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impl calcSegmentBitLength

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rgimad 2025-04-08 00:22:17 +03:00
parent 62b3c9b8e6
commit 6d58d57ed6
1 changed files with 56 additions and 2 deletions
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58
programs/other/qrcodegen/qrcodegen.inc
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@ -85,7 +85,7 @@ qrcodegen_VERSION_MAX = 40
; TODO make this fasm macro: ; TODO make this fasm macro:
; #define qrcodegen_BUFFER_LEN_MAX qrcodegen_BUFFER_LEN_FOR_VERSION(qrcodegen_VERSION_MAX) ; #define qrcodegen_BUFFER_LEN_MAX qrcodegen_BUFFER_LEN_FOR_VERSION(qrcodegen_VERSION_MAX)
INT16_MAX = 32767
; Sentinel value for use in only some functions ; Sentinel value for use in only some functions
LENGTH_OVERFLOW = -1 LENGTH_OVERFLOW = -1
@ -102,7 +102,7 @@ PENALTY_N4 = 10
; CODE: ; CODE:
proc qrcodegen_encodeBinary uses xxx, dataAndTemp, dataLen, qrcode, ecl, minVersion, maxVersion, mask, boostEcl proc qrcodegen_encodeBinary, dataAndTemp, dataLen, qrcode, ecl, minVersion, maxVersion, mask, boostEcl
locals locals
seg qrcodegen_Segment seg qrcodegen_Segment
endl endl
@ -125,6 +125,60 @@ endp
; Returns the number of data bits needed to represent a segment
; containing the given number of characters using the given mode. Notes:
; - Returns LENGTH_OVERFLOW on failure, i.e. numChars > INT16_MAX
; or the number of needed bits exceeds INT16_MAX (i.e. 32767).
; - Otherwise, all valid results are in the range [0, INT16_MAX].
; - For byte mode, numChars measures the number of bytes, not Unicode code points.
; - For ECI mode, numChars must be 0, and the worst-case number of bits is returned.
; An actual ECI segment can have shorter data. For non-ECI modes, the result is exact.
proc calcSegmentBitLength uses edx ebx, mode, numChars
.if [numChars] > INT16_MAX
mov eax, LENGTH_OVERFLOW
jmp .ret
.endif
mov eax, [numChars]
.if [mode] = qrcodegen_Mode_NUMERIC
; eax = ceil(10/3 * n)
xor edx, edx
mov ebx, 10
mul ebx
add eax, 2
mov ebx, 3
div eax, ebx
.elseif [mode] = qrcodegen_Mode_ALPHANUMERIC
; eax = ceil(11/2 * n)
xor edx, edx
mov ebx, 11
mul eax, ebx
inc eax
mov ebx, 2
div eax, ebx
.elseif [mode] = qrcodegen_Mode_BYTE
shl eax, 3 ; *8
.elseif [mode] = qrcodegen_Mode_KANJI
xor edx, edx
mov ebx, 13
mul ebx
.elseif [mode] = qrcodegen_Mode_ECI
.if [numChars] = 0
mov eax, 3*8
.endif
.else ; Invalid argument
mov eax, LENGTH_OVERFLOW
jmp .ret
.endif
; TODO assert(result >= 0)
.if eax > INT16_MAX
mov eax, LENGTH_OVERFLOW
.endif
.ret:
ret
endp
; DATA: ; DATA: