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Be clearer about ebml_parse_sized_int's sign & endian behavior.

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This commit is contained in:
Joseph Wallace 2015-12-01 02:21:24 -05:00
parent e6cb7e26ee
commit de004670c3
1 changed files with 10 additions and 6 deletions
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16
src/format_ebml.c
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@ -959,19 +959,23 @@ static ssize_t ebml_parse_var_int(unsigned char *buffer,
return size; return size;
} }
/* Parse a normal int that may be from 1-8 bytes long. /* Parse a big-endian int that may be from 1-8 bytes long.
* Returns 0 if there's not enough space to read the number; * Returns 0 if there's not enough space to read the number;
* Returns -1 if the number is mis-sized. * Returns -1 if the number is mis-sized.
* Else, returns the length of the number in bytes and writes the * Else, returns the length of the number in bytes and writes the
* value to *out_value. * value to *out_value.
* If is_signed is true, then the int is assumed to be two's complement
* signed, negative values will be correctly promoted, and the returned
* long long can be safely cast to a signed number on systems using
* two's complement arithmatic.
*/ */
static ssize_t ebml_parse_sized_int(unsigned char *buffer, static ssize_t ebml_parse_sized_int(unsigned char *buffer,
unsigned char *buffer_end, unsigned char *buffer_end,
size_t len, size_t len,
int is_signed, int is_signed,
unsigned long long *out_value) unsigned long long *out_value)
{ {
long long value; unsigned long long value;
size_t i; size_t i;
if (len < 1 || len > 8) { if (len < 1 || len > 8) {