Download NHK English news podcast automatically. This application requires mpod mother board. See also http://mbed.org/users/geodenx/notebook/mpod/
Dependencies: BlinkLed HTTPClient EthernetInterface FatFileSystemCpp MSCFileSystem mbed-rtos mbed
Download NHK English news podcast automatically. This application requires mpod mother board. See also http://mbed.org/users/geodenx/notebook/mpod/
Diff: HTTPFile.cpp
- Revision:
- 0:1855a008f28e
- Child:
- 4:ab3092d15121
diff -r 000000000000 -r 1855a008f28e HTTPFile.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPFile.cpp Thu Aug 16 15:49:19 2012 +0000 @@ -0,0 +1,120 @@ +/* HTTPFile.cpp */ +#include "HTTPFile.h" + +#include <cstring> + +#define OK 0 +#define NG -1 + +using std::memcpy; +using std::strncpy; +using std::strlen; + +HTTPFile::HTTPFile(const char* path) : + m_fp(NULL), + m_path(path), + m_len(0), + m_chunked(false) +{ +} + +HTTPFile::~HTTPFile() +{ + closeFile(); +} + +void HTTPFile::clear() +{ + closeFile(); + //Force reopening +} + +/*virtual*/ int HTTPFile::read(char* buf, size_t len, size_t* pReadLen) +{ + if(!openFile("r")) //File does not exist, or I/O error... + return NG; + + *pReadLen = fread(buf, 1, len, m_fp); + if( feof(m_fp) ) + { + //File read completely, we can close it + closeFile(); + } + return OK; +} + +/*virtual*/ int HTTPFile::write(const char* buf, size_t len) +{ + if(!openFile("w")) //File does not exist, or I/O error... + return NG; + + len = fwrite(buf, 1, len, m_fp); + //DBG("Written %d bytes in %d\n", len, m_fp); + if( (!m_chunked && (ftell(m_fp) >= m_len)) || (m_chunked && !len) ) + { + //File received completely, we can close it + closeFile(); + } + return len; +} + +/*virtual*/ int HTTPFile::getDataType(char* type, size_t maxTypeLen) //Internet media type for Content-Type header +{ + strncpy(type, "text/plain", maxTypeLen-1); + type[maxTypeLen-1] = '\0'; + return OK; +} + +/*virtual*/ void HTTPFile::setDataType(const char* type) //Internet media type from Content-Type header +{ + //Do not really care here +} + +/*virtual*/ bool HTTPFile::getIsChunked() //For Transfer-Encoding header +{ + return false; +} + +/*virtual*/ void HTTPFile::setIsChunked(bool chunked) //For Transfer-Encoding header +{ + m_chunked = chunked; +} + +/*virtual*/ size_t HTTPFile::getDataLen() //For Content-Length header +{ + return m_len; +} + +/*virtual*/ void HTTPFile::setDataLen(size_t len) //For Content-Length header, or if the transfer is chunked, next chunk length +{ + if(!m_chunked) + m_len = len; //Useful so that we can close file when last byte is written +} + +bool HTTPFile::openFile(const char* mode) //true on success, false otherwise +{ + if(m_fp) + return true; + + m_fp = fopen(m_path.c_str(), mode); + if(m_fp && mode[0]=='r') + { + //Seek EOF to get length + fseek(m_fp, 0, SEEK_END); + m_len = ftell(m_fp); + fseek(m_fp, 0, SEEK_SET); //Goto SOF + } + + //DBG("fd = %d\n", m_fp); + + if(!m_fp) + return false; + + return true; +} + +void HTTPFile::closeFile() +{ + if(m_fp) + fclose(m_fp); +}