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authorMichael Krelin <hacker@klever.net>2006-08-11 16:01:56 (UTC)
committer Michael Krelin <hacker@klever.net>2006-08-11 16:01:56 (UTC)
commit0c21a7a0d5b84dc6726462f0fbe51b8c32433262 (patch) (side-by-side diff)
tree9df6334cb1a61efebe68f7bcef9aa119a823626a /lib/util.cc
parent9bcc235e575a95989a5903394c127accbeef2e0f (diff)
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initial commit into repository0.0
Diffstat (limited to 'lib/util.cc') (more/less context) (ignore whitespace changes)
-rw-r--r--lib/util.cc96
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/util.cc b/lib/util.cc
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--- a/dev/null
+++ b/lib/util.cc
@@ -0,0 +1,96 @@
+#include <midillo/util.h>
+#include <midillo/exception.h>
+
+namespace midillo {
+
+ unsigned long read32(istream& s) {
+ unsigned long rv = 0;
+ for(int t=0;t<4;++t) {
+ rv<<=8;
+ rv|=0xFF&s.get();
+ if(!s.good())
+ throw exception_input_error(CODEPOINT,"Input error");
+ }
+ return rv;
+ }
+
+ unsigned int read16(istream& s) {
+ unsigned int rv = 0;
+ for(int t=0;t<2;++t) {
+ rv<<=8;
+ rv|=0xFF&s.get();
+ if(!s.good())
+ throw exception_input_error(CODEPOINT,"Input error");
+ }
+ return rv;
+ }
+
+ unsigned long readVL(istream& s) {
+ unsigned long rv=s.get();
+ if(!s.good())
+ throw exception_input_error(CODEPOINT,"Error reading VLQ");
+ int b;
+ if(rv&0x80) {
+ rv&=0x7F;
+ do {
+ rv = (rv<<7)|( (b=s.get())&0x7F );
+ if(!s.good())
+ throw exception_input_error(CODEPOINT,"Error reading VLQ");
+ }while(b&0x80);
+ }
+ return rv;
+ }
+
+ void write32(ostream& s,unsigned long d) {
+ for(int t=3;t>=0;--t) {
+ s.put(((const char*)&d)[t]);
+ if(!s.good())
+ throw exception_output_error(CODEPOINT,"Output error");
+ }
+ }
+
+ void write16(ostream& s,unsigned int d) {
+ for(int t=1;t>=0;--t) {
+ s.put(((const char*)&d)[t]);
+ if(!s.good())
+ throw exception_output_error(CODEPOINT,"Output error");
+ }
+ }
+
+ void writeVL(ostream& s,unsigned long d) {
+ // TODO: I don't think this is perfectly written code
+ unsigned long tmp = d&0x7F;
+ while(d>>=7) {
+ tmp<<=8;
+ tmp |=((d&0x7F)|0x80);
+ }
+ for(;;) {
+ s.put(tmp&0xFF);
+ if(!s.good())
+ throw exception_output_error(CODEPOINT,"Error writing VLQ");
+ if(tmp&0x80)
+ tmp>>=8;
+ else
+ break;
+ }
+ }
+
+ unsigned long calcVLsize(unsigned long d) {
+ unsigned long rv = 0;
+ // TODO: imperfect code revisited
+ unsigned long tmp = d&0x7F;
+ while(d>>=7) {
+ tmp<<=8;
+ tmp |=((d&0x7F)|0x80);
+ }
+ for(;;) {
+ ++rv;
+ if(tmp&0x80)
+ tmp>>=8;
+ else
+ break;
+ }
+ return rv;
+ }
+
+}