Graham Cantin / MODSERIAL

trying to make telnetserver repo public

Fork of MODSERIAL by Andy K

RESIZE.cpp@0:eb2522b41db8, 2010-11-20 (annotated)

Committer:
AjK
Date:
Sat Nov 20 16:54:05 2010 +0000
Revision:
0:eb2522b41db8
1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 0:eb2522b41db8 1 /*
AjK 0:eb2522b41db8 2 Copyright (c) 2010 Andy Kirkham
AjK 0:eb2522b41db8 3
AjK 0:eb2522b41db8 4 Permission is hereby granted, free of charge, to any person obtaining a copy
AjK 0:eb2522b41db8 5 of this software and associated documentation files (the "Software"), to deal
AjK 0:eb2522b41db8 6 in the Software without restriction, including without limitation the rights
AjK 0:eb2522b41db8 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
AjK 0:eb2522b41db8 8 copies of the Software, and to permit persons to whom the Software is
AjK 0:eb2522b41db8 9 furnished to do so, subject to the following conditions:
AjK 0:eb2522b41db8 10
AjK 0:eb2522b41db8 11 The above copyright notice and this permission notice shall be included in
AjK 0:eb2522b41db8 12 all copies or substantial portions of the Software.
AjK 0:eb2522b41db8 13
AjK 0:eb2522b41db8 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
AjK 0:eb2522b41db8 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
AjK 0:eb2522b41db8 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AjK 0:eb2522b41db8 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
AjK 0:eb2522b41db8 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
AjK 0:eb2522b41db8 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
AjK 0:eb2522b41db8 20 THE SOFTWARE.
AjK 0:eb2522b41db8 21 */
AjK 0:eb2522b41db8 22
AjK 0:eb2522b41db8 23 #include "MODSERIAL.h"
AjK 0:eb2522b41db8 24 #include "MACROS.h"
AjK 0:eb2522b41db8 25
AjK 0:eb2522b41db8 26 namespace AjK {
AjK 0:eb2522b41db8 27
AjK 0:eb2522b41db8 28 int
AjK 0:eb2522b41db8 29 MODSERIAL::resizeBuffer(int size, IrqType type, bool memory_check)
AjK 0:eb2522b41db8 30 {
AjK 0:eb2522b41db8 31 int rval = Ok;
AjK 0:eb2522b41db8 32
AjK 0:eb2522b41db8 33 // If the requested size is the same as the current size there's nothing to do,
AjK 0:eb2522b41db8 34 // just continue to use the same buffer as it's fine as it is.
AjK 0:eb2522b41db8 35 if (buffer_size[type] == size) return rval;
AjK 0:eb2522b41db8 36
AjK 0:eb2522b41db8 37 // Make sure the ISR cannot use the buffers while we are manipulating them.
AjK 0:eb2522b41db8 38 disableIrq();
AjK 0:eb2522b41db8 39
AjK 0:eb2522b41db8 40 // If the requested buffer size is larger than the current size,
AjK 0:eb2522b41db8 41 // attempt to create a new buffer and use it.
AjK 0:eb2522b41db8 42 if (buffer_size[type] < size) {
AjK 0:eb2522b41db8 43 rval = upSizeBuffer(size, type, memory_check);
AjK 0:eb2522b41db8 44 }
AjK 0:eb2522b41db8 45 else if (buffer_size[type] > size) {
AjK 0:eb2522b41db8 46 rval = downSizeBuffer(size, type, memory_check);
AjK 0:eb2522b41db8 47 }
AjK 0:eb2522b41db8 48
AjK 0:eb2522b41db8 49 // Start the ISR system again with the new buffers.
