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Making an educated guess whether the boot images contain a boot info table.

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New API call el_torito_seems_boot_info_table() publishes this guess.
This commit is contained in:
Thomas Schmitt
2010-04-29 15:10:18 +02:00
parent 3d9367d52a
commit e4cf93665a
4 changed files with 252 additions and 25 deletions
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41
libisofs/libisofs.h
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@@ -2631,35 +2631,41 @@ int el_torito_set_selection_crit(ElToritoBootImage *bootimg, uint8_t crit[20]);
*/
int el_torito_get_selection_crit(ElToritoBootImage *bootimg, uint8_t crit[20]);
/**
* Specifies that this image needs to be patched. This involves the writing
* of a 56 bytes boot information table at offset 8 of the boot image file.
* The original boot image file won't be modified.
* This is needed for isolinux boot images.
* Makes a guess whether the boot image was patched by a boot information
* table. It is advisable to patch such boot images if their content gets
* copied to a new location. See el_torito_set_isolinux_options().
* Note: The reply can be positive only if the boot image was imported
* from an existing ISO image.
*
* @since 0.6.2
* @deprecated Use el_torito_set_isolinux_options() instead
* @param bootimg
* The image to inquire
* @return
* 1 = seems to contain oot info table , 0 = quite surely not
* @since 0.6.32
*/
void el_torito_patch_isolinux_image(ElToritoBootImage *bootimg);
int el_torito_seems_boot_info_table(ElToritoBootImage *bootimg, int flag);
/**
* Specifies options for ISOLINUX or GRUB boot images. This should only be used
* if the type of boot image is known.
*
* Regrettably there is no unambigous way to detect the presence of a boot
* info table in a boot image or the relation of a boot image to the System
* Area and its eventual MBR.
*
* @param options
* bitmask style flag. The following values are defined:
*
* bit 0 -> 1 to patch the boot info table of the boot image.
* 1 does the same as mkisofs option -boot-info-table.
* Needed for ISOLINUX and for GRUB rescue boot images.
* Needed for ISOLINUX or GRUB boot images with platform ID 0.
* The table is located at byte 8 of the boot image file.
* Its size is 56 bytes.
* The original boot image file on disk will not be modified.
*
* One may use el_torito_seems_boot_info_table() for a
* qualified guess whether a boot info table is present in
* the boot image. If the result is 1 then it should get bit0
* set if its content gets copied to a new LBA.
*
* bit 1 -> 1 to generate a ISOLINUX isohybrid image with MBR.
* ----------------------------------------------------------
* @deprecated since 31 Mar 2010:
@@ -2695,6 +2701,17 @@ int el_torito_set_isolinux_options(ElToritoBootImage *bootimg,
*/
int el_torito_get_isolinux_options(ElToritoBootImage *bootimg, int flag);
/** Deprecated:
* Specifies that this image needs to be patched. This involves the writing
* of a 16 bytes boot information table at offset 8 of the boot image file.
* The original boot image file won't be modified.
* This is needed for isolinux boot images.
*
* @since 0.6.2
* @deprecated Use el_torito_set_isolinux_options() instead
*/
void el_torito_patch_isolinux_image(ElToritoBootImage *bootimg);
/**
* Obtain a copy of the eventually loaded first 32768 bytes of the imported
* session, the System Area.