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Further simplify hash code

This commit is contained in:
Behdad Esfahbod 2014-05-16 14:17:45 -06:00
parent 748e77e89f
commit 8284df49ef
1 changed files with 38 additions and 50 deletions
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88
src/fchash.c
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@ -129,6 +129,41 @@ FcHashDigestAddBlock (FcHashDigest digest,
#undef H #undef H
} }
static void
FcHashDigestFinish (FcHashDigest digest,
const char *residual, /* < 64 bytes */
size_t total_len)
{
char ibuf[64];
unsigned int len = total_len % 64;
uint64_t v;
if (!len)
return;
memcpy (ibuf, residual, len);
memset (ibuf + len, 0, 64 - len);
ibuf[len] = 0x80;
if ((64 - len) < 9)
{
FcHashDigestAddBlock (digest, ibuf);
memset (ibuf, 0, 64);
}
/* set input size at the end */
v = (uint64_t) total_len * 8;
ibuf[63 - 0] = v & 0xff;
ibuf[63 - 1] = (v >> 8) & 0xff;
ibuf[63 - 2] = (v >> 16) & 0xff;
ibuf[63 - 3] = (v >> 24) & 0xff;
ibuf[63 - 4] = (v >> 32) & 0xff;
ibuf[63 - 5] = (v >> 40) & 0xff;
ibuf[63 - 6] = (v >> 48) & 0xff;
ibuf[63 - 7] = (v >> 56) & 0xff;
FcHashDigestAddBlock (digest, ibuf);
}
static FcChar8 * static FcChar8 *
FcHashToString (const FcHashDigest digest) FcHashToString (const FcHashDigest digest)
{ {
@ -176,28 +211,7 @@ FcHashGetDigestFromFile (const FcChar8 *filename)
{ {
if ((len = fread (ibuf, sizeof (char), 64, fp)) < 64) if ((len = fread (ibuf, sizeof (char), 64, fp)) < 64)
{ {
uint64_t v; FcHashDigestFinish (digest, ibuf, st.st_size);
/* add a padding */
memset (&ibuf[len], 0, 64 - len);
ibuf[len] = 0x80;
if ((64 - len) < 9)
{
/* process a block once */
FcHashDigestAddBlock (digest, ibuf);
memset (ibuf, 0, 64);
}
/* set input size at the end */
v = (long)st.st_size * 8;
ibuf[63 - 0] = v & 0xff;
ibuf[63 - 1] = (v >> 8) & 0xff;
ibuf[63 - 2] = (v >> 16) & 0xff;
ibuf[63 - 3] = (v >> 24) & 0xff;
ibuf[63 - 4] = (v >> 32) & 0xff;
ibuf[63 - 5] = (v >> 40) & 0xff;
ibuf[63 - 6] = (v >> 48) & 0xff;
ibuf[63 - 7] = (v >> 56) & 0xff;
FcHashDigestAddBlock (digest, ibuf);
break; break;
} }
else else
@ -217,10 +231,9 @@ bail0:
FcChar8 * FcChar8 *
FcHashGetDigestFromMemory (const char *fontdata, FcHashGetDigestFromMemory (const char *fontdata,
size_t length) size_t length)
{ {
FcHashDigest digest; FcHashDigest digest;
char ibuf[64];
size_t i = 0; size_t i = 0;
FcHashInitDigest (digest); FcHashInitDigest (digest);
@ -229,32 +242,7 @@ FcHashGetDigestFromMemory (const char *fontdata,
{ {
if ((length - i) < 64) if ((length - i) < 64)
{ {
uint64_t v; FcHashDigestFinish (digest, fontdata+i, length);
size_t n;
/* add a padding */
n = length - i;
if (n > 0)
memcpy (ibuf, &fontdata[i], n);
memset (&ibuf[n], 0, 64 - n);
ibuf[n] = 0x80;
if ((64 - n) < 9)
{
/* process a block once */
FcHashDigestAddBlock (digest, ibuf);
memset (ibuf, 0, 64);
}
/* set input size at the end */
v = length * 8;
ibuf[63 - 0] = v & 0xff;
ibuf[63 - 1] = (v >> 8) & 0xff;
ibuf[63 - 2] = (v >> 16) & 0xff;
ibuf[63 - 3] = (v >> 24) & 0xff;
ibuf[63 - 4] = (v >> 32) & 0xff;
ibuf[63 - 5] = (v >> 40) & 0xff;
ibuf[63 - 6] = (v >> 48) & 0xff;
ibuf[63 - 7] = (v >> 56) & 0xff;
FcHashDigestAddBlock (digest, ibuf);
break; break;
} }
else else