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lightning-sunbird  0.9+nobinonly
nsScriptableInputStream.cpp
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00002 /* ***** BEGIN LICENSE BLOCK *****
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00024  * Alternatively, the contents of this file may be used under the terms of
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00037 
00038 #include "nsScriptableInputStream.h"
00039 #include "nsMemory.h"
00040 
00041 NS_IMPL_ISUPPORTS1(nsScriptableInputStream, nsIScriptableInputStream)
00042 
00043 // nsIBaseStream methods
00044 NS_IMETHODIMP
00045 nsScriptableInputStream::Close(void) {
00046     if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
00047     return mInputStream->Close();
00048 }
00049 
00050 // nsIScriptableInputStream methods
00051 NS_IMETHODIMP
00052 nsScriptableInputStream::Init(nsIInputStream *aInputStream) {
00053     if (!aInputStream) return NS_ERROR_NULL_POINTER;
00054     mInputStream = aInputStream;
00055     return NS_OK;
00056 }
00057 
00058 NS_IMETHODIMP
00059 nsScriptableInputStream::Available(PRUint32 *_retval) {
00060     if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
00061     return mInputStream->Available(_retval);
00062 }
00063 
00064 NS_IMETHODIMP
00065 nsScriptableInputStream::Read(PRUint32 aCount, char **_retval) {
00066     nsresult rv = NS_OK;
00067     PRUint32 count = 0;
00068     char *buffer = nsnull;
00069 
00070     if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
00071 
00072     rv = mInputStream->Available(&count);
00073     if (NS_FAILED(rv)) return rv;
00074 
00075     count = PR_MIN(count, aCount);
00076     buffer = (char*)nsMemory::Alloc(count+1); // make room for '\0'
00077     if (!buffer) return NS_ERROR_OUT_OF_MEMORY;
00078 
00079     PRUint32 amtRead = 0;
00080     rv = mInputStream->Read(buffer, count, &amtRead);
00081     if (NS_FAILED(rv)) {
00082         nsMemory::Free(buffer);
00083         return rv;
00084     }
00085 
00086     buffer[amtRead] = '\0';
00087     *_retval = buffer;
00088     return NS_OK;
00089 }
00090 
00091 NS_METHOD
00092 nsScriptableInputStream::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult) {
00093     if (aOuter) return NS_ERROR_NO_AGGREGATION;
00094 
00095     nsScriptableInputStream *sis = new nsScriptableInputStream();
00096     if (!sis) return NS_ERROR_OUT_OF_MEMORY;
00097 
00098     NS_ADDREF(sis);
00099     nsresult rv = sis->QueryInterface(aIID, aResult);
00100     NS_RELEASE(sis);
00101     return rv;
00102 }