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Add qrwebpost to generate URLs for easier data collection.

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Using the qrwebpost debugger command one can initialize an id for
subsequent QR codes. All QR codes generated following such an
invokation produce URL QR codes that link to an online service that
concatenates all data with the same id and later allows it to be
displayed/downloaded in one piece. This makes collecting larger amounts
of data more convenient. Note though that the URL encoding does waste
space and therefore reduces data density, causing more QR codes to be
generated for the same amount of input data.
This commit is contained in:
Michael Lotz 2012-07-01 18:29:11 +02:00
parent db744fca35
commit a86c7d0ab3
1 changed files with 97 additions and 4 deletions
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101
src/add-ons/kernel/debugger/qrencode/module.cpp
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@ -8,6 +8,7 @@
#include <debug.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -17,11 +18,15 @@ extern "C" {
}
static const char* kWebPostBaseURL = "http://haiku.mlotz.ch/qrencode/store.php";
static char sStringBuffer[16 * 1024];
static char sEncodeBuffer[3 * 1024];
static int sBufferPosition = 0;
static int sQRCodeVersion = 19;
static QRecLevel sQRCodeLevel = QR_ECLEVEL_L;
static char sWebPostId[64];
static int sWebPostCounter = 0;
static bool
@ -69,6 +74,50 @@ print_qrcode(QRcode* qrCode, bool waitForKey)
}
static int
encode_url(const char* query, const char* data, int encodeLength,
int inputLength)
{
sEncodeBuffer[0] = 0;
strlcat(sEncodeBuffer, kWebPostBaseURL, encodeLength + 1);
strlcat(sEncodeBuffer, "?id=", encodeLength + 1);
strlcat(sEncodeBuffer, sWebPostId, encodeLength + 1);
strlcat(sEncodeBuffer, "&", encodeLength + 1);
strlcat(sEncodeBuffer, query, encodeLength + 1);
int position = strlcat(sEncodeBuffer, "=", encodeLength + 1);
if (position > encodeLength)
return -1;
int copyCount = 0;
while (inputLength > 0 && position < encodeLength) {
char character = data[copyCount];
if ((character >= 'a' && character <= 'z')
|| (character >= 'A' && character <= 'Z')
|| (character >= '0' && character <= '9')
|| character == '.' || character == '-' || character == '_'
|| character == '~') {
sEncodeBuffer[position++] = character;
sEncodeBuffer[position] = 0;
} else {
// Encode to a %xx escape.
if (encodeLength - position < 3) {
// Doesn't fit anymore, we're done.
break;
}
char escaped[4];
sprintf(escaped, "%%%.2x", character);
position = strlcat(sEncodeBuffer, escaped, encodeLength + 1);
}
inputLength--;
copyCount++;
}
return copyCount;
}
static int
qrencode(int argc, char* argv[])
{
@ -91,14 +140,25 @@ qrencode(int argc, char* argv[])
int inputLength = strlen(source);
int encodeLength = QRspec_getDataLength(sQRCodeVersion, sQRCodeLevel) - 3;
while (inputLength > 0) {
int copyCount = inputLength < encodeLength ? inputLength : encodeLength;
memcpy(sEncodeBuffer, source, copyCount);
sEncodeBuffer[copyCount] = 0;
int copyCount = 0;
if (sWebPostId[0] != 0) {
copyCount = encode_url(sWebPostCounter++ == 0 ? "clear" : "data",
source, encodeLength, inputLength);
if (copyCount < 0) {
kprintf("Failed to URL encode buffer.\n");
QRcode_clearCache();
return 1;
}
} else {
copyCount = inputLength < encodeLength ? inputLength : encodeLength;
memcpy(sEncodeBuffer, source, copyCount);
sEncodeBuffer[copyCount] = 0;
}
QRcode* qrCode = QRcode_encodeString8bit(sEncodeBuffer, sQRCodeVersion,
sQRCodeLevel);
if (qrCode == NULL) {
kprintf("Failed to encode buffer into qr code\n");
kprintf("Failed to encode buffer into qr code.\n");
QRcode_clearCache();
return 1;
}
@ -222,6 +282,36 @@ qrconfig(int argc, char* argv[])
}
static int
qrwebpost(int argc, char* argv[])
{
if (argc >= 3 && strcmp(argv[1], "start") == 0) {
strlcpy(sWebPostId, argv[2], sizeof(sWebPostId));
sWebPostCounter = 0;
// Generate the clear code.
const char* args[2] = { "", "yes" };
qrencode(2, (char**)args);
} else if (argc >= 2 && strcmp(argv[1], "stop") == 0) {
sWebPostId[0] = 0;
} else {
kprintf("%s start <id>\n", argv[0]);
kprintf("%s stop\n", argv[0]);
kprintf("Causes the QR codes to be rendered as URLs that resolve to\n"
"a service that allows appending the data of multiple QR codes\n"
"for easier handling.\n"
"An initial QR code is generated that invokes a clear operation\n"
"to prepare the output file on the server.\n"
"Note that there is no logic behind the service, if you and\n"
"someone else use the same id at the same time, they will\n"
"overwrite eachother. Therefore use a reasonably unique name.\n");
return 1;
}
return 0;
}
static status_t
std_ops(int32 op, ...)
{
@ -237,6 +327,8 @@ std_ops(int32 op, ...)
"encodes the current QR buffer and clears it");
add_debugger_command("qrconfig", qrconfig,
"sets the QR code version to be used");
add_debugger_command("qrwebpost", qrwebpost,
"sets up URL encoding for QR codes");
return B_OK;
case B_MODULE_UNINIT:
remove_debugger_command("qrencode", qrencode);
@ -244,6 +336,7 @@ std_ops(int32 op, ...)
remove_debugger_command("qrclear", qrclear);
remove_debugger_command("qrflush", qrflush);
remove_debugger_command("qrconfig", qrconfig);
remove_debugger_command("qrwebpost", qrwebpost);
return B_OK;
}