AjK 0:eb2522b41db8 50 enableIrq();
AjK 0:eb2522b41db8 51
AjK 0:eb2522b41db8 52 return rval;
AjK 0:eb2522b41db8 53 }
AjK 0:eb2522b41db8 54
AjK 0:eb2522b41db8 55 int
AjK 0:eb2522b41db8 56 MODSERIAL::downSizeBuffer(int size, IrqType type, bool memory_check)
AjK 0:eb2522b41db8 57 {
AjK 0:eb2522b41db8 58 if (size >= buffer_count[type]) {
AjK 0:eb2522b41db8 59 return BufferOversize;
AjK 0:eb2522b41db8 60 }
AjK 0:eb2522b41db8 61
AjK 0:eb2522b41db8 62 char *s = (char *)malloc(size);
AjK 0:eb2522b41db8 63
AjK 0:eb2522b41db8 64 if (s == (char *)NULL) {
AjK 0:eb2522b41db8 65 if (memory_check) {
AjK 0:eb2522b41db8 66 error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX");
AjK 0:eb2522b41db8 67 }
AjK 0:eb2522b41db8 68 return NoMemory;
AjK 0:eb2522b41db8 69 }
AjK 0:eb2522b41db8 70
AjK 0:eb2522b41db8 71 int c, new_in = 0;
AjK 0:eb2522b41db8 72
AjK 0:eb2522b41db8 73 do {
AjK 0:eb2522b41db8 74 c = __getc(false);
AjK 0:eb2522b41db8 75 if (c != -1) s[new_in++] = (char)c;
AjK 0:eb2522b41db8 76 if (new_in >= size) new_in = 0;
AjK 0:eb2522b41db8 77 }
AjK 0:eb2522b41db8 78 while (c != -1);
AjK 0:eb2522b41db8 79
AjK 0:eb2522b41db8 80 free((char *)buffer[type]);
AjK 0:eb2522b41db8 81 buffer[type] = s;
AjK 0:eb2522b41db8 82 buffer_in[type] = new_in;
AjK 0:eb2522b41db8 83 buffer_out[type] = 0;
AjK 0:eb2522b41db8 84 return Ok;
AjK 0:eb2522b41db8 85 }
AjK 0:eb2522b41db8 86
AjK 0:eb2522b41db8 87 int
AjK 0:eb2522b41db8 88 MODSERIAL::upSizeBuffer(int size, IrqType type, bool memory_check)
AjK 0:eb2522b41db8 89 {
AjK 0:eb2522b41db8 90 char *s = (char *)malloc(size);
AjK 0:eb2522b41db8 91
AjK 0:eb2522b41db8 92 if (s == (char *)NULL) {
AjK 0:eb2522b41db8 93 if (memory_check) {
AjK 0:eb2522b41db8 94 error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX");
AjK 0:eb2522b41db8 95 }
AjK 0:eb2522b41db8 96 return NoMemory;
AjK 0:eb2522b41db8 97 }
AjK 0:eb2522b41db8 98
AjK 0:eb2522b41db8 99 if (buffer_count[type] == 0) { // Current buffer empty?
AjK 0:eb2522b41db8 100 free((char *)buffer[type]);
AjK 0:eb2522b41db8 101 buffer[type] = s;
AjK 0:eb2522b41db8 102 buffer_in[type] = 0;
AjK 0:eb2522b41db8 103 buffer_out[type] = 0;
AjK 0:eb2522b41db8 104 }
AjK 0:eb2522b41db8 105 else { // Copy the current contents into the new buffer.
AjK 0:eb2522b41db8 106 int c, new_in = 0;
AjK 0:eb2522b41db8 107 do {
AjK 0:eb2522b41db8 108 c = __getc(false);
AjK 0:eb2522b41db8 109 if (c != -1) s[new_in++] = (char)c;
AjK 0:eb2522b41db8 110 if (new_in >= size) new_in = 0; // Shouldn't happen, but be sure.
AjK 0:eb2522b41db8 111 }
AjK 0:eb2522b41db8 112 while (c != -1);
AjK 0:eb2522b41db8 113 free((char *)buffer[type]);
AjK 0:eb2522b41db8 114 buffer[type] = s;
AjK 0:eb2522b41db8 115 buffer_in[type] = new_in;
AjK 0:eb2522b41db8 116 buffer_out[type] = 0;
AjK 0:eb2522b41db8 117 }
AjK 0:eb2522b41db8 118
AjK 0:eb2522b41db8 119 buffer_size[type] = size;
AjK 0:eb2522b41db8 120 return Ok;
AjK 0:eb2522b41db8 121 }
AjK 0:eb2522b41db8 122
AjK 0:eb2522b41db8 123 }; // namespace AjK ends