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Provide better support for overwriteable media

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This commit is contained in:
Mario Danic
2007-08-30 21:55:36 +00:00
parent 139fb6496c
commit 0746d622e4
4 changed files with 174 additions and 56 deletions
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12
libisofs/ecma119.c
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@ -430,17 +430,19 @@ ecma119_target_new(struct iso_volset *volset,
t->total_size = (t->curblock - t->ms_block) * t->block_size;
if (opts->dvd_plus_rw) {
if (opts->overwrite) {
/*
* Get a copy of the volume descriptors to be written in a DVD+RW
* disc
*/
uint8_t *buf;
opts->vol_desc_count = 2 + (t->eltorito ? 1 : 0) +
(t->joliet ? 1 : 0);
opts->vol_desc = calloc(opts->vol_desc_count, t->block_size);
buf = opts->vol_desc;
/* set the 32 block buffer to 0 */
memset(opts->overwrite, 0, 32 * t->block_size);
/* skip the first 16 blocks (system area) */
buf = opts->overwrite + 16 * t->block_size;
/*
* In the PVM to be written in the 16th sector of the disc, we

24
libisofs/libisofs.h
View File

@ -277,26 +277,12 @@ struct ecma119_source_opts {
* image, used to read file contents.
* Otherwise it can be NULL.
*/
unsigned int dvd_plus_rw:1;
uint8_t *overwrite;
/**<
* When 1, vol_desc and vol_desc_count will be filled propertly
* with information useful for "growing" a DVD+RW.
*/
uint8_t *vol_desc;
/**<
* If dvd_plus_rw is set to one, this will be filled with a
* pointer to a memory region containing a copy of the
* volume descriptors of the image, including the volume
* descriptor set terminator.
* A suitable program can write the contents of this memory
* region from sector 16 of a DVD+RW to "grow" its image.
* The size of this region will be vol_desc_count * 2048 and
* should be freed by user when no more needed.
*/
int vol_desc_count;
/**<
* If dvd_plus_rw is set to one, this will be filled with the
* number of volume descriptors written to vol_desc.
* When not NULL, it should point to a buffer of at least
* 64KiB, where libisofs will write the contents that should
* be written at the beginning of a overwriteable media, to
* grow the image.
*/
};