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** For any other binary type, return "unknown/unknown".
*/
const char *mimetype_from_content(Blob *pBlob){
int i;
int n;
const unsigned char *x;
static const char isBinary[] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1,
};
for(i=0; i<n; i++){
unsigned char c = x[i];
if( c<=0x1f && isBinary[c] ){
break;
}
}
if( i>=n ){
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** For any other binary type, return "unknown/unknown".
*/
const char *mimetype_from_content(Blob *pBlob){
int i;
int n;
const unsigned char *x;
/* A table of mimetypes based on file content prefixes
*/
static const struct {
const char *zPrefix; /* The file prefix */
int size; /* Length of the prefix */
const char *zMimetype; /* The corresponding mimetype */
} aMime[] = {
{ "GIF87a", 6, "image/gif" },
{ "GIF89a", 6, "image/gif" },
{ "\211PNG\r\n\032\n", 8, "image/png" },
{ "\377\332\377", 3, "image/jpeg" },
{ "\377\330\377", 3, "image/jpeg" },
};
x = (const unsigned char*)blob_buffer(pBlob);
n = blob_size(pBlob);
if( looks_like_text(pBlob) ){
return 0; /* Plain text */
}
for(i=0; i<sizeof(aMime)/sizeof(aMime[0]); i++){
if( n>=aMime[i].size && memcmp(x, aMime[i].zPrefix, aMime[i].size)==0 ){
return aMime[i].zMimetype;
}
}
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