15.3.3 ��

��, �� , �� , ��, ��- � ��-�� , � �� . �� headerRead. � �� . �� .

Header headerRead(FD_t fd,

enum hMagic magicp);

�� headerRead �� "��" ��. �� HEADER_MAGIC_YES �� , �� HEADER_MAGIC_NO - �� . �� , �� . �� RPM �� :

Header header = headerRead(fd, (lead.major >= 3) ?

HEADER_MAGIC_YES : HEADER_MAGIC_NO);

�� headerGetEntry. � �� . � �� , �� , � �� .

nt headerGetEntry(Header header,

int_32 tag,

hTYP_t type,

void **pointer,

hCNT_t data_size);

headerGetEntry �� 1 � �� 0 � �� . � �� , �� :

enum rpmTagType_e {

RPM_NULL_TYPE = 0,

RPM_CHAR_TYPE = 1,

RPM_INT8_TYPE = 2,

RPM_INT16_TYPE = 3,

RPM_INT32_TYPE = 4,

RPM_STRING_TYPE = 6,

RPM_BIN_TYPE = 7,

RPM_STRING_ARRAY_TYPE = 8,

RPM_I18NSTRING_TYPE

}

�� RPM_STRING_ARRAY_TYPE �� RPM_BIN_TYPE, �� , �� headerFreeData:

void* headerFreeData(const void *pointer,

rpmTagType type);

�� . �� headerFreeData �� . �� , �� .

�� headerGetEntry, �� , �� . �� --queryformat. �� rpmlib.h �� .

�� , �� :

/* Function to read a string header entry. */

char* readHeaderString(Header header, int_32 tag_id) {

int_32 type;

void* pointer;

int_32 data_size;

int header_status = headerGetEntry(header,

tag_id,

&type,

&pointer,

&data_size);

if (header_status) {

if (type == RPM_STRING_TYPE) {

return pointer;

}

}

return NULL;

}

�� ID ��. ��:

char* name = readHeaderString(header, RPMTAG_NAME);

char* version = readHeaderString(header, RPMTAG_VERSION);

char* release = readHeaderString(header, RPMTAG_RELEASE);

�� , �� headerNVR:

int headerNVR(Header header,

const char **nameptr,

const char **versionptr,

const char **releaseptr);

�� , �� , �� :

Header headerFree(Header header);

�� headerFree �� NULL, �� NULL �� . ��:

header = headerFree(header);

�� - ��
�� - �� rpm � ��
��

15.3.3 ������ ������

15.3.3 ��