int pt_sec_file_read(const struct pt_section *section, uint8_t *buffer,
uint16_t size, uint64_t offset)
{
struct pt_sec_file_mapping *mapping;
FILE *file;
long begin, end, fbegin, fend;
size_t read;
int errcode;
if (!buffer || !section)
return -pte_invalid;
mapping = section->mapping;
if (!mapping)
return -pte_internal;
file = mapping->file;
begin = mapping->begin;
end = mapping->end;
fbegin = (long) offset;
if (((uint64_t) fbegin) != offset)
return -pte_nomap;
fbegin += begin;
fend = fbegin + size;
if (fend < fbegin)
return -pte_nomap;
if (end <= fbegin)
return -pte_nomap;
if (fbegin < begin)
return -pte_nomap;
errcode = fmap_lock(mapping);
if (errcode < 0)
return errcode;
errcode = fseek(file, fbegin, SEEK_SET);
if (errcode)
goto out_unlock;
read = fread(buffer, 1, size, file);
errcode = fmap_unlock(mapping);
if (errcode < 0)
return errcode;
return (int) read;
out_unlock:
(void) fmap_unlock(mapping);
return -pte_nomap;
}
int pt_sec_file_read(const struct pt_section *section, uint8_t *buffer,
uint16_t size, uint64_t offset)
{
struct pt_sec_file_mapping *mapping;
FILE *file;
long begin;
size_t read;
int errcode;
if (!buffer || !section)
return -pte_internal;
mapping = section->mapping;
if (!mapping)
return -pte_internal;
file = mapping->file;
/* We already checked in pt_section_read() that the requested memory
* lies within the section's boundaries.
*
* And we checked that the file covers the entire section in
* pt_sec_file_map(). There's no need to check for overflows, again.
*/
begin = mapping->begin + (long) offset;
errcode = fmap_lock(mapping);
if (errcode < 0)
return errcode;
errcode = fseek(file, begin, SEEK_SET);
if (errcode)
goto out_unlock;
read = fread(buffer, 1, size, file);
errcode = fmap_unlock(mapping);
if (errcode < 0)
return errcode;
return (int) read;
out_unlock:
(void) fmap_unlock(mapping);
return -pte_nomap;
}