoolMember.h
AttrMatcher.h
LocaleSupport.cc
LocaleSupport.h
LookupAttr.cc
LookupAttr.h
LookupAttrTools.h
Map.cc
Map.h
Pool.cc
Pool.h
Queue.cc
Queue.h
Solvable.cc
Solvable.h
SolvableSet.cc
SolvableSet.h
SolvAttr.cc
SolvAttr.h
SolvIterMixin.cc
SolvIterMixin.h
Transaction.cc
Transaction.h
WhatObsoletes.cc
WhatObsoletes.h
WhatProvides.cc
WhatProvides.h
solver
detail
Helper.cc
Helper.h
ProblemSolutionCombi.cc
ProblemSolutionCombi.h
ProblemSolutionIgnore.cc
ProblemSolutionIgnore.h
Resolver.cc
Resolver.h
SATResolver.cc
SATResolver.h
SolutionAction.cc
SolutionAction.h
SolverQueueItem.cc
SolverQueueItem.h
SolverQueueItemDelete.cc
SolverQueueItemDelete.h
SolverQueueItemInstall.cc
SolverQueueItemInstall.h
SolverQueueItemInstallOneOf.cc
SolverQueueItemInstallOneOf.h
SolverQueueItemLock.cc
SolverQueueItemLock.h
SolverQueueItemUpdate.cc
SolverQueueItemUpdate.h
SystemCheck.cc
SystemCheck.h
Testcase.cc
Testcase.h
Types.h
libzypp_solver.h
target
hal
HalContext.cc	Hardware abstaction layer library wrapper implementation
HalContext.h	Hardware abstaction layer library wrapper
HalException.h	Hardware abstaction layer library wrapper
modalias
Modalias.cc
Modalias.h
rpm
BinHeader.cc
BinHeader.h
librpm.h
librpmDb.cc
librpmDb.cv3.cc
librpmDb.h
RpmCallbacks.cc
RpmCallbacks.h
RpmDb.cc
RpmDb.h
RpmException.cc
RpmException.h
RpmFlags.h
RpmHeader.cc
RpmHeader.h
CommitPackageCache.cc
CommitPackageCache.h
CommitPackageCacheImpl.cc
CommitPackageCacheImpl.h
CommitPackageCacheReadAhead.cc
CommitPackageCacheReadAhead.h
HardLocksFile.cc
HardLocksFile.h
RequestedLocalesFile.cc
RequestedLocalesFile.h
SoftLocksFile.cc
SoftLocksFile.h
TargetCallbackReceiver.cc
TargetCallbackReceiver.h
TargetException.cc
TargetException.h
TargetImpl.cc
TargetImpl.h
thread
Mutex.cc
Mutex.h
MutexException.h
MutexLock.h
Once.h
ui
Selectable.cc
Selectable.h
SelectableImpl.cc
SelectableImpl.h
SelectableTraits.h
SelFilters.h
Status.cc
Status.h
UserWantedPackages.cc
UserWantedPackages.h
url
UrlBase.cc
UrlBase.h
UrlException.h
UrlUtils.cc
UrlUtils.h
ws
WebpinResult.cc
WebpinResult.h
zypp_detail
ZYppImpl.cc
ZYppImpl.h
ZYppReadOnlyHack.h
APIConfig.h	Provides API related macros
Arch.cc
Arch.h
AutoDispose.h
Bit.h
ByteCount.cc
ByteCount.h
Callback.h
Capabilities.cc
Capabilities.h
Capability.cc
Capability.h
CapMatch.cc
CapMatch.h
Changelog.cc
Changelog.h
CheckSum.cc
CheckSum.h
CountryCode.cc
CountryCode.h
Date.cc
Date.h
Dep.cc
Dep.h
Digest.cc
Digest.h
DiskUsage.cc
DiskUsage.h
DiskUsageCounter.cc
DiskUsageCounter.h
DownloadMode.cc
DownloadMode.h
Edition.cc
Edition.h
ExternalProgram.cc
ExternalProgram.h
Fetcher.cc
Fetcher.h
FileChecker.cc
FileChecker.h
Filter.h
Glob.cc
Glob.h
HistoryLog.cc
HistoryLog.h
HistoryLogData.cc
HistoryLogData.h
IdString.cc
IdString.h
IdStringType.h
InstanceId.cc
InstanceId.h
KeyContext.h
KeyRing.cc
KeyRing.h
KVMap.h
LanguageCode.cc
LanguageCode.h
Locale.cc
Locale.h
Locks.cc
Locks.h
ManagedFile.h
MediaProducts.cc
MediaProducts.h	Functions to find out products in media
MediaSetAccess.cc
MediaSetAccess.h
Misc.h
OnMediaLocation.cc
OnMediaLocation.h
Package.cc
Package.h
PackageKeyword.h
Patch.cc
Patch.h
PathInfo.cc
PathInfo.h
Pathname.cc
Pathname.h
Pattern.cc
Pattern.h
PluginFrame.cc
PluginFrame.h
PluginFrameException.cc
PluginFrameException.h
PluginScript.cc
PluginScript.h
PluginScriptException.cc
PluginScriptException.h
PoolItem.cc
PoolItem.h
PoolItemBest.cc
PoolItemBest.h
PoolQuery.cc
PoolQuery.h
PoolQueryResult.cc
PoolQueryResult.h
PoolQueryUtil.tcc	Including fstream is not hell here because this header only included by implementation file, header doesn't need include it
ProblemSolution.cc
ProblemSolution.h
ProblemTypes.h
Product.cc
Product.h
ProgressData.cc
ProgressData.h
ProvideFilePolicy.cc
ProvideFilePolicy.h
PublicKey.cc
PublicKey.h
Range.cc
Range.h
Rel.cc
Rel.h
RelCompare.h
RepoInfo.cc
RepoInfo.h
RepoManager.cc
RepoManager.h
Repository.cc
Repository.h
RepoStatus.cc
RepoStatus.h
ResFilters.h
ResKind.cc
ResKind.h
ResObject.cc
ResObject.h
ResObjects.h
Resolvable.cc
Resolvable.h
Resolver.cc
Resolver.h
ResolverProblem.cc
ResolverProblem.h
ResPool.cc
ResPool.h
ResPoolProxy.cc
ResPoolProxy.h
ResStatus.cc
ResStatus.h
ResTraits.h
ServiceInfo.cc
ServiceInfo.h
Signature.cc
Signature.h
SrcPackage.cc
SrcPackage.h
SysContent.cc
SysContent.h
Target.cc
Target.h
TmpPath.cc
TmpPath.h
TriBool.h
Url.cc
Url.h
Vendor.h
VendorAttr.cc
VendorAttr.h
VendorSupportOptions.cc
VendorSupportOptions.h
ZConfig.cc
ZConfig.h
ZYpp.cc
ZYpp.h
ZYppCallbacks.h
ZYppCommit.h
ZYppCommitPolicy.cc
ZYppCommitPolicy.h
ZYppCommitResult.cc
ZYppCommitResult.h
ZYppFactory.cc
ZYppFactory.h