diff options
Diffstat (limited to 'fontconfig/src/fchash.c')
| -rw-r--r-- | fontconfig/src/fchash.c | 57 |
1 files changed, 56 insertions, 1 deletions
diff --git a/fontconfig/src/fchash.c b/fontconfig/src/fchash.c index 827b20f9f..92585a632 100644 --- a/fontconfig/src/fchash.c +++ b/fontconfig/src/fchash.c @@ -220,7 +220,7 @@ FcHashGetSHA256DigestFromFile (const FcChar8 *filename) ret = FcHashInitSHA256Digest (); if (!ret) - return NULL; + goto bail0; while (!feof (fp)) { @@ -261,5 +261,60 @@ FcHashGetSHA256DigestFromFile (const FcChar8 *filename) bail0: fclose (fp); + return NULL; } + +FcChar8 * +FcHashGetSHA256DigestFromMemory (const char *fontdata, + size_t length) +{ + char ibuf[64]; + FcChar32 *ret; + size_t i = 0; + + ret = FcHashInitSHA256Digest (); + if (!ret) + return NULL; + + while (i <= length) + { + if ((length - i) < 64) + { + long v; + 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 */ + FcHashComputeSHA256Digest (ret, 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; + FcHashComputeSHA256Digest (ret, ibuf); + break; + } + else + { + FcHashComputeSHA256Digest (ret, &fontdata[i]); + } + i += 64; + } + + return FcHashSHA256ToString (ret); +} |