| jerrym | f157933 | 2013-02-07 01:56:28 +0000 | [diff] [blame] | 1 | /*----------------------------------------------------------------------------*/
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| 2 | /* Copyright (c) FIRST 2008. All Rights Reserved. */
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| 3 | /* Open Source Software - may be modified and shared by FRC teams. The code */
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| 4 | /* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib. */
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| 5 | /*----------------------------------------------------------------------------*/
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| 6 |
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| 7 | #include "IntCameraParameter.h"
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| 8 | #include "pcre.h"
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| 9 | #include <stdio.h>
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| 10 | #include <string.h>
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| 11 |
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| 12 | /**
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| 13 | * Constructor for an integer camera parameter.
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| 14 | * @param setString The string to set a value in the HTTP request
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| 15 | * @param getString The string to retrieve a value in the HTTP request
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| 16 | */
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| 17 | IntCameraParameter::IntCameraParameter(const char *setString, const char *getString, bool requiresRestart)
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| 18 | {
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| 19 | m_changed = false;
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| 20 | m_value = 0;
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| 21 | m_setString = setString;
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| 22 | m_getString = getString;
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| 23 | m_requiresRestart = requiresRestart;
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| 24 | }
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| 25 |
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| 26 | /**
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| 27 | * Get a value for a camera parameter.
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| 28 | * @returns The camera parameter cached valued.
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| 29 | */
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| 30 | int IntCameraParameter::GetValue()
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| 31 | {
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| 32 | return m_value;
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| 33 | }
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| 34 |
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| 35 | /**
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| 36 | * Set a value for a camera parameter.
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| 37 | * Mark the value for change. The value will be updated in the parameter
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| 38 | * change loop.
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| 39 | */
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| 40 | void IntCameraParameter::SetValue(int value)
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| 41 | {
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| 42 | m_value = value;
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| 43 | m_changed = true;
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| 44 | }
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| 45 |
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| 46 | /**
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| 47 | * Check if a parameter has changed and update.
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| 48 | * Check if a parameter has changed and send the update string if it
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| 49 | * has changed. This is called from the loop in the parameter task loop.
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| 50 | * @returns true if the camera needs to restart
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| 51 | */
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| 52 | bool IntCameraParameter::CheckChanged(bool &changed, char *param)
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| 53 | {
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| 54 | changed = m_changed;
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| 55 | if (m_changed)
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| 56 | {
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| 57 | sprintf(param, m_setString, m_value);
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| 58 | m_changed = false;
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| 59 | return m_requiresRestart;
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| 60 | }
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| 61 | return false;
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| 62 | }
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| 63 |
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| 64 | /**
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| 65 | * Get a parameter value from the string.
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| 66 | * Get a parameter value from the camera status string. If it has been changed
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| 67 | * been changed by the program, then don't update it. Program values have
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| 68 | * precedence over those written in the camera.
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| 69 | */
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| 70 | void IntCameraParameter::GetParamFromString(const char *string, int stringLength)
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| 71 | {
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| 72 | char resultString[150];
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| 73 | if (SearchForParam(m_getString, string, stringLength, resultString) >= 0)
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| 74 | {
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| 75 | if (!m_changed) m_value = atoi(resultString);
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | /**
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| 80 | * @param pattern: the regular expression
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| 81 | * @param searchString the text to search
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| 82 | * @param searchStringLen the length of searchString
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| 83 | * @param result buffer to put resulting text into, must be pre-allocated
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| 84 | */
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| 85 | int IntCameraParameter::SearchForParam(const char *pattern, const char *searchString, int searchStringLen, char *result)
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| 86 | {
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| 87 | int vectorLen = 10;
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| 88 | int resultVector[vectorLen];
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| 89 | const char *error;
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| 90 | int erroffset;
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| 91 | pcre *compiledPattern = pcre_compile(
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| 92 | pattern, //"root.Image.I0.Appearance.Resolution=(.*)",
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| 93 | PCRE_CASELESS,
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| 94 | &error, // for error message
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| 95 | &erroffset, // for error offset
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| 96 | NULL); // use default character tables
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| 97 | int rc;
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| 98 | rc = pcre_exec(compiledPattern,
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| 99 | NULL,
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| 100 | searchString,
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| 101 | searchStringLen,
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| 102 | 0,
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| 103 | 0,
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| 104 | resultVector, //locations of submatches
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| 105 | vectorLen); //size of ovector
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| 106 | int length = resultVector[3] - resultVector[2];
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| 107 | memcpy(result, &searchString[resultVector[2]], length);
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| 108 | result[length] = '\0';
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| 109 | return rc;
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| 110 | }
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| 111 |
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