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Now writing micro mock-up of APM Block0.

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Corrected block size handling with APM entry 1.
This commit is contained in:
Thomas Schmitt 2012-05-29 22:17:09 +02:00
parent 4fd7faa636
commit cc71d9e30b
1 changed files with 33 additions and 5 deletions
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38
libisofs/system_area.c
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@ -740,6 +740,9 @@ int cmp_apm_partition_request(const void *f1, const void *f2)
return 0;
}
/* @param flag bit0= This is the entry in block 1. Its blocks are already in
the desired apm_block_size unit. Set block_fac to 1.
*/
static int iso_write_apm_entry(Ecma119Image *t, int apm_block_size,
struct iso_apm_partition_request *req,
uint8_t *buf, int map_entries, int flag)
@ -747,7 +750,11 @@ static int iso_write_apm_entry(Ecma119Image *t, int apm_block_size,
uint8_t *wpt;
int block_fac;
block_fac = 2048 / apm_block_size;
if (flag & 1)
block_fac = 1;
else
block_fac = 2048 / apm_block_size;
memset(buf, apm_block_size, 0);
wpt = buf;
@ -792,6 +799,12 @@ static int iso_write_apm(Ecma119Image *t, uint32_t img_blocks, uint8_t *buf)
int i, ret, gap_counter = 0, up_to;
uint32_t part_end, goal;
char gap_name[33];
/* This is a micro mick-up of an APM Block0
and also harmless x86 machine code.
*/
static uint8_t block0_template[8] = {
0x45, 0x52, 0x02, 0x00, 0xeb, 0x02, 0xff, 0xff
};
#ifdef NIX
/* Disabled */
@ -800,10 +813,10 @@ static int iso_write_apm(Ecma119Image *t, uint32_t img_blocks, uint8_t *buf)
if (t->apm_req_count <= 0) {
/*
ret = iso_quick_apm_entry(t, 16, 20, "Test1_name_16_20", "Test1_type");
ret = iso_quick_apm_entry(t, 30, 20, "Test1_name_30_20", "Test1_type");
*/
/* >>> Caution: Size 90 causes intentional partition overlap error */
/ * >>> Caution: Size 90 causes intentional partition overlap error * /
ret = iso_quick_apm_entry(t, 30, 90, "BAD_30_90_BAD", "Test1_type");
*/
ret = iso_quick_apm_entry(t, 30, 20, "Test1_name_30_20", "Test1_type");
if (ret < 0)
return ret;
ret = iso_quick_apm_entry(t, 100, 400, "Test2_name_100_400",
@ -867,6 +880,14 @@ static int iso_write_apm(Ecma119Image *t, uint32_t img_blocks, uint8_t *buf)
qsort(t->apm_req, t->apm_req_count,
sizeof(struct iso_apm_partition_request *), cmp_apm_partition_request);
/* These are the only APM block sizes which can be processed here */
if (t->apm_block_size > 1536)
t->apm_block_size = 2048;
else if (t->apm_block_size > 768)
t->apm_block_size = 1024;
else
t->apm_block_size = 512;
/* If block size is larger than 512, then not all 63 entries will fit */
if ((t->apm_req_count + 1) * t->apm_block_size > 32768)
return ISO_BOOT_TOO_MANY_APM;
@ -876,9 +897,16 @@ static int iso_write_apm(Ecma119Image *t, uint32_t img_blocks, uint8_t *buf)
/* >>> ts B20526 : ??? isohybrid has 16. Logical block count is 10. Why ?*/
t->apm_req[0]->block_count = t->apm_req_count;
/* Write APM block 0. Very sparse, not to overwrite much of possible MBR.*/
memcpy(buf, block0_template, 8);
buf[2]= (t->apm_block_size >> 8) & 0xff;
buf[3]= 0;
/* Write APM Block 1 to t->apm_req_count */
for (i = 0; i < t->apm_req_count; i++) {
ret = iso_write_apm_entry(t, t->apm_block_size, t->apm_req[i],
buf + (i + 1) * t->apm_block_size, t->apm_req_count, 0);
buf + (i + 1) * t->apm_block_size, t->apm_req_count,
i == 0);
if (ret < 0)
return ret;
}