Here are the data structures with brief descriptions:

CCmdOptions
Ccr_BinaryData
Ccr_ChangelogEntry
Ccr_CompressionTask
Ccr_ContentStat
Ccr_DeltaPackage
Ccr_DeltaTargetPackage
Ccr_Dependency
Ccr_DistroTag
Ccr_EVR
CCR_FILE
Ccr_HeaderRangeStruct
Ccr_MetadataLocation
Ccr_Metadatum
Ccr_ModifyRepoTask
Ccr_NEVR
Ccr_NEVRA
Ccr_Package
Ccr_PackageFile
Ccr_Repomd
Ccr_RepomdRecord
Ccr_RepomdRecordFillTask
Ccr_SqliteDb
Ccr_Statements
Ccr_UpdateCollection
Ccr_UpdateCollectionModule
Ccr_UpdateCollectionPackage
Ccr_UpdateInfo
Ccr_UpdateRecord
Ccr_UpdateReference
Ccr_Version
Ccr_XmlFile
Ccr_XmlStruct
CKojiMergedReposStuff
CPoolTask
Csrpm_val
CUserData