# The proof depends on one parameter:
#   NETWORK_BUFFER_SIZE is the size of the network buffer being parsed
# The buffer size must be bounded because we must bound the number of
# iterations loops iterating over the buffer.

{
  "ENTRY": "ParseDNSReply",

################################################################
# This is the network buffer size.
# Reasonable values are size > 12 = sizeof(xDNSMessage)
  "NETWORK_BUFFER_SIZE": 40,

################################################################
# This is the size of the buffer into which the name is copied.
# Set to any positive value.
# In the source, NAME_SIZE=254 and NETWORK_BUFFER_SIZE >> NAME_SIZE
# In the proof, NAME_SIZE >= 4 required for good coverage.
  "NAME_SIZE":  "10",

################################################################
# Loop prvParseDNSReply.0:
# file lib/FreeRTOS-Plus-TCP/source/FreeRTOS_DNS.c line 915
  "PARSELOOP0": "prvParseDNSReply.0",

# M = sizeof( DNSMessage_t ) = 12
# U = sizeof( uint32_t) = 4
# Loop bound is (NETWORK_BUFFER_SIZE - M) div (U+1) + 1 tight for SIZE >= M
# Loop bound is 1 for 0 <= SIZE < M
  "PARSELOOP0_UNWIND":
    "__eval 1 if {NETWORK_BUFFER_SIZE} < 12 else ({NETWORK_BUFFER_SIZE} - 12) / 5 + 1",

################################################################
# Loop prvParseDNSReply.1:
# file lib/FreeRTOS-Plus-TCP/source/FreeRTOS_DNS.c line 989
  "PARSELOOP1": "prvParseDNSReply.1",

# A = sizeof( DNSAnswerRecord_t ) = 10
# M = sizeof( DNSMessage_t ) = 12
# U = sizeof( uint32_t) = 4
# Loop bound is (NETWORK_BUFFER_SIZE - M - A) div (A+1) + A + 1 tight
#    for SIZE >= M + A
# Loop bound is (NETWORK_BUFFER_SIZE - M) + 1 for M <= SIZE < M + A
# Loop bound is 1 for 0 <= SIZE < M
  "PARSELOOP1_UNWIND":
    "__eval 1 if {NETWORK_BUFFER_SIZE} < 12 else ({NETWORK_BUFFER_SIZE} - 11 if {NETWORK_BUFFER_SIZE} < 22 else ({NETWORK_BUFFER_SIZE} - 12 - 10) / 11 + 11)",

################################################################

  "CBMCFLAGS":
  [
    "--unwind 1",
    "--unwindset {PARSELOOP0}:{PARSELOOP0_UNWIND},{PARSELOOP1}:{PARSELOOP1_UNWIND},prvProcessDNSCache.0:5"
  ],

  "OBJS":
  [
    "$(ENTRY)_harness.goto",
    "$(FREERTOS_PLUS_TCP)/FreeRTOS_DNS.goto",
    "$(FREERTOS_PLUS_TCP)/test/FreeRTOS-Kernel/tasks.goto"
  ],

  "DEF":
  [
    "NETWORK_BUFFER_SIZE={NETWORK_BUFFER_SIZE}",
    "NAME_SIZE={NAME_SIZE}"
  ]
}